.NET Fullstack Developer (React)

Net

Warszawa, Warszawa

Experis Manpower Group

145 - 165PLN

Net per hour - B2B

Full-time

B2B

Mid

Remote

Tech stack

English

B2

React

regular

TypeScript

regular

JavaScript

regular

Redux

regular

API integration

regular

Jest

regular

Node.js

regular

ASP.NET

regular

Entity Framework

regular

SQL Server

regular

Job description

We are seeking a highly skilled Full-Stack Developer with strong expertise in both front-end and back-end technologies. The ideal candidate will be responsible for modernizing legacy applications, building and enhancing UI components, integrating APIs, and deploying applications to Azure using DevOps practices. A strong understanding of functional programming principles and testing methodologies is essential.

Tasks:

Modernizing Legacy Applications

• Convert class-based components to functional ones using hooks.

• Ensure backward compatibility and performance optimization.

Building and Enhancing UI Components

• Analyze and refactor components from React v16 to React v19.

• Develop responsive interfaces using HTML5, CSS3, SCSS.

• Implement accessibility standards (WCAG, ARIA).

State Management Implementation

• Integrate Context API or Redux for complex state handling.

• Optimize state flows across components.

API Integration

• Connect front-end components to REST APIs using Axios or fetch.

• Handle loading states, errors, and data transformation.

Creating and Publishing NPM Packages

• Build reusable components and package them for internal/external use.

• Configure Webpack or Vite for bundling and deployment.

Testing Responsibilities

• Apply TDD/BDD methodologies using Jest and React Testing Library.

• Use mocks and fakes to simulate API responses and component behavior.

Cloud & DevOps Tasks

• Set up Azure App Services and Functions.

• Configure CI/CD pipelines using Azure DevOps.

Functional Programming Practices

• Use pure functions, immutability, and declarative patterns.

• Apply React Hooks, Higher-Order Components (HOCs), and composition techniques.

Requirements:

Front-end Skills

• React (latest), TypeScript (including generics), JavaScript (ES6+), HTML5, CSS3, SCSS.

• State Management: Context API, Redux or similar.

• API Integration: Axios, fetch.

• Testing: Jest, React Testing Library.

• Build Tools: Vite, Webpack, Node.js.

• Packaging: NPM and creating NPM packages.

• Web Accessibility: WCAG, ARIA (preferred).

• Server-side Rendering: Next.js or experience with SSR, SSG, lazy loading (preferred).

• Functional Programming: Immutability, pure functions, declarative programming, React Hooks, HOCs, functional composition (preferred).

Back-end Skills

• .NET (latest), C#, Web API, Entity Framework Core, LINQ.

• Databases: SQL Server, Cosmos DB (NoSQL).

• Testing: xUnit/NUnit.

• Best Practices: OOP, SOLID principles, IoC, DI, clean architecture, DDD, asynchronous programming, generics.

• Security & Authentication: OAuth, JWT, Microsoft Entra ID (Azure AD), OWASP (preferred).

Offer:

• 100% remote work

• MultiSport Plus

• Group insurance

• Medicover Premium

• e-learning platform

Published: 14.08.2025

Office location