Open to new opportunities

Pham Tan Dat

Backend Java Developer | Spring Boot | REST APIs | Microservices

Backend Java Developer with production experience building Spring Boot-based backend platforms across cloud services, domain registration, and healthcare systems. Strong in REST API design, service lifecycle management, database-backed business workflows, and cross-functional delivery.

🎯 Highlights & Focus

  • βœ“ Improved operational efficiency by up to 40% through automated VM lifecycle and DC migrations
  • βœ“ Reduced duplicated backend logic by 30% by refactoring service lifecycle modules across 3+ domains
  • βœ“ Delivered .VN domain platform with 0 critical post-release incidents
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Skills

Technical stack, domain expertise, and language proficiency.

Technical Skills

πŸ’» Backend Core

JavaJava Core

βš™οΈ Spring Ecosystem

Spring BootSpring MVCSpring SecuritySpring Data JPAHibernateJWT

πŸ—„οΈ Database & Caching

SQLMySQLMongoDBRedis

πŸ—οΈ Architecture & Principles

OOPSOLIDDesign PatternsMicroservicesDDD basicsEvent-driven basics

πŸ“¨ MQ & Integration

Kafka (theory)RabbitMQ (theory)API IntegrationWebSocket

πŸ› οΈ DevOps & Tools

GitGitLab CI/CDJenkinsArgoCDDockerLinuxPostmanJUnit

🎨 Frontend

JavaScriptReactJSNext.jsJSF/PrimeFaces

🀝 Soft Skills

Problem SolvingOwnershipTeam CollaborationRequirement Clarification

Language Skills

English Proficiency β€” TOEIC

Reading / Listening
755/990
Speaking
120/200
Writing
160/200

Selected Projects (Production Systems)

Key systems across domain, cloud, healthcare, and SPA domains β€” all with API + admin portal delivery.

🌐 Domain
.VN Domain Registration & Management System
A production-ready domain registration, management, and compliance workflow system supporting official VNNIC registrar operations.
Key Contributions:
  • Delivered VNNIC-compliant registration, eKYC, renewal, transfer, and compliance workflows
  • Owned backend features from requirement clarification, database/API design, to production release
  • Standardized service-state and resource models across domain registry and internal platforms
Impact:
  • Enabled a successful business launch with 0 critical post-release incidents
Tech Highlights:
  • Designed robust, explicit state machines for complex domain registration lifecycles
  • Built high-performance, compliant REST APIs and integrated secure VNNIC endpoints
πŸ”— Live Systems:
- https://longvan.net/domain
β†’ Worked on core domain registration and compliance workflows
Spring BooteKYCVNNIC ComplianceMySQL
☁️ Cloud
VM Lifecycle & Data Center Migration Automation
Contributed to VM lifecycle automation and seamless data center synchronization and migration workflows.
Key Contributions:
  • Automated VM deployment, resource tracking, and data center migration via Spring Boot REST APIs
  • Standardized virtual machine state models and resource allocations across cloud platforms
  • Implemented secure, automated data synchronization across independent physical datacenters
Impact:
  • Reduced manual engineering effort by approximately 40% and lowered deployment-error risk
Tech Highlights:
  • Optimized database queries and API sync times for live virtualization clusters
πŸ”— Live Systems:
- https://longvan.net/cloud-server
- https://longvan.net/cloud-datacenter
β†’ Worked on cloud VM lifecycle automation and migration sync
Spring BootVM LifecycleDC MigrationREST APIs
βš™οΈ Platform ⭐ Featured
Service Platform Refactoring & Unification
Main backend contributor in a cross-functional team optimizing core service management and subscriptions.
Key Contributions:
  • Refactored core modules for service scaling, plans, upgrades, and renewals across 3+ domains
  • Centralized service-state rules to prevent discrepancies and keep platform alignment
  • Built internal REST APIs and admin control portals for business operations self-service
Impact:
  • Cut duplicated backend business logic by approximately 30%, drastically boosting maintainability
Tech Highlights:
  • Centralized critical validations to prevent billing drift and resource discrepancies
Spring BootRefactoringService LifecycleMongoDB
πŸ₯ Healthcare ⭐ Featured
TRUEDOC β€” Healthcare & SPA Subscription Platform
A multi-tenant healthcare subscription platform managing tracking, link benefits, and service lifecycles.
Key Contributions:
  • Built multi-tenant subscription modules for benefit tracking, enterprise subscription distribution, and account linking
  • Implemented shared business-rule processing for cloud, healthcare, and SPA service lifecycles
  • Shipped internal REST APIs and operations admin dashboards allowing operations self-service
Impact:
  • Reduced domain-specific custom code by approx 25%
  • Saved 5–10 engineering hours per week for internal Operations teams
Tech Highlights:
  • Modeled complex tenant hierarchies and multi-channel resource allocations
πŸ”— Live Systems:
- https://truedoc.vn/
- https://metlife.truedoc.vn/
β†’ Contributed to subscription lifecycle and benefit distribution system
Spring BootMulti-tenantJSF/PrimeFacesREST APIs
πŸ’† SPA ⭐ Featured
SPA Treatment Lifecycle & Migration System
A specialized service lifecycle system adapting core cloud models for SPA treatments and prepaid benefit packages.
Key Contributions:
  • Migrated treatment subscriptions to a new prepaid-to-activated-to-usage lifecycle model
  • Built robust plan usage tracking to ensure accurate benefit consumption and prevent over-usage
Impact:
  • Achieved 100% data integrity with no reported data loss during live production migration transition
Tech Highlights:
  • Wrote secure database transition scripts for legacy SPA system data integration
πŸ”— Live Systems:
- https://longvan.vn/bubbly-spa
- https://admin.saleone.vn/login
β†’ Worked on core treatment lifecycle and data migrations
Spring BootData MigrationTreatment MgmtJSF/PrimeFaces
πŸ’¬ Real-time
Real-time WebSocket Chat Application
A real-time communication platform supporting chat, group messaging, and voice/video call interfaces. Developed during STECH VN internship.
Key Contributions:
  • Developed responsive frontend messaging modules using React, Next.js, and WebSocket
  • Created 10+ reusable, highly performant UI components to speed up delivery
  • Resolved complex real-time connection and message synchronization issues
Impact:
  • Significantly improved real-time communication stability and overall product delivery speed
Tech Highlights:
  • Optimized WebSocket connection state management and payload data integrity
Next.jsReactWebSocketJavaScript

My Journey

From .VN domain registration to cloud infra to multi-domain service unification.

Jun 2024 β€” Present
πŸ’» Backend Java Developer β€” Long Van System Solutions
Developing and maintaining core high-performance business applications:
- Domain & VM Lifecycles: Delivered a VNNIC-compliant .VN domain system with 0 critical incidents, automated VM provisioning (saving 40% manual effort), and standardized state models.
- TRUEDOC & SPA Subscriptions: Built multi-tenant healthcare subscription modules, successfully migrated SPA packages with 100% data integrity, and cut custom code by 25%.
- Business Impact: Cut duplicate logic by 30%, designed unified resource-state validation to prevent billing drift, and owned end-to-end features.
Spring BootREST APIseKYCVM LifecycleMulti-tenant
Sep 2023 β€” Jan 2024
🎨 Frontend Developer Intern β€” STECH VN
Contributed to real-time collaboration frontend systems:
- Real-time Chat App: Developed messaging, voice, and video call interfaces using Next.js, React, and WebSocket.
- UI Engineering: Built 10+ reusable UI components, speeding up release times.
- Bug Resolution: Solved 5+ WebSocket real-time data synchronization issues, improving connection stability.
Next.jsReactWebSocketState Sync
Aug 2021 β€” Oct 2025
πŸŽ“ Bachelor of Information Technology β€” Sai Gon University
Deepened foundational computer science and software development knowledge:
- Coursework covers: Data Structures & Algorithms, Database Systems, Software Engineering, Object-Oriented Programming.
- Maintained academic excellence with a GPA of 3.1 / 4.0, focusing on high-quality backend application patterns.
Java CoreAlgorithmsDatabasesOOP

My Resume

Download or preview my CV directly β€” always the latest version.

πŸ“„ PhamTanDat_BackendDeveloper.pdf
Download CV

About & Contact

Currently looking for Backend Java opportunities.

πŸŽ“ Education

Sai Gon University

GPA 3.1 / 4.0

Bachelor of Information Technology  Β·  Aug 2021 – Oct 2025

Coursework covers: Data Structures & Algorithms, Database Systems, Software Engineering, Object-Oriented Programming, and scalable systems architectures.

βœ‰οΈ
Email
phamtandat655@gmail.com
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Phone
0394 047 655
πŸ“
Location
Ho Chi Minh City, Vietnam
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Website
tandatcorp.id.vn
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