Lead Payroll and EOR through rapid growth. Scale tax engine with compliance across jurisdiction laws and requirements. Advocate for engineering best practices and speedy deliverables.

I grew the size of the cross-functional team from 2 to 6 engineers, including 3 backend engineers, 1 fullstack web, 1 fullstack iOS, and 1 Android engineer.- Promoted 2 engineers from junior to mid level and 1 engineer from mid to senior by increasing the scope and leverage of impact. Managed an underperforming engineer out.- Developed career path for each engineer through clear, actionable feedback and active coaching, which led to 3 individual promotions, higher sprint velocity, higher code output, and high team autonomy with stakeholder satisfaction.- Technically strong and very hands-on. I provided critical technical guidance to the team on designing complicated systems such as Search Autocomplete, Server-driven UI, Indexing at scale and SEO diff-in-diff AB test- Led product initiatives across Product, Infrastructure, and ML, such as SEO directories, logged-out search, unified search, robust experimentation for UI, Lambda Rank to improve Search CTR, and infrastructure cost saving.- Led my team to continuously contribute to the search-driven revenue growth quarter over quarter. I achieved this by partnering with the Revenue team and prioritizing the work which maximizes revenue impact.- Our team members constantly share knowledge inside and across the organization. Many team members have won awards and are received acknowledgment. I encouraged mentorship, code-pairing, and participation in technical co-op

Hoodline was acquired by Nextdoor in September 2019.- I played the tech lead role for the Business Admin project. I was in charge of backend and frontend coding, designing Photo Gallery, Autosave, and Profile Switching system.I was the main responsible person to release features across the web, iOS, and Android. - I had a strong collaboration with product and design. More often, my feedback got incorporated into the final product and helped with faster delivery.- By leading initiatives successfully, I accelerate the team business growth to increase the organic business WAU and revenue funnel.- I owned sprint planning and retrospectives. I helped my team with PR reviews. I also wrote technical design docs and advised other technical designs.

Lead full stack engineer on Hoodline.com and GIS location service. I lead and own Location service which powers spatial data need for API and machine learning.Backend:• Aggregate public domain and commercial geospatial data for Location service which helps scale up distribution and ML location tagging from local (address and neighborhood) to DMA (cities, counties and metro areas), we expanded rapid distribution and onboard new partners• Collaboration with machine learning team on geotagging for articles• Help to track human writing and editing cost per automated storyFrontend:• Hoodline CMS UI features which help reducing the editing and publishing time per article for our in-house editors• Location service admin tool to visualize geospatial analysis from SQL statements.

Platform architect and engineer for Card Linked Offers from Groupon.Backend• Workflow to onboard merchants to cash back reward programs and integrate with credit card processing partners• Perform benchmark tests and address bottlenecks before holiday season.Frontend• Admin UI to help customer success to onboard and manage CLO merchants• Timeline visualization of a merchant in CLO program to give insights to customer support and customer success staff

Pingpin, Inc was acquired by Groupon in April 2012I owned and developed features end to end across frontend and backend platforms for Breadcrumb PRO point-of-sales system. Our team delivered insights to restaurant owners and managers to better manage day to day operations

Project owner and web engineer building a delightful photo sharing app with Ruby on Rails, Javascript and devops

Led and brought mahshelf.com - a social network for web comics to MVP.