Senior Backend Engineer – Mobile

Sunweb GroupRotterdam and The HagueHybridFull-time3 weeks ago

Sunweb Group is seeking a Senior Backend Engineer – Mobile to join Team Cuba, responsible for designing, building, and operating cloud-native .NET services and REST APIs on Azure for their native apps. The role requires 5+ years of C#/.NET experience, strong API design skills, and offers a hybrid work model with locations in Girona or Rotterdam.

What you'll do

Design, build and operate cloud-native .NET services and REST APIs on Azure.
Create stable, versioned and backwards-compatible contracts.
Own critical mobile-backend capabilities end to end.
Develop services covering app configuration, feature toggles, push notifications and mobile BFF functionality.
Model complex travel domains such as bookings, customer information, excursions, transfers and payments.
Integrate with other Sunweb product teams and external partners.
Raise standards for testing, CI/CD, observability, security, performance and documentation.
Take ownership from technical design through deployment, monitoring and production support.
Collaborate directly with mobile native engineers, Product Owner, Engineering Lead, architects and platform specialists.
Mentor mobile engineers on backend and API topics.
Help define how backend engineering works within a mobile-first team.

What you need

Must-have

C#.NETMicrosoft AzureREST APIsSQLGitHub ActionsCI/CDNew Relic

Nice-to-have

BFF patternspush notificationsremote configurationfeature togglesthird-party integrationpayment servicesevent-driven architecturemessaging

Soft skills

ownershipproactive written communicationstakeholder-communicationtechnical judgementmentoring

Senior Backend EngineerMobileTravelC#.NETAzureREST APIsFull-timeHybridRotterdam

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