Back-end Developer (Java)

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, chance to influence the direction of the development and opportunity to grow with 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 change lives in Ukraine and around the world by creating technological solutions and products that unleash the potential of businesses and meet users' needs.
Over 500+ KS.Tech specialists work daily in various areas: mobile and web solutions, as well as design, development, support, and technical maintenance of high-performance systems and services.
We believe in innovations that truly bring quality changes and constantly challenge conventional approaches and solutions. Each of us is an adherent of entrepreneurial culture, which allows us never to stop, to evolve, and to create something new.

What you will do :
• Collaborate with development team, Product Owner in real and interesting product tasks;
• Selection and implementation of the necessary tools, technologies, and techniques;
• Designing and implementing architecture of an application;
• Code review and code quality control over formed standards of development;
• Writing efficient code.

Qualifications and experience needed :
• Strong experience with Spring Core, MVC, Security, and Boot (3+ years).
• Hands-on experience with Spring Data and Hibernate (3+ years).
• Solid understanding of microservices architecture.
• Familiarity with Event Sourcing, CQRS, and Domain-Driven Design (DDD).
• Strong understanding and practical application of SOLID principles and design patterns.
• Proven experience in developing RESTful services (3+ years).
• Practical experience working with messaging systems such as ActiveMQ or JMS.
• Excellent knowledge of relational databases (MySQL, PostgreSQL, Oracle).
• Experience with non-relational databases (e.g., Cassandra).
• Proficiency with Git and branch-based workflows.
• Experience in setting up and maintaining Docker containers in production environments.
• Understanding of continuous integration principles and tools.
• Experience with unit testing frameworks such as JUnit and Mockito.

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
• 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