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Tangram Canada Inc.

4.8

415

9.4

95%

Mississauga, Canada

$25 USD per hour

We are a Canadian-Ukrainian team of highly professional IT specialists (software developers, designers, system administrators and Internet marketers) with more than 20 years expertise. OUR MAIN SPECIALIZATIONS: 1) WEB DEVELOPMENT & SOFTWARE DEVELOPMENT 1.1) FRONT-END: HTML, HTML5, CSS3, Bootstrap, TailwindCSS 1.2) JAVASCRIPT: JavaScript, ES6+, Typescript, Node.js, MEAN, MERN, MEVN, Angular, React.js, Vue.js, Nuxt.js, Next.js, Gatsby.js, jQuery 1.3) BACK-END 1.3.1) LAMP (Linux, Apache, MySQL, PHP) including Symfony, Laravel, Yii, Zend, CodeIgniter, CakePHP 1.3.2) Python (Python, Django, Flask, FastAPI) 1.3.3) .NET stack technologies (C#, ASP.NET, .NET Core) 1.4) OPEN SOURCE SOLUTIONS 1.4.1) E-commerce Platforms: Shopify, Magento, WooCommerce, Prestashop, OpenCart, BigCommerce, Shopware, osCommerce 1.4.2) CMS: WordPress, Drupal, Joomla, TYPO3 etc. 1.4.3) CRM: SuiteCRM, SugarCRM 2) MOBILE DEVELOPMENT 2.1) Android native development: Java, Kotlin 2.2) iOS native development: Swift, Objective-C 2.3) Cross platform development: Flutter, React Native, Ionic 3) DESIGN 3.1) Website Design (UI (User Interface), UX (User Experience) etc.) 3.2) Graphic Design (Creative Design, Digital Design, Advertisement Design etc.) 3.3) Corporate Identity (Brand Boooks, Business Cards, Logos, LetterHeads etc.) 4) INTERNET MARKETING 4.1) Social Media Marketing (Linkedin, Xing, Facebook, YouTube, Instagram etc.) 4.2) SEO (SEO Copywriting, SEO Auditing, White Hat SEO) 4.3) PPC Marketing (Google Adwords, Google Ads, Facebook Ads, YouTube Ads, Instagram Ads etc.) 4.4) Email Marketing 5) MANAGED SERVICES 5.1) 24/7 TECHNICAL SUPPORT 5.2) SYSTEM ADMINISTRATION SERVICES Our team of high qualified System Administrators have huge experience with technologies covering: - different distributions of OS Linux, Unix and MS Windows Server systems; - different types of virtualization (ProxMox, Virtuozzo, OpenVZ, KVM, XEN, VMware, Hyper-V); - VPN/DNS/IPTables/Firewalls/web servers/mail servers configuration and tuning etc.; - cloud solutions (AWS, MS Azure, Google Cloud, Alibaba Cloud, OVHcloud, DigitalOcean, Linode etc.). 6) HOSTING SERVICES provided by our hosting subdivision under trade mark "TanHost" 6.1) Cloud based solutions (e.g. configuration and technical support of Private Clouds); 6.2) Сollocation services, the providing for rent dedicated and VPS/VDS (virtual servers); 6.3) Shared Hosting; 6.4) Domain names registration services; 6.5) SSL Certificates. 7) EMBEDDED SYSTEMS 7.1) Embedded software development 7.2) Internet of Things (IoT) 7.3) Microcontrollers programming 7.4) Arduino microcontrollers programming OUR CREDO: Reputation – is above anything else! We help our customers to grow success and we grow together with our customers! We are flexible to meet our clients' needs. We make it simple...

Ethereum PHP ASP C Programming Java

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Nik

5.0

5.3

100%

Vancouver, Canada

$60 USD per hour

With 25+ years in IT, I design and build production-grade AI and voice systems that replace real human workflows—not demos. My core specialty is conversational AI over the phone: AI receptionists, appointment setters, outbound agents, and call automation built with ElevenLabs, Whisper, Twilio, LiveKit, Agora, and modern LLM stacks (OpenAI, Claude). I’ve delivered systems that answer every call, book directly into calendars, send transcripts in near-real time, and gracefully escalate to humans when needed. For structured, compliance-sensitive use cases, I also implement Dialogflow CX as a deterministic conversation layer—paired with LLMs where flexibility is required. This hybrid approach gives clients both reliability and natural speech. Beyond voice, I consult on: OpenAI API and LLM agent pipelines Automation workflows across web, mobile, and cloud Real-time systems, telephony, and event-driven architecture Earlier in my career, I led and supported large enterprise platforms and intranet migrations (Jive, SharePoint, Confluence). Today, my focus is on future-forward, human-feeling systems— vibe-coded applications: intuitive, immersive software that users don’t have to think about. If you want something that actually works in the real world—not just a chatbot—I’m happy to show live examples.

Ethereum PHP Java JavaScript Python

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Smitkumar

5.0

4.9

83%

Scarborough, Canada

$65 USD per hour

With 8+ years of experience as a Senior Software Engineer, I help businesses build scalable, reliable, and modern digital products across web, mobile, desktop, cloud, and AI-driven platforms. My background covers full-stack development, backend architecture, cloud infrastructure, API integrations, automation, and AI-powered solutions. I’ve worked with startups, agencies, and growing companies to develop production-ready systems that are fast, maintainable, and built for long-term growth. My core expertise includes: • C#, .NET / .NET Core, ASP.NET MVC, Web API • Angular, React.js, Next.js, Vue.js, TypeScript, JavaScript • SQL Server, PostgreSQL, MySQL, MongoDB, SQLite • AWS, Azure, Docker, CI/CD, Linux, Nginx, IIS • REST APIs, GraphQL, Microservices, Payment Integrations • WordPress, Magento, CMS Development • Mobile Development with React Native and Flutter • AI & Automation using OpenAI, ChatGPT, Gemini, MCP, n8n, Make.com • Blockchain & Web3 technologies including Solidity, Ethereum, Solana, Smart Contracts, DApps • Data Scraping, Automation, Dashboards, Power BI, Airtable, Google APIs I also have strong experience leading projects and collaborating with teams — from planning architecture and reviewing code to mentoring developers and delivering high-quality software on time. Recently, I’ve been working with AI agents, LLM integrations, and MCP-based workflows, helping businesses connect AI systems with real-world tools, APIs, databases, and business logic in practical and scalable ways. I focus on writing clean, maintainable code and building solutions that solve real business problems — whether it’s a SaaS platform, automation system, AI application, eCommerce platform, internal dashboard, or enterprise backend. I value clear communication, dependable delivery, and long-term professional relationships. Let’s build something great together.

Ethereum C Programming JavaScript Graphic Design System Admin

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Bahram

5.0

5.2

100%

Porters Lake, Canada

$60 USD per hour

Software Developer with 20+ years of experience. Starting with ASP and ASP .NET from 2000. Now experienced in lots of programming languages, specially open sourced softwares. Knowing about frontend, backend and databases as a full stack developer. Node.js, PHP, ASP, Python React, Bootstrap, JavaScript, jQuery, Angular, Vue Microsoft SQL Server, Mongodb, PostgreSQL, ...

Ethereum PHP C Programming JavaScript Python

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Nelson

5.0

0.1

100%

Kingston, Canada

$25 USD per hour

This is a well experienced developer and crypto analyst. I have 5+ years of experience in this field with several accomplished projects.

Ethereum PHP JavaScript Python Web Security

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How to hire a great freelance Ethereum Developer

An Ethereum developer is a blockchain engineer who designs, builds, tests, and deploys smart contracts and decentralized applications on the Ethereum network and EVM-compatible chains. Hiring an Ethereum developer gives your project access to specialists fluent in Solidity, Web3 tooling, and the security practices that protect on-chain value from day one.

What does an Ethereum developer do

Ethereum developers translate product ideas into production-ready smart contracts and the supporting infrastructure that connects them to wallets, frontends, and external data sources. They write contract code in Solidity or Vyper, deploy it to networks like Ethereum mainnet, Polygon, Arbitrum, Optimism, or Base, and integrate it with web and mobile clients using libraries such as ethers.js, web3.js, and viem.

Beyond writing code, an Ethereum smart contract developer is responsible for gas optimization, upgradeability patterns, access control, event indexing, and post-deployment monitoring. The commercial value is direct: well-architected contracts reduce transaction costs, minimize exploit risk, and make tokenomics, governance, and treasury logic actually work as intended.

Core deliverables from an Ethereum smart contract developer

The scope of work varies by project type, but a freelance Ethereum developer is typically engaged to deliver one or more of the following:

ERC-20, ERC-721, ERC-1155, and ERC-4626 token contracts with mint, burn, pause, and royalty logic

DeFi protocols including AMMs, lending markets, staking pools, vaults, and yield strategies

NFT collections with on-chain metadata, reveal mechanics, allowlists, and marketplace integrations

DAO tooling such as Governor contracts, Snapshot setups, and multisig treasury workflows with Safe

Smart contract audits, gas optimization passes, and refactors of legacy Solidity codebases

Layer 2 deployments and cross-chain bridges using Chainlink CCIP, LayerZero, or Wormhole

Web3 frontend integrations with React, Next.js, wagmi, RainbowKit, and WalletConnect

Subgraphs on The Graph for indexing on-chain events and powering dashboards

Oracle integrations with Chainlink for price feeds, VRF randomness, and automation

Tools and frameworks Ethereum developers use

Strong Ethereum engineers work fluently across a defined toolchain. Look for hands-on experience with the following:

Smart contract languages: Solidity and, less commonly, Vyper

Development frameworks: Hardhat, Foundry, and Truffle

Libraries: OpenZeppelin Contracts, Solmate, and Solady

Client libraries: ethers.js, viem, web3.js, and wagmi

Local nodes and forking: Anvil, Ganache, and Hardhat Network

Testing and fuzzing: Foundry's forge, Echidna, and Slither for static analysis

Indexing and data: The Graph, Dune Analytics, Tenderly, and Etherscan

Wallets and infrastructure: MetaMask, Safe, Alchemy, Infura, and QuickNode

Industries and use cases

Ethereum freelancers serve clients across decentralized finance, NFT and digital collectibles, gaming and metaverse, supply chain provenance, real-world asset tokenization, identity and credentialing, and DAO-governed communities. Common engagements include launching a token, building a staking or vesting contract for an existing project, deploying an NFT mint, integrating Web3 login into an existing app, or auditing a contract before mainnet release.

Startups use Ethereum developers to ship MVPs on testnets and iterate quickly. Established teams hire them for specialized work like upgrade migrations, L2 deployments, or post-incident remediation after a vulnerability is disclosed.

How to evaluate Ethereum developer candidates

The cost of a bad hire on a smart contract project is unusually high because deployed code controls real funds. Filter candidates on the following signals:

Verified mainnet deployments with transaction history visible on Etherscan

A public GitHub with Solidity repositories, test coverage, and meaningful commit history

Familiarity with common attack vectors: reentrancy, integer overflow, oracle manipulation, signature replay, and front-running

Experience with upgradeability patterns such as UUPS, Transparent Proxy, and the Diamond Standard

Evidence of audit reports they have authored or contracts they have shipped through third-party audits

Comfort writing comprehensive test suites in Foundry or Hardhat, including invariant and fuzz tests

Useful interview questions to copy and ask:

Walk me through how you would prevent reentrancy in a withdrawal function, and where the Checks-Effects-Interactions pattern can still fail.

What are the trade-offs between UUPS and Transparent proxy patterns, and when would you choose neither?

How do you approach gas optimization without sacrificing readability or security, and which optimizations actually matter at scale?

Describe a time you found a bug in your own contract during testing. How did you catch it and what did you change in your process?

Which L2 would you deploy this project on and why, considering finality, fees, and ecosystem tooling?

Why hire Ethereum developers on Freelancer.com

Freelancer.com gives you access to a global pool of blockchain engineers, from independent Solidity specialists to full-stack Web3 developers who can ship contracts, frontends, and subgraphs end to end. You can compare profiles, portfolios, on-chain work samples, and verified client reviews before committing, and clients set their own budgets and receive competitive bids matched to project scope.

Posting on Freelancer.com also gives you Milestone Payments, in-platform chat, and dispute support, which matter when the deliverable is code that will custody value. Whether you need a one-week token deployment or a multi-month DeFi build, you can hire on Freelancer.com without committing to a long-term agency contract.

Post a project on Freelancer.com today and connect with skilled Ethereum developers ready to design, deploy, and secure your smart contracts.

What are the steps to hiring a freelance Ethereum developer?

Hiring an Ethereum developer follows a straightforward process on Freelancer.com, but the quality of your outcome is set early by how clearly you define the contract logic and security expectations. The three steps below walk through writing a brief, reviewing bids, and awarding the project with confidence.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest determinant of bid quality, because Solidity engineers self-select based on whether the brief matches their experience. A vague post attracts generalists; a precise one attracts the specialists who have shipped similar contracts before. Head to the post project page to fill in the brief, scope, timeline, and budget before publishing.

State the contract type clearly: ERC-20, ERC-721, ERC-1155, staking, vesting, AMM, lending, DAO, or custom logic

Specify the target network or networks: Ethereum mainnet, Arbitrum, Optimism, Polygon, Base, or a testnet first

List required integrations such as Chainlink oracles, The Graph subgraphs, Safe multisig, or a specific frontend stack

Define security expectations: test coverage thresholds, static analysis with Slither, and whether a third-party audit will follow

Share token economics, supply schedules, fee structures, or governance parameters if applicable

Indicate the timeline, milestone breakdown, and whether you need ongoing maintenance after deployment

Step 2: Review bids from freelancers

Bids on a smart contract project are short proposals, not just price quotes. A strong Ethereum developer will reference specific patterns, ask clarifying questions about edge cases, and propose a sensible breakdown of phases. Read carefully and shortlist candidates whose understanding of the work matches the brief you wrote.

Look for proposals that name the framework they will use, such as Foundry or Hardhat, and the libraries they will build on, such as OpenZeppelin

Favor bidders who flag risks or ambiguities in your brief rather than promising everything without questions

Check that proposed timelines include time for writing tests, running fuzz or invariant tests, and a testnet deployment phase

Look for sample contracts attached or links to verified Etherscan deployments and GitHub repositories

Use Freelancer.com chat to ask each shortlisted developer how they would handle one specific edge case in your spec

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. For Ethereum work, weigh consistency of secure deployments across multiple past projects rather than a single impressive contract, because security discipline shows up in patterns over time.

Review portfolio depth: number of mainnet deployments, variety of contract types, and complexity of past work

Read written client reviews for mentions of code quality, test coverage, communication, and post-deployment support

Check star ratings, completion rate, on-time delivery rate, and the volume of completed projects

Confirm verified payment method and any displayed certifications or skill verifications on the profile

Award the project and structure the engagement using Freelancer.com's Milestone Payments, releasing funds only as testnet deployments, audits, and mainnet launches are completed to your satisfaction

How long does an Ethereum development project take?

A standard ERC-20 or simple NFT contract with tests can be delivered in a few days, while a full DeFi protocol or DAO build typically runs several weeks to a few months. Timelines stretch when audits, multi-chain deployments, or custom frontends are in scope.

What is the difference between an Ethereum developer and a blockchain developer?

A blockchain developer is a broad title covering any chain, including Bitcoin, Solana, and Cosmos. An Ethereum developer specializes in the EVM ecosystem, which means Solidity, Ethereum mainnet, and EVM-compatible Layer 2s like Arbitrum, Optimism, Polygon, and Base.

Do I need a separate auditor or can my Ethereum developer audit their own contracts?

For anything holding meaningful value, a separate auditor or audit firm is strongly recommended because reviewing your own code introduces blind spots. Many Freelancer.com developers offer peer review of contracts written by other engineers, which is a sensible step before a formal audit.

Can I hire an Ethereum developer for a one-off smart contract?

Yes. One-off engagements such as a token launch, a vesting contract, a mint contract, or a migration script are common on Freelancer.com. Scope it as a fixed-deliverable project with clear acceptance criteria and testnet verification before mainnet release.

What information should I prepare before hiring?

Have a written specification of the contract logic, token economics if relevant, target network, expected user flows, and any existing codebase or design assets. The clearer your brief, the more accurately freelancers can scope the work and propose a realistic timeline.