LI.FI · 3 months ago
Senior Backend Engineer - Intents API
United States
Full-time
Remote
Senior Level
5+ years expLI.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. They are seeking a Senior Backend Engineer to lead the development and scaling of their core off-chain coordination service, which is crucial for managing the Intent lifecycle and ensuring a secure cross-chain experience.
BlockchainFinanceFinancial ServicesFinTechInformation TechnologySoftware
Responsibilities
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, including logic for checking digital signatures, timing constraints, and necessary co-signatures
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, ensuring users and applications receive accurate, real-time status updates
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
Qualification
Required
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
Preferred
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)
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.
Company
LI.FI
LI.FI builds a multi-chain DeFi middleware for the application layer.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$52MKey Investors
1kx
2025-12-11Series A· $29M
2023-03-30Series A· $17.5M
2022-07-11Series Unknown· $5.5M
Leadership Team
Philipp Zentner
CEO, Founder
Max Klenk
Chief Technology Officer
Recent News
2025-12-25
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