Sheldon Wang

Sheldon Wang

Staff Engineer · Agentic Systems & AI Infra

Sheldon Wang

I’m Sheldon Wang — I build production AI agent systems at Meta scale. (Staff Engineer, Tech Lead @ Facebook Monetization; ex-Snapchat iOS Lead, top-10 all-time committer)

$5M+/yr saved by agents I’ve shipped · top 3 of 700+ engineers org-wide in coding contribution · 12+ years across iOS, Android, web & backend for 3B+ users.

This site is where I share what I’m learning — bilingual deep-dives on LLMs & agents 3×/week, investment notes, and life experiments.

What You’ll Find Here

Tech Blog Posts

Deep dives into AI agents, system design, iOS development, and the art of building software that millions love. From multi-agent orchestration patterns to performance optimization tips that actually work. New to the AI series? Start with the AI & Agents collection.

Investment & Finance

My thoughts on markets, money, and making sense of the economic chaos around us. Expect data-driven analysis mixed with just enough skepticism to keep things interesting. Warning: may contain unpopular opinions about crypto.

Life & Interests

The fun stuff! Productivity hacks that don’t suck, life experiments worth trying, and whatever random rabbit holes I’ve fallen down lately. Think of it as the place where professional meets personal (and occasionally weird).

Playground

Interactive demos and experiments – because sometimes you need to see code in action rather than just read about it. Come here when you want to break things in a safe environment.

Browse Posts by Tags

Explore all content organized by topics and themes. Perfect for finding posts on specific subjects like AI agents, iOS development, finance strategies, or productivity tips.

Who Am I?

The Professional Side

Current Role: Staff Software Engineer, Tech Lead at Meta (June 2025 - Present) — Facebook Monetization

  • Building production AI agent systems: self-evolving multi-agent pipelines, schema-constrained handoffs, node/graph-based agent architectures supporting 100+ engineers
  • Applied impact: AI exploration agent driving 0.01%+ revenue lift · deadcode codemod agent saving $5M+/yr · ObjC→Swift migration codemod (30k+ LOC in 3 months)
  • Rated Greatly Exceeds; ranked top 3 of 700+ engineers org-wide in coding contribution
  • Led ads post-rendering reliability ($20–40M revenue protected); drove org Swift adoption from 5% to 50% of new code

Previous: iOS Lead at Snap Inc. (March 2019 - June 2025)

  • Led Memories team serving 150M+ iOS daily users
  • Backup stack rewrite → $10M+/yr infra savings; cut P90 image latency 40%, video latency 60%
  • Led Matcha: 200K-line architecture refactor (10 engineers, 30+ teams)
  • Technical Excellence Award (company-wide); mentored 5+ engineers to E5 promotion

Earlier: Senior iOS Engineer at BMW (connected car platform) and Citi Mobile (banking)

  • Shipped connected-car experiences, cross-platform features, and banking apps for millions

The Real Me

I’m the guy who:

  • Gets genuinely excited about elegant system architecture
  • Spends too much time optimizing workflows (guilty!)
  • Thinks the best conversations happen over good food and bad puns
  • Believes in sharing knowledge – hence this site!

My Superpower

Taking complex technical concepts and making them actually understandable. Whether that’s multi-agent orchestration, iOS memory management, or why your investment portfolio allocation might need rethinking.

I build systems that scale to billions, and write content that helps people level up. That’s the goal here.

What I’ve Been Up To

Recent Highlights:

  • Building production multi-agent systems at Meta (self-improving agent loops, agent infra & CI reliability)
  • Publishing bilingual deep-dives on LLMs & AI agents 3×/week (LinkedIn + this blog)
  • Tracking AI infrastructure & datacenter trends (the 800V DC rabbit hole runs deep)
  • Training 4×/week, cutting toward 175 lbs – the cut is documented, the snacks are not

Fun Stats:

  • Production agent systems supporting 100+ engineers’ workflows
  • $5M+/yr saved by a single codemod agent I built
  • 150+ A/B tests led (up to 200k LOC in a single test)
  • Top-10 all-time Snapchat iOS committer · Top 3 of 700+ engineers org-wide at Meta
  • 5+ engineers mentored to E5 promotion

Let’s Connect

Found something useful? Disagree with my investment thesis? Built something cool inspired by a post? I’d love to hear about it!

Where to find me:

By The Numbers

  • 12+ years software engineering (iOS depth, now agents & AI infrastructure)
  • 3B+ users reached through products I’ve built
  • $5M+/yr saved · 0.01%+ revenue lift from agent systems I’ve shipped
  • 200K+ lines refactored in major architecture projects
  • 60% reduction in video latency (Snapchat Memories)
  • 150M+ daily users served by features I’ve led

Thanks for stopping by.