C#/.NET Backend Engineer — Migration Project (6–12m)

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, 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.