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Jeffreyliu0131/README.md

Kairui Liu

AI Products & Engineering

NUS-ISS MTech in Artificial Intelligence Systems · Penn State Computer Science

I’m a computer science graduate and NUS-ISS MTech AIS student building AI products across product design and technical implementation. My experience spans AI camera product work, voice-system integration, and AI-assisted prototyping. I’m interested in how user needs, business constraints, and system architecture shape what gets built.

Seeking a full-time Singapore internship · March–August 2027

AI Product · Applied AI · Product Engineering

LinkedIn · Product & engineering experience

Product & engineering experience

Lightmeta · Product Intern, App · May–August 2026
Translated a hardware-first strategy into an instant-capture experience for LumaQ. Led two camera effects and iPhone Camera Control through launch, with PRDs, scope decisions, and cross-functional reviews. Selected decisions →

Penn State · Industry-sponsored capstone · August–December 2025
Led the Azure speech pipeline in a three-person work-instruction assistant project. Integrated a model trained by teammates and supported the move from glasses to a laptop prototype under semester constraints. My contribution →

Earlier: mobile OS issue reproduction at Xiaomi and Python debugging support as a Penn State teaching assistant.

Selected projects

01 · ThinkBud — Help the learner do the thinking

I defined a paper-first maths coach using photo input and one-step prompts, and directed AI-assisted implementation. A key question is how to distinguish finishing with help from attempting a new problem independently; the current adult preview makes those stages visible.

Product decisions & iteration · Run the demo

02 · FoodLens SG — Turn restaurant research into a usable choice

The brief came from my own Thai delivery decision in Singapore: discover beyond familiar recommendations without losing confidence. I set the problem and requirements; AI agents implemented the prototype. A search result is only a candidate until missing delivery and budget checks are resolved.

Problem & product choices · Run the demo

03 · DecisionTrace — Review what a code change puts at risk

I defined the requirements and human review workflow for an AI-built release-evidence checker. Deterministic checks inspect declared files and fields; semantic suggestions stay advisory. Its public ThinkBud example shows what the tool found and where the detector falls short.

Inspect the public example · Run the demo

These independent prototypes use AI-assisted implementation. Each repository documents its technical verification and current limits; user outcomes remain to be tested.

More work

  • Stock Portfolio — Exact daily portfolio calculations before optional AI interpretation.
  • Codex Notch — An unofficial macOS companion for noticing actionable coding-task changes.
  • Nianxing · 念行 — Capture a thought, review the draft, and confirm what gets saved.
  • FrameText — My independent camera-effects demo, with palm tracking and consistent preview-to-export behavior.
Other experiments

CodexPulse · Subscription Ledger · Taste Language · Object Museum · One Square Kilometre · Flow Lens

Working with me

My work spans product requirements, interaction design, scope trade-offs, Azure speech integration, and prototype evaluation. I pay particular attention to data flow, component responsibilities, and failure behavior. My independent web projects use AI coding agents extensively; my capstone contribution includes hands-on voice integration. The linked cases make the division of work explicit.

Mandarin · English | Connect on LinkedIn →

Pinned Loading

  1. thinkbud-ai thinkbud-ai Public

    AI maths-coaching prototype: photo input, guided practice, independent transfer and delayed checks. Product decisions and evaluation evidence.

    TypeScript

  2. foodlens-sg foodlens-sg Public

    Restaurant decision assistant for Singapore: compare sources, adjust meal preferences and check missing delivery or budget facts before choosing.

    TypeScript

  3. DecisionTrace DecisionTrace Public

    Review product commitments as code changes. Evidence-linked findings, deterministic checks and explicit human decisions; optional AI stays advisory.

    TypeScript

  4. stock-portfolio stock-portfolio Public

    Understand today's portfolio change with exact calculations and visible data gaps, then request optional AI interpretation. iPhone-first PWA.

    TypeScript

  5. codex-notch codex-notch Public

    Unofficial macOS companion for Codex: see task status and notice approval requests without repeatedly checking.

    Swift

  6. nianxing nianxing Public

    Capture thoughts and tasks, review an editable draft, then confirm what gets saved. Local-first, with optional AI and account sync.

    TypeScript