Java Backend Developer focused on Spring Boot, PostgreSQL, automated testing, and CI/CD.

I build backend features end to end: business logic, REST APIs, database migrations, tests, containerization, and deployment workflows. I completed two academic years of project-based software engineering training at T-Education and am currently looking for a Java/Spring backend internship.

Email * Telegram * Saint Petersburg

Backend * Frontend * My backend PRs * My frontend PRs

Java 21 * Spring Boot * Spring Security * PostgreSQL * jOOQ * Flyway * Docker * GitHub Actions * JUnit 5 * Mockito * jacoco

• Implemented JWT-based authentication and role-based authorization.
• Built loan workflows covering origination, interest-rate handling, repayment, and autopay.
• Added service-layer tests with JUnit 5 and Mockito.
• Configured GitHub Actions for pull-request checks, JAR and Docker builds, GHCR publishing, and deployment workflows.
• Made the main contribution to the Next.js 15 and TypeScript web client.
• Contribution: 53 merged PRs - 25 in the backend and 28 in the frontend.

Selected backend work: authentication and authorization * loan module * unit tests * CI/CD

Swift * UIKit * Foundation * Scryfall API

• Built programmatic UIKit interfaces and user flows for booster purchases, opening, card collection, and daily rewards.
• Integrated card, set, price, and image data from the Scryfall API.
• Implemented asynchronous image loading and caching.
• Worked in a three-developer team and contributed 70 of 133 commits.

C++ * Arduino

• Developed an interactive controller for LED animations using Arduino and a shift register.
• Implemented multiple animation modes with button-based switching and debounced input handling.
• Designed the software to simplify adding and customizing new LED patterns.
• Structured the code into reusable components for improved readability and maintainability

• Backend: Java 21, Spring Boot, Spring Security, REST APIs, JWT, OpenAPI, MapStruct
• Data: PostgreSQL, SQL, jOOQ, Flyway
• Testing and delivery: JUnit 5, Mockito, JaCoCo, Maven, Docker, Git, GitHub Actions
• Additional: TypeScript, Next.js 15, Swift, UIKit

• Industrial Software Development at T-Education (2024-2025; 2025-2026)
• iOS Application Development with UIKit and Programmatic UI Layout as part of the Summer School at the Faculty of Computer Science, HSE University.

I'm open to Java Backend internship opportunities.

• Email: sergeev-alexey-a@yandex.ru
• Telegram: @alwwwd