El'Cloud
Backend Developer · Java · SpringBoot
This website is a place where I share my work, projects, and experiences as a developer. It's also a way for visitors to learn a little more about me, my technical interests, and my journey in software development.
// developer.json
{
"name": "Hoang Duc Manh",
"role": "Backend Developer",
"stack": [
"Java", "Spring Boot", "Kafka",
"PostgreSQL", "Redis", "Docker"
],
"status": "open_to_work",
"location": "Hanoi, Vietnam"
}
~
About me
Hi, I'm Hoang Duc Manh. I'm a backend developer with a strong focus on Java and Spring Boot. I enjoy building scalable backend applications, designing clean APIs, and applying software engineering principles such as Domain-Driven Design and Clean Architecture. I also have professional experience contributing to a banking integration project between CIC and LPBank using C# and ASP.NET Core. While I'm comfortable working with different technologies when needed, my primary focus and long-term career path are centered around the Java ecosystem. Currently, I'm expanding my frontend skills to grow into a full-stack developer.
tech stack
experience
EnsoAI / DNT Group · 03/2026 - present
Backend Developer
CIC — Credit Information Gateway
Backend integration system connecting LPBank with Vietnam's National Credit Bureau (CIC/NHNN).
Built the API gateway layer handling inbound requests from LPBank, implemented business logic
routing for OUT_xx
message types, and designed the asynchronous processing flow using Kafka for non-blocking
communication between services.
Pet projects
Seeds & Trees — E-Commerce Platform
Full-stack e-commerce platform for buying and selling plant seedlings, built end-to-end without a template. Features JWT authentication, Google OAuth, product browsing, cart management, order processing, and email notifications.
Smart Task Management
Backend system designed from scratch following
Hexagonal Architecture
and DDD principles — Ports & Adapters, rich domain entities, value objects, and custom policies.
Includes domain event-driven cache invalidation, soft delete, JWT with refresh token rotation,
and Testcontainers for integration testing.
StockQuery — VN Stock Analytics API
A deep-dive into SQL performance and query optimization for Vietnam stock market data.
Built production-grade REST APIs using window functions
(LAG,
ROW_NUMBER, CTEs),
JPA Specification for dynamic filtering, and structured observability with
TraceId MDC logging
across all request flows.
contact
Connect with me
I'm currently looking for new opportunities. Whether it's a full-time position, freelance work, or just want to chat — my inbox is always open!