About CoW DAO

CoW DAO is on a mission to protect Ethereum users from the dangers of DeFi. It does this by supporting the development of CoW Protocol, CoW Swap, MEV Blocker, and CoW AMM, and by funding values-aligned projects through the CoW Grants Program.

CoW Protocol is the second-largest DEX aggregator by monthly volume and the first-largest intents-based exchange. MEV Blocker is currently involved in ~4% of all Ethereum transactions, making it the category leader. CoW AMM is the only live AMM that protects LPs from LVR (loss-versus rebalancing).

As a member of CoW DAO’s core team, you will have the opportunity to shape these essential products, and contribute to the Ethereum ecosystem more broadly.

About the Role

Location: We are a fully remote team, and although we hire almost globally, there is a preference for this role to be based in Europe or remote +/- 4 hours CEST time

Please note we’re not hiring from the US, Australia, or New Zealand

Position: Full-time contractor

We’re looking for an experienced Backend Team Lead who will manage and guide our engineering team while also being highly technical. This person will help resolve problems, offer mentorship, and ensure the team delivers clean, maintainable code while avoiding over-complication. You’ll work closely with our Tech Lead, collaborating on both high-level technical decisions and hands-on execution to drive the team’s success.

This position is a mix of technical expertise and people management—ensuring that the team has everything they need to succeed, both technically and personally.

What you will do

• Lead, support, and mentor the backend team: Guide team members in developing their technical skills, improving performance, and overcoming challenges while providing mentorship, feedback, and opportunities for career growth
• Encourage clean and simple solutions: Foster a development culture that prioritizes simplicity, efficiency, and streamlined workflows to enhance productivity and maintainability
• Code reviews and technical guidance: Perform code reviews, provide constructive feedback, and ensure that the team’s code adheres to best practices and high-quality standards
• Work closely with the Tech Lead: Collaborate closely with the Tech Lead to support the team in implementing solutions, overcoming obstacles, and ensuring smooth development processes
• Problem-solving: Identify roadblocks or inefficiencies in the team’s processes and help resolve them in a way that aligns with CoW’s long-term goals
• Collaborate with cross-functional teams: Work closely with product, research, and other engineering teams to ensure smooth delivery of features and high-quality results

Our Tech Stack

• Backend Code: Rust, Tokio, Cargo, Git (https://github.com/cowprotocol/services)
• Infrastructure: Pulumi, AWS, Docker, Kubernetes, Grafana, Prometheus, Elasticsearch, Flux
• Other codebases: Typescript, Python, Solidity

Who you are

• Technical expertise: You have experience in backend development (languages such as Rust, Go, Python, etc.) and building distributed systems. While Web3 experience is a plus, it’s not a requirement.
• People-oriented leader: You have experience leading teams, providing mentorship, and fostering a growth-oriented environment. You know how to motivate people, resolve conflicts, and build trust within a team
• Tech-Savvy Leader: You can step in and help with complex technical challenges, but your main focus is on the people and processes
• Simplifying Solutions: You care about and understand the importance of keeping things simple and ensuring that the team follows best development practices
• You work well with others: You have a collaborative mindset and can work with both technical and non-technical team members and ensure everyone is aligned with the team’s goals
• Code quality: You are experienced in code reviews and are passionate about helping team members improve through constructive feedback
• Remote team leadership experience: As a remote-first company, we need a Team Lead with a strong track record of managing fully remote teams, fostering collaboration, and maintaining high engagement and productivity across different time zones
• Excited about web3: While you don’t need prior web3 experience, you’re eager to explore the space, especially with EVM chains, and learn more about DeFi and blockchain technologies

What we can offer you

• Flexible work environment: Join our hub in Lisbon or work remotely
• Token plan: Have a stake in our mission and shape the future of CoW DAO
• Periodic gatherings: Enjoy opportunities to connect with the rest of the team through regular trips
• Conference allocation: Stay up-to-date with ecosystem advancements using our conference budget
• Learning budget: Use our learning budget to support your higher ambitions
• Hardware budget: Take advantage of a hardware budget for acquiring necessary equipment
• Make an impact: You are joining a startup where you can make a huge difference. Your work matters!
• Flat hierarchies mean fewer processes and bureaucracy - see more of your ideas come to life!
• Flexible work and vacation times: Prioritize work-life balance through our robust flexible work policy and vacation allowance
• Growth: If you’re someone who loves taking the initiative and getting things done, CoW offers lots of opportunities for your individual growth

Referral Program

Earn 6.000 USDC or USD with the refer-to-earn program. More details here.

Culture

Life within the CoW Protocol is an incredible adventure! We take pride in our collaborative approach, embracing autonomy and fostering a culture of big thinking and continuous growth. We value impact, ownership, simplicity, and team spirit. Plus, we’re all about feedback, coming together, and enjoying the journey along the way!

At CoW Protocol, we strive to create a space where everyone feels included and empowered. We believe that our products and services benefit from our diverse backgrounds and experiences. All qualified applicants are considered for positions regardless of race, ethnic origin, age, religion or belief, marital status, gender identification, sexual orientation, or physical ability.

Molecule is at the heart of the Decentralized Science (DeSci) movement where biotech and blockchain meet to democratize scientific research, earning recognition and support from key figures in the web3 world, including Vitalik Buterin, Balaji, and Juan Benet. We're known for creating VitaDAO, the first and largest biotech DAO with more than $4m in funding deployed, bio.xyz, a vital hub supporting and building biotech DAOs, the IP-NFT, a protocol bringing rights to IP and R&D data on-chain, and IPTs, ERC-20 tokens minted from IP-NFTs to allow token holders to construct and cultivate valuable IP. We’ve also recently launched launchpad, a platform to launch, discover, and fund the best projects in DeSci.

Over the past 24 months, we have raised $20+ million to build the future of decentralized biotech. Join us and contribute to a future where scientific discovery is driven by web3.

About Us

BIO.xyz is at the forefront of the Decentralized Science (DeSci) revolution. We are building the next-generation financial layer to accelerate biotech innovation by decentralizing funding, coordination, and governance of scientific IP. Our mission is to empower researchers, universities, and companies worldwide to commercialize the best science faster through blockchain technology.

With our protocol, BIO.xyz enables funding, development, and governance of tokenized scientific intellectual property (IP), fostering a thriving ecosystem of biotech DAOs and IP assets. Join us to reshape the future of science and innovation!

Your Role

At BIO.xyz, we are building the future of decentralized science (DeSci). Our platform connects autonomous agents to cutting-edge labs and smart contract-based treasuries, enabling researchers and agents to collaborate, innovate, and push the boundaries of scientific discovery. We are looking for a passionate Full Stack Developer to bring this vision to life.

What You'll Be Doing

• Platform Development: Design and build scalable, modular front-end and back-end systems for the Bio Protocol platform.

• Web Application: Create intuitive UIs for researchers and agents to submit tasks, manage funding, and view experiment outcomes.

• Blockchain Integration: Develop and integrate Ethereum smart contracts (Layer 1 or Layer 2) into the platform for $BIO token transactions, staking, and rewards.

• API Layer: Build RESTful or GraphQL APIs to connect the front-end interface with agent harnesses and external lab resources.

• Database Management: Implement decentralized and traditional databases to store metadata, reputation scores, and task logs.

• Security: Ensure all platform components adhere to the highest security standards, including encryption, authentication, and transaction safety.

What We’re Looking For

• 3+ years in fullstack development

• Proven experience with blockchain technology (Solidity, Hardhat, or similar

• Proficiency in JavaScript/TypeScript, Node.js, React.js/Vue.js, and Python

• Experience with database systems like MongoDB, PostgreSQL, or IPFS

• Knowledge of smart contract development and integration (e.g., ERC-20, staking mechanisms)

• Understanding of Ethereum Layer 2 solutions (Polygon, Optimism, Arbitrum)

• Enthusiasm for decentralized systems, DeSci, and innovation in research

• Experience in integrating AI/ML models with web applications preferred

• Contribution to open-source projects in blockchain or scientific domains is a big plus

Why Join Us?

At BIO.xyz, you’ll be part of an innovative, mission-driven startup that’s disrupting the world of decentralized science. If you’re passionate about pushing boundaries and creating real-world impact, this is your opportunity to shape the future of research and innovation.

Here, you’ll work alongside a skilled, fast-paced team that thrives on creativity, collaboration, and bold ideas. You’ll be challenged, inspired, and empowered to bring your best work every day.

• HODL: You’re not just taking a job — you’re joining a movement. Every project you contribute to directly impacts the future of science and technology.

• WAGMI: We reward most full time positions with token equity and give you the opportunity to co-author future DeSci standards.

• Alpha: In our young, fast growing team, your voice matters. You’ll have the chance to shape not only your future but also the future of science research and innovation.

If you’re ready to take on big challenges, work with brilliant minds, and create something that matters, LFG - BIO.xyz is the right place for you!

We are an equal opportunity employer. We are committed to equality and weaving a community that values diverse perspectives and experiences and are actively seeking a diverse pool of applicants. All employment decisions are made without regard to race, colour, national origin, ancestry, sex, gender, gender identity or expression, sexual orientation, age, genetic information, religion, disability, medical condition, pregnancy, marital status, family status, veteran status, or any other characteristic protected by law.

Apply Now:

What we’re looking for

StableUnitDAO is looking for a lead solidity architect for a complex DeFi protocol (not NFT)

Requirements

• DeFi solidity contracts deployed on mainnet in the last 12 months
• Knowledge of OZ libs and modern DeFi primitives
• You know system design of DeFi protocols, CDP, lending etc
• Experience with modern DeFi best practices

You must have prior experience with at least one of

• Projects with simultaneous multichain
• Projects with mission critical oracle
• Yield aggregators/optimizers
• CDP/Algo stablecoins
• Lending protocols

Detailed explanation of the protocol.

In this project you will work side by side with an architect who is ex 1inch, facebook, amazon, prizewinner of ethNY (award from Binance labs, Wyre, Matic), ethBoston (JPMorgan), ethDenver (MakerDao, Chainlink), ethLison (Gnosis), cs-national team, math degree, wrote multiple contracts with $1.1B in volume. The project itself is a winner of multe grants including Arbitrum security grant.

The protocol is 100% owned by a DAO, members of which are accomplished investors and DeFi builders, such as founders and early employees from 1inch, lobsterDAO, GearBox, PowerPool, Zerion, ZeroPool, STFX. Advisors and early investors of Binance, Matic, Bittensor, Trustwallet and others. We’re open for all formats of work, full/part-time, project-based or outstaff.

How to apply

Self-check: For some inexplicable reasons some folks lie about their experience, but is just a waste of our and your time. Be sure you know all main topics of “mastering ethereum”, read and actually understand solidity/opcode/evm specs, and can easily solve any task from https://ethernaut.openzeppelin.com.

If you are a good match:

1. Send us 2 addresses of mainnet smart-contacts you developed that you are most proud of.
2. We would schedule a single 30m tech interview.
3. After interview, we are immediately ready to sign the paid contract for the test period/project.

For any questions https://t.me/elpinguinofrio

Solidity Labs is seeking a seasoned Software Engineer with a minimum of 5 years of hands-on experience. A Bachelor’s degree in Computer Science is a plus, but not a requirement. We provide a unique opportunity to learn and work with a world-class team on Solidity Smart Contracts. This role will equip you with valuable skills in this emerging field, including smart contract security, architecture, and contributing to bleeding edge open source projects across all industry verticals.

Key Responsibilities

• Collaborate across different teams to develop, test, and deploy smart contract systems.
• Participate in system architecture, protocol design, and decision-making to ensure security and minimize attack surface.
• Define and discover requirements for projects, thinking through edge cases and downstream effects of system changes.
• Stay updated with emerging technologies in the blockchain space and continuously enhance your knowledge.
• Work on cutting edge cross-chain, DeFi, and L2 platforms.
• Formally verify newly built systems.
• Ensure code quality and perform code reviews.

Qualifications

• 5+ years of professional experience in software engineering.
• Proficiency in modern programming languages such as Rust, Solidity, Go, or Python.
• Strong analytical and problem-solving skills.
• Ability to think through edge cases and identify architectural issues.
• A security-oriented mindset, thinking both as an attacker and a defender.
• Excellent communication skills and the ability to work well in a team.

What We Offer

• Competitive salary and comprehensive benefits package.
• The opportunity to work with a world-class engineering team.
• A diverse and inclusive work environment.
• Flexible working arrangements with the possibility for partial remote work.
• The chance to work on meaningful projects at the forefront of blockchain technology.
• An in-person workplace to up-skill as fast as possible.

How to Apply

Ready to take the leap into building the next generation of smart contract systems? Send your resume along with a codebase you worked on that you are most proud of. Explain why you are particularly proud of this work.

Solidity Labs is an equal opportunity employer. We encourage applications from candidates of all backgrounds and experiences.