Senior Full Stack Engineer - LI.FI

We're looking for a Senior Full-Stack Engineer (Checkout) to join our Embeddables squad and own the technical backbone of LI.FI's Checkout product. This is a backend-heavy full-stack role. You'll own full pipelines from UI components through to the backend services you build, focusing on provider integrations, routing intelligence, lifecycle state, and the partner-facing configuration that makes Checkout work end to end.

- 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

- 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

- Annual team offsites (Thailand in 2023, Vietnam in 2024, Marrakech in 2025, Crete in 2026; memories we'll never forget) - 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. *If you join us as an independent contractor, you’re only entitled to the first five benefits of this list.*

LI.FI is a cross-chain bridge and DEX aggregator that simplifies multi-chain trading by consolidating liquidity from multiple sources including DEX aggregators, bridges, and intent-systems. The platform provides developers with a comprehensive product suite including smart contracts, routing backends, SDKs, and customizable widgets to enable seamless cross-chain swaps and price discovery across blockchain ecosystems.