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Sijan A.

5.0

5.8

96%

Riverwood, Australia

$25 USD per hour

I am an expert in - AWS including autoscaling, high availability, data transfer - Blockchain infrastructure setup - Moodle hosting, management, administration - Cloud infrastructure - Install and configure Elasticsearch, Kibana, Logstash, Beats, APM - Linux administration (Ubuntu, Redhat, CentOS, SUSE, Kali, Debian, etc.) - Automation using Ansible - MySQL, MySQL Cluster administration, migration, backup/restore - PostgreSQL administration, migration, backup/restore - Cryptography - SSL, certificate, public-key infrastructure, cryptography - Oodo ERP, NextCloud - cPanel, Plesk - Optimise WordPress performance, Joomla, Drupal - Acronis, Splunk, security - FreeRadius (RADIUS) - Ethical hacking And many other stuff in technology. Please reach out to me if you need any help with regard to information technology issues.

Ethereum PHP System Admin Linux Excel

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24Hr Agency

4.2

6.4

88%

Homebush, Australia

$50 USD per hour

Hey there. I am Rolesh, a software developer and I have a team with 8 years of experience in software development. Specifically, we have extensive experience in Web, Mobile, AI, game development. 1. Game Development Unity, Unreal Engine, Construct (WebGL, Mobile, PC Game) Multiplayer, PvP Lua, Godot, Phaser, Minecraft, Java Telegram mini game, trading bot Cinematic, Sandbox In app purchase, Playfab, photon Augmented reality, virtual reality, Metaverse Vuforia, ARCore/Kit, Zapworks, 8th wall Kinetic, Oculus 2. Mobile app development Proficient in developing cross-platform mobile applications using React Native and Flutter. 3. Web Development React.js, Three.js, Node.js, Angular.js, MongoDB Wordpress, eCommerce, Wix, Magento, Shopify Laravel, MySQL, GoLang, Django Admin dashboard 4. Artificial Intelligence, IOT Python, Django AI, ML, API Integration, OpenCV, Tensorflow 5. Blockchain Web3, Cryptocurrency, Solana, Solidity, Metatrader 6. Design UI/UX design Logo Design and Animator

Ethereum PHP Java JavaScript XML

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Phantom Interactive

5.0

5.5

92%

Sydney, Australia

$75 USD per hour

Phantom Interactive provides DevOps and AWS assistance flow utilizing industry proven tools to customers who needs to automate and scale their services. We can assist with release management, infrastructure management, build and deploy pipelines, containerization and orchestration. From managing a development to designing and building infrastructure and CICD pipelines, we can make the difference in a successful project or not. Core skills and capability in our arsenal: - AWS infrastructure and services - CICD automation - Agile coaching, DevOps practices - Containerized workloads, EKS, ECS, native K8s and Docker workload - Blockchain and Crypto expertise, automated trading and analysis - AI implementations, ChatGPT modelling

Ethereum PHP JavaScript Python Website Design

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Joey Z.

5.0

0.6

100%

Melbourne, Australia

$20 USD per hour

I am using nodejs/react/AWS for more than 7 year. I manage two open source projects with React/MongoDB/Nodejs you can find out at: 1. Mongo Runner https://marketplace.visualstudio.com/items?itemName=JoeyYi- Zhao.mongo-runner 2, dbKoda https://www.dbkoda.com/

Ethereum Java JavaScript iPhone Android

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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.