At ••••••, we work with top international IT companies to help them deliver modern digital products and innovative technologies. We are currently looking for a Mid Fullstack Developer to join a distributed international team working on a modern digital product for the fitness industry.

In this role, you will contribute to the development of backend, web, and mobile solutions using .NET, React, and React Native, working alongside experienced developers in a collaborative remote environment.

Project information:

  • Type of project: IT services

  • Project: International project for a US-based client

  • Work model: 100% remote

  • Budget: 100–130 PLN net/hour – B2B

  • Project length: Long-term

  • Start date: ASAP (depending on the candidate's availability)

Your responsibilities:

  • Develop and maintain backend, web, and mobile solutions

  • Build secure and scalable backend services and REST APIs using C#, .NET, ••••••• Web API, Entity Framework Core, and SQL Server

  • Develop responsive web and mobile features using React, React Native, TypeScript, JavaScript, HTML5, and CSS3

  • Develop business logic and optimize SQL Server database structures

  • Apply Clean Code, SOLID principles, and design patterns

  • Write and maintain unit and integration tests

  • Use AI-assisted development tools such as GitHub Copilot, Claude Code, ChatGPT, or OpenAI API to support development and improve workflows

  • Participate in technical discussions, code reviews, and task estimation

  • Collaborate with developers and other team members within a distributed international environment

  • Create and maintain technical documentation in Polish and English

Requirements:

  • Minimum 3 years of commercial software development experience

  • Strong experience with C# and .NET Core / .NET 8+

  • Experience with ••••••• Web API, Entity Framework Core, and SQL Server

  • Practical experience with React and React Native

  • Good knowledge of TypeScript, JavaScript, HTML5, and CSS3

  • Knowledge of Clean Code, SOLID principles, and design patterns

  • Experience with unit and integration testing

  • Practical experience using AI-assisted development tools such as GitHub Copilot, Claude Code, ChatGPT, or OpenAI API

  • Fluent Polish – mandatory

  • Minimum B2 level of English, both written and spoken

  • Ability to work independently and effectively in a fully remote environment

  • Strong communication and collaboration skills

Nice to have:

  • Knowledge of Domain-Driven Design (DDD) and CQRS

  • Experience with microservices architecture and cloud-native solutions

  • Experience with Microsoft Azure services, such as App Services, Service Bus, Azure SQL, and Azure DevOps

  • Knowledge of Docker and containerization

  • Familiarity with Azure Cosmos DB and Cloud/DevOps patterns

  • Interest in integrating AI/ML into commercial applications

  • Experience in fitness, health & wellness, or other B2C solutions

  • Experience publishing or maintaining applications in the App Store and Google Play

We offer:

  • 100% remote working model

  • Full-time cooperation agreement based on B2B

  • Opportunity to work on an international project for a US-based client

  • Opportunity to work with modern .NET, React, and React Native technologies

  • Collaboration within a distributed international team

  • Opportunity to develop your skills in modern software development and AI-assisted engineering

Recruitment process:

  • Introductory call

  • Technical interview

  • Final decisio