Juwen Lie

Mechanical reliability validation for IP cameras and CCTV — IPX6/IPX7 waterproofing, water-leakage testing, focus/SFR, lens-holder design, antenna and cable routing, acoustics and spring/pin mechanisms — carried from EVT through to mass production, with root-cause analysis using measurements and tolerance stack-up.

Led 6–12 month EVT-to-MP programmes across 2–3 concurrent Wi-Fi projects (1–3 SKUs each), aligning PM, ME, EE, RF, quality, factory, suppliers and customers. Led a team of 2 engineers and mentored 5–7 in NPI, failure analysis, measurement and part approval.

Mint is one app with two halves. Budget is a budget you share like a Google Sheet, with an interface built only for money: a 30-second setup turns take-home pay into needs / wants / savings / investing envelopes, an optional 2-minute quiz assigns one of six money personalities, a live sheet with cell-level merging, warnings at 80%, over the limit or when your pace will overspend (including when someone else's edit tips a category), goals and an investing portfolio with drift and rebalancing. Sharing is local-first and end-to-end encrypted (AES-GCM, key in the link fragment) over ntfy.sh or a self-hostable stdlib relay, with no account. Templates is a live marketplace for Excel / Google Sheets templates: describe a sheet in English or Bahasa Indonesia and Mint AI designs it, tweak it with words (“add column Supplier”), export a real .xlsx with live formulas and a dashboard, then sell it — buyers pay the seller directly through the seller's own Midtrans, Xendit or Stripe checkout (QRIS, e-wallets, VA, cards) or a payment link, with coupons, tracked affiliate commissions, seller insights and Web Push notifications, on a Cloudflare Workers + SQLite Durable Object backend. Since 3.2, expenses, income and holdings can be in any currency and are converted to the budget's currency with daily exchange rates (the original amount is kept); Invest adds a 12-question quiz, personal tips and regional money news; the template studio lives inside Mint as a Marketplace tab where you can also sell your own budget plan or investing mix (shares of income only, never real amounts) and buyers see prices in their own currency; and one Mint account keeps budgets in sync on every device, encrypted on the device before upload (PBKDF2 + AES-GCM, with a recovery code). The first time it opens, Mint asks for a language (English, Bahasa Indonesia, 简体中文 or Español) and a region, and the region sets the currency of new budgets and templates. Both halves share one install, one icon, one light / dark / system theme and that one language (Templates is in English and Bahasa Indonesia), and update themselves in place. Free as a Windows and Mac desktop app, an Android app, an iPhone home-screen app and on the web; the desktop and Android builds are opened and checked on their own systems before every release. Plain HTML/CSS/JS, no build step.

Honest device-health copilot for Mac, Windows, Linux, iPhone and Android. Simple mode by default: one plain-words status, one “Fix everything safely” button (undoable for 3 days) and an optional weekly automatic care switch. Safety-graded storage cleaning where every cleanup sits in a 72-hour Undo Vault with measured before/after receipts; a goal planner (“free 10 GB without touching downloads”); a transparent health score; battery wear forecast, Drain Detective and idle-drainer alerts; a baseline that learns your normal; and a chat that diagnoses from plain words and runs reversible fixes. Desktop apps for Windows, Mac and Linux that open in their own window and keep checking in the background (Python bundled; starts at login), Android and iPhone apps that check the phone itself (storage, memory, battery, heat and uptime, plus battery temperature, health and charge cycles on Android) and point to the built-in fixes, Add to Home Screen on iPhone, or a one-line install; pair a phone with your computer by scanning a QR code. Zero-dependency Python agent + offline PWA, local-only, no telemetry.

Offline-first workspace for hardware/mechanical R&D: NPI task flow, OK/NG/NA review checklists, issue log and one-page project report, 11 calculators (Cpk, x̄ − 3σ, torque window, stack-up, snap-fit, thermal pad, IEC openings, ΔE) and an optional stdlib-only file vault server. Ships with generic demo data; real content loads from a private data pack.

A tiny animated pet that lives on your desktop: 51 animals — land animals walk the taskbar and ride along on your open windows, water animals swim and leap out with a splash, sky animals fly anywhere and perch. Every animal has its own voice and song; pets have moods, grow up from baby to grown-up, catch a little cold when you skip breaks and show the live weather on your desktop. Click to tickle, double-click to open the Hub. Pips Friends: chat, groups and the Pips Community, pet visits, pokes, birthdays and gifts. Arena: turn-based skill battles (best of 1, 3 or 5) — press the skills yourself or switch on Auto and let your pet fight — plus minigames and a shop of hats, wings, moves and arena gear. Underneath, an always-on-top Pomodoro timer with soundscapes, app-usage tracking, a daily 1–5 star score, goals, streaks and history. English, Bahasa Indonesia, 繁體中文 and 简体中文. One-click Windows installer with in-app updates; focus history stays local, social features use the Pips online service.

Python + Playwright assistant for a Windchill-based PLM part-approval (AML) workflow: searches the part, starts the workflow, assigns the project, creates or re-links the approval documents, fills the final or conditional approval form (customer-assigned or not), adds the reviewer, verifies every field and stops before Submit. Four one-click launchers and a step-by-step training deck for new users. v0.1 preliminary release.

Downloadable Windows console (v1.11.18) with a locally bundled controller, serial port chooser, macros and offline demo. Remote by code lets a phone or another PC control the AIRIZ and see its camera through this PC with a 6-digit code, and a PIN-protected on-device Bluetooth remote adds wireless pan, up/down, LEDs and a real motor stop from Android or iPhone (Bluefy). The dashboard shows real device facts: the firmware the AIRIZ reports, a Bluetooth self-test result, live link activity, a camera check that confirms each jog really moved the camera, automatic aim and timing calibration from the camera picture, and a read-only hardware check report. Camera tools add presets, motion detection, a siren and talk / listen through the AIRIZ speaker and microphone. The browser and mobile-web editions remain available.

One home, one free account, four AI apps. GlowLead: give one goal and the AI lead plans it, hands each step to GlowChat or the GlowRoom crew, checks the work against clear done-criteria and reports back. GlowChat: chat with any model (ranked by category), your own persona, images, a usage meter, temporary chats, a Council with a Judge and an Arena. GlowRoom: an AI crew that searches the web, runs code and cites sources, in a warm Glow Studio office. GlowNews: the day's AI news in one place, a new edition twice a day; the same story from many outlets becomes one card with every source, ranked and tagged by topic, with free-AI summaries, a 5-point briefing, “new for you” and one tap to discuss any story in GlowChat. Free AI built in: no keys or setup. Puter, OVHcloud (Llama 3.3 70B, GPT-OSS 120B, Qwen 3.5 397B, Mistral Small), LLM7 and Glow Free back each other up: when one is busy or used up, the next answers the same message, with the AI on your device as the last backup. One avatar in every app opens Profile & settings: name, Puter account, persona, token usage and allowance, privacy and your data. Speaks your language: pick English, Bahasa Indonesia, 简体中文 or 繁體中文 and your region on first open; the region decides which AI models you get (only providers that serve mainland China there, with PIPL consent), plus local prices and privacy notes. Free for guests.

Hazel brings three creator tools under one name and one switcher. Hazel Shorts (formerly Shortcraft): write scenes, add your voice, and export a captioned 1080×1920 explainer with generated music, a post kit and YouTube upload, in English or Bahasa Indonesia. Hazel Sped (formerly Sped): turn your own songs into sped-up, slowed or mashup 9:16 shorts with a CapCut-style editor and MP4 export, fully offline. Hazel Long (the original Hazel): generate a storyboard from a prompt, refine it, package it for every platform — plus a Windows desktop app that auto-cuts silences and filler words with ffmpeg and Whisper. Local-first: no account, and existing projects from the old apps open as they were.

An unofficial Traditional Chinese learning app for 發一光耀. Learners sign in with a free Puter account (progress syncs across devices) or continue as a guest; admins publish lessons, quizzes, handouts and events from a dedicated admin console backed by a versioned content repository. Includes an AI study companion that cites lessons and materials, quizzes, plans and makes flashcards, plus interactive lessons, spaced-repetition review, streaks, a usage guide and offline support. Also available as an Android app (APK download); iPhone users get a guided, free home-screen app, or can sideload the native app with a free Apple ID. Points, giving and chat remain demos; no payments or official certification.

Bachelor research project, Aerospace Engineering, Tamkang University (Jan 2022, advisor Dr. Yang-Yao Niu). Derived the eigenvalues and flux-difference splitting of a time-derivative (Weiss–Smith) preconditioned system for the quasi-1-D Euler equations, then implemented it in a Fortran finite-volume solver (MUSCL reconstruction with Roe’s approximate Riemann solver). Validated on a diverging nozzle with supersonic inflow and both supersonic and subsonic outflow, comparing Mach number, pressure, density, temperature and velocity against the analytical solution and the Roe, Steger–Warming and Van Leer schemes.

End-to-end coordination of water-tank fabrication across Indonesia: schedules, BOM and stock, Bill of Quantity cost models, trash-rack cutting plans, installation cost analysis and pipe installation for new housing — plus Chinese-language coordination with China-based vendors.