Senior Backend Engineer - Intents API

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.

We're looking for a Senior Backend Engineer (Intents - Order Server) to lead the development and scaling of our core off-chain coordination service. This is a critical infrastructure role, as the Order Server is the central hub that manages the entire Intent lifecycle—from quote aggregation and intent validation to real-time broadcasting and cross-chain status tracking. You will be building the secure, high-throughput system using TypeScript and NestJS that allows applications to discover competitive quotes and protects our Solvers from fraudulent orders, enabling a robust and trustless cross-chain experience. This position is vital for the success of our solver-based Intents architecture.

Remote within the EMEA region (Europe, Middle East, Africa). Your application will not be considered if you’re outside of this region.

Your core mission will be to lead the technical direction and implementation of the central off-chain coordination system for our next-generation architecture. This is a critical infrastructure role focused on security, performance, and reliability.

• System Architecture & Development: Design, implement, and maintain the highly available, low-latency APIs required for seamless application interaction, quote management, and system-wide status retrieval using Node.js/TypeScript and the NestJS framework.

• Security & Validation Logic: Develop advanced and rigorous validation mechanisms to ensure data integrity and prevent fraudulent activity within the system, including logic for checking digital signatures, timing constraints, and necessary co-signatures.

• Real-Time Data Distribution: Build and optimize the infrastructure for immediate, real-time broadcasting of critical, validated data to all participating external liquidity providers and execution partners.

• Multi-Phase Status Tracking: Integrate with specialized data indexing services to reliably monitor and track the multi-phase lifecycle of core system objects across distributed environments, ensuring users and applications receive accurate, real-time status updates.

• Optimization of Execution Coordination: Implement advanced logic for data aggregation, caching, and mechanisms for partner reputation and selection to ensure the best possible user experience.

• Security & System Integrity: Proactively identify and resolve potential security vulnerabilities in the off-chain coordination flow to maintain the trustless nature of the overall system.

• Cross-Functional Collaboration: Work closely with the core Smart Contract and Product teams, and ensure comprehensive documentation for the backend architecture and APIs.

• 5+ years of backend development experience building and scaling high-throughput, mission-critical services.

• Expert proficiency in TypeScript/Node.js, with deep working experience using the NestJS framework for building scalable backend applications.

• Deep understanding of blockchain data and security primitives, including EIP-712 signatures, transaction execution flows, and reading on-chain events/logs.

• Proven experience in designing and scaling real-time communication systems (e.g., WebSockets, Redis Pub/Sub patterns).

• Solid experience with relational databases (PostgreSQL, etc.) and optimizing complex queries.

• Strong system design skills, with the ability to build fault-tolerant and highly available microservices.

• Experience with monitoring, logging, and observability tools to maintain system health.

• Ability to work autonomously, prioritize tasks effectively, and drive complex projects to completion in a fast-paced environment.

• Experience integrating with or developing against blockchain indexing services (e.g., Goldsky, The Graph, Subgraphs).

• Familiarity with Intent-centric architectures, Solvers, or off-chain order matching systems.

• Direct experience with cross-chain message passing or oracle systems like Polymer/Wormhole.

• Experience with Infrastructure as Code (e.g., Terraform) and cloud-native deployments (Kubernetes, AWS/GCP).

We encourage you to apply if you feel your experience and skills equip you for this job but are not listed here!

• 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

• 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.

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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!