Senior Java Developer (f/m/x) w Warszawa, Polska

Senior Java Developer (f/m/x)

Miejsce pracy: Warszawa

Technologies we use

Expected

• Java
• SDLC
• Docker
• Kubernetes
• GitHub Copilot

Optional

• AWS
• Devin AI
• Claude (Anthropic)

About the project

Join an international technology team delivering solutions for a leading financial institution operating in the capital markets sector. In this role, you will contribute to the development of a large-scale platform supporting the processing and completion of financial transactions. Working within a distributed engineering environment, you will help modernize critical systems through cloud technologies, automation, and AI-assisted software development practices. This position offers the opportunity to collaborate with both technical and business stakeholders while building highly available, enterprise-grade solutions.

Your responsibilities

• Designing, developing, and enhancing cloud-based backend services supporting transaction processing platforms.
• Taking ownership of selected system components throughout their entire lifecycle, from architecture and implementation to production support.
• Leveraging AI-powered development tools to accelerate software design, specification, and coding activities.
• Collaborating with business and operational teams to improve efficiency through automation and technology-driven solutions.
• Contributing to the reliability, scalability, and performance of distributed systems operating in a global environment.
• Supporting continuous improvement initiatives related to software delivery, monitoring, and operational excellence.

Our requirements

• At least 5 years of professional experience in backend software development using Java.
• Strong knowledge of modern application frameworks, event-driven architectures, and microservices development.
• Hands-on experience with containerization and orchestration platforms in cloud-native environments.
• Familiarity with CI/CD practices, source control systems, and modern software delivery processes.
• Strong analytical and problem-solving skills combined with attention to quality and detail.
• Fluent English and willingness to work in a hybrid model, including regular office presence three days per week.

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People

This is how we work on a project

• Continuous Deployment
• Continuous Integration

Recruitment stages

• Send your CV
• Talk to us about your expectations
• Learn more about our projects and choose the best
• Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.