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The multi-chain liquidity gateway. A DeFi middleware to build crypto-enabled businesses.
Senior Full Stack Engineer – Checkout
Location
Europe
Posted
60 days ago
Salary
€90K - €130K / year
Seniority
Senior
Job Description
Senior Full Stack Engineer – Checkout
LI.FI
• Own Checkout-specific backend capabilities that power funding flows end to end, including provider integrations, quotes, sessions, statuses, deposit addresses, and recovery • Design and build integration patterns for external providers (onramp, exchange, payment), normalising provider-specific behaviour into a consistent Checkout experience • Define and maintain the backend contracts between Checkout UI, provider systems, and LI.FI's execution infrastructure, including robust state handling across long-running and failure-prone flows • Drive cross-functional technical discovery when Checkout depends on Core backend, Partner Portal, or other adjacent teams, ensuring architectural alignment without drift • Implement frontend work where useful, particularly when UI states and backend contracts need to be designed together
Job Requirements
- Strong backend engineering experience with expert proficiency in TypeScript/Node.js, plus full-stack ability to work across API contracts and UI states using React and TypeScript (viem and wagmi a plus)
- Proven experience integrating external APIs with provider-specific edge cases, with good instincts around async flows, failures, observability, and recovery
- Working-level Web3 knowledge: you understand transactions, block explorers, and how products like bridges and DEX aggregators fit together (smart contract development not required)
- Strong product judgement and the ability to navigate multiple teams and codebases without hand-holding, working across boundaries without creating architecture drift
- Excellent communication skills in English and comfort in a fast-paced, high-growth environment where priorities evolve quickly.
Benefits
- Annual team offsites (Thailand in 2023, Vietnam in 2024, Marrakech in 2025, Crete in 2026; memories we'll never forget. Already dreaming about where 2027 will take us!)
- 30 days of PTO
- Flexible remote days
- Flexible working hours
- Equity participation from day 1
- Entitlement to work computer (choice of equipment)
- An annual 1,000€ personal development budget once you have worked 6+ months (pro-rated the first year)
- A one-time 1,000€ remote budget to use on coworking, office setup, etc.
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