Денис

Denis Denisov
Java Backend Developer
[відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») Kyiv, Ukraine

Profiles
GitHub LinkedIn
github.com/Develop2Den [відкрити контакти](див. вище в блоці «контактна інформація»)

Summary
Java Backend Developer with commercial experience building secure backend applications using Java and Spring Boot.
Experienced with REST APIs, Spring Security, PostgreSQL, Redis, Docker, and production-oriented backend development.

Experience
Chat Your Way Kyiv, Ukraine
Java Backend Developer January 2025 - September 2025
• Restored a legacy backend project by resolving critical startup issues and reconfiguring the development environment.
• Configured PostgreSQL and Redis infrastructure, created environment configuration, and deployed the application.
• Refactored REST controllers to use ResponseEntity, improving API consistency and maintainability.
• Fixed backend defects, maintained legacy code, and implemented new features based on business requirements.
• Collaborated with frontend developers during feature implementation and participated in Agile team meetings.

Key Projects
Personal Financier 2025 – Present
• Designed and developed a secure RESTful backend application using Java 21 and Spring Boot.
• Implemented JWT authentication, refresh token rotation, Redis integration, and secure backend architecture.
• Developed financial management modules including accounts, transactions, budgets, goals, and money transfers.
• Applied production-oriented practices including validation, pagination, optimistic locking, Flyway migrations, and global
exception handling.
LinkedIn Clone 2024
• Developed backend functionality for a LinkedIn-inspired social networking application as part of a four-developer team.
• Implemented user registration, authentication, and REST API endpoints using Java and Spring Boot.
• Developed the "Like" functionality for user-generated content.

Technical Skills
Java Spring Boot Spring Security

Spring Data JPA Hibernate PostgreSQL

Redis REST API JWT

Docker Maven Git

Flyway MapStruct Swagger / OpenAPI

JUnit 5 Mockito

Education
DAN.IT Education Full Stack Software Development
Software Development 08/2022 – 04/2023 02/2024 – 09/2024

Languages
English Ukrainian Russian
A2 (Pre-Intermediate) Native Native