01 / PAYMENT ENGINEERING
Kotlin payment terminals
Production terminal apps plus a TCP host simulator that lets QA test independently—without waiting for external environments.
Auckland, New Zealand · Open to opportunities
Senior Kotlin Engineer building mobile, payment and AI-enabled products.
I turn complex systems into dependable products—from production payment terminals and TCP-based test infrastructure to mobile apps used by thousands and self-hosted AI automation.
NZ Permanent Resident
Selected work
Systems that work
outside the demo.
Production engineering, independent products and infrastructure—designed, shipped and maintained in the real world.
02 / ON-DEVICE COMPUTING
Watermelon Ripeness
Offline tap-sound analysis using FFT, frequency, harmonics and decay—all on-device.
6K+ monthly active devices4.8K first opens / 28 days
03 / MARINE NAVIGATION
Sea Chart
Offline vector charts, GPS, anchor watch, weather, AIS/NMEA and collision-risk monitoring.
623 monthly active devices4.43★ Google Play rating
04 / AI INFRASTRUCTURE
From news feed to published video—automatically.
Self-hosted on Proxmox/Debian with dual Tesla V100s and 48GB GPU memory.
Kiwi Lens News ↗Collect→Rank→Write→Voice→Visual→Publish
05 / INDEPENDENT PRODUCT
NZ Driving Theory Test
500 questions, mock exams, progress insights, offline and multilingual.
Experience
Built through
every layer.
Commercial engineering in New Zealand, backed by more than a decade of independent product development.
Senior Android Developer
Shift4 (Previous Smartpay) · Auckland
Production Kotlin payment-terminal development, transaction and terminal-management capabilities, technical problem solving and internal QA infrastructure.
Intermediate Backend Developer
Blackpepper Interactive · Auckland
Backend project delivery, reusable PHP services, testing, performance optimisation and production troubleshooting.
Senior Android Developer
Blueberry Solution · Auckland
Independently designed, built, released and maintained native Android applications, APIs and an online selling platform.
Application Developer
Nurture Family · Hamilton
Android product development, prototyping, testing, infrastructure support and end-to-end technical ownership.
Earlier experience 2010—2017
Lighthouse ECE · Android development and IT systems
Senergy Sport NZ · PHP booking system
Qianfan365 / Amador · Android development and security testing
Yongdong Technology · Unity mobile game development
Huize Chuangwei Technology · C#, PHP, data and security engineering
Capabilities
Product-minded.
Systems-capable.
Strongest in Kotlin and Android, with the breadth to own backend services, infrastructure and product operations.
Mobile engineering
Kotlin, Java, Android, Jetpack Compose, Coroutines, Hilt, Flutter, Dart, native integrations, performance, debugging and release.
Backend & data
PHP, REST and TCP services, HTTP/JSON, MySQL, MariaDB, SQLite, API design and production troubleshooting.
AI-enabled systems
Ollama, Stable Diffusion, ComfyUI, TTS, FFmpeg, automated pipelines, on-device signal processing and LLM engineering workflows.
Infrastructure
Proxmox, Debian, Docker, Nginx, Cloudflare, HTTPS, scheduled jobs, monitoring, backup strategy and self-hosted operations.
Background
Postgraduate Diploma in IT
Whitireia Community Polytechnic · 2017
Algorithm competition
1st provincially · 25th nationally in China
Languages
English · Mandarin
Independent builder
Shipping software under intbr.com ↗ since 2013.
From mobile apps and product websites to databases, deployment and home-lab infrastructure, I stay close to the full lifecycle—and keep products running after launch.
Let’s build something useful