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For Companies At a Glance
- Tasks: Build secure tools for digital assets and enhance blockchain interactions.
- Company: Join Project Eleven, a leader in quantum computing and cryptography.
- Benefits: Fully remote role with competitive salary and growth opportunities.
- Why this job: Make a real impact in the future of digital security and self-sovereignty.
- Qualifications: Proficient in Rust & Typescript, with Web3 development experience.
- Other info: Dynamic team focused on cutting-edge technology and innovation.
The predicted salary is between 36000 - 60000 ÂŁ per year.
About Project Eleven
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 have is clear: a proven upgrade path, production‑ready tooling and users retaining control of their assets and identity, before CRQC exists.
The role
We’re looking for a Senior Backend Engineer to join our growing Product Engineering team. As a Backend 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 for:
- 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
What you bring:
- Strong proficiency in Rust & Typescript (ideally both)
- 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
- Strong English communication
What we’d love to see:
- Understanding of ERC‑4337 smart wallet patterns e.g. EOA vs AA concepts, multisig basics, validation flows, bundlers/paymasters
- Experience with frontend development in React (or similar)
- Experience with iOS development or mobile development using React‑Native
- Experience developing and maintaining protocols
- Experience with decentralised identity, DIDComm, encrypted messaging protocols
- Open‑source contributions to Web3
Senior Backend Engineer in London employer: Project Eleven
Contact Detail:
Project Eleven Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Backend Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, attend meetups, and join online communities. The more connections we make, the better our chances of landing that Senior Backend Engineer role.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repository showcasing your projects, especially those related to Rust, Typescript, and Web3. This gives us a chance to demonstrate our expertise and passion for the field.
✨Tip Number 3
Prepare for technical interviews by brushing up on key concepts like blockchain transactions and cryptographic operations. We should practice coding challenges and system design questions to impress the interviewers.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure our application gets noticed. Plus, it shows we’re genuinely interested in being part of the Project Eleven team.
We think you need these skills to ace Senior Backend Engineer in London
Some tips for your application 🫡
Show Off Your Skills: Make sure to highlight your experience with Rust and Typescript in your application. We want to see how you've built backend services and APIs at production scale, so don’t hold back on the details!
Tailor Your Application: Take a moment to customise your application for this role. Mention specific projects or experiences that relate to blockchain transactions and security practices. We love seeing how you connect your background to what we do!
Be Clear and Concise: When writing your application, keep it clear and to the point. We appreciate straightforward communication, so make sure your skills and experiences shine without unnecessary fluff.
Apply Through Our Website: Don’t forget to apply through our website! It’s the best way for us to receive your application and ensures you’re considered for the role. We can’t wait to see what you bring to the table!
How to prepare for a job interview at Project Eleven
✨Know Your Tech Inside Out
Make sure you’re well-versed in Rust and Typescript, as these are crucial for the role. Brush up on your knowledge of blockchain technologies, especially Ethereum JSON-RPC and smart wallet patterns like ERC-4337. Being able to discuss your past projects and how you’ve implemented these technologies will show your expertise.
✨Showcase Your Security Savvy
Since this role involves handling security-critical libraries, be prepared to discuss your experience with authentication, encryption, and secrets management. Bring examples of how you've enforced security boundaries in previous projects, particularly in a post-quantum context, to demonstrate your understanding of the challenges involved.
✨Demonstrate Problem-Solving Skills
Expect technical questions that assess your problem-solving abilities. Practice coding challenges related to backend services and APIs, and be ready to explain your thought process. This will help interviewers see how you approach complex issues, especially in a fast-paced environment like Project Eleven.
✨Communicate Clearly and Confidently
Strong communication skills are essential, especially when discussing technical concepts. Practice explaining your work in simple terms, as you may need to collaborate with non-technical team members. Being clear and confident in your communication will make a positive impression during the interview.
