# Yuyi Li > Software Engineer Location: Pleasanton, California, United States Profile: https://flows.cv/yuyi I am a full stack JavaScript engineer. I enjoy tackling down complex technical challenge with well-planned solution, whether it is building an application from ground up or fixing a small bug that hardly notice by anyone. I am passionate about using technology to improve the daily lives of people. ## Work Experience ### Software Engineer @ Citizen Health Jan 2025 – Present | San Francisco Bay Area ### Software Engineer @ PartySlate Jan 2023 – Jan 2025 | San Francisco Bay Area ### Software Engineer @ Upstart Jan 2021 – Jan 2023 | San Francisco Bay Area Upstart Auto Retail (UAR) provides innovative software solution for automotive industries. - Rewrite Upstart Auto Retail (UAR) online application with React / Typescript to improve user experience with responsive design for Web / Tablet / Mobile. - Implement mission critical features on UAR in-store React Native application, helping company approve and fund first auto-loan on the platform and sign up major customers. - Architect Build Your Own (BYO) car feature to address inventory shortage problem with NodeJS / React / Typescript, and meet critical requirements for OEM certification. - Code owner for the React Native app for code review and app store deployment and integration. ### Software Engineer @ Finix Jan 2019 – Jan 2021 | San Francisco Bay Area Finix provide the infrastructure for software companies to own their payment solutions and generate revenue. Joined as #2 frontend engineer, to help scale and set up engineering standard for the team. - Rewrite the Finix payment dashboard application utilizing JavaScript (ES6), ReactJS, and Redux, increase frontend development speed by 50%, and complete project 2 months ahead of schedule. - Built internal admin tools to simplify technical support workflow, increase efficiency of support team by 20% and saving company 200 engineering hours annually. - Redesigned and expanded payment dispute / chargeback UI, improve usability of the feature by covering 90% of use cases, resulting 100 times increase on page views. ### Software Engineer @ SugarCRM Jan 2017 – Jan 2019 | Cupertino, California, United States Sugar is highly rated CRM for sales, marketing, and service teams so they can focus on boosting productivity, business growth and engaging customers in moments that matter. - Implemented automated screenshot comparison tests with JavaScript and GraphicMagic, saving company over $50,000 annually by reducing QA engineering time on manual testing. - Re-styled UI components on SugarCRM core app with LESS/CSS to improve customer satisfaction rate by 30%. - Developed customer service package that can increase company revenue by $300,000 annually. - Built three UI features related to data privacy management with JavaScript, HTML, CSS with over fifteen engineers and designers across four cross functional team. ### Software Development Engineer @ Yahoo! Inc. Jan 2017 – Jan 2017 | San Francisco Bay Area The BrightRoll Ad Exchange Platform serve millions of Ad on daily basis. - Converted to full time in less than 3 months from a contractor (via Mindlance) - Re-engineered UI layout from static to expandable rows in BrightRoll Ad Exchange platform utilizing JavaScript (ES6), ReactJS, and Redux, enhancing information presented to sellers and bidders by over 50%. - Optimized front end response time 5X faster than previous UI through implementing responsive rendering of ReactJS components with pagination. - Launched four UI features on BrightRoll Ad Exchange platform in less than 4 months (33% ahead of schedule) on team of four software engineers following agile development methodology. - Architected UI components with JavaScript ES6 pattern saving company over $100,000 annually in developer time through reducing need for continual maintenance and debugging. ### Lab Manager + Research Engineer @ Lawrence Berkeley National Laboratory Jan 2011 – Jan 2016 The BATT program focus on fundamental research on energy storage technologies for higher power density and lower cost solutions, to overcome the most critical road block to bring electric vehicle to the mass market. Responsible for lab operation, safety and research on cathode materials. - Improved capacity of lithium ion battery cathode by ~30% by utilizing advanced nanoparticles synthesis. - Managed operations of 20+ research facilities in support of 60 staff members, reducing lab downtime by 90%. - Led 10+ initiatives to improve operational laboratory efficiency and safety, winning 2 divisional safety awards. ### Research Engineer @ Solarmer Energy, Inc. Jan 2008 – Jan 2011 | El Monte, CA Solarmer focus on developing lightweight and flexible polymer based solar panels, at fractions of cost of the traditional silicon solar panels. Responsible for developing solutions-based roll-to-roll manufacturing process. - Developed flexible organic solar panel with 40% transparency utilizing a new photovoltaic cell architecture. - Increased power conversion in flexible panels by ~50% through optimizing the slot-die coating and drying method of active and buffer layers during the manufacturing process. ## Education ### B.S in Chemical Engineering UCLA ## Contact & Social - LinkedIn: https://linkedin.com/in/liyuyi --- Source: https://flows.cv/yuyi JSON Resume: https://flows.cv/yuyi/resume.json Last updated: 2026-04-10