Senior Backend Engineer

We’re working with an applied research and engineering lab operating at the intersection of cryptography, blockchain, and emerging technologies. The team builds production-grade infrastructure designed to secure digital assets long term, with a strong focus on forward-looking cryptographic standards and real-world constraints. Their work spans tooling, integrations, audits, testnets, and applied research alongside leading ecosystem partners.
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The Role

As a Senior Backend Engineer, you’ll join a growing Product Engineering team responsible for building and maintaining security-critical backend systems that power next-generation digital asset infrastructure. This is a full-time, fully remote role based in Europe (GMT–GMT+2).
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What You’ll Do

• Own and evolve a security-critical core library used across multiple products
• Design and maintain execution logic for blockchain transactions and signing flows
• Build robust abstractions over blockchain RPCs and network interactions
• Enforce strict security boundaries around key management and cryptographic operations
• Define API stability, versioning, and backward compatibility standards
• Contribute to internal security standards, documentation, and best practices
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What You Bring

• Strong proficiency in Rust and/or TypeScript (ideally both)
• Experience building high-performance backend services, APIs, or libraries
• Hands-on Web3 experience (Ethereum JSON-RPC, ABIs, transaction encoding)
• Solid understanding of CI/CD, deployments, and containerisation
• Strong security fundamentals (auth, signing, secrets, encryption)
• High competency in automated testing and clear English communication
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Nice to Have

• Familiarity with ERC-4337 and account abstraction concepts
• Frontend experience (React or similar)
• Mobile development experience (iOS or React Native)
• Protocol or decentralised identity experience
• Open-source contributions in Web3 or cryptography

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