Protofire as great enthusiasts and active contributors to the open-source blockchain communities, we help builders and providers of decentralized infrastructure, protocols, and applications, bootstrap the demand and supply sides of their markets and accelerate mass adoption.

We help startups with protocol & smart contract engineering, high-performance trusted data feeds (oracles), and awesome developer tools (SDKs/APIs).

Since we started in 2016 we’ve had a chance to contribute to the development of many top projects in the blockchain ecosystem, including Maker, Chainlink, Tezos, Gnosis, Kyber Network, The Graph, Filecoin, Synthetix, Avalanche, and more. Apart from that, we are running one of the biggest indexer nodes in the Graph Network, participating as bridge relayers and validators helping projects and networks to further decentralize their infrastructure.

We are now looking to hire a cross-disciplinary team to help Protofire scale. As such, we’re looking for a Solidity Developer who’s had extensive experience writing, testing, deploying, and auditing smart contract code and who is up to date on the current developments in Solidity.

Besides knowing Solidity, we’d love to hear your informed opinion on the latest developer tooling, adhere to industry best practices, and follow the latest vulnerabilities and hacks in the Ethereum smart contract space with interest.

How you will make an impact:

• Produce high quality, performant, and well-tested Solidity code
• You’ll be working with advanced smart contracts, working on new features for the protocols, and creating new technical DeFi primitives
• Conducting technical due diligence and understanding dynamics/tradeoffs between different blockchain protocols
• Perform smart contract audits and identify vulnerabilities
• Work closely with the product team towards building out a DeFi application Integrating front ends with smart contract code
• Achieve comprehensive unit and integration test coverage
• Design and ideation of new functionality

What you need to succeed:

• 5+ years of experience in another programming stack or language
• 1+ years of Solidity smart contract development experience
• Understanding of Javascript Ethereum SDK’s (web3.js, ethers.js)
• Experience deploying Dapps or smart contracts on to Ethereum
• Smart contract dev tools/frameworks - hardhat and truffle
• Hands-on experience conducting smart contract audits, including identifying vulnerabilities, documenting findings, and providing recommendations for remediation.
• Familiarity with common attack vectors and auditing methodologies (e.g. reentrancy, front-running, integer overflows, gas optimization, etc.)
• CI/CD setup experience
• Deep understanding of the Ethereum Virtual Machine and the broad decentralized finance ecosystem
• Problem-solving attitude, ability to act autonomously, participate in discussions, and actively propose solutions.
• Excellent communication skills - You know how to work in teams, give and receive feedback, identify bottlenecks.
• A desire to keep up with blockchain technology trends and a real interest in decentralization

Apply Now:

Apply Now:

We are seeking a talented Middle / Senior Ethereum Developer with a deep understanding of financial markets and experience in trading to join our client team.

As an Ethereum Developer, you will be responsible for developing and maintaining smart contracts and decentralized applications (DApps) on the Ethereum blockchain. Your expertise in financial markets, combined with your knowledge of key protocols such as Pendle, CurveFi, 1inch, AaveV3, Morpho, will be instrumental in creating innovative solutions for their platform.

• Design, develop, and deploy smart contracts and DApps on the Ethereum blockchain.

• Collaborate with cross-functional teams to gather requirements and implement efficient and secure solutions.

• Stay up-to-date with the latest developments in Ethereum and decentralized finance (DeFi) to leverage cutting-edge technologies and protocols.

• Integrate and interact with various DeFi protocols such as Pendle, CurveFi, 1inch, AaveV3, Morpho

• Write clean, well-documented, and efficient code to ensure the reliability and scalability of our applications.

• Conduct thorough testing and debugging to identify and resolve any issues or vulnerabilities.

• Optimize smart contracts and DApps for gas efficiency and cost-effectiveness.

• Continuously monitor and improve the performance and security of the Ethereum-based systems.

• Provide technical guidance and mentorship to junior developers when required.

Requirements:

• Strong proficiency in Solidity programming language and experience with Ethereum development tools (Foundry, Hardhat etc).

• In-depth knowledge of financial markets, trading strategies, and investment principles.

• Familiarity with key DeFi protocols such as Pendle, CurveFi, 1inch, AaveV3, Morpho.

• Experience in designing and implementing secure smart contracts and DApps.

• Solid understanding of blockchain fundamentals and Ethereum’s architecture.

• Knowledge of other blockchain platforms (Ethereum, Base etc.).

• Proficient in using Git for version control and collaborative development.

• Ability to work independently and in a team environment, collaborating effectively with other developers, designers, and stakeholders.

• Strong problem-solving skills and attention to detail.

• Excellent communication and documentation skills.

Preferred Qualifications:

• Knowledge of privacy-preserving technics & modern cryptography

• Experience of using protocols for applied cryptography (zkSNARK, zkSTARK, etc)

• Familiarity with automated testing frameworks for smart contracts

• Contributions to open-source projects in the Ethereum ecosystem

  Interview stages:

• Interview with a recruiter

• Interview with a Tech lead

• Interview with a CTO on general technical topics

• Сulture fit interview

We’ll review your CV and everything you have sent us within five working days. If your background meets our needs — we’ll set up a call to get to know each other better. Otherwise, we aren’t quite ready for you at this moment. But no worries — our journey has just started, and we’d love to stay in touch as our team grows and more opportunities emerge. We wish you the best of luck with your aspiration.

Apply Now:

Serokell is a fast-growing, fully remote software development company that works on innovative solutions for complex problems. We’re packed full of adventurous, curious, and inclusive folks who want to build cutting-edge software with modern technologies like functional programming.

This position is open now with a July start. This is a project-based hire with the option to extend if it is a good match. Submit your CV and we’ll reach out promptly.

We’re seeking a middle to senior level Solidity Developer to join a team of fierce and fun Serokellers.

Hiring Process Overview: We invite candidates to the HR screening as the first step. Next, we conduct a technical interview with those whose profiles align with our requirements. Successful candidates will receive an offer.

Requirements:

• Fluency with Ethereum or another EVM-based blockchain ecosystem
• 2+ years in software development
• 1+ years experience writing, testing, and deploying Solidity contracts
• Hands-on experience with Hardhat, Foundry, Truffle, or Remix for development, testing, and debugging, including transaction submission, data retrieval, and key management
• Understanding of security issues and best practices for Ethereum and De-Fi applications
• Knowledge of popular token standards such as ERC-20, ERC-721, and ERC-1155
• Experience developing and integrating decentralized applications, both backend and frontend
• Basic understanding of cryptography primitives: public/private keys, signing, encryption, hashing
• Knowledge of fundamental algorithms and data structures like hash tables, binary search trees, DFS, quicksort
• Strong coding practices, including clean code structure, use of git, pull requests, and code review
• Fluent English, strong communication and collaboration skills
• Comfortable with daily stand-ups and asynchronous updates
• Self-driven, proactive, teamwork-oriented, curious and inclusive mindset
• Full-time commitment, around 140–160 hours per month
• Comfortable overlapping with team time zones from UTC 0 to UTC -8

It will be a significant plus if you have:

• Knowledge of TypeScript, Haskell, Rust, or OCaml
• Experience conducting security audits and identifying vulnerabilities
• Understanding of computer networks, HTTP, TCP/IP stack, and data synchronization models used in modern service APIs
• Familiarity with build/deploy automation tools and CI/CD systems such as Docker, Nix, Kubernetes

Responsibilities:

• Create and implement secure and efficient Solidity contracts, ensuring scalability, reliability, and maintainability
• Integrate contracts with EVM blockchain networks, often involving backend or frontend work
• Review and audit code
• Develop and execute unit tests, integration tests, and end-to-end tests
• Write detailed documentation for code, including design specs, user guides, and API documentation
• Stay updated on the latest developments in Solidity, Ethereum, and EVM-related technologies, cryptographic methods, and relevant programming languages
• Optimize code performance and gas efficiency
• Implement and enforce security best practices to protect contracts from common vulnerabilities
• Provide ongoing support and maintenance for deployed applications, addressing user-reported issues and bugs

We offer:

• Competitive salary.
• Engaging international projects.
• Participation in leading global conferences.
• International and multicultural teams.
• Fully remote work with flexible hours.
• Ability to take time off as needed.
• Investment in career and professional growth, with potential for wage increases.
• Mentoring and training programs.
• Opportunity to contribute to a leading functional programming blog.
• Therapy sessions for well-being support.

By joining Serokell, you’ll become part of a warm community of ingenious engineers, computer scientists, designers, marketing experts, and other inventive minds. You’ll work on ambitious projects building the next generation of computer software, explore creative initiatives unhindered by bureaucracy, and enjoy our vibrant Slack channels—ranging from #music to #philosophyandtears (did we mention the massive custom emoji set?).