Senior Full Stack Engineer (Checkout)

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€ 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.
This role is engaged via employer of record (EOR) or independent contractor arrangement.

Application process
Setting yourself up for success starts with the application! Click here to discover valuable tips that will help you navigate our application process effectively.
LI.FI is an equal opportunity employer. We encourage individuals of all backgrounds to apply. Join us in our dedication to fostering a workplace that values and respects each team member's unique contributions.
Shortlisted candidates will undergo a comprehensive interview process, including a people operations interview, a take-home assignment, a meet-the-team & founder interview, and a reference check.
For more information, visit our page detailing our hiring process!

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