Project Eleven is an applied lab of builders and technologists working at the intersection of quantum computing and cryptography. We build impactful solutions that push the digital-asset ecosystem to a more secure future. Our focus is post-quantum migration: upgrading wallets, identity, and settlement rails to quantum-safe primitives without breaking UX, composability, and developer workflows.
Our mission is to future-proof digital assets and preserve self-sovereignty in a post-quantum world. We do that by building the canonical tooling and products teams can adopt: crypto-agile infrastructure, reference implementations, and integrations that fit real constraints like latency, cost, compatibility, key rotation, and recovery.
We work with leading ecosystems to make this migration real through products we build, audits, testnets, and cutting edge research. The vision we are have is clear: a proven upgrade path, production-ready tooling and users retaining control of their assets and identity, before CRQC exists.
The roleWe're looking for a Senior Protocol Engineer to join our growing Product Engineering team. As a Protocol Engineer, you'll play a pivotal role in helping to build the canonical tools and products to protect digital assets and preserve self-sovereignty in a post-quantum world.
This role is a full-time, fully remote position in Europe (GMT to GMT+2).
What you'll be responsible forDesign, implement, and maintain long-lived smart contracts intended for production use and high-value deployments
Own contract architecture decisions including upgradeability, storage layout, initialization, and lifecycle management
Identify, mitigate, and document security risks related to smart contracts and on-chain protocol logic
Prepare contracts for external audits, respond to findings, and implement remediation safely
Develop comprehensive test suites including unit tests, integration tests, fork testing, and fuzzing
Manage contract deployments, upgrades, and post-deployment monitoring in live environments
Collaborate with off-chain engineers to ensure safe and consistent interaction between on-chain and off-chain systems
Evaluate and adopt relevant standards and best practices within the smart contract ecosystem
Deep experience with Solidity development and shipping production contracts
Strong understanding of proxy patterns, upgrade safety, storage, initialiser patterns, contract lifecycle management
Excellent knowledge of EVM internals and common vulnerabilities e.g. Reentrancy, storage collisions, signature replays etc
Demonstrable experience preparing contracts for formal audits
Familiarity with ERC standards (especially ERC-20, ERC-721, ERC-4337, ERC-1271)
Experience deploying and maintaining high-value contracts on mainnet e.g. deployments, proxy upgrades with no downtime, post-deployment monitoring
Strong testing and debugging e.g. complex integration tests, gas profiling and optimisations, fork testing, fuzzing
Strong English communication
Experience with ERC-4337 account abstraction
Awareness and understanding of post-quantum cryptography
Experience developing with ZeroDev, Biconomy or Alchemy accounts
Token Sale / ICO experience i.e. an understanding of vesting schedules, token distribution contracts, TGE mechanics
Auditor collaboration - Experience working with auditors and running internal pre-audits
Experience contributing to Ethereum standards, open-source crypto projects, AA frameworks or wallets
We are committed to equal employment opportunity and believe that diverse teams build better products. All qualified applicants will receive consideration without regard to any protected characteristic under applicable law.
