Senior Software Engineer (.NET/C#) - Logistics team

Allegro is seeking a Senior Software Engineer for their logistics team in Warsaw. The role involves designing and building high-availability backend systems using .NET/C#, processing millions of logistics events daily, with a modern tech stack including Azure, Kubernetes, and PostgreSQL.

• Design and build high-availability systems used by tens of thousands of users
• Tackle complex backend problems using technology
• Build and refine the high-performance infrastructure powering the logistics network
• Full ownership across the SDLC from design to delivery
• Work in an autonomous team with full ownership of services from design to deployment

• Extensive experience architecting high-throughput, low-latency backend systems using C# and .NET Core / ASP.NET Core
• Mastery of resilient RESTful APIs, modular monoliths, and microservices
• Deep expertise in relational database optimization using PostgreSQL and Entity Framework Core under high-concurrency workloads
• Pragmatic experience with legacy protocols (SOAP/WCF)
• Hands-on production experience in cloud-native environments using Docker, Kubernetes, and CI/CD
• Strong background in event-driven architectures and distributed messaging via Azure Service Bus or Kafka
• Solid grasp of caching and optimization techniques to ensure high availability and eventual consistency
• Understanding of backend considerations for mobile integration (payload optimization, offline synchronization, push notification architectures, API versioning)
• Proven technical leadership in mentoring engineers, driving code quality, and leading architectural reviews
• Full ownership across the SDLC from design to delivery
• Fluent in English (at least B2)

• Well-located offices with fully equipped kitchens, bicycle parking, terraces
• A Dell Laptop (Windows) and all the necessary accessories
• Wide selection of fringe benefits in a cafeteria plan (medical, sports, lunch packages, insurance, purchase vouchers)
• English classes paid for
• Training budget, inter-team tourism, hackathons, internal learning platform
• Additional day off for volunteering
• Social events (Spin Kilometers, Family Day, Fat Thursday, Advent of Code)
• Annual bonus based on performance and company results
• Long term discretionary incentive plan based on Allegro.eu shares (restricted stock units)