Our partner is looking for a Backend Engineer, Solving based in Spain.
As a Backend Engineer, Solving, you will develop and maintain the core systems that power fast, reliable, and cost-efficient cross-chain transactions.
You will build the software responsible for generating quotes, optimizing trade routes, and executing user requests across on-chain and off-chain liquidity venues.
Working primarily with Type Script and Node.Js, you will tackle complex backend challenges across decentralized finance (De Fi), blockchain infrastructure, and payment systems.
This is a high-impact, hands-on role offering significant ownership, technical autonomy, and the opportunity to shape infrastructure that makes blockchain transactions more accessible.
Develop and maintain integrations with decentralized exchanges (DEXs) and aggregators, including 1inch, Li Fi, and Uniswap, implementing contract-level transaction calldata, multi-hop routing, slippage management, and gas estimation.
Own end-to-end transaction pipelines, from deposit detection and quote generation through trade execution and settlement, ensuring reliable processing across complex, multi-stage workflows.
Improve system reliability and operational visibility by implementing structured error propagation, monitoring, alerting, and incident-triage workflows using tools such as Datadog.
Identify, investigate, and resolve execution failures and performance bottlenecks, accounting for transaction reverts, retry mechanisms, liquidity constraints, gas-price spikes, and other edge cases.
Take ownership of projects from initial design through implementation, testing, deployment, and ongoing optimization,



ensuring that solutions meet performance, reliability, and business requirements.
Contribute to the continuous improvement of backend architecture, engineering practices, and operational tooling to support a scalable and dependable cross-chain transaction infrastructure.
Requirements Strong backend engineering experience with Type Script and Node.Js, including the ability to develop, maintain, and optimize production-grade backend services.
Demonstrated ability to design and own complex, multi-stage processing pipelines, connecting transaction detection, pricing, execution, and settlement into reliable end-to-end systems.
Excellent problem-solving and analytical skills, with the ability to navigate technical complexity, make sound engineering decisions, and balance execution performance, pricing, and reliability.
A high degree of ownership and autonomy, including the ability to drive projects independently from concept to production, manage technical trade-offs, and take responsibility for outcomes.
Effective communication and collaboration skills, with the ability to work across engineering teams, share technical context, and contribute to a collaborative, remote-first environment.
Nice to have Experience with cross-chain bridging protocols, blockchain interoperability, or intent-based architectures.
Experience with Bull MQ, Redis-backed job queues, or comparable asynchronous processing infrastructure.
Remote-first working environment that emphasizes flexibility, collaboration, and clear communication.
Opportunity to work on high-impact blockchain infrastructure serving millions of users across multiple blockchain networks.

📌 Backend Node.js Engineer (remote) (Valladolid)
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