# Rudy S. > iOS Mobile and Backend Software Engineer Location: San Francisco, California, United States Profile: https://flows.cv/rudys I'm a full-stack software engineer with a focus in developing web applications using a variety of technologies, platforms, and languages. I've worked in a wide variety of industries like education, veterinary care, real estate, fashion, and e-commerce. I am strongest and most interested in the Ruby on Rails stack. However, I'm actively learning iOS and other mobile development (React Native), and others! Also very interested in data science. In 2017-18, I lived and worked abroad in Manila, Philippines. I led an engineering team at an education start-up, got involved in the Ruby community there, worked on a project for Ateneo de Manila University, and gave a presentation at the University of the Philippines (the country's top two universities), all while exploring and extensively learning about the country. Specialties: Ruby on Rails, JavaScript, HTML, CSS, React, Node.js, iOS & Swift, Bootstrap, MySQL, PostgreSQL, MongoDB, Python, Flask, Test and Behavior Driven Development (RSpec, Cucumber, Capybara), Agile Development, Mac OS X, Linux (Ubuntu and CentOS), Facebook & Twitter API, Resque/Redis, Sidekiq, REST, GraphQL, ElasticSearch, AWS, Heroku ## Work Experience ### Senior Software Engineer @ DraftKings Inc. Jan 2024 – Present ### Software Engineer, Back-end @ Jackpocket Jan 2021 – Present | New York, New York, United States ### Senior Full-Stack Engineer @ Liftopia, Inc. Jan 2019 – Jan 2020 | San Francisco, California, United States Liftopia operates the largest online marketplace and resort technology platform serving the mountain activity industry. On Liftopia.com, skiers and riders can purchase lift tickets, equipment rentals, meal vouchers and more from more than 250 ski areas in the U.S., Canada, and Europe. Liftopia is also the leading provider of dynamic pricing and e-commerce solutions for ski lift companies, water parks, and other attraction providers. ### Engineering Lead @ Edukasyon.ph Jan 2017 – Jan 2019 | Taguig, National Capital Region, Philippines Edukasyon.ph aims to improve access to higher education and empower Filipino students to make informed educational choices that improves their employability. Managed and worked with a team of 4 engineers. Notable projects include: *Online school application system where premium schools can create and manage application forms for students to apply (applicant management system) *Scholarship platform with customizable application system *Implemented ElasticSearch to build and enhance the school, course, and scholarship search platform. Custom application system and dashboard for Philippines’ top university *Content management system with analytics dashboards and application management systems for school and institution admins ### Senior Full-Stack Developer @ Corefact Corporation Jan 2015 – Jan 2016 | Hayward, California, United States Corefact provides full-service marketing for the real estate and mortgage industries, whose products help agents generate leads and list more properties. Projects include: *Upgrading and enhancing Corefact's signature Home Estimate product. This product is accessed by a call-to-action and unique keycode on a postcard sent to property owners to obtain the value of their home, a map of their neighborhood that displays current market activity, recently sold comps, tools to alter the home value, and actions to contact an agent. I was responsible for developing a newer, refreshed, and mobile-friendly version of this product along with enhancements to make the product easier to use and allow homeowners to adjust their home value *Led a small team to create and develop the ListAssist project, which was a suite of products that allowed listing agents to easily market their listings via a diverse set of products. Listing agents could create and manage their listings, create clean, mobile-friendly property websites, and create print products that showcased their listings' property information and photos ### Senior Rails Developer @ VIP PetCare Jan 2014 – Jan 2015 | Santa Rosa, California, United States VIP PetCare specializes in affordable, preventative veterinary care for pets and their owners, by hosting community mobile veterinary clinics at partnered pet businesses. Projects I worked on included development of a platform that stored and managed health/medical records and vaccination records of pets that used VIP PetCare. This platform also kept track of the pets’ owners, medication they’ve taken or needed to take, prescriptions/refills, email and text reminders to owners, reactions to medication, pet profiles, and more. Also developed an API to interface with the iPad app that veterinarians and vet technicians used at the mobile vet clinics to create/edit pets, manage vaccination certificates, and perform operations and sales. ### Ruby on Rails Developer / Technical Co-Founder @ Sandbox Industries Jan 2012 – Jan 2013 | San Francisco, California, United States Development of CareSimply, a site that allows people to look for caregivers for their loved ones (family, friends, relatives, etc.). Lead a small team (one in-house developer, one remote contractor). Features included being able to search and filter caregivers (used Solr for search/filtering, Geocoder for location-based searching), caregivers can create and show off their profiles, clients can create job postings and offer jobs to caregivers who match their needs, and had a shift man- agement system where caregivers can create shifts for jobs they worked (caregivers can also log-in and log-out a shift via phone, using Twilio developer API for SMS and voice-phone functionality) ### Software Engineer @ ModCloth Jan 2010 – Jan 2012 | San Francisco, California, United States Several projects and features using primarily Ruby on Rails, MySQL, jQuery, HTML/Sass, RSpec, Jasmine, Cucumber/Capybara/Selenium. Also dabbled with Resque/Redis, Capistrano, web services, and more. Pair-program full-time in small teams, and projects include: Sphere: Buying/Checkout *Shipping Address Verification (QAS) *SEO Enhancements *Holiday Shipping Promotions *Tax Sphere: Sourcing and Supply Chain *Inventory Intake & Adjustment Processing *Vendor Problem/Issue Tracking *Vendor Management Interface *Purchase Recommendations and Product Replenishments Sphere: Discovery & Social Commerce *Filter by size & price *Redesign of top & left navigation of modcloth.com *Redesign of the product details page *Category pages retrieve products via Solr ## Education ### Math / Computer Science UC San Diego ## Contact & Social - LinkedIn: https://linkedin.com/in/rsombillo --- Source: https://flows.cv/rudys JSON Resume: https://flows.cv/rudys/resume.json Last updated: 2026-04-10