Expert Fullstack .NET & TS developer

KOIA is a company working on a modern fintech platform built for the Scandinavian market. The project involves a long-term collaboration with a Norwegian client, focusing on backend-heavy development (~65%) with additional architecture, technical analysis, and frontend development using React and TypeScript. The application uses modern technologies and cloud-native architecture including React, TypeScript, NestJS, NextJS, .NET, Node.js, AWS, microservices, and event-driven architecture (Kafka).

Must-have:

• 5+ years of experience as a .NET Developer with TypeScript.
• Excellent development skills in C#.
• Experience building Web APIs and backend services.
• Good understanding of multithreading and parallelism.
• Experience with Entity Framework and/or Dapper.
• Experience with unit testing and mocking.
• Good understanding of microservice architecture.
• Good understanding of event-driven architecture.
• Experience with Git and GitHub.
• Knowledge of the entire CI/CD workflow from development to release.
• Experience with SQL and noSQL databases (preferably PostgreSQL, MongoDB, Redis).
• Experience with .NET 6 or newer.
• Experience with AWS.
• Very good English communication skills (B2+/C1).

Nice to have:

• Fullstack experience with React, NestJS, NextJS.
• Experience with Node.js.
• Knowledge of Domain-Driven Design (DDD).
• Experience with event-driven systems.
• Fintech or product-company background.
• Bachelor's degree in computer science or related studies.

• Collaborate on both the back-end and front-end development of applications.
• Assist clients in transforming their existing applications to a new tech stack.
• Work in a remote-first environment with an expectation to join the team from the Gdańsk office 2 days per week.
• Contribute to the success of cutting-edge technology projects.
• Maintain a client-focused approach and engage in frequent client communication.
• Pay attention to detail and ensure the quality of development work.
• Participate in regular technical and architectural discussions.
• Propose ideas and improvements to technical decisions, architecture, and product evolution.