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.A quick run-down of the jobWe'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.🌍 Location Remote within the EMEA region (Europe, Middle East, Africa). Your application will not be considered if you’re outside of this region.What you’ll doYour 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.What makes a good candidate5+ 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.Nice to havesExperience 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).Company cultureEmbracing the differencesEmbrace your own differencesRespect and welcome the unique qualities of othersSee others’ differences as an opportunity to growOwn it, do itOwn tasks end-to-endHold yourself to a high bar for executionMake bold decisions, and be accountableUnderstand your limitations and seek for helpFail forwardTry - don’t be afraid to failLearn - don’t make the same mistake twiceAdapt - grow with the experienceHave fun togetherTake the time to get to know and understand each other betterDon’t take yourself too seriously and keep it light-heartedFun should be coming from a place of love and respectWhat you’ll getAnnual 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 PTOFlexible remote daysFlexible working hoursEquity participation from day 1Entitlement 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 processSetting 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!