Senior Smart Contract Engineer - DeFi Protocol Architecture

X-Team • United States

Remote

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AI Summary

Build and scale secure on-chain infrastructure for next-gen open finance. Design, implement, and battle-test critical smart contracts managing significant TVL. Lead protocol architecture from design to mainnet deployment and audits.

Key Highlights

Fully remote role with meaningful overlap with US/EU working hours

4+ years of software engineering with 2+ years in secure Solidity smart contracts

Deep expertise in DeFi primitives, EVM internals, and security-focused testing

Key Responsibilities

Design and implement secure, gas-optimized Solidity smart contracts for lending, borrowing, vaults, yield routing, liquidations, and access control

Write extensive unit, integration, fork, fuzz, and invariant tests to ensure zero-day resiliency

Prepare codebases for top-tier external audits, remediate findings, and design proactive on-chain risk mitigation strategies

Collaborate with risk, frontend, indexer, and quantitative engineering teams to build seamless, secure end-to-end dApps

Take deep ownership of smart contract architecture from initial mathematical modeling through mainnet deployment and live monitoring

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Technical Skills Required

Solidity Foundry (Forge, Cast) EVM Internals

Benefits & Perks

Fully remote work

Meaningful overlap with US/EU working hours

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Nice to Have

Prior experience guiding a protocol through a major external audit (e.g., Trail of Bits, OpenZeppelin, Spearbit)

Exposure to Rust-based smart contract environments (SVM/Solana, CosmWasm) or zero-knowledge (ZK) rollup architectures

Familiarity with off-chain automation infrastructure like Keepers, Defender, or Gelato

Job Description

This role is a full-time engagement with the client, fully remote. Open to LATAM, USA & Canada.

The Mission

Help build and scale the secure on-chain infrastructure powering the next generation of open finance. In this role, you’ll design, implement, and battle-test critical smart contracts that manage significant TVL and capital-efficient primitives. This isn't about deploying speculative tokens; it’s about constructing highly resilient, mathematical, and adversarial-resistant software that remains upgradeable, cost-efficient, and bulletproof over time.

The Role

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