Senior Backend Engineer (Partner Service) At LI.FI
Job Description
Summary
We are simplifying multi-chain DeFi for traditional financial institutions, fintechs and service providers by offering a unified API to access all on-chain liquidity across major blockchains for best price same-chain and cross-chain swaps. We are a passionate team on a mission to enable a fairer, more decentralised world. Apart from the tech, we care a lot about user experience and aim to make complex technologies accessible to everyone.
A quick run-down of the job
We’re looking for a Senior Backend Engineer to strengthen our engineering team, with a strong focus on API design and long-term system quality. You’ll join the team building and evolving our partner backoffice software and act as a senior individual contributor with meaningful technical influence across the product.
This role sits within a cross-functional team made up of a Product Owner, frontend engineers, and backend engineers, jointly responsible for building and maintaining our partner backoffice software.
Location requirement: You must be located in the EMEA region. Applications outside EMEA will not be considered.
Tech Stack
GitHub, Kubernetes, AWS, Cloudflare for our GitOps CD pipeline
Node.js with TypeScript, running in Docker containers
MongoDB and Redis
ethers.js for blockchain communication
What you’ll do
Design, develop, and maintain backend systems and APIs, with a strong emphasis on clear, consistent, and well-versioned API design
Take ownership of API contracts and backend interfaces used by frontend applications and partner-facing systems
Contribute to the architecture of scalable and robust backend solutions that support growing usage and evolving product needs
Maintain high engineering standards through code reviews, thoughtful abstractions, and clean, readable code
Identify performance bottlenecks and optimize system behavior, data access patterns, and caching strategies
Implement and maintain monitoring, logging, and debugging tooling to ensure high availability and operational confidence
Build and maintain comprehensive test suites, including unit, integration, and end-to-end tests
Act as a senior technical contributor within the team, supporting other engineers through collaboration, reviews, and design discussions
Analyze complex technical problems and propose pragmatic, production-ready solutions
Document APIs, systems, and technical decisions to support knowledge sharing and onboarding
What makes a good candidate
Bachelor’s or Master’s degree in Computer Science is a plus
Must be located in the EMEA region
Strong professional experience with TypeScript and Node.js
Extensive experience working as a senior backend engineer on production systems
Proven ability to design clean, maintainable, and scalable APIs
Solid understanding of document databases and caching systems (e.g. MongoDB, Redis)
Experience with backend architecture and system design in distributed environments
Deep knowledge of testing principles and modern testing frameworks
Strong communication and collaboration skills in cross-functional teams
Proactive, self-directed, and comfortable taking ownership of backend domains
Ability to write maintainable, scalable, production-grade code
Experience or interest in blockchain or EVM-based systems is a plus, but not required
Very strong written and spoken English
Company culture
Fun should be coming from a place of love and respect
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
What you’ll get
- Annual team offsites (Thailand in 2023 and Vietnam in 2024 were a blast, Marrakech in March 2025 was blast-ier; let’s see what happens in 2026!)
- 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.
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!
Compensation Range: €80K – €130K
About LI.FI
LI.FI provides cross-chain bridge & DEX aggregation to power next-gen DeFi projects with superior UX.
The complexity of moving and sourcing assets across a vast amount of blockchain ecosystems is simplified down to one API. LI.FI’s middleware offers DEXs, DEX aggregators, cross-chain bridges, all necessary data sources, and smart order routing.
