Full Stack .NET Developer (C# / React / TypeScript)

Senovo IT Ltd; United States; Remote; USD 46,000 - 71,000; Full time

Job summary

Senovo IT Ltd is seeking two experienced Full Stack .NET Developers to join an established e-commerce project. You will work remotely with Poland-based requirements, tackling architecture, performance and maintainability improvements across frontend and backend.

Ideal candidates have 5+ years of full-stack experience with C#, .NET/ASP.NET Core, React and TypeScript, plus strong SQL skills and CI/CD knowledge. This is a 100% remote contract (B2B) with ASAP start.

Qualifications

• 5+ years of commercial software development experience in full-stack roles.
• Strong hands-on experience with C#, .NET / ASP.NET Core.
• Frontend development experience with React, JavaScript and TypeScript.
• Experience with Redux, Redux Toolkit or similar state management.
• Solid REST API and backend architecture knowledge.
• Strong SQL skills including query optimisation and relational databases.
• Experience with legacy app modernisation and migrations.
• Ability to identify and resolve performance issues.
• Understanding of software architecture, SOLID, and clean code.
• Experience with unit testing, Git and CI/CD practices.

Responsibilities

• Develop, maintain and enhance full-stack apps using C#/.NET, React and TypeScript.
• Analyse existing apps, understand business logic and improve legacy codebases.
• Support modernisation, refactoring and migration initiatives.
• Identify and resolve frontend, backend and DB performance bottlenecks.
• Design, develop and optimise REST APIs and backend services.
• Improve frontend performance and user experience.
• Refactor tightly coupled components for better maintainability.
• Write clean, testable, reusable code following best practices.
• Collaborate with architects and stakeholders to deliver high-quality solutions.

Skills

C#/.NET

React

TypeScript

Redux

REST APIs

SQL

Unit testing

Git

CI/CD

Polish & English

Tools

ASP.NET Core

Job description

We are looking for 2 x experienced Full Stack .NET Developer with a strong background in C#, .NET, React, TypeScript and modern web application development to join an established e-commerce project. The ideal candidate is a hands-on engineer who enjoys solving complex technical problems, understanding existing systems and improving application architecture, performance and maintainability.

Location

Location: 100% Remote – Poland

Contract

Contract: B2B

Start Date

Start Date: ASAP – ideally next week

Project

Project: E-commerce / Application Modernisation & Migration

Language

Language: Polish & English

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 and 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.

Required Skills & Experience

• 5+ years of commercial software development experience, ideally in full-stack roles.
• Strong hands-on experience with C#, .NET / ASP.NET Core.
• Strong frontend development experience with React, JavaScript and TypeScript.
• Experience with Redux, Redux Toolkit or other state management solutions.
• Solid knowledge of REST APIs and backend architecture.
• Strong SQL skills, including query optimisation and relational databases.
• Practical experience with legacy application modernisation, refactoring or system migrations.
• 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.
• Strong analytical thinking and problem-solving abilities.
• Good communication skills in Polish and English.