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- Tasks: Design and audit smart contracts for global crypto payments across multiple chains.
- Company: Join a pioneering company shaping the future of crypto and stablecoin payments.
- Benefits: Competitive salary, equity, remote work, flexible hours, and generous time off.
- Other info: Work fully remote with a culture that values flexibility and innovation.
- Why this job: Make a real impact in a high-stakes role with cutting-edge technology.
- Qualifications: 4+ years in smart contract development, expertise in Solidity, and security-first mindset.
The predicted salary is between 80000 - 100000 £ per year.
We are building the infrastructure powering the next generation of global crypto and stablecoin payments — connecting hundreds of millions of users across thousands of wallets and blockchain networks. Our on-chain layer is foundational to everything we do, and we take its security and correctness seriously.
As a Senior Smart Contract Engineer, you will design, write, and audit the on-chain contracts that sit at the heart of our payments network. You will work across multiple EVM-compatible chains and beyond, ensuring our protocol logic is secure, gas-efficient, and upgradeable where appropriate. This is a high-stakes, high-ownership role for engineers who hold security as a first principle and have the rigour to match.
What you'll do:
- Design and implement smart contracts for payment routing, settlement, and escrow across multiple chains.
- Own the full contract lifecycle — from specification and development through testing, deployment, and post-launch monitoring.
- Write comprehensive test suites using frameworks such as Foundry or Hardhat, including fuzz and invariant testing.
- Conduct internal security reviews and work closely with external auditors ahead of deployments.
- Develop and maintain upgrade and governance mechanisms that balance flexibility with on-chain security.
- Stay current with EVM developments, new opcodes, Layer 2 environments, and emerging cross-chain standards.
- Collaborate with backend and protocol engineers to ensure seamless integration between on-chain and off-chain systems.
What we're looking for:
- 4+ years of professional smart contract development experience, with production deployments on mainnet.
- Deep expertise in Solidity; familiarity with Vyper or Rust (for Solana/CosmWasm) is a bonus.
- Fluency with Foundry and/or Hardhat, including advanced testing patterns (fuzzing, invariant, formal verification).
- Strong understanding of EVM internals — storage layout, gas optimisation, call patterns, and common attack vectors.
- Experience with proxy patterns, upgradeability, and multi-sig governance frameworks.
- Familiarity with cross-chain messaging protocols (e.g. CCIP, LayerZero, Wormhole) and Layer 2 environments.
- Security-first mindset with practical experience identifying and mitigating common vulnerabilities (reentrancy, front-running, oracle manipulation, etc.).
- Strong written communication — able to produce clear specifications, post-mortems, and audit-ready documentation.
Nice to have:
- Experience with formal verification tools (e.g. Certora, Halmos, or Echidna).
- Background in payments, DeFi protocols, or stablecoin infrastructure.
- Prior work with external audit firms or a track record of responsible disclosure.
- Contributions to open-source smart contract libraries or EIPs.
What we offer:
- Competitive salary and equity package.
- Fully remote and async-friendly working culture.
- Flexible working hours and generous time off.
- Home office stipend and equipment budget.
- Token allocations and exposure to the cutting edge of Web3.
- High-ownership role with real impact at global scale.
Senior Smart Contract Engineer in London employer: TechChain Talent
Contact Detail:
TechChain Talent Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Smart Contract Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in the crypto and blockchain space on platforms like LinkedIn or Twitter. Join relevant groups and communities where you can connect with potential employers and other engineers.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your smart contract projects, especially those that highlight your expertise in Solidity and EVM internals. This will give you an edge when chatting with hiring managers.
✨Tip Number 3
Prepare for technical interviews by brushing up on common smart contract vulnerabilities and testing frameworks like Foundry or Hardhat. We recommend doing mock interviews with peers to get comfortable with the process.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who are proactive about their job search!
We think you need these skills to ace Senior Smart Contract Engineer in London
Some tips for your application 🫡
Show Off Your Skills: When you're writing your application, make sure to highlight your experience with smart contracts and any relevant projects you've worked on. We want to see your expertise in Solidity and any cool stuff you've done with EVM-compatible chains!
Be Clear and Concise: We love a good story, but keep it relevant! Make sure your application is easy to read and gets straight to the point. Use clear language to describe your past experiences and how they relate to the role.
Tailor Your Application: Don’t just send a generic application! Take the time to tailor your application to our job description. Mention specific skills and experiences that align with what we’re looking for, like your knowledge of security practices and testing frameworks.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates from us during the process!
How to prepare for a job interview at TechChain Talent
✨Know Your Smart Contracts Inside Out
Make sure you’re well-versed in the smart contracts you've worked on. Be ready to discuss your design choices, security considerations, and how you’ve tackled challenges in previous projects. This shows your depth of knowledge and commitment to security.
✨Showcase Your Testing Skills
Prepare to talk about your experience with testing frameworks like Foundry or Hardhat. Bring examples of comprehensive test suites you've written, especially those involving fuzz and invariant testing. This will demonstrate your attention to detail and understanding of contract lifecycle management.
✨Stay Updated on EVM Developments
Familiarise yourself with the latest EVM updates, new opcodes, and cross-chain standards. Being able to discuss recent developments shows that you’re proactive and passionate about the field, which is crucial for a role that demands high ownership.
✨Communicate Clearly and Effectively
Practice articulating your thoughts clearly, especially when discussing complex topics like governance mechanisms or security vulnerabilities. Strong written communication is key, so consider preparing a few specifications or post-mortems to share during the interview.