Java Backend Developer

Work Experience

04/2024 — 10/2025

Architected and migrated a monolithic legacy application to a Spring Boot microservices architecture, reducing deployment time by 40%.
Designed an event-driven data ingestion pipeline using Apache Kafka, processing 10k+ messages per second with zero data loss.
Optimized high-traffic PostgreSQL database queries and introduced Redis caching, decreasing average API response times by 300ms.

06/2023 — 09/2023

Developed scalable REST APIs using Spring Boot to support internal reporting dashboards used by 500+ employees daily.
Implemented OAuth2 and Spring Security to secure internal endpoints and manage granular role-based access control.
Wrote extensive unit and integration tests using JUnit and Mockito, achieving 85% code coverage across core modules.

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A real-time collaborative movie voting and matching application built on a microservices architecture.

Developed backend services using Java and Spring Boot for room management, voting flows, and result aggregation.
Built WebSocket (STOMP) features to update live participant status, ready states, and instant movie matches in real time.
Integrated gRPC communication between services to fetch and enrich movie data from external APIs (TMDB, OMDB).
Used Redis for temporary room states, active participant tracking, and voting cache, alongside PostgreSQL to save finished room results.
Implemented JWT authentication with custom Spring Security filters to handle stateless room-level authorization.
Containerized and deployed services using Docker, Caddy (for reverse proxy and automatic HTTPS), and Portainer for container management.

2020 — 2026

Hanoi University of Science - VNU

Issued: 04/2026

Score: 970/990

Issued: 05/2026

Score: 360/400

Java

SQL

Spring Boot

Hibernate

PostgreSQL

Redis

Docker

gRPC

WebSocket