Full Stack Developer (.NET / React)

Engenious; Kraków; Hybrid; PLN 140,000 - 210,000; Full time

Benefits offered by this job

Private Medical Care

Co-funded Multisport Card

Training or certification subsidies

Job summary

Engenious in Kraków is seeking a Full Stack Developer to build and maintain modern, cloud-ready applications using .NET and React. You will work on backend services, REST APIs, frontend pages, and data flows in a microservices architecture.

The role is hybrid with two days per week in the Kraków office. You will collaborate with product owners, UX designers, and QA teams, applying best practices in testing, CI/CD, and code reviews.

Qualifications

• Proficient in C# and .NET (ASP.NET Core) with REST API experience.
• Experience with React, TypeScript, and Material UI.
• Experience building and consuming REST APIs.
• Experience with PostgreSQL or other relational databases.
• Knowledge of Entity Framework Core and SQL optimization.
• Experience with Redux Toolkit or similar state management solutions.
• Familiarity with Docker and containerized development environments.
• Understanding of software engineering best practices, including testing, code reviews, and CI/CD.

Responsibilities

• Build frontend applications using React and TypeScript.
• Develop and maintain backend services using C# and .NET.
• Design and implement REST APIs and real-time communication solutions.
• Develop and optimize data access using PostgreSQL and Entity Framework Core.
• Work with event-driven architectures using Apache Kafka.
• Participate in architecture discussions, code reviews, and technical design activities.
• Troubleshoot and resolve issues across the full application stack.
• Collaborate with Product Owners, UX designers, AQAs and other engineering teams.

Skills

C#/.NET

React

TypeScript

Material UI

REST APIs

PostgreSQL

Entity Framework Core

Redux Toolkit

Docker

CI/CD

WebSockets

Tools

Git

WebSockets

Job description

We are looking for a Full Stack Developer who will develop and maintain full-stack applications using .NET and React. Work on backend services and APIs, frontend pages, databases, and real-time systems within a modern microservices architecture. Contribute to the full software development lifecycle, from design and implementation to testing and deployment. This is a hybrid role, with two days per week working from the Kraków office.

Key Responsibilities:

• Build frontend applications using React and TypeScript.
• Develop and maintain backend services using C# and .NET.
• Design and implement REST APIs and real-time communication solutions.
• Develop and optimize data access using PostgreSQL and Entity Framework Core.
• Work with event-driven architectures using Apache Kafka.
• Participate in architecture discussions, code reviews, and technical design activities.
• Troubleshoot and resolve issues across the full application stack.
• Collaborate with Product Owners, UX designers, AQAs and other engineering teams.

Required Skills

• Strong experience with C# and .NET (ASP.NET Core).
• Strong experience with React, TypeScript, and Material UI.
• Experience building and consuming REST APIs.
• Experience with PostgreSQL or other relational databases.
• Knowledge of Entity Framework Core and SQL optimization.
• Experience with Redux Toolkit or similar state management solutions.
• Familiarity with Docker and containerized development environments.
• Understanding of software engineering best practices, including testing, code reviews, and CI/CD.

Nice to have

• Experience with Apache Kafka, event-driven systems, or messaging platforms.
• Experience with WebSockets and real-time applications.
• Knowledge of microservices architectures.
• Knowledge of API security, authentication, JWT, etc.
• Experience with GIS, mapping, or data visualization technologies such as MapLibre, deck.gl, or ECharts.
• Experience with NoSQL time-series databases.
• Background in the energy domain.
• C#
• Entity Framework Core
• OAuth 2.0
• FluentValidation

Frontend

• React 19
• TypeScript
• Material UI (MUI)

Tools & Infrastructure

• Docker
• Git
• WebSockets

What can you expect

• Team of passionate people who love what they do.
• Opportunity to learn and grow.
• Private Medical Care - INTER Polska.
• Co-funded Multisport Card.
• Possible training or certification subsidies.