Java Developer – AI project

Java Developer – AI projectMiejsce pracy: BydgoszczTechnologies we useExpected

• Java
• Apache Kafka
• Redis
• AWS

Optional

• AI

About the project

At Sii, we are looking for a Java Developer to join an innovative AI-driven fraud-prevention initiative delivered together with our global telecom client - a company best known worldwide for its cloud communications APIs enabling voice, messaging, and video at massive scale. You will help build intelligent, high-performance systems that protect millions of end users in real time, working in a diverse, supportive, and technology-focused environment. If you enjoy solving complex engineering challenges and want your work to have real-world impact, this is your place. Apply now and build the future with Sii.

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.

Your responsibilities

• Design and implement new backend services that extend an AI-powered fraud detection platform
• Translate product requirements into scalable technical solutions in close cooperation with product and analytics teams
• Develop high-performance, cloud-ready Java services handling large volumes of real-time events
• Take ownership of features from architecture design through deployment and production monitoring
• Continuously improve system reliability, performance, and detection accuracy using data-driven feedback

Our requirements

• At least 5 years of commercial experience as a Java Developer in complex backend systems
• Hands-on experience with Kafka, Redis, and AWS in production-grade environments
• Solid understanding of distributed, high-throughput, and event-driven architectures
• Experience with multi-threaded applications, RESTful services, and scalable backend design
• Good command of English (B2/C1), enabling effective collaboration in an international team
• Residing in Poland required

Optional

• Experience working with or integrating AI / Machine Learning systems

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

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.

---