Senior Xamarin Developer

Who we are?

We are ITSG - a boutique software house where engineering excellence meets creative problem-solving. Unlike typical corporate environments, we’re a tight-knit team of technical craftspeople who approach each project as a unique engineering challenge. Our developers don’t just write code - they architect solutions that push the boundaries of what’s possible with modern technology.

Working with select clients across Switzerland, Germany, USA, UK, and Poland, we take on sophisticated digital initiatives that require deep technical expertise. From distributed systems to innovative mobile solutions and AI features - we focus on challenges that make developers genuinely excited about their work.

Right now, we’re looking for a Senior .NET Developer to join our team and take ownership of an ambitious mobile-first project. You’ll be working with .NET MAUI and sophisticated backend services, building a next-generation virtual card system that will serve thousands of users. This isn’t just another CRUD application - it’s a chance to architect and implement complex business logic, optimize performance at scale, and work with modern cloud infrastructure.

What makes working at ITSG different? We believe in giving our developers the autonomy to make technical decisions, the time to do things right, and the environment to grow as engineers. No micromanagement, no corporate bureaucracy - just pure, challenging technical work alongside other passionate developers.

Duties And Responsibilities

• Develop and maintain cross-platform mobile applications using .NET MAUI technology
• Design and implement scalable backend services using .NET Core
• Create and optimize SQL queries and database structures
• Implement clean architecture patterns and best coding practices
• Write and maintain comprehensive unit tests
• Conduct code reviews and participate in architectural decisions
• Work closely with UX designers and business analysts
• Troubleshoot and resolve complex technical challenges
• Share knowledge and mentor team members
  
  

Requirements

• 5+ years of commercial experience in C# development
• Strong expertise in mobile development with MAUI/Xamarin
• Experience building and publishing cross-platform mobile applications
• Experience with unit testing and test-driven development
• Strong understanding of object-oriented programming principles
• Knowledge of software design patterns and best practices
• Ability to analyze and refactor existing code effectively
• Polish and English language skills (min. B1)
• Available immediately or within 2 weeks
  
  

Nice To Have

• Experience with .NET Core and backend development
• Advanced knowledge of SQL and database optimization
• Understanding of microservices architecture
• Experience with Microsoft Azure cloud services
• Knowledge of CI/CD pipelines
• Performance optimization expertise
• Mobile app store publication process knowledge
  
  

We Offer

We provide excellent opportunities for professional growth and a competitive compensation package.

• Salary: 140-180 PLN net + VAT per hour (B2B)
• 100% remote or Warsaw office-based work
• Flexible-based employment
• Working on projects for one of the biggest payments/advisory companies globally
• Individuality and independence in action
• Intense self-development working with experienced managers
• Work with an experienced team of experts using the latest tools and technologies
• Individual training and career growth opportunities
• Benefits: English lessons, Multisport cards, private medical insurance, integration events