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Денис
Java, SpringBoot developer (Javascript, React)
- Age:
- 47 years
- City:
- Kyiv
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Denis Denisov
Java Backend Developer
[open contact info ](look above in the "contact info" section) [open contact info ](look above in the "contact info" section) Kyiv, Ukraine
Profiles
GitHub LinkedIn
github.com/Develop2Den [open contact info ](look above in the "contact info" section)
Summary
Java Backend Developer with commercial experience building secure backend applications using Java and Spring Boot.
Experienced in developing REST APIs, implementing Spring Security, and working with PostgreSQL, Redis, Docker, and
AI-assisted software 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 AI-assisted Development OpenAI Codex Prompt Engineering
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
Java Backend Developer
[
Profiles
GitHub LinkedIn
github.com/Develop2Den [
Summary
Java Backend Developer with commercial experience building secure backend applications using Java and Spring Boot.
Experienced in developing REST APIs, implementing Spring Security, and working with PostgreSQL, Redis, Docker, and
AI-assisted software 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 AI-assisted Development OpenAI Codex Prompt Engineering
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
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The candidate's resume is posted at https://www.work.ua/resumes/10225623/