Sean McCall, Developer in San Diego, CA, United States
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Sean McCall

Verified Expert  in Engineering

Design Developer

San Diego, CA, United States
Toptal Member Since
August 21, 2019

Sean is a senior developer with a broad and versatile skillset who works heavily in React, React Native, and Node.js. He has an entrepreneurial spirit and a midwest work ethic and has worked with a large range of companies of different sizes and scopes. His strong theoretical and practical background in software architecture, UI design, DevOps, and business consulting makes him extremely capable of bringing success to projects of any size.


Amazon Web Services (AWS), CircleCI, Mailgun, Node.js, React Router...
React Native, React, CircleCI, Python, Jenkins, Hugo, WordPress
Salesforce, SAP, SQL, Microsoft Excel, Python, React Native




Preferred Environment

Git, Xcode, WebStorm, MacOS

The most amazing...

...thing I've built is a systems integration testing automation app that saved a client over $1 million per year in saved time.

Work Experience

CEO and Co-founder

2017 - PRESENT
  • Designed and built a single page application all-in-one social workspace platform from scratch, now used by over 10,000 people.
  • Shipped an integrated file system, events management, members/guests, teams/roles, permissions structure, tasks, wiki, and much more.
  • Designed and implemented a REST API to access all functionality.
  • Ported React application to React Native and built a mobile app.
  • Compartmentalized front and back-end functionality into generalizable functions.
Technologies: Amazon Web Services (AWS), CircleCI, Mailgun, Node.js, React Router, React Native, React, Meteor

Full-stack Developer

2013 - 2018
  • Implemented three separate multi-language and currency eCommerce shops for European jewelry, sports, and shopping sites.
  • Provided graphic design work for over 100 clients over 5 years - all work received through referrals.
  • Automated deployment of static websites using Hugo and education of small business owners on usage.
  • Created a custom WordPress theme that better handles multi-lingual and multi-currency shops.
  • Built business process workflow builder to integrate multiple SaaS services using Angular, Express.js, and Python.
  • Conceptualized and developed a group study/university planning application with events/documents/groups/calendar functionality using Angular/MongoDB/Express.js.
Technologies: React Native, React, CircleCI, Python, Jenkins, Hugo, WordPress

Working Student

2016 - 2017
  • Created an automation app using Node, Express.js, and SAP software that saved the client over $1 million per year in saved time by automating global systems integration testing for major chip manufacturer.
  • Named contributor on internal assets relating to software architecture.
  • Conducted business risk assessments on the software landscape for major financial institutions across the world.
Technologies: Salesforce, SAP, SQL, Microsoft Excel, Python, React Native

UI/UX Designer and Developer

2015 - 2016
Eichmeister Advertising Agency
  • Conceptualized and built multiple sites and marketing funnels for European SMBs.
  • Brought in new business and expanded existing business accounts with creative customer offerings.
Technologies: Amazon Web Services (AWS), WordPress, React Native, React

Head of Marketing

2014 - 2016
Clarion River Brewing Company
  • Coordinated and launched a major marketing campaign that reached tens of thousands.
  • Grew online presence from 0 to over 6,000 followers in 1 week, direct contribution to the company's bottom line.
Technologies: LinkedIn API, Facebook API, WordPress


All-in-one social workspace for teams and organizations. Automate, collaborate, align, and get organized. Unaty gives leaders all they need in one tool.


JavaScript, PHP, HTML, CSS, Python, Hugo, SQL


React Native, Angular, Express.js


React, React Router, Node.js, React DnD, LinkedIn API, Facebook API, React Redux


WebStorm, CircleCI, Xcode, Git, Microsoft Excel, Jenkins, Sublime Text


MongoDB, Amazon S3 (AWS S3)


Design, App UX, UX Flows, UX Architecture, Architecture, SAP




iOS, MacOS, Meteor, Mailgun, WordPress, Amazon Web Services (AWS), Android, Firebase, Salesforce

2015 - 2018

Progress towards a Bachelor's Degree in Business Administration

Ludwig-Maximilians-Universität - Munich, Germany

Collaboration That Works

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