# Sean Mangosing > I build responsive websites that drive results | Full Stack Developer with a design background | Proficient in JavaScript, Node.js, Python & Rails Location: San Francisco Bay Area, United States Profile: https://flows.cv/seanmangosing I am a Full Stack Developer with a background in design. My focus is on creating beautiful, clean, user-friendly websites with a large focus on Front End Development and User Experience. I am well-versed in JavaScript, ReactJS, Redux, D3.js, Python and Node.js which I use when designing and building web applications. ## Work Experience ### Software Engineer @ Calendly Jan 2022 – Present | San Francisco Bay Area ### Software Engineer II @ Humble Bundle Jan 2022 – Jan 2022 ### Software Engineer @ Humble Bundle Jan 2020 – Jan 2022 | San Francisco, California, United States ### Frontend Engineer - Web @ Rylo Inc. Jan 2019 – Jan 2019 | San Francisco Bay Area Developed and maintained dynamic and interactive website that ensured high traffic, page views, and User Experience, resulting in a 40% increase in sales revenue Fixed bugs from existing website and implemented enhancements that significantly improved over all web functionality and speed Oversaw full lifecycle of software development for the community section of Studio app ### Web Developer @ Ascendify Jan 2018 – Jan 2019 | San Francisco Bay Area Owned company-wide and client-facing Web Development. - Built modern, responsive-design websites for our clients from scratch that leverage the company's widget technology using primarily HTML5, CSS3, Javascript and jQuery - Utilized creative solutions to customize widgets to client specifications - Ensured all Talent Communities (Careers site) are SEO optimized - Worked with clients directly on any Talent Community (Careers site) requests and offer design recommendations - Fixed ticketed issues or design requests with a high degree of accuracy and speed - Worked with the Engineering team to ensure Talent Communities (Careers site) receive necessary code updates ### Front End Developer @ SM Digital Designs Jan 2016 – Jan 2018 | Richmond, California Engineered baking e-commerce system in JavaScript, HTML5, and CSS3 with PayPal API integration, expanding payment channels by 2X while enabling online orders. Crafted customer-facing interface to custom car rim solutions company, designing overall storefront and 7 individual product pages with JavaScript, HTML5, and CSS3, implementing Photoshop PSD Mockups. Developed informational platform for 4richmond nonprofit organization to assist over 100,000 community members in participating in events and providing local job board, built with JavaScript and Node.js. Constructed Bay Area law group automated scheduling service for new client initial consultation calls utilizing JavaScript with Calendly API integration, designed to optimize scheduling by over 98%. Designed fiber optics energy company informational platform to boost web presence by 100% with JavaScript. ### Full Stack Developer - Contract Work @ The Relish Media Group Jan 2018 – Jan 2018 | San Francisco Bay Area Architected admin dashboard page to display latest essential subscription information including the total number of subscriptions, referrers and invitees, utilizing JavaScript, Node.js, and Pug, increasing analytics by 60%. Implemented dynamic JavaScript and D3.js map visualizations of purchase data, resulting in visualization of 25% of platforms sales data. ### Front End Developer - Contract Work @ Tunelark Jan 2018 – Jan 2018 | San Francisco Bay Area Refactored Track Explorer component from CoffeeScript to ReactJS and incorporated new progress bar which improved load time by more than 60%. Ensured responsive UI/UX across 5+ browsers and devices with HTML5, CSS3 media queries and Flexbox. ### Lead Web Designer @ Computer Courage Jan 2015 – Jan 2017 | Berkeley, CA Redesigned entire ecommerce platform for worldwide artisanal oil company La Tourangelle using Wordpress, optimizing UI/UX and checkout flow process by 30% for processing over $1 million in sales annually. Created new platform for UC Berkeley Food Institute to improve user interaction by over 50% and keeping user base informed on new policies, studies, and events, utilizing HTML5, CSS3 and Wordpress. Led site redesign for nationwide Live For Live Music album and concert review company using HTML5, CSS3 and Wordpress, improving ad integration and content showcasing for more than 21,000 unique daily visitors. ### Digital Media Designer @ Puori Jan 2015 – Jan 2015 | Sausalito, CA Participated in creation of marketing campaigns and social media content to increase user interaction by 45%. Consistently met $20,000 quarterly sales target through developing and executing on social media and email marketing campaigns using MailChimp, Instagram and Facebook. ### App Experience Specialist @ Levi's® Stadium Jan 2014 – Jan 2015 | Santa Clara, CA Grew application downloads of Levi Stadium mobile app by 300,000+ through developing execution strategies to inform, educate and teach stadium guests on app features and benefits. ### Legal Assistant @ The Law Office of Kelley Ann Burg Jan 2008 – Jan 2015 | Richmond, CA •Input of new client information •Liaison between office and clients, attorneys, insurance and judicial offices •Filing legal documents at court house •Train new Employees ### Volunteer (Student Project) @ National Park Service, Siren Canteen Branding Jan 2014 – Jan 2014 | Emeryville, CA Oversaw the re-branding process from concept the final product. Concepted, wireframed, mocked up and coded website from scratch using the Foundation framework. Concepted and filmed 30 sec promo video. ### Volunteer (Student Project) @ National Park Service, Student Internship Program Jan 2013 – Jan 2014 | Emeryville, CA Worked on a two man team to create a minute long promotional video from concept to final product. ### Network Administrator @ TCI Computer Recovery Plant Jan 2006 – Jan 2008 | Huntsville, TX •Instructed A+ and Network+ Certification classes •Developed and updated curriculum to introduce students to new technologies and to stay current with testing standards and qualifications •Maintained and exceed daily plants standards of troubleshooting, configuration and updating of computers ### Assistant Office Supervisor @ Atrium Windows & Doors Jan 2004 – Jan 2005 | Tennessee Colony, TX •Managed production process and conflict resolution •Effectively motivated employees •Oversaw quality assurance to ensure increased output (both technical and aesthetic) met existing stringent standards ### M1A1 Tank Armor Crewman @ US Army Jan 1998 – Jan 2002 •Maintained and up-kept running of tank in absence of senior commander •Trained in coming soldiers on tank maintenance •Managed maintenance of weapons, updated records and secured equipment ## Education ### Full stack engineer in Computer Software Engineering Rithm School ### Bachelor's Degree in Motion Graphic Design SAE Expression College ## Contact & Social - LinkedIn: https://linkedin.com/in/seanmangosing - Portfolio: http://www.seanmangosing.com --- Source: https://flows.cv/seanmangosing JSON Resume: https://flows.cv/seanmangosing/resume.json Last updated: 2026-04-11