We are looking for an experienced Senior Java Developer to join a team responsible for building and developing modern backend systems in a distributed environment. The projects involve high-performance and scalable solutions used in the financial sector, with a focus on processing large volumes of data and microservices architecture.Your tasksDesigning and developing backend systems based on JavaCreating and evolving a microservices architectureBuilding and maintaining REST APIs and system integrationsDesigning solutions that meet high availability and performance requirementsWorking with systems that process large volumes of dataCollaborating with the team using Agile methodologiesParticipating in architecture design and technical decision-makingImplementing and optimizing CI/CD processes and ensuring system securityRequirementsMinimum 10 years in software developmentVery good knowledge of Java (backend) and SpringStrong understanding of REST APIs, HTTPS, microservices, and message queues (MQ)Ability to design high-availability, scalable, and high-performance systemsVery good knowledge of relational databases (SQL)Familiarity with CI/CD pipelines and Agile ways of workingKnowledge of distributed systems and data processingHands-on work with Kubernetes and cloud platforms (GCP preferred)Fluent Polish and English requiredResiding in Poland requiredNice-to-have requirementsKnowledge of Go, Rust, or similar system-level languagesExperience with NoSQL and analytical databases, e.g., ClickHouseFrontend development experienceFamiliarity with the banking sector (trade lifecycle, FX, post-trade processing)Banking experience / FX experience (forex)Working from the office in Krakow 6 times per monthWhat 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 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 If you want to work on systems with high operational significance — apply now!
Sii is a company recognized as a "Great Place to Work" since 2015, thanks to employee feedback and the implementation of new ideas. Established in 2006, Sii has demonstrated financial stability with a revenue of 2.1 billion PLN and no debts. The company shares its profits with employees, having allocated over 76 million PLN for this purpose since 2022. Sii offers a rich benefits package, including private healthcare, a cafeteria platform, and discounts on cars. Employees can work in comfortable A-class offices or remotely. Sii is involved in numerous fascinating projects for prestigious global brands and invests 1 million PLN annually to support employee passions and volunteer actions. The company emphasizes personal development through meetups, webinars, a training platform, and a technology blog. Sii is characterized by a fantastic atmosphere created by its "Sii Power People."
