Justin Ortiz, Software Developer in Miami, FL, United States
Justin Ortiz

Software Developer in Miami, FL, United States

Member since July 29, 2018
Justin has added more than $100 million of value for his employer multiple times. He specializes in Ruby on Rails, React, and Java development and is proficient with several other technologies. Some of his first clients included Goldman Sachs and Capital One 360, but for the last five years, he has been working in a startup environment.
Justin is now available for hire




Miami, FL, United States



Preferred Environment

Mac, JetBrains, Vi, Git

The most amazing...

...project I've worked on created impactful security work for a major financial company.


  • Senior Software Engineer | Team Lead

    2015 - PRESENT
    Financial Tech Startup
    • Trimmed 66% off the homepage load time just by applying browser-based analysis done before joining the company.
    • Helped build a new front end using the React ecosystem (including React Native, Redux, and MaterialUI) and Angular 7 ecosystem (including Angular Material).
    • Prevented catastrophic bugs and outages by suggesting incremental alternatives and escalating the situation appropriately.
    • Maintained existing services and provided architecture guidance to new services being written mostly in Java and Ruby on Rails.
    • Implemented security features necessary to defend against attackers and maintain PCI compliance.
    Technologies: Ruby on Rails, React, Node.js, Angular, Material Design, Java, Spring, JavaScript, Groovy
  • Analyst Developer

    2012 - 2015
    Goldman Sachs
    • Communicated with non-technical people (e.g., compliance officers and traders) and engineered software to do whatever they needed.
    • Improved web service latency by 90% via building an aggregation cache using the JVM and SQL.
    • Became the C# go-to person on my large global team and taught the team about the Agile methodology.
    • Used scripting languages like Ruby, Python, Bash, and DOS to automate tasks and perform file handling.
    • Built projects with a variety of technologies (including AngularJS, Java, and JavaScript) either working in a silo, with local developers or working remotely with people on the global team.
    Technologies: Java, JavaScript, AngularJS, SQL
  • Technical Consultant

    2010 - 2012
    Capital One & eBay
    • Reduced security vulnerabilities by implementing appropriate back-end coding solutions.
    • Substituted as a technical lead occasionally and applied the agile methodology to generate incremental value.
    • Tuned databases, algorithms, and caches to improve the latency of systems.
    • Integrated third-party software and APIs to improve the robustness of systems.
    • Helped construct domain models and enhance backwards-compatible services using Java, JavaScript, and SQL.
    Technologies: Java, JavaScript


  • Capital One 360 | Main eBanking Website (Development)

    I implemented a variety of security stories and worked on integrations with third-party systems on the core website used by millions of users.

  • Sample Hackathon Project (Development)

    Built a sample social network in a few hours using Ruby on Rails, Heroku, and other technologies during a hackathon. Took 100% responsibility for all of the coding and deployment.

  • Sample 30-Minute App (Development)

    Built and deployed the following app (in 30 minutes) to track personal activities using Ruby on Rails, Heroku, and other technologies. Includes authentication, authorization, and RESTful services.


  • Paradigms

    Agile, Object-oriented Programming (OOP), REST
  • Languages

    Ruby, Java, JavaScript, Python, SQL, C#, TypeScript, Groovy
  • Frameworks

    Ruby on Rails (RoR), Spring, Ember.js, Hibernate, Redux, Sails.js, React Native, Cordova, Bootstrap, Angular, Django, Grails
  • Libraries/APIs

    Node.js, jQuery, React, Google Maps, Stripe API
  • Platforms

    Linux, AWS EC2, Heroku, JVM, iOS, Meteor, MapBox, Android
  • Storage

    PostgreSQL, MongoDB, MySQL, Sybase, Redis, IBM DB2, AWS S3, MariaDB
  • Other

    Material Design


  • Bachelor's degree in Computer Science, Math, and Psychology
    2005 - 2010
    University of Pennsylvania - Philadelphia, PA, USA

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