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C# .NET API Developer

Sourceful Information Technology Services — Poland · Posted ~1 day ago

Mid Contract

Skills

C# .NET RESTful APIs Backend Development API Migration Application Modernization Software Development Cross-functional Collaboration

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Summary ✨ AI‑Generated

A custom software development organization is seeking a C# .NET API Developer for an immediate, fixed-term application migration project lasting until the end of 2026. Responsibilities include migrating an existing application to a new technology stack, developing and enhancing RESTful APIs and backend services, and collaborating with product, business analysis, QA, and engineering teams.

Highlights

Fixed-term project running until the end of 2026, with an opportunity to contribute to a technology migration and modernization initiative. The role involves backend development, REST API enhancement, and close collaboration with product, business analysis, and quality assurance teams.

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#/.NETDevelop and enhance RESTful APIs and backend servicesCollaborate with Product Owners, Business Analysts, QA Engineers, and other Developers to deliver high-quality solutionsParticipate in architectural discussions and technical decision-makingPerform code reviews and promote development best practicesTroubleshoot, debug, and optimize application performanceContribute to CI/CD pipelines and deployment processesCreate 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 proceduresExperience with migration projectsExperience developing and consuming REST APIsUnderstanding of software development principles, design patterns, and object-oriented programmingFamiliarity with source control systems such as GitExperience working in Agile/Scrum environmentsFamiliarity with AI tools such as Claude or CodexStrong analytical and problem-solving skillsGood communication skills in English