Senior Backend Engineer

A senior engineering role based in Spain, working fully remotely for a company headquartered in Barcelona that holds an annual team offsite there. The product is a booking platform where reliability, financial accuracy and fast real-time availability matter a great deal. The role suits an experienced backend engineer who enjoys complex domain logic, event-driven systems and steering a careful legacy migration, and who is comfortable mentoring others and working in English.

What you'll do

• Design and evolve a core reservation engine covering booking lifecycles, quotes, taxes, fees and financial ledgers
• Lead a zero-downtime migration from an older .NET data stack to a newer framework and PostgreSQL
• Build and run event-driven messaging using RabbitMQ and Kafka with reliable delivery patterns
• Optimise a calendar service for real-time availability under strict latency targets
• Define service level objectives and improve observability and monitoring
• Mentor engineers through code reviews and technical documentation

What you need

• 7+ years of professional backend development with C# and .NET 8 or .NET Core
• 3+ years designing and operating event-driven systems with RabbitMQ or Kafka
• Strong practical knowledge of Entity Framework Core and zero-downtime schema migrations on PostgreSQL or SQL Server
• Experience with Domain-Driven Design, CQRS and layered or onion architecture
• Experience with testing and APM tooling such as Datadog
• Fluent written and spoken English; CV submitted in English

Applicants must be based in: Spain.

How to apply

Get the free i'llTip app to see the employer's details and apply. i'llTip's AI can tailor your résumé to this job, and you'll get alerts for similar roles.

Prefer the website? Continue on illtip.comOr get the app: Android · iPhone

🔔 Get new jobs like this first: join i'llTip Jobs on Telegram · or get personal job alerts