Full-Stack React/.NET Developer (Hybrid)

SINGU; Kraków, Warszawa; Hybrid; PLN 180,000 - 320,000; Full time

Job summary

SINGU in Kraków is seeking a Full stack Developer to join the QRmaint product team. You will focus on React with a strong C#/.NET backend, delivering end-to-end features from API to UI.

You’ll collaborate with the Team Lead, PM and Designer to build reliable, secure software. The role is hybrid, requiring 3 days in the Cracow/Warsaw office, with code reviews and testing as daily practices.

Qualifications

• 3+ years of commercial React development with strong TypeScript.
• Working C# knowledge and ability to ship backend changes.
• Experience designing and consuming REST APIs.
• Working knowledge of PostgreSQL and data modeling.
• Strong testing culture: unit/integration tests.
• Comfort with code reviews and giving actionable feedback.
• Experience with AI-assisted development tools is a plus.
• Communicative English at least B2+, Polish at B2+ are required.

Responsibilities

• Frontend: build UI in React/TypeScript as a core contributor to the rewrite.
• Backend: develop features in .NET/C# and maintain REST APIs.
• Database: work with PostgreSQL queries, indexes and performance.
• Quality: implement tests and participate in code reviews.
• AI: use AI tools to accelerate development and code quality.
• Delivery: collaborate with Team Lead, PM and Designer in Agile ceremonies.

Skills

React & TypeScript

C#/.NET

REST APIs

PostgreSQL

Testing

Code reviews

AI tooling

English (B2+)

Polish (B2+)

Tools

Docker

AWS

CI/CD (GitHub)

GitHub

Job description

SINGU in Kraków is seeking a Full stack Developer to join the QRmaint product team. You will focus on React with a strong C#/.NET backend, delivering end-to-end features from API to UI.

You’ll collaborate with the Team Lead, PM and Designer to build reliable, secure software. The role is hybrid, requiring 3 days in the Cracow/Warsaw office, with code reviews and testing as daily practices.