John Hinrichs, Developer in Chicago, IL, United States
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John Hinrichs

Verified Expert  in Engineering

Software Developer

Chicago, IL, United States
Toptal Member Since
September 24, 2021

John is a full-stack Ruby on Rails, React, and Vue developer with seven years of experience. He believes in delivering business value to clients through clean, tested, and simple code that is easy to extend. John enjoys working through challenging back-end problems as well as creating delightful front-end user experiences.


Ruby, Ruby on Rails (RoR), Vue, Vuex, PostgreSQL, JavaScript, CSS, TypeScript...
Ruby, Ruby on Rails API, React, Redux, Agile, RSpec, Jest, React Native...
Ruby, Ruby on Rails API, React, Amazon Web Services (AWS), JavaScript...




Preferred Environment

Ruby, Ruby on Rails (RoR), React, PostgreSQL, Vue

The most amazing...

...thing I've built is an admin portal for an operations team that gave them intuitive, simplified access to key data for a streamlined workflow to help customers.

Work Experience

Senior Software Engineer

2021 - 2022
  • Handled the internal tools of a monolithic Rails API and Vue app, including project and call management functionality.
  • Served as technical lead for building a Chrome extension and revamping the project request process between clients and admins.
  • Integrated Twilio voice functionality to facilitate over 300 business-critical calls per week.
Technologies: Ruby, Ruby on Rails (RoR), Vue, Vuex, PostgreSQL, JavaScript, CSS, TypeScript, Amazon Web Services (AWS)

Lead Software Engineer

2018 - 2021
  • Owned the production system, including a Rails API, four separate React and Redux UI apps, and a React Native mobile app for iOS and Android.
  • Built the back end and UI features for all products, including creating SSO flows, internationalizing a React app and Rails API, and building a custom paid membership feature.
  • Managed the development work of three different remote contracting companies for various features, including story planning, code review, and production release.
  • Worked with 20+ external partners, with multiple custom one-to-one integrations.
Technologies: Ruby, Ruby on Rails API, React, Redux, Agile, RSpec, Jest, React Native, JavaScript, PostgreSQL, Ruby on Rails (RoR), CSS, HTML, TypeScript, Amazon Web Services (AWS), GitHub

Full-stack Software Engineer

2015 - 2018
  • Developed ad tech software with data fetching and aggregation, analytics, billing, and reporting.
  • Wrote various asynchronous data cleanup jobs for an approximately 260GB PostgreSQL production database.
  • Worked extensively with five separate third-party ad server APIs, including Google and Facebook.
Technologies: Ruby, Ruby on Rails API, React, Amazon Web Services (AWS), JavaScript, PostgreSQL, RSpec, Ruby on Rails (RoR), CSS, HTML

Customer Success Engineer

2014 - 2015
Conductor, Inc
  • Served as the first responder for bug fixes and urgent feature requests, completing around 75 bug fixes and improvements.
  • Learned Java, Spring, JUnit, and MySQL on the job and deepened existing knowledge of Backbone.js.
  • Worked with several teams across the organization to assess product functionality and diagnose bugs.
Technologies: Java 8, Backbone.js, Marionette.js, Ruby, JavaScript, CSS, HTML

CarAdvise App
This responsive web app allows customers to schedule, approve, and pay for maintenance services for their vehicles at brand-name nationwide auto stores such as Firestone, Jiffy Lube, Pep Boys, and Midas.

I was the core developer for many UI and back-end features.
2001 - 2006

Bachelor's Degree in Mathematics

University of Illinois Urbana-Champaign - Urbana, IL, EUA


Ruby on Rails API, React, Vue, Vuex, jQuery, Backbone.js, Marionette.js


RSpec, GitHub, Jira


Ruby on Rails (RoR), Redux, Jest, React Native


Ruby, JavaScript, CSS, HTML, TypeScript, Java 8






Amazon Web Services (AWS)



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