Cheng F. Email & Phone Number

Los Angeles, California, Us

Leading and building teams of user growth engineers to build Web and TV products to drive TikTok user growth. Cultivating growth culture, data-driven mindset and skillset to break through subpar equilibrium continuously. Constantly build green field products and iterate existing products using data-driven approaches to achieve growth goals.Some of the products my teams built from scratch:TikTok Web Apphttps://www.tiktok.comTikTok Web Embedhttps://www.tiktok.com/embedTikTok Browse - Watch popular TikTok videos by topic https://www.tiktok.com/browseTikTok TV apphttps://www.theverge.com/2021/11/22/22796353/tiktok-tv-app-now-available-samsung-lg-google-android-tvhttps://play.google.com/store/apps/details?id=com.tiktok.tvTikTok Content MicrositesTikTok Creator Portal | https://www.tiktok.com/creators/creator-portalTikTok Safety Center | https://www.tiktok.com/safetyYear on TikTok | https://www.tiktok.com/year-on-tiktokCreator Discover List | https://www.tiktok.com/creator-discover-listTikTok Jump | https://www.tiktok.com/jumpTikTok Rewards | https://www.tiktok.com/tiktok-rewards

Los Angeles, California, Us

Web- Architected and implemented tiktok.com website builder framework, powering universal apps (isomorphic SSR + CSR) on *.tiktok.com for various product lines and teams. Teams can spin up a site with minimal effort and ensure reliability and consistency, and be able to build and deploy separately. Drive cross-team collaborative technical roadmap and encourage framework adoption and co-building.- Highlights: performant by default with great core web vitals, world-class i18n support (smart locale detection, scalable RTL), standardized design system, a11y compliantClient ML / Algo / DS- Client ML: train and serve ML model in frontend (for privacy) to better serve interesting content to users, increased user retention by x%- NLP: use BoW, TF-IDF, K-means cluster (with automatic best pick of k) to aggregate public news on TikTok, built a website and message bot to report breaking news based on the NLP methods to help XFN teams to stay updated on public media reports on TikTok, organically grew 1K+ internal users- Causal analysis: use Structured Causal Model (DAG) to analyze product metrics and find causal paths (use conditioning to verify Chain, Fork, Immorality), provide insights and intervention strategies to improve product metrics by changing ancestor nodes- Explainable AI (XAI): train ML models to predict new user retention, and use XAI methods to reveal model insights and find correlations and "magic number" cutoffs, use causal analysis and A/B tests to verify causal structure and improve new user retention- DS: build web scrapers to scrape public news about TikTok, find usages of TikTok web embed and competitor embeds on pages, train ML models to predict if a page mentioning TikTok will have TikTok web embed, and use XAI to reveal insightsProduct Management & StrategyFunction as PM for several greenfield projects, use above data-driven techniques to define product strategy and establish roadmaps, share context and align XFN to build the new products

San Francisco, Ca, Us

Tech Lead Airbnb Associates (www.airbnb.com/associates)Lead the development in a team to build a brand new end-to-end platform from scratch, for social influencers and bloggers to promote Airbnb listings. With an advanced content editor that shows instant previews, associates can create and customize highly interactive and engaging landing pages, embeddable iframes, and affiliate links easily. They can track clicks/views/bookings generated by their content and get paid with commissions. Invented an isomorphic Redux framework to do data fetching, side effects, and state management declaratively; use DAG and topological sorting for automated dependency management and achieve maximum execution parallelism; make development of isomorphic web apps efficient and highly testable. Architected the project structure to normalize previewing and rendering behaviors of all types of content. Organized sprints and coached junior engineers. [TypeScript, React/Redux, Node, Java/Dropwizard/Thrift, Superset]Airbnb x IOC PartnershipLead the development of one of the Airbnb x IOC (International Olympic Committee) partnerships, to integrate Airbnb landing page and embeddable content iframes on on the official Tokyo 2020 Olympic Games site, showcasing the best Airbnb stays inventory in the Tokyo metropolitan area. [TypeScript, React/Redux, Node]Account Settings (www.airbnb.com/account-settings)Lead the revamp project of the outdated Account Settings portal for Airbnb users - which is consisted of more than 10 complex and deeply domain-specific pages. Coordinated engineering and cross-functional efforts with over 20 sub teams across different BUs / orgs to migrate legacy code and scattered domain logic to the new tech stacks and designs. Started the project code base, built the AX framework and patterns, and developed several full pages, and facilitated engineers and other stakeholders from other teams to contribute. [ES2018+, React/Redux, Node, Ruby on Rails, Superset]

Chicago, Il, Us

Our team owns everything under https://www.groupon.com/coupons and all international Groupon sites' equivalent Coupons section. ◦ Full Stack Development: Developed and maintained full-stack Node.js, Java, Ruby on Rails web applications and RESTful API services, to support the whole Coupons stream lifecycle: automated ingestion and taxonomy, editing/curating/scheduling and other admin/CMS tasks, displaying and clicks tracking, revenue pulling and reporting, SEO keywords ranking pulling and reporting, etc.◦ Front End Rebuild: Architected and lead the rebuild of the core pages with emphasis on end-to-end page speed performance. Cut the end-to-end page load time from about 4 seconds to about 1 second on desktop, and from over 4 seconds to about 2.5 seconds on mobile. Speed Index was improved by 2-3 times.◦ DevOps and Automations: Conducted SOA private cloud DevOps, including deployment, monitoring, on call, and maintenance of team’s apps/services in all environments. Develop DevOps automation tools to improve productivity and reduce manual errors. Examples: automatic workflows for code review / merge / deploy / ticket transitions, automatic releases based on gitflow and semver notations, HipChat message hooks, etc. [ES2015+, Vue.js with SSR, Nuxt.js, Express.js, Stylus, Webpack, Babel, Java 8, Dropwizard, Ruby on Rails]

Chicago, Illinois, Us

◦ Front End Development: Built the majority (over 90%) of the front end of the following web apps, and abstracted the solutions into an open-source SPA framework. Highlights: modular and component based, lazy-load resources on-demand, i18n support, HTML5 history API or hash mode, etc. Tech stack: Knockout.js with external templates, Require.js/r.js, Director.js, JSFace.js, Sugar.js, jQuery, Bootstrap, RESTful API (Spring MVC), etc. ∗ Britannica ImageQuest: A highly interactive Single-Page Application (SPA) designed for students and educators to research safe and curated images for educational use. Supports users to save images and organize them into albums, and to cite, email, download, and print images with intuitive UI tools. ∗ Britannica Pathways: Science: A highly interactive Single-Page Application (SPA) designed to help middle school students to learn STEM subjects. Uses interactions such as drag-n-drop, text to speech, rich media (videos, pictures, graphs) playback, etc. to help students dig for evidence to support their predictions and draw conclusions. Support teachers to create classrooms to review and tally students’ lesson progresses and submissions.◦ DevOps and Automations: Built automated workflows to import and update i18n content such as translations and locale-specific resources - engineers had to manually do these before, which are boring and error-prone. Improved ci workflows to lint, check code quality, collect code stats and metrics, build and publish front-end resources. Tech stack: Node.js, Plato.js, Ivy/Ant, Jenkins, etc.Example projects:Britannica ImageQuest http://quest.eb.comBritannica Pathways: Science http://pathways.eb.comBritannica Resource Packs http://packs.eb.comBritannica School http://school.eb.com

Chicago, Illinois, Us

Seattle, Wa, Us

Develop and maintain web applications for Orbitz Worldwide brand sites including Orbitz, CheapTickets, eBookers, Mr Jet, HotelClub/RatesToGo, etc., on Orbitz's next generation Global Platform that's highly scalable, localizable and strictly web standards-driven.Various implementations of new features and maintenance of existing codes; strictly follow company-wide endorsed common SE principles and best practices, include but not limited to: - Separation of Concerns- Do-not Repeat Yourself- Test-Driven Development- AgileFocus on Front-End UI projects for both desktop and mobile sites; strictly follow Orbitz Global Platform endorsed industry standards/best practices, include but not limited to:- Semantic, concise and accessible markup- Object-Oriented JavaScript that follows Design Patterns (Constructor, Decorator, Module, Singleton, Prototype, Mixin, etc.)- Aspect-Oriented JavaScript and CSS- W3C-compliant core HTML components using JSP custom tags- Progressive enhancement- Responsive design- Graded browser support- Cross-browser compatibility for supported A-grade browsers- Mobile-first design and developmentExample projects:- Orbitz.com rebranding implementation [May 2012](http://www.tnooz.com/2012/05/07/news/orbitz-lust-wants-to-put-sizzle-back-into-vacations/)- CheapTickets/eBookers/Mr Jet mobile site homepage redesign implementation [August 2012](m.cheaptickets.com, m.ebookers.com, m.mrjet.se)- Various mobile app promo lightbox implementation on Orbitz Worldwide brand mobile sites (m.orbitz.com, m.ebookers.com, etc.) [June 2012][JavaScript, Prototype, CSS, LESS, HTML, JSP, Spring MVC, Spring Web Flow, Java, GIT, Agile, Scrum, Sprint]

Seattle, Wa, Us

Develop and maintain web applications for Orbitz Worldwide brand sites including Orbitz, CheapTickets, eBookers, Mr Jet, HotelClub/RatesToGo, etc., on both Orbitz's Global and Classic platforms.Work on both web front-end (HTML, CSS, JavaScript, JSP) and back-end (Java, Spring). Example projects:- eBookers series site (e.g. ebookers.com) rebranding implementation [March 2011]- Third-party services integrations (e.g. online chat, site activity/transaction monitoring, ads, etc.), including both back-end and front-end work;- Third-party partner sites search form customizations and integrations (e.g. travel.aol.com, http://www.apple.com/downloads/dashboard/travel/orbitztravel.html, etc.).[HTML, CSS, JavaScript, JSP, Java, Spring MVC, Spring Web Flow, Agile, Scrum, Sprint]

Master Of Science, Human Computer Interaction

Bachelor Of Engineering, Computer Science And Technology