Evgeniy

Evgeniy Popadiuk
Java Developer
LinkedIn | GitHub | Telegram | [open contact info](look above in the "contact info" section) | l2-absolute.com

SUMMARY
Java Developer with 1.5 years of commercial experience on C#/.NET and 5+ years of focused Java practice. Background spans full-
stack development with C#, .NET, TypeScript, and Angular, working on production systems that users actually rely on. Strong Java
expertise backed by continuous deep-dive learning and hands-on engineering beyond work hours, including building and running a
custom Lineage 2 game server (l2-absolute.com). Comfortable across backend and frontend, with a strong preference for backend
systems, clean architecture, and solving problems that don’t have obvious answers.

SKILLS
Backend: Java, Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Hibernate, C#/.NET, Microservices
Frontend: TypeScript, Angular
Databases: MySQL, PostgreSQL, Oracle PL/SQL
DevOps/Tools: Git, Jenkins, Maven, Gradle, Postman
Testing: JUnit

WORK EXPERIENCE
l2-absolute.com - Java Project | 01.03.2025 - Present
• Back-end: implemented password hashing with the Whirlpool algorithm during registration and secure verification during login;
configured stateless authentication with JWT tokens; implemented authorization with Spring Security; configured CORS policies to
restrict API access to trusted domains; developed a custom request-throttling filter to limit requests per IP and reduce the risk of
spam and DDoS attacks; implemented email confirmation for user registration;

• Front-end: developed and maintained the project website and forum using TypeScript and Angular, ensuring a consistent user
interface and smooth interaction with the back-end services.

• Game-server side: Reviewed and modified a large number of configurations for server setup, fixed a significant number of bugs
on both the server and client sides, detached Mammon, Catacombs, and Necropolises from a specific seal in the Seven Signs event,
implemented automatic fishing, and more.

Full-Stack Developer - Medirent Solutions | 02.10.2023 - 14.02.2025
In this position, I worked on several projects involving government systems and registries. My responsibilities included developing
new functionality, improving existing features, redesigning architecture, and enhancing user experience.

• Front-end: Developed new system UI templates, improved existing ones for better intuitiveness and usability, and enhanced the
overall design of systems and registries. Significantly reduced system complexity for users and improved the overall user
experience.

• Back-end: Developed new system functionality, improved existing features, fixed unpredictable behavior and errors, enhanced
system reliability, and reduced the likelihood of human error during incorrect data entry. Refactored architectural approaches to
eliminate the possibility of storing invalid data that did not reflect real-world conditions. Significantly improved the overall system
architecture.