Backend Developer (Java) at kyivstar

Kyivstar.Tech is looking for a Backend Developer to join our Product Development Team. The role has all the advantages of working in a product team — versatile projects, plenty of independence, a chance to influence the direction of development, and an opportunity to grow in the role.   About us Kyivstar.Tech is a Ukrainian hybrid IT company and a resident of Diia.City. We are a subsidiary of Kyivstar, one of Ukraine’s largest telecom operators. Our mission is to transform lives in Ukraine and beyond by creating innovative technological solutions that unleash the potential of businesses while meeting evolving user needs. With over 600 specialists working across diverse domains—from mobile and web solutions to the design, development, support, and maintenance of high-performance systems—we are committed to driving meaningful change. We embrace an entrepreneurial culture that fosters continuous growth, challenges conventional thinking, and inspires the creation of transformative products. What you will do Collaborate with the development team, Product Owner, and Engineering Manager in real and interesting product tasks Selection and implementation of the necessary tools, technologies, and techniques Designing and implementing the architecture of an application Code review and code quality control over the formed standards of development Writing efficient code Qualifications and experience needed Spring: Core, MVC, Security, Boot (2+ years) Microservices architecture understanding + understanding of Event Sourcing, CQRS, and DDD Experience with high-load systems Restful services (REST) dev experience (2+ years) Persistence frameworks: Spring: Spring Data, Hibernate (2+ years) Experience in branch-based workflow (git) Messaging: ActiveMQ / JMS Thorough understanding of RDBS: MySQL, PostgreSQL, Oracle, and non-RDBMS like Cassandra Unit testing with JUnit and Mockito Experience with Docker containers in production (1+ year) Strong understanding | usage of SOLID principles and software design patterns Experience with continuous integration as is (principles, instruments) What we offer Office or remote – it’s up to you. You can work from anywhere, and we will arrange your workplace Remote onboarding Performance bonuses for everyone (annual or quarterly — depends on the role) We train employees with the opportunity to learn through the company’s library, internal resources, and programs from partners  Health and life insurance Wellbeing program and corporate psychologist Reimbursement of expenses for Kyivstar mobile communication