“Ayumi Yu, Cloud Artisan”

Github: github.com/ayumi

Email me: ayumi at ayumiyu dot com

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Senior Software Engineer @ CoderPad

2019-01 – 2021-10

CoderPad is a live programming environment for interviewing programmers. It is fully featured and includes autocomplete, multi-file editing and databases. Customers during my time included Facebook, Dropbox, Jane Street and Twitch.

  • Created the Overage Billing system to allow flexible service usage. After 2 years, this system did $500K/year in revenue.
  • Led a migration of search provider from external Algolia to in-house Postgres search, saving $25K/year and simplifying the codebase.
  • Architected and led the upgrade from single file editing to multiple files, which required systemic changes of legacy code.
  • Added LSP (Language Server Protocol) services for code diagnostics and autocomplete, replacing disparate language servers.
  • Worked on every part:
    • Web Frontend – Rails, React (with Redux), Firebase, WebSockets.
    • Code Execution and Intelligence Services – Node, Docker, WebSockets, Kubernetes.
    • Ops – Google Cloud (Google Kubernetes Engine); Ansible.

Senior Software Engineer @ Brave Software

2016-08 – 2018-04

Brave is a web browser company which protects people’s privacy and security on the Internet. Brave also helps publishers make money with privacy-preserving ads and contribution system.

  • Created and managed Brave Rewards for Creators, a frontend for web creators to get paid via the Brave Browser BAT ecosystem.
  • During my time Creators was used by 10,000+ publishers. As of September 2020 there were over 800,000.
  • Co-created end-to-end encrypted browser data sync library brave/sync.
  • Worked on a cross platform web browser written in Muon (a fork of Electron) and React.

Senior Software Engineer @ Entelo

2014-02 – 2016-07

Entelo makes a professional people search engine and other recruiting tools. During my time there, company revenue was $100Ms ARR.

  • Worked on core search engine: data acquisition, processing, indexing and frontend.
  • Created Entelo Track, an email service which instruments email engagement.
  • Created an API integrations framework for applicant tracking systems.
  • Tech: Elasticsearch, Docker, Ruby, RDBMS (5+ TB), AWS

Software Engineer @ Leap Motion

2012-10 – 2013-04

Leap Motion is a computer hardware sensor which tracks hands and fingers in 3D space.

  • Worked on web infrastructure supporting the sensor: Web backend, app curation tools, and the web shop.
  • Apps served over 1M+ users.

Software Engineer @ Expensify

2011-02 – 2011-11

Expensify makes nice expense reporting software.

  • Created “SmartScan” receipt data capture and OCR system.
  • Created HTML5 canvas image editor.

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