Scalable Backend Systems
Backend Engineer
Detail-oriented Backend Developer with over 3 years of experience in Fintech systems and API architecture. Currently serving as an R&D Officer specializing in technical research, environment standardization using Docker, and performance benchmarking. Proven track record in architecting secure, 100% accurate financial systems including Core Banking and Pawn Management, with a focus on high-volume transaction reliability and scalable system design. I design and ship practical APIs with strong architecture, clear data flow, and stable performance in production.
Experience
3+
Years building and maintaining backend systems
Projects
3+
Production and personal apps shipped end-to-end
Open Source
2+
Community contributions and tools
Tools I use in real projects
Technology choices centered on stability, speed of delivery, and long-term maintainability.
Hover this row to slow down
PHP
Server-side scripting language.
Laravel
PHP web application framework.
Javascript
Versatile scripting language.
Python
Interpreted, high-level programming language.
TypeScript
Typed superset of JavaScript.
Django
High-level Python web framework.
FastAPI
Modern Python web framework for APIs.
Vue.js
Progressive JavaScript framework.
TailwindCSS
Utility-first CSS framework.
Docker
Containerization platform.
AI & Machine Learning
TensorFlow, Pandas, NumPy, scikit-learn.
MySQL
Relational database management system.
PHP
Server-side scripting language.
Laravel
PHP web application framework.
Javascript
Versatile scripting language.
Python
Interpreted, high-level programming language.
TypeScript
Typed superset of JavaScript.
Django
High-level Python web framework.
FastAPI
Modern Python web framework for APIs.
Vue.js
Progressive JavaScript framework.
TailwindCSS
Utility-first CSS framework.
Docker
Containerization platform.
AI & Machine Learning
TensorFlow, Pandas, NumPy, scikit-learn.
MySQL
Relational database management system.
How I work
Understand the business problem
Before coding, I make sure the requirements and edge cases are clear.
Design for reliability first
I focus on clean architecture, data integrity, and maintainable APIs.
Build with practical trade-offs
I choose tools that solve the problem well and keep the team productive.
Review and improve continuously
I revisit performance, security, and developer experience after shipping.
Learning Roadmap
Currently Learning
Topics I am studying right now to improve code quality, reliability, and delivery speed.
learning.node.1
AI-Assisted Backend Flows
Designing practical AI workflows for operational tooling and backend productivity.
learning.node.2
Infrastructure Automation
Improving deployment consistency with Docker-driven environments and CI pipelines.
learning.node.3
Query Performance Engineering
Benchmarking SQL execution plans and optimizing data access in transaction-heavy systems.
Career timeline
Milestones from hands-on backend development, real business constraints, and continuous improvement.
Summary
- Pawn System: Architected and developed a robust Loan and Pawn Management System using Laravel as the core framework.
- API Architecture: Designed and implemented secure, scalable RESTful APIs to handle complex financial transactions, pawn collateral tracking, and interest calculation schedules.
- API Documentation: Documented the entire RESTful API enabling smoother collaboration with the frontend team and reducing integration bugs.
- Feature Development: Built critical modules for loan origination, repayment tracking, and automated penalty calculations, ensuring 100% financial accuracy.
- Background Processing: Leveraged Redis-backed queues for heavy lifting tasks like batch interest calculations and mass notification sending, preventing system lag during peak hours.
- System Optimization: Optimized database queries and backend logic to support high-volume transactions across multiple branches.
Achievements
- Architected secure, 100% accurate financial systems including Core Banking and Pawn Management
- Specialized in technical research, environment standardization using Docker, and performance benchmarking
- Designed and documented complete RESTful API architecture for seamless frontend integration
- Implemented Redis-backed queue system for high-volume batch processing
Stack
Contributions
Mimic-Mock-Api-Best
Open-source full-stack mock API platform built with FastAPI and Vue 3 for rapid prototyping, API testing, integration testing, and Docker-first internal workflows.
hoysengleang
Source
localnet
LAN-first dev sharing tool that exposes local services across network devices with QR support, optional Cloudflare Tunnel, token auth, and access control rules.
hoysengleang
Source
QuickNotes-Docker
Containerized full-stack notes app using Vue 3, ASP.NET Core 8, SQL Server, Redis, and Docker Compose with secure auth, search, recovery, and admin monitoring.
hoysengleang
Source
Education
Academic foundation that supports practical engineering work and system thinking.
Summary
- Completed core software engineering coursework focused on algorithms, object-oriented design, and database systems.
- Built academic projects using MVC architecture, RESTful API principles, and normalized relational database design.
- Practiced collaborative development through team assignments, code reviews, and project documentation.
- Strengthened software testing, debugging, and requirement analysis skills through practical lab work.
Achievements
- Graduated with strong practical foundation in backend engineering and system design concepts.
- Delivered multiple end-to-end course projects with clear technical documentation and presentation.
- Consistently applied clean coding practices and structured problem-solving in capstone assignments.
- Built confidence in translating business requirements into maintainable software modules.