Hardhat Web3 Jobs in London, United Kingdom

About Symbiotic

At Symbiotic, we are building a permissionless shared security primitive that empowers network builders to shape and personalise their unique restaking implementation. Our goal is to minimise risks while maximising freedom for all you wonderful builders of crypto infrastructure networks. We have a robust developer-centric proposition and we can't wait to share it with everyone.

You can find more information about what we're building and how we're doing it in our docs.

Our People

We're a tight-knit team of experienced individuals at the forefront of crypto infrastructure. Our backgrounds range from security auditing and smart contract development to node operation, and we're supported by Paradigm and CyberFund.

We're on the hunt for talented professionals to join our mission and strengthen our awesome team.

The Role

We are seeking a Senior Smart Contract Engineer to work on our existing smart contract codebase, including core contracts, core extensions, and middleware SDK, as well as develop new upcoming modules.

What You'll Do

• Work at the intersection of blockchain protocols and smart contracts, contributing to the design and development of EVM-based systems

• Write, optimize, and audit smart contracts in Solidity, with a focus on performance, clarity, and security

• Build and experiment with staking, DeFi, and other protocol-level primitives

• Leverage tools like Foundry and Hardhat for development, testing, and deployment

• Conduct and support security audits, addressing vulnerabilities and integrating best practices

• Collaborate closely with protocol engineers to support integrations across L1 and L2 chains

• Work with web3 libraries like ethers.js, viem, and web3.py for off-chain contract interactions

• Occasionally contribute to related tooling and scripting in Python and TypeScript

Who You Are

• Strong understanding of Ethereum L1/L2 architecture and PoS mechanisms

• Familiar with blockchain primitives such as consensus algorithms and cryptography

• Deep knowledge of EVM internals: execution flow, memory/storage models, gas mechanics, and precompiles

• Expert in Solidity, with exposure to Yul, Vyper, or Huff (a plus)

• Solid grasp of DeFi concepts: DEXes, lending protocols, stablecoins, and staking mechanisms

• Proficient with Foundry, Hardhat, and comfortable working with ethers.js, web3.js, viem, or web3.py

• Strong security mindset, familiar with common attack vectors and the auditing process

• Practical coding experience in Python and JavaScript/TypeScript

Nice to Have

• Experience in compilers development

• Experience in Rust, Go, C/C++

• Experience in protocol development such as L1, L2

• OP stack, Arbitrum knowledge

• Experience with ZK on EVM