# Jonnatan Ortiz > Senior Software Engineer | Full-Stack | Product-Focused | Early-Stage Startup Experience | ex-Meta | Python, JavaScript, TypeScript, Rails, Node, PostgreSQL, GraphQL, React, AWS Location: Redwood City, California, United States Profile: https://flows.cv/jonnatan I'm a Senior Software Engineer with full-stack experience across early-stage startups and Big Tech (Meta). I enjoy building product-driven systems that scale, from multilingual UX and platform infrastructure to clean, responsive user experiences. I’ve led fast-paced projects involving text-to-speech, speech-to-text, localization, end-to-end student reflection tools, and internal tooling, all while improving app stability and reducing Sentry error volume by over 90%. I work across technologies like Ruby on Rails, JavaScript, TypeScript, React, GraphQL, Node, and PostgreSQL. I thrive in early-stage environments where speed, ownership, and thoughtful engineering make a real difference. I'm especially motivated by mission-driven products and teams that care about user experience and long-term impact. ## Work Experience ### Senior Software Engineer @ Sown To Grow Jan 2025 – Present | Menlo Park, California, United States • Led the development of a full-stack, multilingual reflection feature spanning student-, teacher-, and admin-facing apps, including speech-to-text, text-to-speech feedback, and an enhanced UI tailored for younger students — all delivered under a tight 6-week pilot deadline • Scaled internal infrastructure for localization and text-to-speech to support six languages across multiple modules • Designed and implemented an in-app NPS survey system with randomized delivery, vendor integration, and internal throttling logic • Reduced Sentry error volume by over 90% through proactive bug fixes, improved error handling, and system observability improvements • Provided support across the team, stepped into high-priority projects when needed, and helped maintain stability and momentum during periods of reduced team and leadership capacity ### Software Engineer @ Sown To Grow Jan 2024 – Jan 2025 | Menlo Park, California, United States • Built and maintained end-to-end systems supporting students, as well as a modern platform for teachers, school leaders, and district admins • Played a key role in the company-wide data model redesign, a multi-month effort that touched nearly every part of the system and required tight collaboration across the engineering team • Built an internal demo data tool that generates realistic, dynamic app data to support marketing, sales, and product demos — showcasing key functionality across student, teacher, and admin views • Promoted to Senior Engineer based on increased ownership and contributions to foundational platform work ### Software Engineer @ Meta Jan 2021 – Jan 2023 | Menlo Park, California, United States • Built, tested, and shipped key features for the New Pages Experience (Additional Profile Plus) as part of the large-scale migration of millions of legacy Pages , one of Meta’s top company-wide priorities • Collaborated with data scientists and engineers to analyze and identify root causes of regressions affecting core business metrics across millions of pages, contributing to successful recovery and mitigation • Led engineering efforts in partnership with internal privacy and integrity teams to close feature parity gaps, ensuring user safety and compliance across newly migrated pages • Participated in on-call rotations to triage and resolve internal and user-reported issues, maintaining SLA targets and ensuring platform stability ### Software Engineer @ Rentgrata Jan 2021 – Jan 2021 • Expanded tour scheduling backend endpoints to dynamically fetch, offer and schedule different tour types for end-users based on real-time availability by connecting and working with third-party integrations and ILS APIs • Implemented Google Tag Manager Container foundation for widget iframe application to efficiently push events and relevant data to client's parent frames. • Contributed to the process of detecting and removing new and existing bugs across all of the technologies used by the company, leading to minimized incorrect operations of products, systems, and tools. ### Full Stack Software Engineer @ Cureus Jan 2019 – Jan 2020 | San Francisco Bay Area • Built a dynamic hover feature for Cureus's web application utilizing React, that reveals SIQ reviews and ratings by hovering over any of the thousands of articles. • Created an algorithm using Ruby on Rails that allows every article to accurately pull the SIQ data from the backend. • Collaborated in the development of analytics, event tracking, and reporting utility components using Amplitude Analytics for administrative team review that led to a 10% user increase. • Built cross-browser compatible, responsive, and reusable React components designed and styled to product manager designs and specifications. • Developed, maintained, and improved the company’s web application using Agile/Scrum methodology. • Collaborated in the expansion of RSPEC tests suite utilized with Semaphore for CI/CD pipeline. • Responsible for handling live production bugs/errors and client support tickets. ### Frontend Developer @ JasteoirdS ( Project) Jan 2018 – Jan 2019 | San Francisco Bay Area • Purely JavaScript developed Asteroids game where the player navigates spaceship away from moving asteroids while having the ability to shoot and destroy asteroids. • Developed collision detection algorithm for spaceship object based on canvas location and relative position to asteroid objects allowing for better user experience. • Integrated Keystroke event listeners through the use of keycode dependency in order to properly handle and predict player direction and movement. • Utilized Howler.js in order to assimilate spaceship sound feature as well as background audio for the duration of the game. ### Software Engineer @ Rent-A-Vehicle (Project) Jan 2018 – Jan 2019 | San Francisco Bay Area • Full-stack web application where users can post their vehicles for rent or look for nearby vehicles. • Technologies: MongoDB, Express, Node.js React and Redux. • Utilized Node.js Passport authentication strategies for encrypted JSON Web Token requests allowing for stateless user identification eliminating the need for additional database queries. • Integrated Google Maps API with React Geocoder to enable post location visualization allowing users to easily find nearby vehicles available for rent. • Enabled user image uploading with post creation by incorporating Cloudinary heavy-duty image and video platform API for instant cloud storage and accessibility. ### Full Stack Engineer @ 365px (Project) Jan 2018 – Jan 2018 | San Francisco Bay Area • Full stack web application where users can upload their photographs for others users to see, like and comment. • Technologies: Ruby on Rails, PostgreSQL, JavaScript, React, Redux, Amazon Web Services. • Allowed convenient user image upload through React fie upload component. • Managed image cloud storage on Amazon Web Services by utilizing Active Storage for easy access and seamless display. • Implemented and used BCrypt library for password hashing, allowing for secure user data authentication to prevent rainbow table attacks. ### Data Analyst @ New Frontier Group Jan 2017 – Jan 2018 | Rancho Santa Margarita, California • Managed internal database and periodically produced accuracy reports for management team review and advising of data distribution, leading to cleaner and smoother data flow across all departments. • Determined strategic path for roughly 10,000 medical claims within standard 72 hour turnaround time allowing for seamless end-to-end service delivery. ### Claims Coordinator @ New Frontier Group Jan 2016 – Jan 2017 | Rancho santa margarita ### Research and data entry intern @ AIR Commercial Real Estate Association Jan 2015 – Jan 2016 | Orange County, California Area • Managed CDX database system allowing for accessible real estate data provided to all departments, leading to accurate, efficient reporting and increase in productivity by 25%. • Researched market trends and accurately reported to 7 major account holders and research department head on market targeting and advertising strategies that allowed company to hold wider market range and growth of 17%. ## Education ### Computer Software Engineering - Oct 2018 - February 2019 App Academy ### Bachelor's degree in Business Economics, minor in Management UC Irvine Jan 2012 – Jan 2017 ## Contact & Social - LinkedIn: https://linkedin.com/in/jonnatan-ortiz - Website: https://ortizjs.dev --- Source: https://flows.cv/jonnatan JSON Resume: https://flows.cv/jonnatan/resume.json Last updated: 2026-03-20