Senior Software Developer

About us Kyivstar.Tech is a Ukrainian hybrid IT company, a resident of Diia.City. We are a subsidiary of Kyivstar, one of the largest Ukrainian telecom operators. Our mission is to change lives in Ukraine and the world by creating technological solutions and products that realize the potential of companies and the needs of users. More than 700 KS.Tech specialists work daily in various fields: mobile and web solutions, as well as design, development, support, and maintenance of high-performance systems and services. We believe in innovations that bring about real positive changes, and we constantly challenge traditional approaches and solutions. Each of us is an advocate of an entrepreneurial culture that allows us to never stop, to develop and create new things.

What you will do Develop high-load distributed middleware and backend applications in the telecom sphere — processing provisioning requests, order data-contents, voice, billing, and tariffication events. Design the architecture of microservice systems, APIs, and new business logic. Write, build, and deploy code, optimize it, and conduct code reviews. Cover solutions with unit, integration, and load tests. Prepare technical documentation. Consult on new and existing systems to coordinate project documentation. Maintain stable service performance.

Required qualifications and experience 5+ years of development experience, with at least 2 years of participation in commercial projects. 2+ years of management experience (processes, projects, or people). Java 8/17 (Concurrency, Parallel, Distributed). Web application development (exchange format — JSON/XML), REST architecture construction. Experience with NoSQL (Cassandra DB) and SQL databases. Understanding of relational database design principles, solid SQL knowledge (Oracle). Database design, writing procedures, functions, jobs/schedulers. Database query optimization (indexing, partitioning). Building ETL processes. Knowledge of CI/CD processes, experience with Maven, Gradle, JUnit, and CI/CD tools. Spring Framework (MVC, Boot, Security), Akka (HTTP, Streams), distributed cache framework, Hibernate. Experience with data exchange brokers (Kafka, JMS brokers). Understanding of distributed systems principles and practical experience with them. Agile development methodologies, knowledge and application of SDLC, Scrum, Kanban, XP, WF. Microservices, SOA, monolith, design patterns, Event Sourcing, CQRS, DDD. Docker stack. Grafana, ELK Stack, Artifactory. English — at a level suitable for negotiations and correspondence.

Will be a plus Technical documentation writing and software support experience. Knowledge of the telecom domain — architecture of billing and provisioning systems, VAS (value-added services), basic understanding of GSM network construction. ETL tools: Apache Airflow, Apache Spark. Database incremental change tools (Liquibase).

We offer Office or remote — you decide. Remote onboarding. Performance bonuses for everyone (annual or quarterly — depends on the role). Training: numerous internal resources and partner programs, own library. Health and life insurance for employees. Wellbeing program and corporate psychologist. Reimbursement of Kyivstar mobile communication expenses.