Lead Fullstack Engineer (.NET & React)

Knowit is a leading Nordic IT consultancy firm, dedicated to helping our clients achieve their business goals through advanced technological solutions. With over 4,500 professionals across various business areas, we specialize in software development, IT consulting, and digital transformation, all aimed at creating sustainable futures. Knowit is listed on the Stockholm Stock Exchange and operates in 21 countries, providing cutting-edge solutions and exceptional client service.

Project

For our customer, Swedish IT company, we are looking for a Lead Fullstack Engineer to join a cross-functional Scrum team who enjoys having a real say in how things are built. You’ll take ownership of the backend, help refine requirements, and keep the work aligned with both technical and business needs. You will not only be responsible for hands-on coding but also for leading the backend part of the team, collaborating with the frontend and QA, and working closely with the Product Owner and architects to clarify and challenge requirements. This is a great opportunity for someone who enjoys communication, technical ownership, and navigating a demanding but rewarding environment.

We are looking for candidates located in Poland.

Requirements

• C#, .NET Core / .NET 8 (ASP.NET, Entity Framework, MediatR, Swagger, Serilog, SignalR)

• TypeScript / React (RTK, Material UI, react-hook-form, ESLint)

• MS SQL Server / PostgreSQL

• Unit & functional tests: NUnit, xUnit, Moq, FluentAssertions, vitest, jest

• Architecture & design patterns: SOLID, CQRS, DDD

• RabbitMQ

• Kubernetes, Docker

• GitHub Actions (CI/CD)

What we offer

• B2B business contract

• Possibility to work from the office (Warsaw, Łódź, Bydgoszcz), hybrid, or remotely - depending on your capabilities and preferences

• Flexible working hours - you can start your day between 7 and 10

• Organizational culture based on knowledge sharing and feedback

• Possibility to acquire our benefits on preferential conditions

• Necessary equipment for cooperation