# Billy Wan > Engineering at Harvey Location: San Francisco, California, United States Profile: https://flows.cv/billywan Engineering manager with proven success managing and supporting high-performance engineering teams. Previously a Senior Software Engineer with a broad interest and understanding of the whole technology stack. Motivated, fast, and relentless learner that thrives both independently and in a team. Coming from a solid engineering background in Artificial Intelligence, I am eager to take ownership of a ground-breaking, customer-centric product and make an outsized impact. ## Work Experience ### Software Engineer @ Harvey Jan 2025 – Present | San Francisco Bay Area ### Engineering Manager @ Opendoor Jan 2022 – Jan 2025 | San Francisco Bay Area • Defined the technical direction, planned quarterly roadmaps, managed day-to-day sprint work, and invested in the performance and career development of 6 engineers on the Consumer Platform team responsible for the design and development of platform tools to accelerate product engineering across frontend and backend • Modernized the entire customer-facing web application platform onto Remix, resulting in a 45% reduction in P90 loading time performance, an 82% reduction in build time, and a 36% reduction in production bundle size • Launched and drove adoption of a new, cross-platform, token-based design system and component library in collaboration with design and product • Spearheaded the company-wide deprecation and migration of 450 experiments and feature flags by a tight contract deadline to a new experimentation platform with developer-centric APIs and 80% lower latency • Led 4 engineers across 2 teams to launch a revamp of the Opendoor mobile app over a quarter, and then chartered the app’s future direction with limited engineering resources • Hired a Staff Engineer and a Mobile Infrastructure team with complex and niche job requirements • Resolved an org-level interviewer shortage by instrumenting a simplified training process for senior engineers • Attained 100/100 engagement scores on all team health and manager questions in semiannual pulse surveys • Unlocked the potential of every team member by either increasing their scope or readying them for promotion ### Senior Software Engineer @ Opendoor Jan 2019 – Jan 2022 | San Francisco Bay Area • Expanded analytics coverage among all customer-facing applications by instrumenting automatic event tracking across core components of the design system, adding 1 million customer events per day, which democratized the collection of business insights and engineering metrics for monitoring and debugging • Improved the page-to-page performance of the seller onboarding flow, reducing the loading time from 1.2s to 48ms and increasing email conversion by 3.2% • Built and validated the unified marketing data tables with marketing stakeholders, providing unprecedented visibility into company marketing spend and savings of 20-30 hours/week of data entry and $1 million/year • Redesigned and revamped Opendoor homepage using the server rendered Next.js framework, improving its Google Lighthouse page speed score from 30 to 60 on mobile and 70 to 95 on desktop • Led engineers across 3 teams to launch the customer dashboard, creating an e-commerce-like experience with easy-to-remember URLs and an overview of all Opendoor transactions of the customer while increasing visual and functional test coverage by >50% and building a new design system and information architecture • Designed and implemented faster and localized ads landing pages, decreasing cost per acquisition (CPA) by 8% ### Member Of Technical Staff @ Oracle Jan 2018 – Jan 2019 | San Francisco Bay Area Working in the Object Storage team of Oracle's newest cloud venture - Oracle Cloud Infrastructure. Major projects include: Pre-Authenticated Requests (PAR) • Designed, implemented, and maintained the PAR feature for sharing resources via server-vended URIs manageable after creation and immune to credential rotation, a key differentiator among competitors • Engineered around various challenges to store PAR metadata as invisible objects in object storage Object-Level Audit Logs (OAL) • Led the design and development of extending audit log generation to object-level requests, providing customers with visibility into object storage usage at a higher granularity • Unblocked Fortune 500 customers to onboard to Oracle Cloud Infrastructure Data Transfer Service (DTS) • Launched DTS with General Availability, enabling migration of terabytes of data from on-premise data centers to object storage, a major leap toward enterprise lift-and-shift • Spearheaded integration with platform services including metering, auditing, and identity management • Mentored new engineers on team onboarding and software engineering best practices Canary Service • Rearchitected the canary using object-oriented design patterns, including wrapper, composite, and factory methods, enabling other team members to easily maintain and extend the software Also extended the Swift- and S3- compatible APIs of Object Storage to help build a richer partner ecosystem. Previously worked in the Solaris Core Services team: • Developed and maintained the Python-based Solaris Image Packaging System (IPS) for delivering software • Extended IPS’ support for temporary package sources, e.g. package archives, to more packaging operations ### Software Engineer @ Oracle Jan 2016 – Jan 2018 | San Francisco Bay Area ### Pratt Undergraduate Research Fellow @ Laboratory of Biological Networks, Duke University Jan 2015 – Jan 2016 | Durham, NC • Developed a GUI-based dynamic biological network simulator in Java for researchers to facilitate the construction, visualization, and analysis of computational models • Extended the simulation module to include expressions in initial condition in addition to literals • Applied the Topological Sort algorithm to resolve 5+ file I/O and performance issues present in the software and restore its basic functions ### Undergraduate Teaching Assistant @ Laboratory of Biological Networks, Duke University Jan 2014 – Jan 2016 | Durham, NC •Developed and refined a new problem set on Hidden Markov Model and Viterbi Algorithm for the class “Discrete Math for Computer Science” •Led weekly recitation sections of 35 students, and achieved 90%+ attendance every class •Evaluated by students as “able to show top-level approach to programming and explain hard concepts effectively with visual aids” ### Engineering Intern @ DukeEngage Jan 2014 – Jan 2014 | Kaihura, Uganda •Designed and constructed 2 buildings of classrooms and storage rooms for the local New Hope Vocational School, leading to a 2-fold increase in its classroom capacity •Initiated and organized 3 on-campus fundraisers, composed and sent out fundraising letters during the academic year to raise $15,000 together with 5 other team members •Negotiated and resolved disputes with local Ugandans across language barrier during the actual implementation process ### Student Researcher @ Duke University Medical Center Jan 2013 – Jan 2013 | Durham, NC • Conducted 4-5 hours/week of independent research assessing ginseng’s ability to rescue reactive oxygen species by evaluating its effect on Glutathione S-Transferase (GST) activity • Collected data from liver and kidney tissue of adult zebrafish by performing GST assay and analyzed it using GraphPad Prism • Authored a 15-page research paper and presented the results to 25 fellow student researchers, 5 mentors and 2 professors ### First-year Intern @ Duke Student Health Nutrition Services, Duke University Jan 2013 – Jan 2013 | Durham, NC • Organized the university-wide gluten-friendly student baking contest, providing students interested in baking an opportunity to showcase their creativity and an encouragement through prizes • Designed flyers, contest rules and evaluation sheets, attracting 100+ students to the final bake-off • Coordinated with staff and chefs from Duke Dining throughout the judging process ## Education ### Master of Science (M.S.) in Computer Science, Artificial Intelligence Concentration Stanford University ### Bachelor of Science (B.S.) in Biomedical Engineering & Computer Science Duke University ## Contact & Social - LinkedIn: https://linkedin.com/in/xizhengwan --- Source: https://flows.cv/billywan JSON Resume: https://flows.cv/billywan/resume.json Last updated: 2026-04-11