Career Renew is recruiting for one of its clients a Senior Solidity Engineer - this is a fully remote role in N/S America or Europe.

We are on a mission to redefine capital markets infrastructure through cutting-edge on-chain derivatives and protocol architecture. We're seeking a highly experienced Senior Solidity Engineer (or VP of Engineering, depending on seniority fit) to join our remote-first team. This is a pivotal leadership role within our smart contract engineering group, working alongside the Chief Protocol Officer, Engineering Manager, and cross-functional product leaders to build next-generation EVM-based DeFi infrastructure.

The team comes from established protocols, hedge funds, and market makers, and is backed by Polychain, Van Eck, Binance, Selini, Hashed, and others.

Key Responsibilities

• Serve as one of the primary owners of Solidity development within a high-performing team of 6 smart contract engineers.

• Architect, develop, and optimize secure, gas-efficient smart contracts powering Concrete's DeFi protocol.

• Contribute to protocol design, audits, and security reviews with deep technical ownership.

• Collaborate with product and project managers to align technical deliverables with roadmap priorities.

• Drive the evolution of Concrete's on-chain architecture, with potential to scale across multiple chains.

• Stay ahead of developments in the Ethereum ecosystem and contribute to open-source efforts as relevant.

Requirements:

3–4+ years of professional experience writing secure Solidity smart contracts & Familiarity with Solidity optimisation, gas cost analysis, and safe architectural practices.

Proven engineering background within an EVM-based DeFi protocol.

Strong understanding of smart contract testing, deployment frameworks, and upgradeability patterns.

Experience with cross-chain architectures, L2s, and bridging protocols is a nice to have.

Prior leadership experience or desire to grow into a VP-level technical leadership role.