I’m Walter Sun — a growth engineer and indie builder focused on AI-assisted development, mobile growth, advertising systems, and shipping real products.

I work at the intersection of:

• AI-assisted development — using models as leverage to build faster without lowering quality bars
• Mobile growth — acquisition, retention, and monetization systems that compound
• Google Ads / AdMob — bidding, value signals, and campaign structure under real constraints
• Product experiments — small bets, clear metrics, honest postmortems
• Indie hacking / SaaS — building and shipping apps end to end

This site is where I write long-form essays under Writing, short technical observations under Notes, and keep a living list of Projects.

Find me on X. Website: webopc.space.