Expert Fullstack .NET & TS developer

Join KOIA and work on a modern fintech platform built for the Scandinavian market.

We are looking for a Mid/Senior Fullstack .

NET Developer to join a long-term project for our Norwegian client. The role is backend-heavy (~65%), with additional involvement in architecture, technical analysis, and frontend development using React and TypeScript.

You’ll work in a collaborative engineering environment where developers actively influence technical decisions, architecture, and product evolution.

Project

The application is built using modern technologies and cloud-native architecture.

• Frontend: React, TypeScript z NestJS, NextJS
• Backend: .

NET and Node.js

• Infrastructure: AWS
• Architecture: Microservices, Event-driven architecture (Kafka)
• Testing: Unit tests, Integration/Process tests (test containers based), E2E Tests (Playwright)
• Databases: PostgreSQL, MongoDB, Redis
• Cloud: AWS
• CI/CD: GitHub Actions

The team focuses strongly on:

• code quality,
• automated testing,
• maintainability,
• minimizing technical debt,
• continuous improvement.

Regular technical and architectural discussions are part of the development process, and every team member is encouraged to propose ideas and improvements.

What We Offer

• Competitive Compensation

• 27-32 EUR/h + paid days off (B2B)

• Alternative higher-rate option available without paid leave

• Remote-first culture with regular in-person collaboration.

• Impact & Autonomy

• You’ll have real influence on technical decisions, architecture, and product development.

• Learning & Growth

• Mentorship opportunities

• Self-development days

• Access to learning resources and tools

• Healthy Work Environment

• We value sustainable work, mature communication, and work-life balance over overtime culture.

• Office Space in Gdańsk

• Our office offers:

• adjustable desks,

• bike parking,

• fully stocked kitchen.

• Meaningful Projects

• You’ll work with innovative companies from the fintech and climate-tech sectors across Scandinavia.