Senior Backend Engineer

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 etc 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

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