Senior Smart Contract Engineer

web3-resources; London; On-site; USD 65,000 - 257,000; Full time

Job summary

A leading company in crypto infrastructure seeks a Senior Smart Contract Engineer to enhance their smart contract codebase. The role involves writing and optimizing smart contracts using Solidity, conducting audits, and working on various blockchain protocols. Ideal candidates will have deep Ethereum knowledge, a strong security mindset, and familiarity with DeFi concepts.

Qualifications

• Strong understanding of Ethereum L1/L2 architecture and PoS mechanisms.
• Expert in Solidity; knowledge of Yul, Vyper, or Huff is a plus.
• Proficient with web3 libraries like ethers.js and tools like Foundry.

Responsibilities

• Contribute to the design and development of EVM-based systems.
• Write, optimize, and audit smart contracts in Solidity.
• Collaborate closely with protocol engineers to support integrations.

Skills

Smart contract development

Solidity

Security auditing

DeFi concepts

EVM knowledge

Tools

Foundry

Hardhat

ethers.js

web3.py

Job description

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

Nice to Have

Experience in Rust, Go, C/C++

Experience in protocol development such as L1, L2

The average yearly salary for a Solidity Developer is $150k per year, with a minimum base salary of $65k and a maximum of $257k.

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