Collaborate with product managers and designers to plan features that meet company direction and mission. Design engineering solutions, lead/participate in design discussions, and formulate stories. Implement the solutions in both front-end in JavaScript/TypeScript and back-end in Java. Own the delivered features and products by monitoring metrics and bugs, and collaborate with product managers to learn and iterat

- Provided technical leadership and directions, instilled good engineering practices, defined patterns, code standards, operational guidelines, and workflows for the engineering organization.- Architected solid design, addressed increasingly complex problems, delivered production-ready, scalable, and performant codes with solid test coverages.- Earned the trust of stakeholders in the capacity of a technical advisor, regularly providing insight into technical feasibility, the available range of solutions with any accompanying trade-offs, as well as outlining the high-level engineering efforts required to solve complex, high-impact business challenges.

• Identify the most impactful business problems, collaborate with colleagues in the high-performance team, and implement the solutions expeditiously. Design, implement, write tests, and own the features by ensuring proper deployment, measuring metrics and monitoring errors. Notable features include:o Distribute shifts between zones based on order forecasts to establish identical capacity-to-demand ratio between zones while supporting various staffing configurations, allowing maximum order intakes in addition to removing time-consuming manual shift changes.o Automatic process of employee callouts. Use state machine and states based on time of callout and availabilities of reserved and standby employee(s) to govern required steps. Automatically reschedule affected orders on the same day and alert support slack channels of un-rescheduled orders. It saved hours of manual callout process and allowed instant order rescheduling.o Persist order events using STI with relevant details throughout order’s lifecycle, which are retrieved and displayed in order detail admin page in chronicle order for better understanding of what happened to orders, resulting in swift resolution of support tickets. STI allowed easy expansion of additional order events. o Automatic process of emergency incidents encountered by delivery employees. Create API end-points for creating an incident record from mobile app and for calling safety managers on call chain and connecting them with an employee via Twilio.• Created a standalone checkout application for partners, where customers are redirected from partner websites to complete the checkout by entering shipping address, choosing a delivery time, and entering credit card information (Ruby on Rails, React.js with Redux, Postgresql). Created simple order management pages to view orders, make full/partial refunds, and cancel orders.

• Implemented front-end and back-end features for Pebble’s marketing, e-commerce, fulfillment, and Kickstarter backer management Ruby on Rails apps (MongoDB, Redis, Sidekiq, Angular.js, React.js).• Ensured fraud management, inventory management, payment authorization/capture/refund, and shipment management are correctly performed throughout order’s lifecycle.• Built internal management tool for marketing/support/finance team to search/view/modify/manage an order, view basic order statistics, fulfill backordered orders, and manage products and their variants.• Monitored and analyzed e-commerce metrics (Google Analytics, Kissmetrics, Crazy Egg), build hypothesis, execute A/B tests (Optimizely, Split gem), and implement necessary features based on results.

• Architected a scalable FIFO queue model with finite state machine and API interface to allow users to add/stop/delete different types of custom tests per queue and to allow tests run automatically when ready.• Refactored most of models and controllers as well as unit/functional tests of current application (Rails, Redis, Resque, CouchDB) to be the base of a larger application. Wrote base feature tests using Capybara.• Wrote unit and functional tests with RSpec and implemented back-end (Rails using CouchDB and Redis) for extended capability of existing performance test suite and malware testing capability of audit test suites.• Peer review pull requests and write constructive comments with concrete examples and reasons to promote healthy engineering culture in the team.

I do what I can to help out whenever I can.

• Created wireframes and user stories, and pair-programmed to build a minimum viable product (http://picpler.com) in Ruby on Rails. Built a landing page to test a pivoted idea (http://recommendfu.com). • Performed Google AdWords campaign tests with simple landing pages that collected email addresses to test ideas, where the best idea resulted in 3.3% CTR and 16.7% conversion rate.• Built a table of customer problem hypothesis and alternate solutions, and executed customer hypothesis validation interviews on the streets.

• Responsible for driving traffic and revenue for online Coupon Codes product at Coupons.com. o Write specifications to improve SEO ranking by adding original contents, increasing coupon codes inventory, updating title/h1/metag tags, and addressing duplicate content issues and numerous crawl errors. o Wrote an independent Ruby on Rails application to query Google search with permutations of retailers and keywords, scrape the search result page, and assign points based on position in search results. The index or points are used as internal metrics to measure SEO ranking and to compare with competitors. o Wrote an independent Ruby on Rails application to access Google Analytics via API and retrieve relevant data (pageviews, CTR, search traffic) to track and measure. • Drive an initiative to offer daily deals as part of Local Coupons product by contacting major daily deal companies, negotiating key terms with potential partners, and writing detailed specifications for web pages and email campaigns with UI/UX examples.

• Responsible for Deal of the Day advertisement product, an incentivized advertisement delivery product to monetize non-paying users in social games..o Integrate new publishers and assist them in creating most compelling Deal of the Day solution. o Drive technical meetings with developers, be in constant contact with Facebook’s policy team regarding their policy changes, and keep the integration documentation for publisher up to date.• Created specifications for game mechanics, viral and monetization features to increase user acquisition, user retention and revenue.o Use internal tools to track and monitor key statistics and those of newly deployed features such as impression numbers, click-through rate and conversion rate to measure the success. Analyze the data to drive feature development.o Collaborate with advertisement team members to design and run campaigns in RockYou advertisement network and on Facebook.o Formulated monetization strategies. Implemented premium currency and PayPal payment features including 1-click buy. Manage premium features and work with art team to create/maintain game assets list.

• Successfully drove positioning and strategic change for Asia region across diverse stakeholders including product team, management team, sales team and channel partner. Significant contributor in developing core message and sub-messages for different target segments.• Developed anti-DoS market in Korea by discovering customer pain points, understanding customer buying behavior, identifying market potential, formulating market strategy and tactics, evangelizing products and solutions, guiding channel partners, and managing business. • Managed entire lifecycle of hardware and software products, from inception to launch.• Provided sales and technical trainings to sales force include sales engineers and channel partners in Korea and Japan.• Utilized social networking platforms such as YouTube and Facebook in raising company and product awareness.• Contributing columnist for Information Security 21c, a monthly network security publication in Korea.

Founded a social networking site in 2006, targeting approximately 10 million parents with children under age of five in US. Positioned it as collaborative opinions site for parents by emphasizing relevant reviews/ratings after carefully studying competitive landscape.