Senior .NET/C# Backend Engineer - High-Scale Logistics

Allegro.eu S.A.; Warszawa; On-site; PLN 210,000 - 289,000; Full time

Benefits offered by this job

Dell Laptop

Fringe benefits cafeteria plan

English classes

Training budget

Volunteer day

Hackathons

Company events

Job summary

Allegro.eu S.A. is seeking a Senior Software Engineer to own backend design and delivery for the Allegro One logistics services.

You will work in a hybrid Warsaw-based team handling high-throughput systems using C# and .NET Core, REST APIs, and PostgreSQL, with Docker/Kubernetes in a cloud-native setup. You will lead architectural decisions, ensure performance and reliability, and mentor engineers while collaborating across teams.

Qualifications

• Extensive experience architecting high-throughput, low-latency backend systems.
• Strong knowledge of C#, .NET Core / ASP.NET Core, and RESTful APIs.
• Proficient with PostgreSQL and Entity Framework Core under high concurrency.
• Experience with Docker, Kubernetes, and cloud-native environments.

Responsibilities

• Own backend design and delivery for Allegro One logistics services.
• Build reliable, scalable services with emphasis on performance.
• Collaborate across teams and mentor engineers.
• Maintain and improve CI/CD and deployment processes.

Skills

C#

.NET Core

ASP.NET Core

REST APIs

PostgreSQL

Entity Framework Core

Redis

Docker

Kubernetes

Azure

English (B2)

Tools

Azure Service Bus

Kafka

CI/CD

Job description

Allegro.eu S.A. is seeking a Senior Software Engineer to own backend design and delivery for the Allegro One logistics services.

You will work in a hybrid Warsaw-based team handling high-throughput systems using C# and .NET Core, REST APIs, and PostgreSQL, with Docker/Kubernetes in a cloud-native setup. You will lead architectural decisions, ensure performance and reliability, and mentor engineers while collaborating across teams.