C#/.NET Developer (3 months)

Sourceful Information Technology Services; Polska; On-site; PLN 120,000 - 180,000; Full time

Job summary

Sourceful ICT, part of IG&H, is seeking a C# API/.NET Backend Developer for an immediate fixed-term migration project through the end of 2026. You will migrate the existing application to a new technology stack using C#/.NET and RESTful APIs.

Collaborate with product owners, analysts, QA, and other developers to deliver high-quality solutions, participate in architecture discussions, review code, and ensure CI/CD pipelines and documentation are kept up to date.

Qualifications

• 5+ years of experience as a Back End Developer using C#.
• Strong experience with C# / .NET 8+ and SQL Server - T-SQL, reading an existing schema, stored procedures.
• Experience with migration projects.
• Experience developing and consuming REST APIs.
• Understanding of software development principles, design patterns, and object-oriented programming.
• Familiarity with source control systems such as Git.
• Experience working in Agile/Scrum environments.
• Familiarity with AI tools such as Claude or Codex.
• Strong analytical and problem-solving skills.

Responsibilities

• Migrate the existing application to new technology stack using C#/.NET.
• Develop and enhance RESTful APIs and backend services.
• Collaborate with Product Owners, Business Analysts, QA Engineers, and other Developers to deliver high-quality solutions.
• Participate in architectural discussions and technical decision-making.
• Perform code reviews and promote development best practices.
• Troubleshoot, debug, and optimize application performance.
• Contribute to CI/CD pipelines and deployment processes.
• Create and maintain technical documentation.

Skills

C# backend

REST APIs

Agile/Scrum

Problem solving

AI tools

C#/.NET

Tools

Git

SQL Server

Job description

Sourceful ICT, part of IG&H, creates custom applications that help our clients stand out and make an impact. We believe in first understanding our clients to build real partnerships. Our goal is to turn complex business needs into secure, scalable solutions with a focus on user experience. Our development process is a team effort with multiple stages, from identifying key features in the customer journey to creating wireframes and mock-ups. We work with clients to turn these ideas into a clear development plan, ready for building. We are a certified OutSystems partner.

We’re currently looking for a C# API/.NET Developer to join us immediately for a fixed-term migration project (until the end of 2026).

What you will do:

• Migrate the existing application to new technology stack using C#/.NET
• Develop and enhance RESTful APIs and backend services
• Collaborate with Product Owners, Business Analysts, QA Engineers, and other Developers to deliver high-quality solutions
• Participate in architectural discussions and technical decision-making
• Perform code reviews and promote development best practices
• Troubleshoot, debug, and optimize application performance
• Contribute to CI/CD pipelines and deployment processes
• Create and maintain technical documentation

What you will bring:

• 5+ years of experience as a Back End Developer using C#
• Strong experience with C# / .NET 8+ and SQL Server - T-SQL, reading an existing schema, stored procedures
• Experience with migration projects
• Experience developing and consuming REST APIs
• Understanding of software development principles, design patterns, and object-oriented programming
• Familiarity with source control systems such as Git
• Experience working in Agile/Scrum environments
• Familiarity with AI tools such as Claude or Codex
• Strong analytical and problem-solving skills