Case Studies & Featured Projects
A collection of notable projects I've participated in as Developer, Dev Lead, Team Lead. Each case study focuses on context, challenges, technical solutions, and real results.
Viettel High Technology Corporation
Aug 2020 - Aug 2024
Team lead•20 members
- Discuss, analyze requirements, and come up with solutions to solve problems.
- Write documents describing functions.
- Build projects, design databases.
Java Spring Boot
ZK
Kafka
ActiveMQ
Vernemq
EMQX
VN GREEN EARTH., JSC
June 2021 - Dec 2021
Developer•10 members
- Coding.
- Solution analysis.
- Storing projects in microservices.
Java Spring Boot
Microservice
MariaDB
Redis
Angular
VN GREEN EARTH., JSC
Feb 2023 - May 2023
Dev Lead•6 members
- Customer exchange.
- Analyze requirements, create solutions.
- Divide tasks, review merge code, coding.
Java Spring Boot
Microservice
MariaDB
Redis
Kafka
Angular
EPAY SERVICES JOINT STOCK COMPANY
Aug 2023 - Dec 2023
Dev Lead•8 members
- Customer exchange.
- Set up dev environment (install database).
- Build a microservice base project.
Java Spring Boot
Microservice
Oracle Database 19c
Digilife Vietnam Digital Services Co., Ltd.
Aug 2024 - Mar 2025
Dev Lead•12 members
- Work directly with end users to collect requirements and finalize business processes.
- Design and build a centralized system for sales management, inventory management, and customer management for VNSKY telecom.
- Develop a dedicated web portal for partners to manage SIM stock and perform new subscriber activation.
Java Spring Boot
ReactJS
Oracle Database
Kubernetes (K8s)
Kong API Gateway
Kibana
Digilife Vietnam Digital Services Co., Ltd.
Feb 2025 - Jun 2025
Dev Lead•8 members
- Design and develop a management app dedicated to telecom partners.
- Manage SIM resources, packages, and activate new subscribers.
- Integrate and synchronize data with the BCSS system to control the entire sales lifecycle.
Flutter
Java Spring Boot (BCSS backend)
Oracle Database
Kubernetes (K8s)
Kong API Gateway
Kibana
Digilife Vietnam Digital Services Co., Ltd.
Feb 2025 - Aug 20, 2025
Dev Lead•8 members
- Design and develop an outboard SIM sales website for international travelers.
- Optimize SEO and deliver a mobile-friendly interface.
- Manage orders, product listings, and reconciliation reports for partners.
Java Spring Boot
Redis
Kafka
Oracle Database
NextJS
Kubernetes (K8s)
GREEN EARTH Vietnam IT & Communication JSC
Mar 2025 - Present
Deployment & Operation•5 members
- Deploy and operate the system for managing SIM inventory, number management, order management, and reconciliation reporting to support sales activities for Mobifone.
- Integrate with Mobifone (MBF) and e-commerce platforms such as Shopee, Lazada, and TikTok.
- Manage orders from various sales channels.
Java Spring Boot
Kafka
Redis
ReactJS
Digilife Vietnam Digital Services Co., Ltd.
Jun 2025 - Nov 2025
Dev Lead•6 members
- Design and develop an eSIM sales app for VNSKY, Mobifone, and related services such as topup.
- Build both the mobile app and a CMS for order management, product registration, and sales reporting.
- Integrate with BCSS and GEM systems for effective eSIM sales across the ecosystem.
Java Spring Boot
Kafka
Redis
MinIO
ReactJS
Flutter
Vietnam National Credit Information Center (CIC)
Nov 2025 - Present
Team Lead•26 members
- Discuss and analyze business requirements with clients and stakeholders.
- Manage development team, assign tasks, and track project progress.
- Design and build large-scale credit data processing system.
Java Spring Boot
Apache Cassandra
Oracle Database
ELK Stack (Elasticsearch, Logstash, Kibana)
NextJS
Jenkins