Fullstack Developer (.NET + React & React Native)

H2B Group is a consulting company that helps clients automate business processes using AI. They offer projects in industries such as fintech, medtech, edutech, and industrial automation. The company supports IT specialists' career development within a B2B model, providing opportunities to work on innovative projects and gain valuable experience.

• Commercial experience: minimum 3 years for Mid level, minimum 5 years for Senior level.
• Proficiency in C#, .NET Core / .NET 8+, ASP.NET Web API, Entity Framework Core, and SQL Server.
• Strong practical experience with React, React Native, TypeScript, JavaScript, HTML5, and CSS3.
• Knowledge of Clean Code principles, SOLID, and design patterns.
• Daily use of AI programming tools (e.g., GitHub Copilot, Claude Code, ChatGPT, OpenAI API).
• Fluent Polish language (mandatory) and English at minimum B2 level (speaking and writing).
• Self-discipline, good remote work organization, and teamwork skills.

Additional requirements for Senior level:

• Practical experience with microservices, cloud-native solutions, and active architectural design participation.
• Knowledge of Azure services such as App Services, Service Bus, Azure SQL, and Azure DevOps.
• Good knowledge of Docker containerization.
• High autonomy and responsibility for implemented solutions, supporting the team in key technical decisions.

Nice to have:

• Knowledge of Domain-Driven Design (DDD) and CQRS.
• Advanced experience with Cloud/DevOps patterns.
• Experience integrating AI/ML models with commercial applications.
• Experience with B2C products, fitness, or health & wellness industry.
• Previous experience publishing applications on App Store and Google Play.
• (For Mid level) Knowledge of Azure, Docker, and cloud-native approaches.

• Develop end-to-end features including mobile app using React Native, web panel using React, and server-side code in C#/.NET.
• Create services and REST APIs using .NET Core / .NET 8+ and SQL Server.
• Integrate the platform with external systems such as payment gateways and notification services.
• Write unit and integration tests, conduct code reviews, and maintain technical documentation.
• Collaborate actively with the team during deployment processes.

The data administrator is H2B Group Sp. z o.o. based in Gdańsk, Poland. Candidates have rights regarding their personal data access, correction, deletion, restriction, objection, portability, and can file complaints to supervisory authorities. Personal data is processed for recruitment purposes with obligatory data according to Polish Labor Code. Consent-based data processed until consent withdrawal. Data recipients include Just Join IT and other entities involved in recruitment processing.