# Sieu Tsoi

> I make computers go beep boop

Location: San Francisco, California, United States
Profile: https://flows.cv/sieu

## Work Experience
### Software Engineer @ Apollo.io
Jan 2021 – Present
Building Apollo's Data Platform from ground up for internal analytics.

● Tech lead for AI Agents platform - a Python API service on k8s/GKE. Built out observability for the service on Grafana - with Prometheus, OTEL, logs, alerts-as-code. Built out LLM quality monitoring platform, including LLM tracing, LLM regression framework, working on LLM evaluations at the moment
● Tech lead for real-time ingestion pipelines from production MongoDB into data lake, merging 30M CDC events (720GB) per hour into analytical storage, using Apache Beam, Spark, and Iceberg
● Built and maintained pipelines that ingest 100TB of production MongoDB data to Snowflake data warehouse weekly, with no impact on production, at 1/10 the cost of paying for a Saas, using Airflow and inhouse pipeline design
● Built and maintained infrastructure (Apache Airflow) to orchestrate data pipelines
● Built and maintained dev tools for the Data Platform team, such as CI/CD, monitoring, dev environments, etc.

### Software Engineer @ Quip
Jan 2019 – Jan 2021 | San Francisco Bay Area
● Real-time system performance
● Data retention and legal hold on Quip documents
● Encryption performance
● Salesforce Permissions in Quip
● Rust R&D

### Software Engineer Intern @ Quip
Jan 2018 – Jan 2018 | San Francisco Bay Area
● Scaled Quip's Slack integration service horizontally
● Implemented process for internal handling of customer issues

### Software Engineer Intern @ Doculus
Jan 2016 – Jan 2017 | San Francisco Bay Area
Worked on multiple functionalities of Doculus' document processor web app, which includes:
 ● Logger for Doculus' server, which is able to log to console, files, or Loggly 
 ● Diff and Merge documents, showing changes between versions for better document management
 ● Find and Replace on documents
 ● Import and Export Microsoft Word documents to Doculus' platform
 ● UI Components

### Cloud Engineer @ Multidisciplinary Design Program: Cloud Manufacturing
Jan 2016 – Jan 2016 | University of Michigan
Worked in the Cloud team, whose responsibilities include collecting and storing data from manufacturing units, of the research project. I contributed to the project by:
 ● Set up a Kafka stream to collect data for the cloud cluster
 ● Store the data in a HDFS cluster
 ● Visualize the Kafka stream in real-time using InfluxDB and Grafana

### Software Developer Intern @ Sophus
Jan 2016 – Jan 2016


## Education
### Bachelor of Science in Engineering in Computer Science
University of Michigan


## Contact & Social
- LinkedIn: https://linkedin.com/in/sieu-tsoi-437084120

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Source: https://flows.cv/sieu
JSON Resume: https://flows.cv/sieu/resume.json
Last updated: 2026-03-29