Fullstack Developer – Java and React.js

Are you a Java Fullstack Developer with a passion for building modern web applications using React on the frontend? Are you looking to join a global project where your work will truly make an impact? This might be the perfect opportunity for you!

Sii is partnering with a U.S.-based technology company recognized for its cutting-edge observability and monitoring solutions used by some of the world’s largest enterprises. Their scalable, high-performance products help teams ensure system reliability and gain deep operational insights.

You’ll work in an international environment, contributing to the development of powerful, cloud-native solutions. Occasional business trips to the U.S. — including a 2-week onboarding in North Carolina — are a very nice to have, but not mandatory. Ready to level up your fullstack career? Apply now!

Your responsibilities

• Lead the design and development of complex, scalable web solutions using OOP principles and web development technologies such as React (TypeScript), and Spring (Java)

• Be a champion in engineering excellence, which starts from clean, testable code and spans through unit tests

• Go beyond unit tests with the test-first approaches like test-driven development and behaviour-driven development

• Collaborate closely with product managers, architects, UX designers, and other stakeholders to define and implement software functionality, architecture, and system designs

Our requirements

• At least 7 years of experience in software development, with at least 4 years focusing on a commercial software product

• Knowledge of React (TypeScript), and Spring (Java), with a strong understanding of OOP principles and design patterns

• Proficiency with relational databases (e.g., PostgreSQL, Oracle) and ORM frameworks, and familiarity with cloud platforms (e.g., AWS)

• Experience setting up CI/CD pipelines (GitLab CI/CD) and utilizing DevOps practices

• Familiarity with microservices architecture and containerization (e.g., Docker, Kubernetes)

This is how we work on a project

• Continuous Deployment

• Continuous Integration

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 60M 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

Recruitment stages

1 Send your CV

2 Talk to us about your expectations

3 Learn more about our projects and choose the best

4 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 7 500 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. In a survey, as many as 90% of our employees responded that Sii is a great place to work, and 95% of them think we have a great atmosphere here.