Marketing intern with zero coding skill built an FHE health app using Claude
A 22-year-old economics major working as a marketing intern, with no software or background, built a health app called VitalVault using Claude Code. The app uses , a form of encryption that allows calculations to be performed directly on encrypted data without ever decrypting it. Users enter health and lab values, which get encrypted; the server then computes a wellness score and an estimated biological age while only ever seeing the encrypted ciphertext, never the actual numbers or the .
The builder drew on public GitHub tools from Niobium Microsystems, the company where they intern, feeding them to Claude as reference material. The project took about three days and involved getting stuck repeatedly, plus a scare where an 8GB RAM 2023 MacBook Air nearly overheated under the workload. Claude wrote essentially all of the code, but the builder still had to learn enough to recognize when something looked wrong.
Lacking expertise, they are now asking the community, especially anyone familiar with FHE, to review the work for security or cryptographic mistakes.
Key points
- A 22-year-old marketing intern with zero coding background built VitalVault, a health-data encryption app, using Claude Code
- The app uses so the server computes a wellness score and biological age estimate from encrypted data without ever seeing the raw values or the key
- Development took about three days on an 8GB RAM 2023 MacBook Air, which struggled under the workload
- Claude wrote nearly all the code; the builder learned just enough to spot when something looked off
- Since the builder isn't a expert, they're asking the community to check the for security or crypto mistakes