TobyHoang.

SOFTWARE ENGINEER

Software Engineer with 5 years of professional experience in Java, Spring Boot, and distributed backend systems, backed by a solid Computer Science foundation from Hanoi University of Science and Technology (HUST). Demonstrated track record across mission-critical domains, including enterprise banking (loan origination & credit risk), telecommunications (policy & billing management), and fintech platforms. Strong focus on transactional data integrity, high-concurrency processing, database performance tuning, and full SDLC ownership. Pioneer in AI-native software engineering, developing custom MCPs, skills, and automated workflows to rapidly prototype end-to-end production systems.

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Tung Hoang Tho
5+
YEARS
10+
PROJECTS
Based in Hanoi, Vietnam
— About Me

Engineering
systems that
hold under pressure.

Software Engineer with 5 years of professional experience in Java, Spring Boot, and distributed backend systems, backed by a solid Computer Science foundation from Hanoi University of Science and Technology (HUST). Demonstrated track record across mission-critical domains, including enterprise banking (loan origination & credit risk), telecommunications (policy & billing management), and fintech platforms. Strong focus on transactional data integrity, high-concurrency processing, database performance tuning, and full SDLC ownership. Pioneer in AI-native software engineering, developing custom MCPs, skills, and automated workflows to rapidly prototype end-to-end production systems.

Outside of code, I build side projects that scratch personal itches — from a Vietnamese social network to a crypto-reward lottery backend. Always shipping.

5+
Years Experience
10+
Projects Shipped
3
Companies
Mountain Summit Reflection
Featured

Mountain Summit Reflection

01 / 06

— Experience

Where I've worked.

2026-07
Present
Software Engineer
Freelance / Independent Contractor
Hanoi, Vietnam (Remote)

Independent software development focusing on backend systems and digital platforms.

  • Operated as primary backend engineer, partnering directly with international clients and product owners to translate business requirements into technical roadmaps.
  • Owned the end-to-end delivery of high-availability backend microservices, managing cloud deployments, API integrations, and database schemas.
  • Leveraged AI-assisted development workflows across implementation and testing, reducing end-to-end software development time by up to 50%.
2024-07
2026-05
Software Engineer
Integro Technologies
Hanoi, Vietnam

A Singapore-based product company (Aurionpro subsidiary) specializing in enterprise banking solutions.

  • Delivered critical Change Requests (CR) and core feature enhancements for Tier-1 ASEAN banking deployments (VietinBank, Sacombank, LandBank, PNB).
  • Collaborated closely with cross-border Business Analysts, QA, and solution architects to ensure strict compliance with banking regulations and SLAs.
  • Maintained system reliability across mission-critical lending operations, conducting proactive investigations to minimize production incident risks.
2023-04
2024-07
Backend Developer
LIFESUP Technology
Hanoi, Vietnam

A Vietnamese IT consulting and outsourcing firm with Viettel as the major account.

  • Owned the full SDLC for enterprise web platforms, managing requirements gathering, architecture design, and production delivery.
  • Led and mentored a team of 3 backend developers; conducted peer code reviews, enforced clean code standards, and designed relational database schemas.
  • Developed GitLab CI/CD automation pipelines and deployment shell scripts, reducing release turnaround time by 60%.
2021-07
2022-11
Backend Developer
Global CMC
Hanoi, Vietnam

A Vietnam-based outsourcing company primarily targeting English-speaking markets.

  • Engineered scalable RESTful microservices using Java and Spring Boot, translating client business requirements into robust API specifications.
  • Designed relational database schemas, tuned query execution performance, and resolved critical backend defects within Agile/Scrum sprints.
— Projects

Selected work.

GitHub
01
Freelance
2026-07 — Present

Lottery Code Sales

An online scratch lottery and gamified digital platform featuring real-time dynamic probability, dual-currency wallets, and affiliate commission settlements.

Backend Developer**: Owned the full **Software Development Life Cycle (SDLC)**, leading requirements gathering, system architecture, database modeling, implementation, testing, and deployment.
Engineered high-concurrency ticket purchasing logic using **Redis atomic operations** and distributed locking, preventing race conditions and overselling during peak traffic.
Architected an asynchronous event-driven pipeline using **RabbitMQ** with consumer backpressure, decoupling real-time ticket transactions from heavy multi-tier affiliate reward calculations.
Designed a dynamic-probability lottery reveal engine for rounds containing millions of tickets, adjusting win odds in real-time to guarantee zero prize pool deficit.
View project
02
Integro Technologies
2024-07 — 2026-05

Smart Lender

A Corporate and SME Lending and Credit Risk Management platform from Singapore, deployed across major ASEAN banks.

Diagnosed and resolved critical **production issues under tight deadlines**, conducting live debugging and deep **Root Cause Analysis (RCA)** across a 17,000+ Java file codebase to safeguard bank SLAs.
Integrated the lending platform with **client banks' internal enterprise systems**, ensuring seamless data interchange and transactional reliability.
Architected a system-wide **SLA Configuration module**, implementing the **Maker-Checker (Dual-Control)** pattern via Staging-Master data isolation to safely manage high blast-radius credit workflows.
Designed an **asynchronous, non-blocking OCR pipeline** for customer ID verification, leveraging background worker thread pools and webhook callbacks to eliminate server thread starvation.
View project
03
LIFESUP Technology
2023-12 — 2024-07

Sani Terminal

A comprehensive web booking system (bus, ferry, hotel, tour) for a Malaysian client.

Participated across the full **Software Development Life Cycle (SDLC)**, collaborating with overseas clients and Business Analysts from technical design to production delivery of **modular microservices**.
Led 3 backend developers**: designed **PostgreSQL** schemas, standardized **RESTful API contracts**, and implemented database optimization strategies to boost throughput.
Integrated **Stripe** and **iPay88** payment gateways with **idempotent webhook handlers**, guaranteeing transaction reliability.
Developed Shell scripts and **GitLab CI/CD pipelines** to automate testing, deployment, and database backups.
View project
04
Viettel High Tech
2023-10 — 2024-05

Camera AI

An embedded Java backend service running on Android-based AI cameras for automated traffic violation detection for Hanoi Public Security.

Sole Backend Developer**: Architected and developed a lightweight **Java backend server** and embedded **SQLite database** directly running on **Android smart cameras**.
Implemented the centralized configuration dashboard and **dynamic rule-engine logic** to process real-time edge telemetry and traffic violation events.
Overcame severe environment constraints (no physical devices or local emulators): successfully engineered and debugged core features by **remote deployment**, **detailed log instrumentation**, and **deep mental code execution tracing**.
View project
05
Viettel High Tech
2023-07 — 2023-10

V-OCS 4.0

Viettel's largest centralized back-office system managing telecommunications pricing policies and rating business logic.

Maintained and engineered policy and billing calculation features within Viettel's largest centralized administrative back-office system.
Resolved a critical performance bottleneck by partitioning datasets for **multithreaded parallel processing**, significantly improving batch execution time.
Diagnosed and resolved severe system lag caused by deep recursion by refactoring the recursive logic into an **iterative algorithm**.
Proactively discovered and resolved a **system-wide search defect**, restoring search accuracy across the entire management platform.
View project
— Skills

The toolkit.

Programming Languages
Core languages for enterprise backends and full-stack services.
JavaSQLJavaScriptHTML5/CSS3
Frameworks & Technologies
Enterprise dependency injection, microservices, and web frameworks.
Spring BootSpring FrameworkSpring Data JPA/HibernateRESTful APIsMicroservicesJSP/Servlet
Databases & Storage
Relational banking databases, embedded edge storage, and distributed caching.
Oracle 19cPostgreSQLSQLiteRedisMongoDB
Messaging & Distributed Systems
Event-driven message pipelines, consumer backpressure, and concurrency locks.
Apache KafkaRabbitMQDistributed CachingConcurrency Control
DevOps & Tools
Containerization, CI/CD automation, cloud deployment, and system tools.
DockerKubernetesAWS (S3SNS)GitLab CI/CDLinuxGitPostman
AI-Native & Agentic Engineering
Model Context Protocol (MCP), custom agent tools, and accelerated workflows.
Model Context Protocol (MCP)Custom Agent Skills & ToolsMulti-Model OrchestrationAutomated WorkflowsRapid End-to-End Prototyping
Practices & Methodologies
Full SDLC ownership, SQL execution plan tuning, and Agile execution.
SQL Query OptimizationUnit Testing (JUnit/Mockito)Full SDLC OwnershipAgile/Scrum
Tech Stack
Java
Spring Framework
Spring Boot
Spring Security
Microservices
Docker
Kubernetes
AWS
PostgreSQL
Redis
Kafka
Elasticsearch
Linux
Nginx
Git
CI/CD
Prometheus
ELK Stack
SQL
JavaScript
TypeScript
React
REST APIs
Java
Spring Framework
Spring Boot
Spring Security
Microservices
Docker
Kubernetes
AWS
PostgreSQL
Redis
Kafka
Elasticsearch
Linux
Nginx
Git
CI/CD
Prometheus
ELK Stack
SQL
JavaScript
TypeScript
React
REST APIs
Java
Spring Framework
Spring Boot
Spring Security
Microservices
Docker
Kubernetes
AWS
PostgreSQL
Redis
Kafka
Elasticsearch
Linux
Nginx
Git
CI/CD
Prometheus
ELK Stack
SQL
JavaScript
TypeScript
React
REST APIs
Vietnamese
Native
English
Professional Working Proficiency (Technical Documentation, Client Communication)
— Contact

Let's work
together.

Open to senior engineering roles, tech lead opportunities, or interesting freelance work. If you're building something that challenges the ordinary — I'd love to hear about it.

Send a message