Senior Java Developer

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 tasks Designing and developing scalable full-stack applications based on object-oriented principlesTranslating business and technical requirements into reliable, maintainable software solutionsBuilding data processing components, analytical services, and automated tools supporting business decision-makingCollaborating with internal stakeholders, end users, and cross-functional engineering teamsParticipating in the full software development lifecycle, including architecture, implementation, testing, and deploymentDeveloping solutions based on distributed systems, event-driven architectures, APIs, and microservices Requirements At least 5 years of experience in software development using Java and object-oriented programming conceptsStrong expertise in relational databases, data modelling, and system architecture designExperience building highly available, scalable, and resilient business-critical applicationsPractical knowledge of REST-based services, distributed systems, messaging platforms, and modern development practicesOpenness 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 Job no. JOB-J9CLH Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws. Benefits For You Great Place to WorkSolid financial situationContracts with the biggest brandsCentre of internal trainingsMany experts you can learn fromOpen and accessible management teamProfit sharingPassion Sponsorship programRegular integration events and tripsComfortable and well-equipped officesMySii appMedical care