Senior Smart Contract Engineer

About Wildcat Wildcat is an Ethereum protocol revolutionizing on-chain credit with an innovative, under-collateralized borrowing solution. Our mission is to lead this market by enabling borrowers to create, customize, and manage credit facilities in a more transparent, efficient, and secure environment. Borrowers can tailor their credit demand to suit their needs. Designed for sophisticated participants in both TradFi and DeFi, Wildcat is committed to transforming on-chain credit and unlocking more efficient, customized solutions in decentralized finance. Working for Wildcat  As a Senior Smart Contract Engineer, you will drive the technical evolution of Wildcat s under-collateralized lending platform. You ll concentrate on Solidity and back-end services—building the core market contracts, the optional transaction hooks that extend them, and the adapters that let external DeFi protocols plug into our credit markets—then assist with wiring everything into a Node.js/TypeScript stack. Leveraging agile practices and DeFi expertise, you ll shape the platform s architecture, feature set, and scalability in close collaboration with the team, ensuring Wildcat stays at the forefront of under-collateralized on-chain credit. Responsibilities    Smart-Contract & Protocol Development • Design immutable market contracts plus optional hook modules that gate deposits, withdrawals, rate changes, sanctions checks, and liquidation callbacks. • Build adapter contracts and wrappers so Wildcat positions expose a widely-supported ERC interface, making them plug-and-play collateral or yield assets in external protocols. • Build modular access-control contracts that verify lender eligibility - using Merkle whitelists, soul-bound credentials, or zero-knowledge attestations - and include automated expiry and renewal logic to keep the whitelist current.  • Optimize storage and opcode paths; benchmark gas and apply EIP-5656-style tricks. • Orchestrate multichain releases — deterministic deployments to mainnet and leading L2s/side-chains, with chain-specific parameters, address registries, and automated roll-out scripts. • Build cross-chain messaging / bridge flows to keep Wildcat credit events and adapter states in sync across networks; own monitoring and fail-over run-books.    Back-End Development • Build lightweight Node.js/TypeScript services plus GraphQL / REST APIs that expose contract actions and analytics. • Author subgraphs or custom indexers to surface reserve ratios, delinquency data, and cross-protocol collateral metrics in real time.    Testing & Security • Own a Foundry test-bed: unit, fork, invariant, and fuzz tests covering market logic, hook paths, and cross-protocol interactions. • Lead threat modelling and coordinate external audits; integrate the Sentinel sanctions flow, and design immutable incident-response playbooks that protect users without relying on a global pause or stop-button.    Deployment & ChainOps • Automate deterministic deployments to testnets and mainnet via CI (GitHub Actions, Docker). • Manage multisig operations, adapter-whitelisting scripts, and incident-response tooling.    Requirements • 4 + years Solidity with mainnet-deployed contracts—ideally in lending, credit, or other high-TVL verticals. • Proven skill in hook patterns (delegatecall, minimal proxies) and cross-protocol adapter design; comfortable operating without proxy upgrades. • Deep expertise with Foundry testing, gas profiling, and CI pipelines. • Ability to spin up lean Node.js/TypeScript back-ends and PostgreSQL schemas that ingest on-chain events. • Security-first mindset: you track exploits, write audit-ready specs, and mitigate oracle or reentrancy risks (experience with Prisma and other type-safe data tools is a plus). • Clear written & verbal English communication in a distributed, EU-centric team. • Proven experience shipping and managing Solidity contracts on multiple EVM chains (mainnet, rollups, side-chains) and integrating at least one cross-chain messaging or bridge protocol. What We Offer • Impact & Ownership – shape a protocol redefining private credit. • Cutting-Edge Work – collaborate with seasoned DeFi and TradFi experts at the intersection of risk, composability, and compliance. • Remote Flexibility – work from anywhere; core collaboration overlaps with EU hours. • Competitive Compensation – salary in crypto or fiat, plus meaningful token/equity upside. • Professional Growth – budget for conferences, audits, courses, and hackathons.