I have experience in back-end web development and Java application development. Also have some experience in Angular and Typescript. In my spare time I created a website to make players farm items more efficiently in a mobile game.

Experience

2023 — NowBloomreachStaff Engineer

2023 — Now

Mountain View, California, United States

2019 — NowPenguin StatisticsFounder, Webmaster and Website Operator

2019 — Now

I am the founder and software engineer of Penguin Statistics. Our website serves as a place where players could upload item drops for mobile game "Arknights" (by Hypergryph). Our system would then aggregate and visualize statistical data and deliver our analytics in intuitive ways for players to query and cite with.

The site has over 3M+ Unique Views and over 90M+ Page Views since launched, with extremely low cost thanks to a carefully built infrastructure.

My responsibilities on this project are:

Formed and manage the team

Implemented V3 Backend (written in Go) overhaul & completed overhaul with the team in 2 months

Continuously improve the performance of the back-end

CDN and network performance optimizations

Design, implement and iterate UI/UX across the fleet of Penguin Statistics services

Compose & iterate development documentation

Discuss and iterate product with user's feedback

I18n for the whole website (English and Japanese)

GitHub repo: https://github.com/penguin-statistics

2018 — 2023Radiance CommerceSoftware Engineer

2018 — 2023

San Francisco Bay Area

Implemented the whole SmartChat flow executor. Designed and implemented inherited merchant-customizable prompt and parameters settings system. Integrated with vector DB and implemented a cron job to sync product catalog and FAQs with their vectors in DB. Designed and implemented benchmark evaluation system to improve prompts and parameters. Implemented and exposed a general LLM calling framework for the backend development

Integrated chat bot with various 3rd platforms in multiple areas, such as customer support(Zendesk Support, Helpscout, Gorgias), scheduling (Timekit, Acuity, Xtime), SMS(Postscript), shipment tracking(Easypost), rewards(LoyaltyLion, Swell). Designed rate limiter to handle inbound and outbound requests, and designed state machine to handle the sync issue between ticket status and conversation session state

Implemented new features in backend, such as store locator in the chat bot, campaign/engagement/reminder sender, URL shortener, event logger and archiver

Performed daily bug fix and maintenance in Java Servlet backend. Performed daily data maintenance such as writing script to import, fix data, and wipe data for GDPR

Built auto-tester for the chat bot, which enables customized testing flow

Managed servers in AWS EC2, set up load balancers, monitor multiple services with AWS CloudWatch. Constructed CI/CD flow with Jenkins and AWS CodeDeploy

Monitored and fixed issues for important services like: production and staging instances, MQ, Redis, ELK, Rasa NLP, Jenkins, etc.

Implemented analytics dashboard and statistical charts in Angular with D3.js

2018 — 2018Carnegie Mellon University Silicon ValleyGraduate Teaching Assistant

2018 — 2018

Teaching Assistant for 18-655 Service Oriented Computing. Responsibilities include providing recitations, answering questions on Piazza and grading assignments and team projects.