.NET Fullstack

Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!

🔸important note!We’re looking for someone with a notice period of up to one month.

Work mode: hybrid (1 day per week in the office)

Location: Gdańsk or Warsaw.

About the Client

Our client is a major player in the banking sector, developing advanced digital solutions for financial products and internal business processes. You will join an experienced engineering team working in an Agile (SCRUM) environment to deliver high-quality, secure, and scalable software solutions.

What you will do

• Develop software using C# (.NET Framework, .NET Standard, .NET Core, .NET) in accordance with technical documentation

• Implement and maintain frontend applications in React (v18+)

• Analyze and refactor existing codebases, including legacy components

• Design solution architecture and contribute to system-wide technical decisions

• Collaborate closely with Developers, Testers, Analysts, and Product Owners in Agile teams

• Participate in debugging, performance profiling, and optimization activities

What we are looking for

• Strong experience in C# / .NET ecosystem (min. 5 years)

• Solid commercial experience with React (min. 3 years)

• Knowledge of DDD, Clean Code, SOLID principles

• Experience with asynchronous communication patterns and architectural best practices

• Proficiency in T-SQL and SQL Server Management Studio

• Skilled in debugging and performance analysis

• Familiarity with Visual Studio and professional engineering workflows

• Good command of English, both written and spoken (min. B2)

Nice to have

• Experience building views or components for mobile-first applications

• Background in financial sector application development

• Experience in test automation (Postman, Playwright or similar tools)

• Knowledge of WCAG accessibility standards

Perks and benefits

• Comprehensive benefits – enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers

• Flexibility – adaptable working hours and remote/hybrid work options to suit your lifestyle & location

• Career growth – access to professional development opportunities and partnerships with Microsoft, AWS, Snowflake, Salesforce & more

• Global collaboration – work with a diverse, international team

• Innovative environment – be part of a forward-thinking and growth-oriented workplace

• Engaging community – participate in team-building events, hackathons, and CSR initiatives

• A pleasant surprise to start your journey with us in the form of a welcome pack

Recruitment process

• HR call

• Technical interview

• Interview with the dedicated client

• Final decision / feedback

👉 Sounds interesting? Click “Apply” and let’s talk!