Portfolio

Angus Lang

Software Engineering Student @ University of Waterloo

Experience Projects

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Toolkit

Programming Languages

Python
TypeScript
JavaScript
C
C++
C#
Kotlin
SQL

ML & Inference

ONNX Runtime
Transformers.js
PyTorch
pgvector/HNSW
WebAssembly/WebGPU inference

Web Development

React
Next.js
Node.js
Express
Deno
FastAPI
Tailwind CSS
HTML/CSS
REST APIs
Playwright

Tools & Technologies

Git
Docker
Linux/Unix
AWS
Vercel
Railway
Vitest
Stripe
Chrome Extensions (MV3)

Databases

PostgreSQL
Supabase
Prisma
MySQL
MongoDB

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Experience

01 May 2026 — Aug 2026 Enterprise Co-op · Waterloo · Velocity

Founder & Engineer

Insighta

Engineered a real-time semantic clustering engine using max-member cosine similarity with threshold tuning (0.80 → 0.92) to eliminate centroid drift, automatically triggering alerts when 5+ students hit similar course concepts.
Built a 966-line load-testing harness simulating staggered joins, traffic bursts, churn, and adversarial injections, proving platform stability for 138 concurrent users across 611 streamed AI responses.
Architected an asynchronous streaming event pipeline where student POST requests trigger Postgres webhooks to Deno Edge Functions, embedding and clustering queries in real time for live analytics.
Conducted 30+ professor interviews to validate demand, securing a Fall 2026 classroom pilot and earning $15,000 in awards from the Overbeeke Family Entrepreneurship Excellence Award and Velocity Cornerstone Pivot Award.

02 Jun 2026 — Sep 2026 Online tutoring company

Software Engineer

1ON1EDU

Built two production systems for a live tutoring company: a multi-role operations platform managing 13,110 scheduled lessons for 518 users across six roles, and a self-guided math curriculum isolated in a 34-table Postgres schema.
Designed an 8-gate validation suite with an independent first-principles verifier across 84K lines of curriculum, catching 50 duplicate templates and 72 dead parameters.
Replaced static questions with 3,429 parameterized Math.js templates, generating unique numeric variants and dynamically redrawing diagrams through a registry of 28 custom SVG renderers.
Shipped 11 LLM-backed features, including streaming Socratic tutors, homework review, and report generation, guarded by a 7-stage deterministic validation cascade so AI never solely determines a student pass.

03 Dec 2025 — Mar 2026 Velocity-backed · AI & drone

Geospatial Full Stack Developer

Link Horizon Inc.

Built an interactive web application for construction site mapping that displays orthomosaic imagery and elevation data using a modern frontend and a tile-based geospatial backend.
Designed and implemented layer controls and a sidebar UI so users can toggle orthomosaic and elevation layers, adjust opacity and elevation ranges, and manage site and scan selection.
Integrated a third-party satellite base layer and a tile server to provide geographic context and reliable rendering of large geospatial datasets in the browser.
Documented setup, troubleshooting and feature behaviour in an organised docs structure to support onboarding and long-term maintenance.

04 Nov 2025 — Present Beijing

Backend Software Engineer

Beijing Guomeng Tech Co.

Engineered backend crawling infrastructure to ingest Chinese financial news at scale using Python-based batch pipelines.
Designed subject-page driven crawlers to reliably collect, parse and store structured articles into a MySQL database.
Implemented robust logging, date-based filtering and batch processing to support downstream review and publishing workflows.
Collaborated with a startup development team to evolve the data pipeline architecture for long-term scalability and content quality control.

05 Sep 2025 — Present University of · Waterloo

Velocity Campus Ambassador

Velocity

Represent Velocity on campus by promoting startup programs, funding opportunities and entrepreneurship events to students.
Engaged with early-stage founders and student teams, helping connect them to Velocity resources and support networks.
Supported outreach initiatives and events aimed at growing participation in Waterloo’s startup ecosystem.
Acted as a liaison between students and Velocity, strengthening awareness of innovation and venture-building opportunities on campus.

06 2025 — Present Faculty of · Engineering

Engineering Ambassador

University of Waterloo

Represent the Faculty of Engineering by engaging prospective students through tours, panels and outreach events.
Communicate the Software Engineering student experience, academic pathways and co-op opportunities to diverse audiences.
Support recruitment and outreach initiatives by sharing firsthand insights into engineering culture and student life.
Serve as a peer ambassador, helping prospective students make informed decisions about engineering at Waterloo.

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Projects

Infinite Monkeys

Jun 2025 – Jul 2025 · Multi-tenant AI writing SaaS

Supabase
Postgres
Deno Edge
Stripe
ONNX
ProseMirror

Solo-shipped a subscription-billed, multi-tenant AI writing SaaS to paying users — auth, tenant isolation, Stripe, LLM routing and ML inference across three runtimes and four platforms.
Replatformed a Prisma/MySQL monolith onto Supabase Postgres and Deno Edge, cutting the legacy API to 85 lines — only the ONNX inference Deno's sandbox can't host.
Modelled inline AI suggestions as their own ProseMirror node, computing insert positions and rejoining split paragraphs so nothing reaches the document without an explicit accept.

Site Code

Local Dictation

Nov 2025 – Dec 2025 · On-device Chrome extension

TypeScript
Chrome MV3
ONNX
Whisper
Kokoro-82M

Ran Whisper and Kokoro-82M entirely on-device across four isolated browser contexts, coordinated through a 32-message typed protocol to work around MV3 service-worker and audio-context limitations.
Built cross-application text insertion fallbacks for Google Docs, React-controlled inputs, and Drive PDFs using synthesized paste events, native prototype setters, and selection-aware clipboard handling.

Code

Finance News Crawler

Python 3
BeautifulSoup
MySQL
Requests

Engineered a Python pipeline (Playwright/BS4) to automate extraction from 20+ financial sources, normalizing data into a unified schema to increase ingestion throughput, consistency, and automated alerts.
Designed a two-stage MySQL schema separating raw data from draft to ensure system auditability and data integrity.
Implemented batch processing and article-clustering to eliminate data redundancy and optimize search rankings.
Architected an LLM-driven translation and rewrite pipeline for Chinese financial news, incorporating multi-stage validation checks and editorial guardrails to maintain high factual fidelity and mitigate model hallucinations.

Code

Pocket Prof

React 19
Three.js
FastAPI
Smallest.ai
Gemini

Voice-first AI lecture assistant: turn live or uploaded lecture audio into structured notes, pick an AI professor's voice through a 3D character picker, and ask follow-ups by voice with slide-aware answers.

Demo Code

Courts Near Me

React 18
Vite
Google Maps
Routes API
OpenStreetMap
Overpass

Finds the sports courts Google Maps never labels — the tennis, basketball and soccer pitches sitting unmarked inside parks with no listing of their own — by reading OpenStreetMap’s pitch tags through Overpass and tracing each court’s real outline onto satellite view, colour-coded across ten sports instead of dropped as an approximate pin.

Code

3D Solar System

React
TypeScript
Three.js
WebGL

All eight planets, dwarf planets and twenty-plus moons with realistic orbital mechanics and click-to-zoom, built on React Three Fiber with NASA-sourced 2K textures.

Demo Code

Graphily

FastAPI
Desmos API
Gemini
Web Speech
Render

Voice-driven maths grapher that converts spoken equations to LaTeX through Gemini and plots them live in Desmos, with voice commands to add or clear graphs.

Code

Every Recipe

React
Node.js
MongoDB
AWS S3
Cognito
Vercel

Full-stack recipe discovery platform built with a dual-repo architecture, separating a React frontend and Node/Express backend for clean scaling and clear ownership across the stack.

Code

One Word Imposter

HTML/CSS/JS
Android Studio
Render
Play Console

A multilingual social deduction party game where players pass a device to receive secret roles, with one imposter blending in without knowing the hidden word.

Code

Animal10 Classifier

Python
PyTorch
TensorFlow
OpenCV
Gradio

Deep learning model classifying animal images from the Animals-10 dataset. ResNet-50 with transfer learning, plus a Gradio demo for real-time predictions.

Code