Expert / Senior.NET Developer

We’re looking for an Expert / Senior .NET Developer to join a long-term project for a leading client in the banking industry.

Location : Hybrid model – Gdańsk, Warsaw, or Łódź

Contract Type : B2B

Project Type : Enterprise banking systems – backend & API development, code optimization, and mentorship

Responsibilities :

Design, develop, and maintain software solutions

Analyze, refactor, and troubleshoot legacy code

Conduct code reviews and uphold high-quality standards

Collaborate with QA and Business Analysts

Mentor junior developers and provide technical leadership

Must-Have Experience :

Strong knowledge of C# and the .NET framework

Expertise in ASP.NET Core and API development

Experience with SQL Server (design & development)

Ability to work with and troubleshoot legacy code

Solid understanding of OOP and software engineering best practices

Nice-to-Have :

Familiarity with Git, Jenkins, and testing frameworks

Understanding of cloud concepts & web security best practices

Knowledge of frontend technologies (Angular, HTML, CSS, JavaScript)

Tools & Tech Stack :

Visual Studio, Postman, Swagger, Bitbucket, SQL Server Management Studio, T-SQL, Bootstrap (or similar)