Full Stack .NET Developer

Quick Facts

• Role: Full Stack .NET Developer

• Project: E-commerce application modernisation & migration

• Work model: 100% Remote (Poland)

• Engagement: Contract (B2B)

• Start: ASAP (ideally next week)

• Languages: Polish & English

Description

Join an established e-commerce project as a hands-on Full Stack .NET Developer. You will develop, maintain, and enhance full-stack applications using C#/.NET, React, and TypeScript while improving application architecture, performance, and maintainability. The role includes analyzing existing systems and supporting modernization, refactoring, and migration efforts.

Responsibilities

• Develop, maintain, and enhance full-stack applications using C#/.NET, React, and TypeScript

• Analyse existing applications, understand business logic, and improve legacy codebases

• Support application modernisation, refactoring, and migration initiatives

• Identify and resolve performance bottlenecks across frontend, backend, and databases

• Design, develop, and optimise REST APIs and backend services

• Improve frontend performance, state management, and overall user experience

• Optimise SQL queries, database operations, and application response times

• Refactor tightly coupled components to improve code structure, scalability, and maintainability

• Write clean, testable, and reusable code following software engineering best practices

• Collaborate with developers, architects, and business stakeholders to deliver high-quality solutions

Requirements

• 5+ years of commercial software development experience (ideally full-stack)

• Strong hands-on experience with C# and .NET / ASP.NET Core

• Strong frontend experience with React, JavaScript, and TypeScript

• Experience with Redux, Redux Toolkit, or similar state management solutions

• Solid knowledge of REST APIs and backend architecture

• Strong SQL skills, including query optimisation and relational databases

• Practical experience modernising, refactoring, or migrating legacy applications

• Experience identifying and resolving application performance issues

• Good understanding of software architecture, design patterns, SOLID principles, and clean code

• Experience with unit testing, Git, and CI/CD practices

• Ability to independently analyse and troubleshoot complex applications

• Good communication skills in Polish and English

Benefits

• 100% remote work (Poland)

• Contract (B2B) engagement

• ASAP start (ideally next week)

• Opportunity to work on e-commerce application modernisation and migration