Shameiz Rangwala

Senior Software Engineer · Full-Stack & AI Product Engineering

shameizrangwala@gmail.com
(415) 218-5554 · New York, NY
linkedin.com/in/shameizrangwala

I'm a full-stack engineer who builds products end to end, from the data model and Python services to React web and mobile clients. At Meta I architected an LLM moderation and enforcement system that decides ~20,000 cases a day at 94% human-validated precision, and led engineering for Community Notes on Threads from zero, where daily contributors grew 18×. I have built software professionally since 2017 and build with Claude Code and Codex.

Experience

Meta

New York, NY · 2021 – Present
Senior Software Engineer, Workstream Lead · Threads Product Integrity Aug 2025 – Present
  • Architected and shipped an LLM moderation and enforcement product from zero: a pluggable, protocol-based Python system that decides ~20,000 cases and takes ~5,000 enforcement actions a day at 94% human-validated precision, cutting median report-to-action from days to under an hour.
  • Designed its data model for cases, labels, and decisions, set up the human review and labeling queues, and built the dashboards policy and operations teams use to monitor it; moved it from an external model to an internal one after comparing the two on human-labeled data.
  • Made it shared platform infrastructure: several teams and use cases onboard in weeks, not months, through configuration and prompts rather than new code.
  • Led engineering for Community Notes on Threads from zero across web (React) and mobile. Built in-app rating and note-writing that cut time to consensus 59 to 14.8 hours, lifting 14-day retention 18.4% to 31.7%, the highest among peer apps; daily contributors grew 97 to 1,790.
  • Own roadmap and prioritization across 4 platform teams plus policy, legal, and operations partners, and mentor 3 engineers.
Software Engineer · Instagram & Threads Integrity Aug 2021 – Aug 2025
  • Launched About This Profile on Threads to 132M users, establishing the app's first reusable cross-platform components.
  • Led engineering for Threads-only accounts, shipping standalone creation, login, recovery, and settings on iOS and Android under a hard EU deadline, plus the integrity controls that unblocked the public Threads launch.
  • Led engineering for election transparency on Instagram across backend, mobile, and web for the Philippines, Brazil, and US midterms, covering accounts responsible for 8 billion civic content views.

Earlier Experience

Coinbase · SWE Intern, Coinbase Prime: Institutional trading features in Go, React, and TypeScript, making investment-vehicle setup 10× faster; FIDO2 authentication.

2021

Amazon · SWE Intern, AWS: Aurora Serverless auto-scaling and a DNS library spanning 100K+ database clusters.

2020

Apple · SWE Intern, Core Siri: Python/Flask microservices parallelizing Siri workflows, improving end-to-end testing times 300%.

2019

Shopify · SWE Intern, Payments: Split-payments to 70K+ merchants on Shopify POS.

2018

Skills

Engineering
Python, React, TypeScript, JavaScript, Node.js, GraphQL, SQL, Java, Go, Hack/PHP, Swift/iOS, Kotlin/Android
Full-Stack
Backend APIs, data modeling, review and labeling tools, dashboards, distributed data pipelines, 0-to-1 product development
LLM & Evaluation
LLM systems in production, eval harnesses against human-labeled data, model comparison, human-in-the-loop review, precision and recall tradeoffs

Education

University of Waterloo

Class of 2021

Bachelor of Computer Science (Co-op)