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LI.FI logo
LI.FI

The multi-chain liquidity gateway. A DeFi middleware to build crypto-enabled businesses.

Senior Backend Engineer – Intents API

Backend EngineerSoftware EngineerFull TimeRemoteSeniorTeam 11-50H1B No SponsorCompany SiteLinkedIn

Location

Germany

Posted

64 days ago

Salary

€110K - €140K / year

Seniority

Senior

Job Description

Senior Backend Engineer – Intents API

LI.FI

• Lead the technical direction and implementation of the central off-chain coordination system for our next-generation architecture. • 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. • Develop advanced and rigorous validation mechanisms to ensure data integrity and prevent fraudulent activity within the system. • Build and optimize the infrastructure for immediate, real-time broadcasting of critical, validated data to all participating external liquidity providers and execution partners. • Integrate with specialized data indexing services to reliably monitor and track the multi-phase lifecycle of core system objects across distributed environments. • Implement advanced logic for data aggregation, caching, and mechanisms for partner reputation and selection to ensure the best possible user experience. • Proactively identify and resolve potential security vulnerabilities in the off-chain coordination flow to maintain the trustless nature of the overall system. • Work closely with the core Smart Contract and Product teams, and ensure comprehensive documentation for the backend architecture and APIs.

Job Requirements

  • 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.

Benefits

  • 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.

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