Shuo Yu Lin

Indie hacker shipping real products end to end: AI voice agents, an AI trading-signal service, a marketplace SaaS, pet-tech AI, and a persona/digital-twin tool. Building in public, sharing the real wins and the real bugs.

Products

CallChatSyn
Voice AI SaaS — Member pricing from $1.90/mo (save 39% yearly). Live Stripe billing across 4 real-checkout-verified signup paths.
2026 — present
QuantGold AI
AI 5-minute XAU/USD pre-signal SaaS — Member pricing from $9.90/mo (67% off). Risk-capped sizing, live Stripe billing.
2026 — present

Recent activity

80+ people used a feature I never announced. Here's what I learned.

I built a tool that finds where your first customers are asking. 48 signups, 0 paying. Here is what happened when I pointed it at myself.

Quitting his job to grow his 5-figure MRR portfolio

I launched on Product Hunt with zero audience: 1 upvote, #333. Here's everything I learned as a complete beginner

I built an AI fitness app solo, got banned from Reddit, flopped on Product Hunt, and found traction on Q&A sites. Here's what worked.

Same idea, 14K views on Reddit and <15 impressions on X

I built a PDF-to-JSON tool because I didn't trust the AI's output

We got our Shopify app approved in 72 days. Now we're stuck at distribution and people keep offering us paid reviews.

AI assistants are becoming shoppers. I launched a $149 check that shows whether your store breaks them — tear my offer apart

I built the product. Now I’m questioning whether users will build the habit.

Would You Rather Get Backlink Exchanges or Turn One Article Into Distribution Content?

2,000 upvotes on Reddit, 0 signups. I stopped launching and started commenting. 11 customers later.

We're validating two product ideas at once — trying to figure out which problem is worth solving first

I built a guard for AI agents that act on stale information

3 weeks ago: 0 paying users. Today: every fix the commenters asked for is live

We stopped sharing agent logins, and the fix was a smaller credential, not a bigger one

We sold the documents before we sold the software, and it was not the plan.

15 days after launching to zero audience: $0, 1 follower, 0 stars. The full numbers.

I built a location-aware social platform as a solo founder - now I need real feedback

They hired me for a 6-month build. I spent 18 months doing everything they asked — and they left saying I didn't deliver.