About Us

Chainway Labs is seeking a Senior Full Stack Engineer to join our team at Citrea, Bitcoin’s First ZK Rollup.

At Citrea, our goal is to secure on-chain finance with Bitcoin. We believe that Bitcoin and its values should be scaled to serve as the standard for decentralized finance. Achieving this vision requires scaling Bitcoin with zero-knowledge proofs, ensuring on-chain verifiability and data availability within the Bitcoin network.

This approach makes Citrea the first scaling solution to enable more complex applications without compromising Bitcoin security and changing its consensus rules.

Our Mission

At Chainway Labs, we are dedicated to scaling the Bitcoin Network, with a vision to transform financial infrastructure globally. Upholding core values of privacy, innovation, and scalability, we strive to build solutions that embody these principles within the Bitcoin ecosystem.

About the Role

You'll design and run the services that power our Bitcoin L2: APIs, indexing pipelines, transaction builders, and integrations with Bitcoin Core and supporting infrastructure.

Responsibilities:

• Build type-safe services in Node.js / Next.js; design clean REST (or RPC) APIs
• Model data and write performant PostgreSQL queries, indexes, and migrations
• Implement Bitcoin-aware business logic 
• Integrate with Bitcoin nodes/daemons (RPC/JSON-RPC), handle reorgs, and maintain idempotent jobs
• Own reliability: observability, structured logging, alerting, and back-pressure queues
• Bake in security from day one

Required Skills

• 3+ years building full-stack production apps with Node.js/TypeScript and Next.js
• Strong Postgres skills: schema design, transactions, indexing, query tuning
• Experience designing reliable APIs and background job workflows
• Solid testing: unit/integration and contract testing against real services
• Understanding of precision/rounding and money handling
• Bitcoin/crypto domain knowledge: UTXO set, mempool policy, Taproot, PSBT

Nice-to-haves

• Experience with Bitcoin Core RPC, block/mempool indexing, or L2/rollup concepts
• Queues (e.g., BullMQ)

✏️ Learn more about how Citrea is shaping the future of Bitcoin by visiting our Blog for the latest updates!

Chainway Labs is an equal opportunity employer, committed to fostering a diverse and inclusive workplace. We appreciate the interest of all applicants; however, only those selected for an interview will be contacted.

Thank you for considering a career with us!