Senior Full Stack Engineer (Checkout)

About the role

Location Remote EMEA Employment Type Full time Location Type Remote Department Engineering Compensation €90K - €130K - Offers Equity The posted range represents the typical compensation range for this role. To determine actual compensation we review the market rate of each candidate which can include a variety of factors including qualifications, experience, and location. Additional benefits are shared as part of the job posting. A quick run-down of the job 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. You ll join at an exciting moment as the product takes shape, with a substantial roadmap of provider integrations, recovery flows, and UX improvements ahead. You ll work across multiple teams including backend, partner portal, and over time composer, earn, and intent solver. Strong communication and the ability to navigate codebases independently matter as much as technical depth. The role reports into the Embeddables/Checkout team and works closely with our Core backend team to ensure architectural alignment. Our tech stack includes: Backend: Node.js running TypeScript code in Docker containers MongoDB and Redis for our data ethers.js for communication with the blockchains Github, Kubernetes, AWS and CloudFlare for our GitOps CD chain Frontend: React with TypeScript Viem and Wagmi (preferred) Please note: This role is remote within the EMEA region. Your application will not be considered otherwise. What you ll do 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 What makes a good candidate 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 Nice to have Experience integrating onramp, exchange, or payment providers Familiarity with payments, fintech, wallet, or exchange systems including webhooks, reconciliation, quote systems, KYC, geography, refunds, or recovery tooling Genuine enthusiasm for crypto and the Web3 ecosystem; Checkout uses many of LI.FI s own primitives and understanding how they fit together accelerates your impact We encourage you to apply if you feel your experience and skills equip you for this job but are not listed here! Company culture Embracing the differences Embrace your own differences Respect and welcome the unique qualities of others See others differences as an opportunity to grow Own it, do it Own tasks end-to-end Hold yourself to a high bar for execution Make bold decisions, and be accountable Understand your limitations and seek for help Fail forward Try - don t be afraid to fail Learn - don t make the same mistake twice Adapt - grow with the experience Have fun together Take the time to get to know and understand each other better Don t take yourself too seriously and keep it light-hearted Fun should be coming from a place of love and respect What you ll get 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€

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