Kostiantyn Semenenko
Kostiantyn Semenenko

Fullstack Developer

Actively looking · Member since 23 Jan 2026
Message
Location
United Kingdom
Desired salary
Unspecified
Work preference
Full Time, Internship, Part Time, Temporary
Experience level
Not set

About

Professional summary

I 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

Experience

Career history

Backend Developer Paw Connect

Developed 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

Worked 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

Bachelor of Computer Science, Software Engineering

Varndean College

Courses in Game Development, Computer Science, ICT

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