Senior Backend Engineer (Fee Consolidation Service)

LI.FI is 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 join our backend organization and strengthen the team building our partner backoffice software, with an added emphasis on crypto literacy and blockchain-aware system design. This role is aimed at a senior individual contributor who is comfortable operating in crypto products as a user and can translate that understanding into robust backend and API decisions.
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

• Node.js with TypeScript, running in Docker containers

• MongoDB and Redis

• ethers.js for blockchain communication

• GitHub, Kubernetes, AWS, Cloudflare for our GitOps CD pipeline

What you’ll do

• Design, develop, and maintain backend systems and APIs, with a strong emphasis on clean, consistent, and evolvable API design

• Build backend functionality that interacts with crypto-native concepts and workflows, informed by hands-on experience as a crypto user

• Collaborate closely with frontend engineers and product to translate crypto-related requirements into intuitive, reliable backend interfaces

• Contribute to the architecture of scalable and robust backend solutions that support partner-facing and internal use cases

• Maintain high engineering standards through code reviews, strong abstractions, and clear, readable code

• Identify performance and reliability bottlenecks and improve system behavior, data access patterns, and caching strategies

• Implement and maintain monitoring, logging, and debugging tooling to ensure high system availability

• Build and maintain comprehensive automated test suites across backend services

• Act as a senior technical contributor within the team, supporting design discussions and raising the overall technical bar

• Document APIs, system behavior, and technical decisions for long-term maintainability

What makes a good candidate

• 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 and maintain high-quality APIs

• Practical familiarity with crypto products and ecosystems as a user (wallets, swaps, bridges, DeFi, etc.)

• Development experience in blockchain or Web3 systems is a plus, but not required

• 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 backend 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

• Very strong written and spoken English

• Bachelor’s or Master’s degree in Computer Science is a plus

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 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

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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!