Senior Backend Developer (.NET/C#)

Quick Facts

• Role: Senior Backend Developer (.NET/C#)

• Cooperation model: Long-term B2B contract

• Work model: Remote/hybrid (occasional project meetings in Warsaw)

Description

You will build new and modernize mission-critical domain applications for a public-sector client, with a strong focus on code quality and engineering best practices. The work includes designing and implementing efficient REST APIs and creating unit and integration tests while collaborating in Agile/Scrum.

Responsibilities

• Develop new domain applications and modernize existing ones

• Continuously improve source code quality and apply good programming practices

• Design and implement efficient REST API interfaces

• Create unit tests and integration tests

• Actively participate in project, working, and status meetings in Agile/Scrum

Requirements

• University degree (mandatory)

• Minimum 5 years of overall experience on IT projects

• At least 3 years as a Backend Developer within the last 5 years

• Experience on IT projects with a value of at least 100,000 PLN net (mandatory)

• Practical knowledge of C# and .NET Core for web and desktop applications

• Ability to design and implement REST APIs

• Strong knowledge and practical use of design patterns and architectures: Clean Architecture, DDD

• Strong knowledge of relational databases (MS SQL, PostgreSQL): SQL query optimization, indexes, stored procedures

• ORM experience: Entity Framework Core, Dapper

• Experience implementing security mechanisms: authentication, authorization, and data encryption (JWT, OAuth2, FIDO2)

• Experience with Azure DevOps and Git version control

• English proficiency to read and write technical documentation

Benefits

• Long-term cooperation under a B2B contract

• Stable multi-month modernization project for critical domain systems at large scale

• Remote work with occasional Warsaw meetings

• Partner-like communication and full technical-organizational support during the contract