Latent Health — System Design Phone Screen

Latent Health — System Design Phone Screen

Role: Software Engineer (interviewer said they're targeting senior level)
Round: System design phone screen
Duration: 45 minutes (~5 min intros, ~35 min design, ~5 min candidate Q&A)
Format: Screen share + Excalidraw (bring your own whiteboard tool — have a link ready)

Background (given by the interviewer, ~4 minutes)
Latent Health's first product is in the prior authorization (PA) space. The interviewer walks through the domain first:
When a doctor prescribes a medication, the prescription is sent to the pharmacy the patient chooses. The pharmacy then checks with the patient's insurance payer. If the payer wants more justification before agreeing to pay, it requires a prior authorization form to be submitted.
At that point a pharmacist (or the doctor) has to dig through the patient's records, pull out the relevant clinical information, and fill out the form to justify why the patient needs this med

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tes it when it sees a message from the insurance company that a PA is required.

From there: the pharmacist reviews the AI-filled form → may edit it → approves it to be sent → it goes to the insurance company → the insurance company responds asynchronously, so you need some way to receive that external response.

The users are pharmacists, not doctors. (Worth repeating — it's easy to conflate the two given the domain intro.)

Auth is out of scope. Assume an existing auth service handles user authentication/authorization.