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!
Apply To This 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!
Apply To This Job