Kostiantyn Shtykov

I am a Java / Full-stack developer with a strong focus on backend development and application security.

I work with Java and Spring Boot, building REST APIs and implementing authentication and authorization using JWT, OAuth2, and Keycloak. I have experience configuring roles, access permissions, resource servers, and integrating backend services with frontend applications.

I also work with React / Next.js and TypeScript, creating clean and user-friendly frontends such as admin panels, user dashboards, forms, and dynamic data-driven pages. For styling, I use Tailwind CSS.

In my work, I follow clean architecture principles and maintain a clear project structure. I prefer stateless solutions, which are well-suited for horizontal scaling. I have experience working with MariaDB, JPA / Hibernate, and Docker in a local development environment.

I can help with:

• backend development using Spring Boot

• authentication and authorization setup (JWT / Keycloak)

• frontend integration with REST APIs

• bug fixing and code refactoring

• role and access management

I am open to both short-term tasks and long-term projects. I value clear requirements, responsibility, and delivering stable, high-quality results.