Freelance mobile app development jobs bhutan jobs

I'm in need of a skilled systems analyst to focus on writing, developing and enhancing a SRS for an Electronic Medical Record (EMR) system. Key experience and skills needed for this project: - Strong background in system analysis. - Proven experience in writing and developing SRS. - Great understanding of logic and authentication. - Proficient in data management and reporting skills. - Prior experience in handling EMR systems is a bonus. Post your hourly rate that you will work for this project. Placeholders bids will be removed.

I'm seeking a Laravel developer to customize existing laravel webcodes. Tasks include: 1. disable webhook code 2. analyze api code, and minimize api requests I need you to work in my timezone, I will NOT wait for days for simple tasks

...SharePoint Tools Desired: - SharePoint workflows: We are interested in integrating SharePoint workflows to systematise and visualise process flow. - SharePoint lists: The use of SharePoint lists for information storage and accessibility is also required. - PowerApps: Implementing PowerApps within our SharePoint environment for mobile-friendliness and easy customization is essential. Skills and Experience Needed: - Proven experience in SharePoint development - Understanding of SharePoint workflows, SharePoint lists, and PowerApps - Proficient in intranet and website design - Must have experience in developing and implementing document management systems and workflow automation. - Excellent communication skills to understand requirements and deliver accordingly. This...

I'm looking for a skilled chemist/materials scientist to embark on a project involving the development of silica-based polymer nanocomposites. The primary application for these nanocomposites is as coatings with a specific focus on thermal resistance. The desired method of application for these coatings is via spray coating. Therefore, familiarity with this technique is an added advantage. The ideal freelancer for this project will have a proven track record in designing and formulating coatings, and the ability to adapt and optimize the properties of the nanocomposites for enhanced thermal resistance. Look forward to collaborating with a driven and experienced professional in the field.

Looking for a reliable Android developer proficient in Java to design a new application with spec...integration into apps, as this is a vital aspect to my project. - Adding advertising capabilities to apps. Experience with different ad formats and placement strategies would be beneficial. - Redesigning and improving upon User Interface (UI) to create an optimal user experience. In-depth knowledge of Java is crucial, as it's the preferred programming language for this project. Familiarity with in-app purchases and working in offline mode would be a bonus, although not a requirement. This role would suit someone passionate, hardworking, and up-to-date with the latest industry trends and technologies. A portfolio of previous apps worked on that demonstrate these skills will be h...

...The site must be able to reliably send SMS in large quantities. This is a core requirement. - Minimalist Design: The site should have a simple and minimalist design, allowing for a user-friendly experience. - High Performance: The SMS transmission speed should be fast and accurate. Skills and Experience: - Prior experience in developing SMS websites is highly preferred. - Expertise in web development and design, specifically in creating simple and minimalist interfaces. - Knowledge of SMS gateway services would be beneficial, although not a strict requirement. Please note that while a specific SMS gateway service was not initially identified, the ability to potentially integrate with one in the future might be an advantage. However, the immediate focus is on developing the cor...

Call on whats app 07944344711 I am in the process of developing a React web application and require assistance on several key areas. The primary task at hand is to assist in the development of a GraphQL API. In addition, I need your expertise in error handling and unit testing. Key Responsibilities: - Develop a GraphQL API: The API will serve as the backbone of the application, so expertise in GraphQL is essential. - Error Handling: Implement robust error handling strategies to ensure the application is reliable and user-friendly. - Unit Testing: Develop and execute unit tests to guarantee the quality and stability of the application. Ideal Skills and Experience: - Proficient in React: The ideal candidate must be well-versed in React to contribute effectively to the web...

...course members area with my personal link. So those who click the link they will redirect to the course/members area and also they cannot visit profile section and also they cannot change email or password. Also once it login, no need to logged out, and it can log in automatically. Total 2 course and price will be $5 for now. If it’s successful then I have 100+ course to do the same. So more jobs and you will get more price. Thank you...

For this project, I'm needing a well-rounded expert proficient in both Xano and Adalo platforms. Here are the specific functionalities to be focused on: Xano: - Database setup: We aim to h...authentication: To protect user privacy and retain trustworthiness. - UI/UX: Must be user-friendly and intuitive. Adalo: - User interface design: Needs to be visually appealing and easy-to-use. - App navigation setup: To ensure a smooth user journey. - Data integration: Must ensure seamless data sharing and retrieval. Ideal freelancers are those who have proficient experience both in Xano and Adalo with prominent skills in database setup, API endpoint creation, user authentication, UI/UX, app navigation, and data integration. Your skill set should cover both the backend and fronte...

We are an Agency, in search of a proficient mobile app developer to create a cross-platform application for internal task management, similar to Google Tasks. This application will serve as a pivotal tool within our client company, facilitating seamless task assignment, tracking, and communication between manager and employees. Project Overview: We require a user-friendly mobile application that enables managers to assign tasks, monitor their progress, and receive notifications upon completion. Additionally, employees should be able to update task statuses and notify managers when tasks are finished. Key Features: User Authentication: Secure login functionality for managers and employees. Task Assignment: Managers should be able to create tasks, assign them to specif...

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Restaurant entrance QR code meal ticket / attendance management QR user type 1 restaurant owner 2 Companies surrounding the restaurant (companies that have a monthly meal contract with the restaurant) 3 company employees 4 private guests 5 Delivery of restaurant food ingredien...meal ticket at the entrance of the restaurant. When scanned in QR scan mode on the owner's phone and authenticated, Entry is possible It is also possible to manage employee attendance and departure from work. People who do not speak English but communicate in Korean so there is no problem And only those with accurate screen design planning are encouraged to apply. Mobile web version and admin page PC version There is a mobile manager version There is a push function by installing a shortcut ico...

I'm seeking an experienced web developer to bring my dynamic classified website to life. Key Features: - User Registration and Login: Implement a seamless and secure user registration and login system. - Listings and Categories: Design and incorporate a user-friendly interface for posting and structuring listings across various categories. - Search and Filters: Integrate a robust search engine with advanced filtering options for users to easily navigate and find what they're looking for. Payment Options: - Credit/Debit Card Payments: Provide a secure payment gateway for users to make transactions using their credit or debit cards. - PayPal: Integrate PayPal as a payment option, ensuring a convenient and familiar method for users. - Bank Transfer: Offer bank transfer as an alter...

We are a company specializing in the sale of hot tubs under the brand name "Multistream Hot Tubs." We are looking for a skilled freelance designer to create a logo for our company. The logo should effectively communicate the dynamic and luxurious nature of our hot tubs. Here's what our brand name means: 1. "Multistream" suggests the presence of numerous jets in the hot tub, each strategically positioned to create streams of water in different directions. This conveys a sense of dynamic and varied hydrotherapy experience. 2. Our hot tubs offer multiple streams of features, including various jets for hydrotherapy, multiple seating configurations, and different types of water features such as waterfalls or fountains. Requirements: 1. Visual Representation: Th...

Job Overview: We are seeking a skilled freelance researcher to create a comprehensive directory of therapists and autism specialists located in London. This project encompasses a wide array of therapy disciplines as well as top specialists in autism treatment for children. The ideal candidate should possess excellent research abilities, have a strong understanding of the healthcare sector, and be adept at accessing and verifying professional credentials and contact details. Responsibilities: Systematically collect and verify contact information and qualifications of therapists and autism specialists, ensuring that all data is up-to-date and accurate. Utilize a range of sources such as professional healthcare directories, medical institutions’ databases, specialized LinkedIn ...

I'm in need of a professional who is well-versed in WordPress to build a business website for me. The ideal candidate should also have experience with Search Engine Optimization. Key requirements: - Devel...user-friendly. - SEO Work: The focus is on improving search engine rankings. The candidate should be able to optimize the website effectively for search engines. Desired skills and experience: - Proven experience in WordPress website development - A strong understanding of SEO principles - Previous work experience with business websites and SEO - Good communication skills and the ability to work collaboratively Please note that I'm particularly interested in showcasing my products or services on the website, so prior experience with this aspect of website devel...

We are part of a worldwide network providing drug testing services. We have a presence in multiple countries. Our client wants us to conduct drug testing around Gifu, TAKAYAMA, Japan, 506-0012. We will reimburse you for your travel. We will train you on how to do it and provide the necessary supplies and tools. You will have to either go to the client's residence or office to collect the provided urine sample or rent a meeting room to host the session. Meeting room rental costs will be borne by us. Thereafter I will guide you on how to perform the testing hygienically and you will send us the result. We will compensate you for every test done.

As a client, I'm seeking the assistance of an experienced blockchain developer to help with the creat...features of the platform since this was not specified during our discussions. The abilities of providing liquidity pools, yield farming, lending and borrowing facilities are welcome. - I have a design and branding concept in mind, which would be provided to help maintain the aesthetics and user-interface of the platform. Preferred Skills and Experience: - Extensive experience in blockchain development, particularly on the Solana network. - A solid understanding of SPL token and decentralized finance platforms. - Strong skills in user-interface design to implement the specific design concept I have in mind. Feel free to state your experience related to this field when pl...

I'm in need of a mobile application that can assist salespeople who are selling food to restaurants. The application is to be developed for both iOS and Android, ensuring it's accessible to a wide range of users. Key Features: For this application, the primary focus should be on the implementation of a customer database. This database needs to be user-friendly and efficient, allowing salespeople to easily manage and access customer information. Offline Functionality: While I'm not entirely sure if offline functionality is required, it would be beneficial for the app to have this capability. This would ensure that the salespeople can continue to work efficiently regardless of their internet connection. Ideal Skills: - Experience in cross-platform mobile...

I need someone to create a bot that will get signals from a public telegram channel and placed an order on a centralized exchanges right away. we should be able to customise stop loss and take profit. There will be 2 startegies: 1- As soon as the signal is received, place a buy order with a take profit limit. 2- As soon as the signal is received, buy the coin and then place a short order imediately with a take profit limit. The second startegie is to capitalize on the price of coin going down.

I'm seeking a proficient Flutter app developer to assist in the customization of an existing template-based multi-vendor food delivery app. The primary tasks will involve refining the user interface and tailoring the menu categories and options to meet our specific needs. Key Responsibilities: - Implementing UI modifications: We require a fresh color scheme and branding throughout the app, as well as font and typography adjustments to enhance overall aesthetics and user experience. - Customizing menu categories: Your role will involve modifying existing menu categories and options to align with our unique requirements. Ideal Skills and Experience: - Proven experience in Flutter app development, with a portfolio showcasing similar projects. - Profic...

I'm in need of a developer to create a custom healthcare information system for managing patient records, scheduling appointments, and storing research laboratory results and patient consents. Key Features: - ...laboratory results and patient consents. This will allow for easy access and sharing of data. - Role-Based Access Control: The cloud-based system must implement role-based access control. This is crucial for ensuring that only authorized personnel can access and modify sensitive information. Ideal Skills: - Experience in developing healthcare information systems. - Proficiency in cloud-based system development. - Strong understanding of role-based access control. - Blockchain sandbox is available If you are confident in your ability to meet these requirements, pleas...

I'm seeking a seasoned Web Developer to create a comprehensive Company Website with a professional corporate design style. The website should prominently feature our Products or Services section. Key Responsibilities: - Implementing a corporate professional design - Developing an engaging and user-friendly Products or Services section Ideal candidate: - Experience in website development, particularly with corporate style websites - Strong understanding of customer-centric design - Exceptional skills in UI/UX optimization.

I'm seeking a skilled developer with expertise in React.js, PHP, and MySQL to create an e-commerce website for me. The website will require a shopping module, account module, and a cart. Key Features of the Shopping Module: - Product search and f...Product categories and subcategories - Product recommendations Account Module Functionality: - User registration and login - Account settings and profile management - Order history and tracking Cart Module Implementation: - Add to cart functionality - Quantity adjustment - Seamless checkout process I will need the full source code once the project is completed. Experience in e-commerce website development and with the technologies mentioned is a must. Prior work samples or references are highly appreciated. Looking forward to he...

I urgently need a team or an individual, ideally skilled in React and Laravel, to quickly develop a project titled "React Laravel 401". It's essential that developers understand and can implement the following functionalities: - User Authentication: The project requires a robust user authentication mechanism. - Role-based Access Control: Varying access levels for different roles is a critical component of this project. - API Integration: Proficiency in API integration is imperative to ensure seamless data exchange with other applications. - Interceptor: Though it's not specified what role the interceptor will play in this project, having a prior knowledge of interceptors (Logging, Caching, Error handling) would be advantageous. Quality of work is important, yet a s...

I need an appointments app developed. The app should be compatible with both Android and iOS devices. I want it to have features that allow users to schedule appointments. The main purpose of this app is to provide a platform for managing appointments. Ideal skills and experience for this job include: - Proficiency in Android and iOS app development - Experience with appointment scheduling systems - Understanding of user-friendly interface design - Ability to implement calendar-based functionalities

I am in need of a professional who can create a solution for our production environment. This solution will allow us to effectively gather data from multiple CNC machines. The ideal candidate will have expertise in CNC machine communication, data collection, and software development. Key Responsibilities: - Designing a solution for data communication from CNC machines to a central system - Integration of multiple CNC machines to the solution - Implementing data fetching for production output, machine status, and machine parameters Ideal Skills and Experience: - Strong knowledge of CNC machine operation and communication protocols - Focas, mtconnect

I'm looking for an expert in Power Apps to enhance my project with additional functionality. As with ...in Power Apps to enhance my project with additional functionality. As with most Power Apps endeavors, this one aims to automate processes, create a mobile app, and manage data and workflows. The project has a broad scope and I need a detail-oriented professional who can ensure everything runs smoothly. Despite skipping a few questions about the specifics, I will provide complete details once we start our discussion. Ideal Skills: - Extensive experience in Power Apps - Strong understanding of automation processes - Excellent communication skills - Attention to detail - Ability to integrate systems - Experience in mobile application development - Proficie...

Need small flutterflow app for ios and android made from some templates from the FlutterFlow Marketplace, customize, add some API and Firebase. Need developer with a proven history of working with Flutterflow and and flutter. Help with upload. Send final source. Payment will be made in milestones. Budget is up to $200. Key Requirements: - Develop app for iOS, Android, and Web. - Use of Flutterflow for app creation. - Must have knowledge and experience in multi-platform app development. Desired Skills: - Proficiency in Flutterflow and flutter - Experience in multi-platform app development - Knowledge of user authentication, api's, firebase Please note, flexibility and adaptability will be required as the project progresses, thank yo...

?Hello there :) We're seeking a Freelance Sales & Business Development Specialist speaking German. If you have passion and experience in SaaS and Tech industries, and the expertise to navigate the German market, we want to hear from you. As a sales agency, we help SaaS and tech companies sell around Europe cooperating with local Sales Specialists, freelancers. Based on our experience, that is the most effective approach, as local Sales Specialists grasp the culture, the people, and the language. So, currently we're seeking for a Sales Specialist for a Media Innovation Company, willing to handle the entire sales cycle. .target market: Germany .target audience: marketers & brand managers .required skills: - You speak native German - You have experience i...

I need a simple form that will look good on a small screen iPhone and also a big screen iPad. The form will collect NAME EMAIL CITY PHONE NUMBER phone number will be a formatted 10 digit max, and email will need validation for properly formatted. This will take the data and post it to our existing base and will then revert form back to a page that says success, and then auto redirect to the form page. The form page will look neat and clean and also contain a couple lines of text and our logo. You will use the existing config file to connect to our base, instead of creating a new one. This project needs completed today and should only take an hour to complete. This is to be written in php 8.2 and connected to sql dbase. You will be paid $30 when it is complete and verified to be wo...

I'm searching for a proficient SolidWorks modeler to assist in the development of an experimental setup primarily used for research purposes. Key components to be incorporated include: • Sensors This project necessitates a deep understanding of how sensors function, especially with regards to normal setup. Your role will largely involve integrating these sensors into the model to ensure maximum functionality and efficiency. Ideal Skills and Experience: • Proficiency in SolidWorks is a must • Deep understanding of sensor integration • Background in research-oriented projects • Familiarity with normal setup sensor functionality Your input and expertise will contribute to the success of this integral research tool. I'm looking forward to seeing ...

I am in need of an experienced full stack developer who is well-versed in .NET and Angular to assist with the backend and frontend development of my project. Essential Tasks: - Involvement in both backend and frontend development processes - Providing valuable insights during project reviews Key Skills: - Strong competence in .NET and Angular - Proven experience in full stack development - A strong grasp of cloud technologies is advantageous - Excellent communication skills, as understanding and following project requirements are crucial Project Timeline: - There is no strict time frame for completion of this project. We value quality deliverability and careful attention to detail above speed. Ideally, you have a portfolio of previous projects to demonstrate y...

If you are new freelancer who wants to have their first job , We're seeking talented individuals, whether you're a student of architecture or a certified architect. Requirements: Passion for architecture. Creativity and innovation. Attention to detail. Proficiency in design software. Strong communication ...wants to have their first job , We're seeking talented individuals, whether you're a student of architecture or a certified architect. Requirements: Passion for architecture. Creativity and innovation. Attention to detail. Proficiency in design software. Strong communication skills. This opportunity is perfect for gaining experience, building your portfolio, and establishing yourself in the freelance community. If you're ready to dive in, send us your...

I'm seeking a proficient app developer to create a business app primarily for Android maybe iOS. This app should be primarily centered around the ability to post "whitelist sessions" to car parking enforcement software via JSON. Key App Features: - Posting whitelist sessions to car park enforcement software - Backlogging user entered information if posting fails due to internet connection or any other reason - Ability to customise user interface for each client - Ability to specify how long each whitelist session is i.e. 2 hours, 3 hours, 1 day etc etc. Given the technical nature of the app, the potential freelancer should possess the following skills and experience: - Proficiency in Android app development - Familiarity w...

I'm aiming to build an enhanced e-learning platform that integrates artificial intelligence at its core. My vision is focused on three special features: Gamification, interactive quizzes, and progress tracking capabilities. This would effectively make learning fun, engaging, and easily monitored. The core functionalities I require include virtual tutors, natural language processing for student-teacher interaction, sophisticated robotics, and an advanced learning process. All these aspects and more should contribute towards fostering optimal communication and facilitating superior understanding and learning. I'm at the helm of an exciting Artificial Intelligence technology startup, and we're keen to grab a visionary investor who's aware of the AI landscape. Our primary ...

I'm seeking a skilled web developer to create an appealing and informative website for my Exports and Imports business. Key Points: - The site needs to encompass both my company's history and background, and client testimonials. - I'm looking for a sleek, aesthetic, and innovative UI that will attract and retain visitors. - Essential features include a contact form and integration with social media platforms. The ideal candidate should have: - Proven experience in designing and developing information-rich websites, particularly for companies dealing with imports and exports. - Proficiency in creating user-friendly, aesthetically pleasing interfaces. - Strong skills in implementing contact forms and integrating websites with social media. This project, if executed well, ...

I'm seeking an expert in Android development, specifically experienced with maintaining and troubleshooting Android 4.4 (KitKat) applications. The application requires username and password login functionality. Ideal Skills and Experience: - Extensive Android Development - Detailed knowledge of Android 4.4 (KitKat) - Experience in implementing login functionality Please place a bid if you have the necessary skills and experiences. Provide evidence of previous Android 4.4 application work, if available.

I'm looking for a skilled freelancer who can help in optimizing my website for both desktop and mobile, implementing SEO strategies to increase traffic, design posts and managing social media marketing campaigns on Facebook, Instagram, Snapchat, TikTok, and WhatsApp. Key Responsibilities: - Ensure the website is mobile-friendly and optimized for desktop, enhancing user experience across all platforms. - Implement SEO strategies to increase website traffic and improve search engine ranking. - Develop design posts and execute social media marketing campaigns on Facebook, Instagram, Snapchat, TikTok, and WhatsApp. Website Optimization: Ensure full mobile responsiveness and SEO optimization for enhanced user experience and search engine visibility. Social Media Mar...

I'm looking for a dedicated, reliable, and experienced remote freelance assistant to join my team on a full-time basis. Your main responsibilities will encompass basic administrative tasks, web design, and digital marketing, writing contents with ChatGpt and editing manually. (Hindi knowledge is must) The key areas where I need assistance include: - **Social Media Management**: You will be responsible for managing our social media accounts. This will involve creating engaging posts, interacting with customers, and managing our social media presence. - **Content Creation**: You will also be tasked with creating content for our various platforms. This includes written content, images, and potentially video content. - **SEO Optimization**: Your role will also encompass working o...

I'm looking to build an e-commerce platform mainly targeting professionals. The platform should be designed with a focus on delivering a se...e-commerce platform should primarily support bank transfers as the payment method. This is crucial as most of our transactions will be carried out via bank transfers. - Given the target audience, the design and user interface should be tailored to a professional audience. The overall look should be clean, sleek, and easy to navigate. Ideal Skills and Experience: - Proficient in e-commerce website development. - Experience in integrating and customizing payment gateways, especially bank transfer systems. - A sharp eye for design, particularly in creating a professional and user-friendly interface. - Prior work targeting professional audie...

...Leaderboards: This requires creating a competitive environment for players where they can compare their scores and achievements with other players. Ideally, the leaderboard should be dynamic, updating in real-time, and easy for players to understand and navigate. Ideal Skills/Experience: - Laravel PHP Framework: Proficient skills and experience in Laravel development will be essential for this project. - Game Design: Experience in engaging game development, particularly in creating colour prediction games, is agreed. - Cartoon-style Graphic Design: I'm looking for someone experienced in developing playful, cartoon-style graphics that can bring the game to life. - Leaderboard Implementation: Proven experience in developing interactive leaderboards in gaming applicati...

I have an app that I bought on a website. I would like to get it working and fit the resquirements I have already designed.

I'm searching for a proficient developer who can create app like Too good to go UI & UX

I'm seeking an experienced C++ developer with a st...background in using the OpenGL library for a 2D game project. With a lack of indication for a defined platform or specific game goal, I welcome your expertise and advice on how we can best navigate these aspects to create an engaging 2D game. Similarly, I've not settled on a visual style or theme, as I'm keen to see your ideas come to life. Key requirements: - Extensive prior experience in C++ game development. - Solid proficiency with OpenGL. - Ability to creatively interpret and fill gaps in project scope. You will have the creative freedom to propose ideas for the best platform, objective, visual style, and theme for this game. Your portfolio showcasing your previous 2D game projects will be highly beneficial ...

I am seeking a skilled Unreal Engine Developer to create a state-of-the-art, interactive and engaging virtual mall. My vision involves a modern and futuristic design aesthetic. This virtual reality project will primarily function to provide a unique and compelling shopping experience. Here are a few competencies I’ll require from you: - Expertise in Unreal Engine and virtual world building - Proficiency in designing and implementing immersive VR experiences - Ability to create an extensive virtual shopping environment, including, but not limited to interactive stores, VR shopping carts, and engaging 3D storefronts. Essentially, I am looking for an individual who can bring a cutting-edge shopping experience to life through expert design and functionality. If you possess the skills...

I am seeking an experienced SEO specialist to assist with the creation of 100 high-quality backlinks from authoritative sites within the technology industry. This task aims to improve my search engine rankings, therefore candidates with verifiable results in boosting SEO rankings will be preferred. The project specifics include: - Building 100 backlinks on tech-related high-authority sites - Linking to my websites pages. Candidates should possess: - Proven SEO and backlink building skills - Knowledge and experience in the technology industry - Ability to identify and leverage high-authority tech-related sites - Excellent content creation and placement strategies A successful completion of this task could lead to possible long-term collaboration.

I'm currently in pursuit o...programmer familiar with game development. The project's key focus is on developing an adventure type game with a comprehensive structure of multiple levels. Key Features Required: - You will need to design diverse environments for each level. Skills & Experience: - Strong command of Python - Prior experience in game development, preferably adventure games. - Creativity in game design. - A keen understanding of level design and progression. Your innovative insight would be highly beneficial to the creation of a captivating and challenging game. Plus, you should be able to meet deadlines faithfully and have a knack for detail. I look forward to working collaboratively with you, sharing ideas, and pushing the boundaries of what i...

I'm seeking a talented Python developer to create an action game for a first-year project. Key requirements: - Experience in game development, particularly action games - Proficient in Python coding - Ability to create multilevel gaming structure Your task would involve coding the game platform along with integrating various levels throughout the gameplay. Knowledge and experience in developing action games will be considered a huge plus. Only apply if you feel confident about tackling this challenge within the time frame and can ensure quality code.

I need to develop a full-fledged jewelry auction marketplace that will include the following elements: - User Accounts: The platform should support user accounts for both buyers and sellers. - Auction Features: The marketplace should include a robust bidding system, as well as a user-friendly item search and filtering functionality. - Payment Gateway: The platform should have a secure and reliable payment gateway integrated into it. - User Rating and Review System: An essential feature that will help to build trust among the users. Ideal skills and experience for this job include: - Proficiency in developing marketplace platforms - Strong experience with payment gateways integration - Expertise in implementing auction systems - Past experience in building user rating and review systems ...