Senior Java Developer - banking industry (f/m/x)

Technologies we use

Expected

• Java
• Apache Kafka
• PostgreSQL
• SDLC
• Spring
• REST

Optional

• Apache Spark
• AI

About the project

Join a long-term technology initiative within the financial sector focused on building advanced systems that support liquidity forecasting, financial resource optimization, cash management, and strategic decision-making. In this role, you will contribute to the development of high-performance, data-driven applications that process large volumes of business-critical information in real time. Working closely with business stakeholders and engineering teams, you will help design innovative solutions leveraging modern backend technologies, distributed architectures, event-driven processing, and emerging AI capabilities.

Your responsibilities

• Designing and developing scalable full-stack applications based on object-oriented principles
• Translating business and technical requirements into reliable, maintainable software solutions
• Building data processing components, analytical services, and automated tools supporting business decision-making
• Collaborating with internal stakeholders, end users, and cross-functional engineering teams
• Participating in the full software development lifecycle, including architecture, implementation, testing, and deployment
• Developing solutions based on distributed systems, event-driven architectures, APIs, and microservices

Our requirements

• At least 5 years of experience in software development using Java and object-oriented programming concepts
• Strong expertise in relational databases, data modelling, and system architecture design
• Experience building highly available, scalable, and resilient business-critical applications
• Practical knowledge of REST-based services, distributed systems, messaging platforms, and modern development practices
• Openness to working in a hybrid model, including regular presence in the Warsaw office (3 days per week)
• Excellent analytical, problem-solving, and communication skills, along with fluent spoken and written English

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.

This is how we work