Senior .NET Developer

SKMgroup; Województwo małopolskie; On-site; PLN 254,993 - 339,991; Full time

Benefits offered by this job

Flexible working culture

Company apartments in Europe

Job summary

A software house in Poland is seeking a Senior .NET Developer to design and build scalable backend systems using modern .NET technologies. The role focuses on developing high-performance APIs and distributed systems, requiring 5+ years of experience with .NET/C#. You'll have the opportunity to work in a remote-first, flexible environment with a supportive team culture. Key technologies include Docker, SQL Server, and Azure. This is a chance to contribute to innovative software solutions with real impact.

Qualifications

• 5+ years of experience with .NET / C# in production environments.
• Strong understanding of backend architecture and distributed systems.
• Experience building and scaling REST APIs.
• Solid knowledge of relational databases and data modeling.
• Experience with cloud platforms (Azure preferred).
• Hands-on experience with Docker and CI/CD.

Responsibilities

• Design and build backend services and APIs using .NET.
• Define system architecture, service boundaries, and data models.
• Develop and optimize RESTful APIs for performance.
• Work with SQL Server or PostgreSQL and optimize queries.
• Deploy services in cloud environments (Azure preferred).
• Collaborate with frontend, data, and product teams.

Skills

.NET / C#

Backend architecture

REST APIs

Relational databases

Cloud platforms (Azure preferred)

Docker

CI/CD

Job description

We’re looking for a Senior .NET Developer to design and build scalable backend systems using modern .NET technologies.

You’ll work on high-performance APIs, cloud-native applications, and distributed systems, with ownership over architecture, code quality, and production reliability.

Infra: Docker, CI/CD

Other: REST APIs, distributed systems

What You’ll Do

• Design and build backend services and APIs using .NET (C# / .NET Core)
• Define system architecture, service boundaries, and data models
• Develop and optimize RESTful APIs for performance and scalability
• Work with relational databases (SQL Server or PostgreSQL) and optimize queries
• Build and maintain integrations with external systems and APIs
• Deploy and operate services in cloud environments (Azure preferred)
• Set up and improve CI/CD pipelines and delivery processes
• Collaborate with frontend, data, and product teams on end-to-end solutions

What We’re Looking For

• 5+ years of experience with .NET / C# in production environments
• Strong understanding of backend architecture and distributed systems
• Experience building and scaling REST APIs
• Solid knowledge of relational databases and data modeling
• Experience with cloud platforms (Azure preferred, AWS/GCP acceptable)
• Hands‑on experience with Docker, microservices, and CI/CD
• Ability to make pragmatic technical decisions and take ownership of solutions

Nice to Have

• Experience with Azure services (App Services, Functions, Service Bus, etc.)
• Familiarity with event-driven architectures or messaging systems
• Experience with legacy system modernization or migrations
• Exposure to AI/ML integrations or data-heavy systems

What do we offer you?

• Large freedom and real influence
• No unhealthy competition, team approach to meeting challenges
• Remote-first, flexible working culture
• Company apartments in cool cities across Europe: work and enjoy a memorable getaway

About Us

We are a software house with 18 years of experience and a global portfolio of projects. We help businesses modernize, scale, and innovate through custom software solutions. Our team embraces unconventional ideas and new technologies, delivering solutions with real impact. If you value professionalism, creativity, and a strong engineering culture, you'll feel at home here.