Senior Full Stack Engineer - LI.FI at LI.FI · Web3Vacancy
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Senior Full Stack Engineer - LI.FI

Remote
Market range (est.) $120k–$245k
◆ 7/10 cryptodevweb3Full Stack Developer
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About this role

Join LI.FI as a Senior Full Stack Engineer to own the technical backbone of their Checkout product, focusing on backend-heavy development and provider integrations in a remote role within Europe.

Description

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.

Responsibilities
  • 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
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
Conditions & Benefits
  • 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.
Job Details
Market range (est.)$120k–$245k
LocationRemote
AI Score★★★★★★★☆☆☆ 7/10
PostedMay 22, 2026 (51d ago)
Tags & Skills
cryptodevweb3Full Stack Developerremote
Tech Stack
Node.jsTypeScriptDockerMongoDBRedisethers.jsGitHubKubernetesAWSCloudFlareReactViemWagmi

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