Senior Backend Engineer
P
Project ElevenWeb3 Development
Europe, GMT, GMT+1, GMT+2Full-TimeSenior
Salary not disclosed
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Job Details
- Languages
- English
- Required Skills
- Backend DevelopmentDockerBlockchainCybersecurityEthereumTypeScriptRustCI/CD
Requirements
- Strong proficiency in Rust & Typescript
- Experience building performant backend services, APIs and libraries at production scale
- Practical experience in Web3 development (e.g. Ethereum JSON-RPC, Viem/Ethers, Contract ABIs, call encoding/decoding)
- Good knowledge of CI/CD, service deployments, containerisation
- Strong security knowledge (e.g. authentication/authorization, signature verification, secrets management, encryption, especially post-quantum)
- High competency with automated testing (e.g. unit, integration and e2e testing)
Responsibilities
- Own and evolve a security-critical core library used by multiple applications and runtimes
- Design, implement, and maintain execution logic for blockchain transactions, signing flows, and protocol interactions
- Build and maintain robust abstractions over blockchain RPCs, transaction construction, and network interactions
- Enforce strict security boundaries around key handling, signing, and cryptographic operations
- Define and uphold API stability guarantees, versioning strategy, and backward-compatibility policies
- Contribute to internal security standards, documentation, and engineering best practices
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