Senior .NET Developer

Quick Facts

• Role: Senior .NET Developer

• Focus: Backend development for fintech and payments

Description

Design and build backend services in .NET (6+) for payment and settlement systems. Develop and maintain REST APIs, participate in architectural decisions and code reviews, and ensure performance, security, and stability. Integrate with external banking/payment providers and mentor junior developers while collaborating with analysts and QA.

Responsibilities

• Design and develop backend services in .NET (6+)

• Build and maintain APIs for payment and settlement systems

• Contribute to architectural decisions and perform code reviews

• Ensure performance, security, and stability of solutions

• Integrate with external systems (banks, payment operators)

• Mentor junior developers

• Collaborate with analysts and the QA team

Requirements

• 5+ years of commercial experience in C# and .NET (including .NET Core/.NET 6+)

• Strong knowledge of ASP.NET Core and REST API design

• Practical experience with Entity Framework and efficient query writing

• Experience with SQL Server or PostgreSQL

• Ability to write unit and integration tests

• Knowledge of SOLID, design patterns, and Clean Code

• Experience working with Git and CI/CD pipelines

• Independence, responsibility for code quality, and good team communication

Benefits

• Real impact on global projects used by teams worldwide

• Remote work with one day per month in the Warsaw office

• Stability and growth: access to cloud certifications, training budgets, and a clear career path

• Private medical care and a sports card