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Javier A. — Senior Ruby on Rails Developer from Mexico

Javier A.

Senior Ruby on Rails Developer

Mexico 6+ years
Open to offersNew to Platform
Languages
EnglishSpanish
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About

Javier V. is a seasoned Ruby on Rails Fullstack Developer with over 12 years dedicated to building scalable web applications across fintech, edtech, SaaS, healthcare, airline, banking, and government sectors. He has led distributed development teams for companies such as Gusto Inc., Acima, Betterment, and INIDETAM, overseeing full-stack solutions from payment processing and payroll systems to authentication infrastructure and compliance-focused LMS platforms. Javier’s expertise encompasses extensive work with Ruby on Rails, Java, and modern frontend frameworks like React, along with deep experience in architecting and integrating microservices, GraphQL APIs, and data synchronization systems. He has played a pivotal role in modernizing legacy stacks, ensuring regulatory compliance in healthcare and finance, and authoring educational resources as an instructor and published book author.

Experience

  • Ruby on Rails developer

    Gusto Inc. · 2022 — 2023
    Led the integration of Keycloak SSO for enterprise-level authentication and user synchronization. Developed tax calculation integrations via the Taxcaster gateway and payment processing functionalities for the Merchant Portal. Refactored legacy Grape API endpoints to Rails controllers to standardize the service architecture. Designed a service layer for contract management, ensuring comprehensive RSpec test coverage. Oversaw database migrations, Sidekiq background jobs, and Redis caching to ensure high-availability operations.

  • Ruby on Rails Tech Lead

    Gusto Inc. · 2022 — 2023
    Led a team of five engineers in launching a new learning management system (LMS) product line for mandatory workplace compliance training, broadening revenue streams for Gusto. Worked in collaboration with Product teams to integrate third-party anti-harassment course content, certificate delivery, and completion tracking. Architected a full-stack platform utilizing a Rails backend, React frontend, and GraphQL APIs with a strong focus on scalability. Increased test coverage from 15% to 70% using Jest and RSpec, establishing quality standards to decrease production bugs.

  • Ruby on Rails Fullstack developer

    Gusto Inc. · 2019 — 2022
    Migrated JavaScript codebase to TypeScript (TSX) to enhance type safety and developer experience. Developed new features for payroll processing workflows utilizing Rails for backend and React for frontend. Implemented GraphQL endpoints for improved data fetching and API modernization. Enhanced test coverage with Capybara for integration tests and Jest for frontend unit tests. Worked closely with cross-functional teams within an agile framework.

  • Ruby on Rails Senior Developer

    Enroute Systems (Betterment) · 2022 — 2022
    Developed components for Betterment's automated investment platform, supporting over 900K investors managing $56B in assets. Integrated Java microservices using the HerModel gem for portfolio management. Provided mentorship to junior developers and created an internal Ruby training curriculum aimed at enhancing team expertise. Established extensive test coverage through the use of RSpec, Capybara, and Selenium to meet financial compliance requirements.

  • Software Engineer (Ruby/Go)

    Rocket Power (Dispatch Health) · 2021 — 2022
    Constructed an integration platform that connected Indeed's job matching system with external CRMs and ATS platforms such as Bullhorn and Oracle. Developed RESTful and SOAP API integrations to manage authentication and credentials while ensuring bidirectional data synchronization. Created a service layer utilizing the HTTParty gem to standardize integration patterns across various vendor APIs. Built a comprehensive test suite with RSpec, Faker, and FactoryBot to ensure reliability of the integrations.

  • Tech Lead Ruby on Rails

    Coco Languages (Language Learning Startup) · 2019 — 2020
    Led a three-engineer team to develop a music-based language learning platform that integrated with the Spotify API and various lyrics services such as Genius and Musixmatch. Designed the Rails backend to utilize Oxford Dictionaries, Google Translate, MeaningCloud, and Unsplash APIs for generating contextualized vocabulary flashcards using a spaced repetition algorithm. Developed an interactive karaoke interface with React, coding lyrics by word frequency to enhance language acquisition. Managed the deployment and scaling of the application on AWS Beanstalk, with CI/CD processes in place using Heroku and Firebase.

  • Java Developer

    Softtek (Southwest Airlines) · 2019 — 2019
    Migrated legacy C flight scheduling services to Spring Boot, modernizing Southwest Airlines' operational infrastructure. Developed a TIBCO SmartSockets publish-subscribe client to provide real-time flight updates across distributed systems. Achieved migration success without prior experience in C language, improving existing test coverage through JUnit, Mockito, and PowerMock. Enhanced code quality and maintainability utilizing Sonar static analysis.

  • Java Developer

    BSD Enterprise (Afirme & Ternium) · 2018 — 2019
    Modernized the legacy ERP system for Ternium by migrating the BC4J data layer to Hibernate and refactoring the codebase using various design patterns including DAO and DTO. Contributed to the maintenance of Banca Afirme's banking system by developing Oracle PL/SQL stored procedures and triggers for processing financial transactions. Built Spring-based services while adhering to enterprise architectural patterns for both clients, deploying applications on IBM WebSphere and Oracle WebLogic servers.

  • Ruby on Rails developer

    Kodikas · 2016 — 2018
    Created OMILOS ERP from the ground up, a Rails-based administrative system focused on small and medium business sales, purchases, and expense management. Implemented user authentication via Devise and authorization through CanCanCan, along with Google Cloud Storage integration using Carrierwave and Fog for file uploads. Deployed a full-stack application on Heroku using PostgreSQL for the database and Bootstrap for the frontend.

  • Software Engineer

    INIDETAM (Mexican Navy) · 2011 — 2016
    Developed tactical training simulators aimed at educating Mexican Navy officers, facilitating real-time visualization using NASA WorldWind and JavaFX. Created a scenario generation system for the Simulador Táctico de la Armada de México to support strategic training exercises with georeferenced military symbols. Architected a real-time naval operations mapping prototype using Ruby on Rails, LeafletJS, and RabbitMQ for effective inter-system communication. Built an interactive 3D ship navigation simulator deployed at the Naval Museum of Veracruz for public education purposes.

Skills & Expertise

Software and Mobile DevelopmentPHP DeveloperRuby on Rails Developer

Education

  • Bachelor's degree in computer science
    Universidad Mexicana · 2008 — 2011
  • Bachelor's degree in Theology
    Institution not specified