Senior Net Developer

About the project

You will lead the technical development of a new backend platform serving as the operational core of a nationwide logistics ecosystem. The system will manage complex business logic, large-scale integrations, and communication between multiple systems and applications. As Senior .NET Developer, you’ll play a key role in architecture decisions, performance optimization, and mentoring the development team.

Project duration : approx. 12 months with the possibility of extension.

Please note : After the first three months of cooperation, participation in a standby / on-call rotation (including 24 / 7 availability) will be required.

Tasks

Define and lead the backend system architecture to ensure scalability, reliability, and maintainability

Build and optimize RESTful APIs using .NET 8 and ASP.NET Core

Design and implement complex business logic following DDD principles

Oversee integrations with enterprise systems (REST / SOAP, SAP / WMS, authorization services)

Collaborate on infrastructure setup and DevOps pipelines (Docker, RabbitMQ, Redis)

Ensure system performance and resilience across thousands of concurrent users

Conduct code reviews and provide technical mentorship to junior and mid-level developers

Work closely with the product and operations teams to deliver high-quality, production-ready solutions

Must have

5+ years of professional experience in .NET backend development

Strong command of C#, ASP.NET Core, and REST API architecture

Proven experience designing system architecture and database-based solutions

Advanced knowledge of SQL Server, Entity Framework Core, Docker, and microservices design

Familiarity with caching (Redis), messaging systems (RabbitMQ), and CI / CD pipelines

Strong grasp of coding frameworks (xUnit), and clean code principles

Excellent analytical thinking, communication, and leadership skills

Polish language proficiency at C1 level, English at B2+

Nice to have

Experience with GCP / AWS, Terraform, and monitoring tools (NewRelic, DataDog)

Awareness of API security and cloud best practices

Experience in AI-powered code completion and assistance tools such as GitHub Copilot and Tabnine

Proficiency in modern AI-enhanced IDEs, including JetBrains IDEs, CLion, and Fleet

Familiarity with AI-assisted test generation and debugging tools, such as Qoda

What do we offer?

ambitious, creative, talented & highly experienced team

contributing to projects for clients all over the world

flexible working hours and a possibility to work remotely

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The controller of your personal data is Miquido Spółka z ograniczoną odpowiedzialnością sp. k. with its seat in Krakow, Zabłocie 43a, 30-701 Kraków, Poland (“Miquido”, “We”, “Our” or “Us”). See more