---
title: "Ziwei Yao (@vitayao) | Hashnode"
description: "Manager at Tokatlas. Read the latest articles by Ziwei Yao on Hashnode."
url: "https://hashnode.com/@vitayao"
---

@vitayao

# Ziwei Yao

@vitayao · Joined October 2026

Manager at Tokatlas

### [Invoice extraction with an LLM: define missing values before writing to a database](https://vitayao.hashnode.dev/invoice-extraction-with-an-llm-define-missing-values-before-writing-to-a-database?utm_source=hashnode&utm_medium=feed)

Define invoice fields, missing-value rules and acceptance cases before connecting an LLM extraction step to your database.

4 min read · [vitayao.hashnode.dev](https://vitayao.hashnode.dev/invoice-extraction-with-an-llm-define-missing-values-before-writing-to-a-database?utm_source=hashnode&utm_medium=feed)

[Oct 29](https://hashnode.com/posts/invoice-extraction-with-an-llm-define-missing-values-before-writing-to-a-database/6ae2e2bc44e5d5b4e175a0df)

### [Your AI API timed out. Should you hit retry?](https://vitayao.hashnode.dev/your-ai-api-timed-out-should-you-hit-retry?utm_source=hashnode&utm_medium=feed)

You send a request, wait, and get a timeout. The natural next step is to try again. But before doing that, there’s one thing worth checking: did the first request actually stop? I’m vita from the Toka

2 min read · [vitayao.hashnode.dev](https://vitayao.hashnode.dev/your-ai-api-timed-out-should-you-hit-retry?utm_source=hashnode&utm_medium=feed)

[Oct 28](https://hashnode.com/posts/your-ai-api-timed-out-should-you-hit-retry/6ae195ebbd4d46697741a7a9)

### [Before choosing a cheaper AI API, measure cost per accepted task](https://vitayao.hashnode.dev/before-choosing-a-cheaper-ai-api-measure-cost-per-accepted-task?utm_source=hashnode&utm_medium=feed)

A lower token price is easy to compare. The cost of getting a usable result is harder. I'm on the Tokatlas team, working on a commercial multi-model API platform. This is a proposed evaluation checkli

4 min read · [vitayao.hashnode.dev](https://vitayao.hashnode.dev/before-choosing-a-cheaper-ai-api-measure-cost-per-accepted-task?utm_source=hashnode&utm_medium=feed)

[Oct 27](https://hashnode.com/posts/before-choosing-a-cheaper-ai-api-measure-cost-per-accepted-task/6ae0419fa04abb9661ce2ecb)