JJ Teoh
Software Developer
Systems, Infrastructure & Full-Stack Applications
Mechatronics engineer turned software developer. I build reliable systems — from edge device sync engines and financial platforms to compliance infrastructure and developer tooling.
About
I started in mechatronics engineering — designing control systems and working with embedded hardware. That foundation in systems thinking shapes how I approach software: I think in terms of failure modes, data flow, and operational constraints, not just features and frameworks.
Distributed Systems
Building reliable data synchronization, offline-first architectures, and edge computing solutions that work in constrained environments.
Full-Stack Product Engineering
End-to-end application development from database design and API architecture to polished user interfaces and deployment pipelines.
Infrastructure & DevOps
Container orchestration, CI/CD pipelines, monitoring, and the operational tooling that keeps systems running in production.
Featured Projects
Edge Device Sync Engine
Offline-first bidirectional sync between IoT field devices and cloud infrastructure.
Hospitality Management Platform
Unified PMS, POS, and e-invoicing system for hotel operations.
Fitness Coaching Platform
Cross-platform coaching tool with web dashboard, mobile app, and native health integrations.
E-Invoicing Compliance SDK
Published npm SDK for Malaysian e-invoicing with digital signing and rate limiting.
Accounting Analytics with AI Chat
Multi-agent AI system for natural language financial analysis and reporting.
Experience
Back End Developer
Studio20 · Full-time
Bangsar, Kuala Lumpur · Hybrid
- Built e-invoicing compliance system (MyInvois) with document validation, PKI digital signing, and API integration with LHDN
- Developed backend services and REST APIs using NestJS with PostgreSQL and MongoDB
- Implemented role-based access control and multi-tenant data isolation for internal platform
- Set up CI/CD pipelines and established code review workflows for the backend team
Software Developer
ViTrox Corporation Berhad · Part-time
Remote
- Maintain and ship features for internal web application used across business units
- Built cross-platform desktop application for user management using Tauri, Vue, and SQLite
- Implemented offline-first data handling with background sync for desktop tooling
Industrial Trainee
ViTrox Corporation Berhad · Internship
Penang, Malaysia · On-site
- Built full-stack web application for real-time data visualization and IoT device control
- Implemented frontend with Nuxt 3, Quasar, and Tailwind CSS connected to device APIs
- Worked directly with hardware teams to integrate embedded communication protocols
Data Entry
i-SURVY SDN BHD · Part-time
Malaysia · Remote
- Automated report generation workflows using Python scripts and Excel templates
- Reduced manual data processing time through scripted pipelines
Skills & Technologies
Languages
Frontend
Backend
Databases
Infrastructure & DevOps
Tools & Practices
Architecture & System Design
Simplified views of system architectures I've designed and built.
Edge Sync Architecture
Offline-first bidirectional sync with ElectricSQL between field devices and cloud
Multi-App Hospitality Platform
Monorepo with shared typed package connecting PMS, POS, and e-invoicing apps
Multi-Agent AI Analytics
Specialized AI agents with MCP tool integration for financial data analysis
Get in touch!
Have a project in mind, want to collaborate, or just say hello? Drop me a message.