Senior .NET Developer

Salary: 900-1300 PLN/day on B2B

Work model: hybrid from Warszawa / Łódź (meetings in the office every two weeks)

Why choose this offer?

• Opportunity to work with modern technologies in the .NET ecosystem
• Strong focus on code quality, ensuring professional development standards
• Involvement in the full development lifecycle — from design and implementation to deployment and maintenance

Project

You will be involved in a project focused on designing, implementing, and deploying high-quality backend solutions using .NET Core, .NET Framework, and MS SQL. The work includes building scalable REST APIs, applying architectural patterns for performance and reliability, and ensuring quality through unit and automated testing. You will also contribute to project design, development, and deployment while collaborating in a modern environment using Jira, Git, and Confluence.

Responsibilities you'll have

• Implementing backend solutions using .NET Core / .NET Framework / MS SQL
• Designing, developing, and deploying scalable REST APIs
• Ensuring code quality by writing unit and automated tests
• Participating in system design, programming, and implementation work
• Collaborating with the team using tools such as Jira, Git, and Confluence
• Applying architectural patterns to build efficient and scalable systems

Expected competences and knowledge

• At least 5 years of experience in backend development (C#, SQL, REST API)
• Advanced knowledge of .NET Framework, .NET Core, and ASP.NET WebAPI
• Strong understanding of architectural patterns for scalable solutions
• Experience in writing automated and unit tests
• Ability to work with project management and collaboration tools
• Good command of English for reading, correspondence, and technical discussions

Nice to have

• Knowledge of MassTransit, NServiceBus, Elasticsearch, and Kubernetes

Technologies you'll work with

• C#
• .NET Core
• .NET Framework
• ASP.NET WebAPI
• REST API
• MS SQL
• Jira
• Git
• Confluence

Client – why choose this particular client from the Jit portfolio?

The company is one of the most innovative and technology-driven banks in Central and Eastern Europe. For years, it has been setting standards in mobile and online banking, with a strong focus on user experience, security, and modern digital solutions. The company invests heavily in technology and people, creating an environment where engineers have real influence on products used by millions of customers. Working with it means collaborating with a client that values long-term partnerships, promotes agile ways of working, and continuously seeks new opportunities to bring innovation into financial services. 

About Jit Team

The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 500 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.