Open Source · Mobile
● PRODUCTIONKung Fu Chess
Real-time chess without turns. Native Android client, custom Node server.
7K
users
2M+
moves
4.5★
rating
81K
matches
KotlinLibGDXNode.jsWebSocket
01 / OVERVIEWSenior full-stack engineer
Software that ships,
scales, and stays up.
Eleven years building production systems — eight on Yahoo Mail for Android (20–22M DAU), three more across Yahoo Search iOS and Web, plus backend work at S&P Capital IQ. Available for select freelance engagements through Q3 2026.
0M+
Daily users reached
Yahoo Mail · Android
0 yr
In production
Yahoo · S&P · indie
0.0M
Chess moves played
Kung Fu Chess · users
0★
GitHub stars
126 forks · 81 Facial Landmarks
02 / WORK
Featured · Production
Yahoo Mail for Android
Eight years on the Android client serving 20–22M+ daily users. End-to-end owner of the notifications platform. Shipped Streaks, Email Sharing, Tidy Inbox, AI in Notifications, Augmented Reality Ads, and a Notification Troubleshoot diagnostic tool. Mentored eight engineers, presented dev talks across the org, and authored an IP.com defensive publication for a disposable-address form-fill system.
KotlinJetpack ComposeCustom FluxAndroidIP Publication
22M+
Daily active users
8 yr
Tenure on the team
8
Engineers mentored
IPCOM
Defensive pub. · 2025
SHIPPED FEATURES
- Streaks— Cross-platform daily-engagement system
- Email Sharing— Share-to-Mail flow with rich previews · 11-part launch
- Tidy Inbox— Bulk-action inbox cleanup with daily worker
- AI in Notifications— Server-side LLM summaries · on-device Gemini Nano prompt setting
- Reminders— Set-a-reminder notifications for emails · since 2018
- Augmented Reality Ads— First Yahoo Mail AR ad unit (Sceneform · ARCore)
- Notifications Platform— Push pipeline, channels, foreground service · 8-year owner
- Notification Troubleshoot— Self-initiated user-facing diagnostic flow
- SMS Campaigns— Greenfield service for inactive-mailbox notifications
- Disposable-Address Form Fill— IP.com IPCOM000275828D · 2025
YAHOO_MAIL - ANDROIDYAHOO_MAIL - ANDROID
Other deployed systems
Six more I'm proud of.
Side project · Web
● PRODUCTIONDate Night
A question-card game for couples. Three depth levels, shareable via URL.
12K
sessions
3
depth tiers
ReactNext.jsTailwind
Open Source · Wearable
● PRODUCTIONCryptoFace
Watchface for crypto, stocks, and forex. First GA4 module shipped for Fitbit.
600+
users
18K
API hits/day
5M
lifetime
4.7★
rating
JavaScriptFitbit OS
Open Source · ML
81 Facial Landmarks
Custom dlib shape predictor extending the 68-point model with 13 forehead points. Cited in PhD-level research. Built for PopChat.
492★
stars
126
forks
68→81
landmarks
Pythondlib
Read case studyEnterprise · Kik + Facebook
● DISCONTINUEDPopChat
Founding-engineer chatbot ranked #2 on Kik. 25M+ messages, ~500 req/min peak. Trained the open-source 81-point face landmark model.
25M+
messages
#2
on Kik
500
req/min peak
ScalaPlayAkkaPython
Read case studyMobile + Web
● PRODUCTIONYahoo Search
Native iOS app and search.yahoo.com mobile web. 3× home-screen engagement, >90% test coverage.
3×
engagement
>90%
coverage
100M+
users
SwiftiOSReactRedux
03 / STACK
Capabilities
Polyglot, by necessity.
A decade across the stack means I optimize for what the problem actually needs — not what I happen to know. Each row links to the projects that prove it out.
Mobile
KotlinJavaJetpack ComposeSwiftLibGDX
↳ Yahoo Mail, Yahoo Search iOS, Kung Fu Chess
Web
ReactNext.jsTypeScriptReduxTailwind
↳ search.yahoo.com mobile web, Date Night
Backend
Node.jsScalaPlayAkkaPostgreSQLRedis
↳ PopChat (25M msgs), Kung Fu Chess server
Enterprise
C#ASP.NET MVCT-SQLStored procedures
↳ IQ Language email API at S&P Capital IQ
Systems
AWSDockerKubernetesLinuxnginxVercel
↳ Multi-region deploys, CI/CD pipelines
ML / CV
PythondlibNumPy
↳ 81 Facial Landmarks (492★ · 126 forks)
Booking · Q3 2026
Have a system that
needs to actually work?
I take on a small number of focused engagements each year — typically greenfield MVPs, complex migrations, or native mobile work. Currently accepting briefs for July onward.
Typical reply within 24h