Senior Data Engineer

About CoW DAO

CoW DAO is on a mission to protect Ethereum users from MEV and optimize trade execution across DeFi. We achieve this through the CoW Protocol, CoW Swap (a leading intent-based DEX aggregator), and the innovative MEV Blocker, which together help secure, aggregate, and route trades for optimal outcomes. We also fund values-aligned projects via the CoW Grants Program.

CoW Protocol is consistently ranked among the top DEX aggregators by monthly volume and is the largest intent-based exchange. Our MEV Blocker protects trades from harmful MEV extraction and is integrated across the Ethereum ecosystem. The CoW AMM is the only live AMM designed to protect liquidity providers from LVR (loss-versus-rebalancing).

With over 100 open-source repositories on GitHub, we're transparent, community-driven, and deeply committed to the open-source ethos. Our real-time Dune Analytics dashboard showcases billions in cumulative trading volume and a rapidly growing user base. As we continue to scale, CoW DAO remains at the forefront of DeFi innovation, prioritizing security, efficiency, and decentralization.

Learn more

Location: Fully remote (Preference for Europe or remote ±4 hours CEST)
Contract Type: Full-time contractor
Note: Please note we are not hiring from the US, Australia, or New Zealand

About the role

At CoW DAO data plays a central role in how we understand on-chain activity and operate our fair combinatory auction system.

We’re looking for a Data Engineer who’s excited to dive deep into blockchain data (Ethereum and other L1/L2s), enrich it with insights from our off-chain auction system, and build the pipelines and infrastructure to support operations and analytics. This is a hands-on role where you’ll work across teams, design scalable systems, and make high-quality data accessible and actionable across the organization.

If you thrive in a fast-moving environment, love working with complex datasets, and want to shape the data foundation of a leading DeFi protocol, we’d love to hear from you.

What you’ll do

• Collaborate with teams across the company to understand their data needs and provide actionable insights

• Design, build, and maintain robust data pipelines and infrastructure for ingesting and processing on-chain and off-chain data

• Ensure data quality, reliability, and discoverability through testing, monitoring, and documentation

• Create tools and systems that make it easy to access, query, and visualize data (using tools like Redash, Metabase, or Looker)

• Keep an eye on the evolving blockchain data ecosystem—experiment with new tools and techniques to stay ahead

• Own your work end-to-end: from initial idea to deployment and maintenance

Who you are

• Solid experience designing and maintaining scalable data architectures (data lakes, warehouses, pipelines)

• Strong coding skills in Python and SQL

• Comfortable working with blockchain data providers and APIs (e.g. Dune, Etherscan, CoinGecko)

• Familiar with decoding Ethereum transactions and simulation tools (e.g. Tenderly, Phalcon)

• Experience with modern data orchestration frameworks (Dagster, Airflow, or Prefect)

• You write clean, tested, and well-reviewed code and follow best practices for deployment and monitoring

• You’re a self-starter, collaborative, and not afraid to take ownership

Nice to Have

• Familiarity with cloud platforms (AWS, GCP, etc.)

• Previous experience in a startup or high-growth environment

• Experience contributing to or using open-source data/analytics tools in the Web3 space

What We Can Offer You

• Flexible work environment: Join our hub in Lisbon whenever you want or work remotely

• Token plan: Have a stake in our mission and shape the future of CoW DAO

• Periodic gatherings: Meet your teammates in person during regular team retreats

• Conference allocation: Stay up to date with the latest in Web3 using our conference budget

• Learning budget: Support for personal and professional development

• Hardware budget: Set yourself up wit