![Kostiantyn Semenenko](https://jobicy.com/react/themes/app/images/avatar.jpg) Kostiantyn Semenenko # Fullstack Developer Actively looking · Member since 23 Jan 2026 [Message](https://jobicy.com/dashboard-page.md) ShareLocationUnited KingdomDesired salaryUnspecifiedWork preferenceFull Time, Internship, Part Time, TemporaryExperience levelNot set * [Overview](#overview) * [Portfolio 0](#portfolio) * [Services 0](#services) ## About Professional summaryI am a motivated backend developer with strong experience in Java and Spring Boot. I specialize in building scalable, cloud-ready applications that incorporate authentication, geolocation, and real-time services. I am passionate about growing as part of a global engineering team focused on building high-availability systems. My technical expertise includes Java, JavaScript, and HTML/CSS, along with frameworks such as Spring Boot, React, Angular, Node.js, and JUnit. I have hands-on experience with databases like PostgreSQL, MongoDB, and Redis, and I am proficient in cloud and container technologies including AWS, Azure Blob Storage, and Docker. I have developed full-stack applications, including a mobile app called Paw Connect, where I implemented secure user authentication, geolocation-based features, and real-time chat services. I also contributed to an online clothing shop project using Nest.js and Angular, working within an Agile Scrum team. I am committed to writing reliable code and have implemented automated unit and integration tests using JUnit and Mockito. I am comfortable working with CI/CD tools such as GitHub Actions and use tools like Git, Postman, Swagger, VS Code, and IntelliJ to streamline development. I am fluent in English and a native speaker of Ukrainian and Russian. I am eager to leverage my skills and experience to contribute to innovative backend projects and continue my professional growth in a collaborative environment. ## Skills 16 capabilities[Angular](https://jobicy.com/talent/angular.md)[Docker](https://jobicy.com/talent/docker.md)[Flutter](https://jobicy.com/talent/flutter.md)[Git](https://jobicy.com/talent/git.md)[HTML CSS](https://jobicy.com/talent/html-css.md)[Java](https://jobicy.com/talent/java.md)[JavaScript](https://jobicy.com/talent/javascript.md)[Junit](https://jobicy.com/talent/junit.md)[Mobile Development](https://jobicy.com/talent/mobile-development.md)[MongoDB](https://jobicy.com/talent/mongodb.md)[NoSQL](https://jobicy.com/talent/nosql.md)[PostgreSQL](https://jobicy.com/talent/postgresql.md)[Postman](https://jobicy.com/talent/postman.md)[React](https://jobicy.com/talent/react.md)[Redis](https://jobicy.com/talent/redis.md)[Spring Boot](https://jobicy.com/talent/spring-boot.md) ## Experience Career history ### Backend Developer · Paw Connect 2025Developed a full-stack mobile application using Java Spring Boot and Flutter. Containerized backend with Docker for cloud deployment. Implemented secure user authentication with JWT. Created geolocation-based swipe system for matching users. Built real-time chat service with STOMP WebSocket and JWT authentication. Developed automated unit and integration tests using JUnit and Mockito. ### Backend Developer · Online Clothing Shop 2025Worked as part of an 8-member Agile Scrum team. Developed backend using Nest.js with microservice architecture. Implemented user authorization and access control. Integrated NoSQL database for product and user management. Participated in daily stand-ups, sprint planning, and retrospectives to maintain code quality and timely delivery. ## Education Learning history ### Kharkiv National University Of Radio-electronics Sep 2021 – Jun 2025Bachelor of Computer Science, Software Engineering ### Varndean College Sep 2022 – Jun 2024Courses in Game Development, Computer Science, ICT This professional hasn’t added portfolio projects yet. This professional hasn’t listed any services yet.