Build a modern web and mobile product for the fitness industry from scratch — from architecture and code to deployment in the App Store and Google Play.

At Qodeca, we create modern digital products for clients worldwide. We are looking for a Senior Fullstack Developer who is fluent in both .NET backend development and frontend/mobile applications based on React and React Native.

You will join an interdisciplinary team delivering a comprehensive product for a fitness industry client. You will have a real impact on technical solutions, code quality, and how thousands of users utilize the club's services on a daily basis.

The Project You Will Work On

We will design, build, test, and deploy a digital ecosystem for a fitness company, including:

• iOS and Android mobile application

• Web panel for employees

• Backend and integrations

• Complete deployment

Wymagania

What We Expect From You

• Experience: Minimum 5 years of commercial software development experience.

• Backend: Very strong knowledge of C#, .NET Core / .NET 8+, ASP.NET Web API, Entity Framework Core, and SQL Server.

• Frontend & Mobile: Hands-on experience with React, React Native, TypeScript, JavaScript, HTML5, and CSS3.

• Architecture: Practical experience with microservices and cloud-native solutions.

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

• Containerization: Good knowledge of Docker and container workflows.

• Quality & Best Practices: Solid understanding of Clean Code, SOLID principles, and design patterns, along with experience in unit and integration testing.

• AI & Productivity: Practical use of AI programming assistants, e.g., Claude Code, GitHub Copilot, ChatGPT, or OpenAI API.

• Autonomy: Strong sense of ownership, self-discipline, and the ability to work effectively in a remote team.

• Polish language: Fluent proficiency — mandatory requirement.

• English language: Minimum B2 in speaking and writing.

Nice to Have

• Familiarity with Domain-Driven Design (DDD) and CQRS.

• Knowledge of Azure DB and advanced Cloud/DevOps patterns.

• Interest in integrating AI/ML into commercial applications.

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

• Experience publishing and maintaining apps in the App Store and Google Play.

Obowiązki

What You Will Do

• Develop the product end-to-end: Design, build, and maintain backend, web, and mobile solutions.

• Build the backend in .NET: Develop services and REST APIs using C#, .NET 10+, ASP.NET Web API, and Entity Framework Core, working with SQL Server.

• Create frontend and mobile apps: Implement features in React, React Native, and TypeScript, ensuring a consistent user experience across web, iOS, and Android.

• Design cloud solutions: Work with microservices architecture, Azure, and Docker containerization.

• Develop integrations: Connect the system with ABC Fitness, Stripe, and communication/notification services.

• Ensure quality: Apply Clean Code, SOLID principles, and design patterns, while writing unit and integration tests.

• Co-shape the architecture: Participate in design discussions, code reviews, and technical decision-making.

• Leverage AI in daily work: Utilize tools like Claude Code, GitHub Copilot, ChatGPT, or the OpenAI API to boost productivity without sacrificing quality.

• Support deployments: Collaborate on infrastructure configuration, documentation, testing, and mobile app publishing.

Oferujemy

What We Offer

• Compensation:  21000–25000 PLN net + VAT under a B2B contract.

• Paid time off: 26 fully paid days off per year.

• Remote work: 100% remote — a model we used long before it became the standard.

• Real impact: Co-shape the architecture, technical standards, and foundations of a brand-new product.

• Experienced team: Work in an interdisciplinary environment with people who share knowledge and care about quality.

• Modern stack: Projects combining .NET, React, React Native, Azure, cloud solutions, and AI tools.

• Real growth opportunities: 90% of leadership positions at Qodeca were filled via internal promotions.

• Autonomy: Trust, space for decision-making, and ownership of results.

Additional Benefits

• Lux Med private medical care.

• MultiSport card subsidy.

• Team integration events, birthday celebrations, and holiday gifts.

Want to build a product that combines .NET, web, mobile, cloud, and AI? Apply — let's talk.