Sherry Jiang, founder of Peek, discloses the technical stack used to build her mobile personal finance app.
Insight
Jiang: Spending three hours vibe-coding a prototype compounds significantly over time
“Sometimes you can just take a first step to getting started, whether it is three hours of vibe coding a prototype just to test something with users or writing your first like, Hey, I'm building this app and this is day one. That's all you really have to do som…”
Insight
Jiang: Self-improvement apps must guide user actions, not just track metrics
“It's the same kind of concept of, like, you know, you have to, like, capture not just the tracking and the numbers part. It's like there's so much more, so many more steps to ultimately getting to you taking an action and then seeing the results of the action.”
Insight
Jiang: Apply the 'Rule of Six' for optimal app prototype user testing
“So I had this thing I call a rule of six, which means talk to six people that you think is in your ideal customer profile. Two less is like, you don't have enough sample size, too many. It's like, you just don't move fast enough because like, you know, people …”
Disclosure
Jiang: Peek combines Claude for reasoning with Gemini for fast tool calling
“As for the LLM side, we actually string together a combination of, ah, Gemini, as well as Claude, ah, depending on like the, I guess the function, but a lot of the initial insights, like, These kind of I would say like more detailed insights. We use three seve…”
Insight
Jiang: Founders building in public must rely on replies before standalone posts
“When you're, you know, early on, like, reply a lot, and then at some point, your post will carry you more”
Insight
Jiang: Human taste remains essential because 90% of AI-generated ideas are terrible
“I mean, the one thing you still have to have is you have to have taste. I mean, they'll give you a bunch of ideas, like nine out of 10 are shit. You have to decide, like, which one, like, you know, catches people's attention, is visually suitable, and can rela…”