Josiah Mann, Developer in Springfield, United States
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Josiah Mann

Verified Expert  in Engineering

Full-stack Developer

Springfield, United States
Toptal Member Since
October 20, 2015

Josiah is a senior full-stack developer with a strong background in all things JavaScript and front end. He loves JavaScript and building applications with Laravel. He is a CSS wizard who's built a great number of web apps from scratch, worked on enterprise web front-end teams, taught others to become front-end developers, and mentored junior front-end devs. Josiah's latest project was founding a SaaS company he ran successfully for four years before being acquired (LAMP stack/AWS/Laravel/Vue).


Investor Deal Room
PHP, Vue, Amazon Web Services (AWS), Linux, CSS3, JavaScript...
JavaScript, SCSS, AngularJS, jQuery, Sass, Web App Development...
Craft CMS, Sketch, WordPress, PHP, JavaScript, CSS, HTML, jQuery, Sass...




Preferred Environment

Git, Visual Studio Code (VS Code), MacOS

The most amazing...

...thing I've developed was my last SaaS application that I built with Laravel and Vue, deployed and managed on AWS, and had many integrations.

Work Experience

Founder, CTO, and Lead Full-stack Developer

2018 - 2022
Investor Deal Room
  • Build a SaaS application from the ground up using PHP, Laravel, and Vue.
  • Built and designed amazing, cutting-edge user experiences with JavaScript that served multiple stakeholders.
  • Built and maintained a living style guide in HTML, SCSS, and JavaScript that greatly increased front-end dev efficiency and informed all new feature patterns.
  • Built and maintained a system for continuous deployment using AWS and Envoyer.
  • Designed the user experience starting in the browser using high-quality templates.
  • Built out dozens of integrations (payment integrations, DocuSign embedding, Mailgun, etc.).
  • Architected a multi-database, multi-tenant database solution.
Technologies: PHP, Vue, Amazon Web Services (AWS), Linux, CSS3, JavaScript, Web App Development, Front-end Development, Single-page Applications (SPA), Laravel 5, Pixel Perfect, User Interface (UI), HTML, UI Design, GitHub, Front-end, Responsive Design

Senior UI Developer | Lead UI Developer

2017 - 2018
  • Delivered JavaScript features on a Fortune 100 company's website using AngularJS.
  • Maintained and expanded the front-end style guide for maximum modularity, scalability, and reuse while providing accessibility across all device types.
  • Built UI components and unit tests in Angular 2/4. Helped migrate to Angular 2, then Angular 4.
  • Participated in regular code reviews with team members.
  • Provided opinions and worked with the design team to create reusable architecture.
Technologies: JavaScript, SCSS, AngularJS, jQuery, Sass, Web App Development, Front-end Development, Single-page Applications (SPA), Laravel, Vue, Pixel Perfect, User Interface (UI), HTML, UI Design, GitHub, Responsive Design

Senior Front-end Web Developer

2015 - 2016
  • Led the development of client websites from designs.
  • Brought Sketch designs to life using HTML, CSS, and JavaScript.
  • Created a quality user experience across multiple browsers.
  • Developed cutting-edge animations using a custom JavaScript library and CSS animations.
  • Tested code across multiple devices and screen sizes.
Technologies: Craft CMS, Sketch, WordPress, PHP, JavaScript, CSS, HTML, jQuery, Sass, Web App Development, Front-end Development, Pixel Perfect, User Interface (UI), GitHub, Responsive Design

Front-end and WordPress Theme Developer

2014 - 2016
Buddyboss, Inc.
  • Coded custom WordPress themes from the PSD design to WordPress standards.
  • Installed and configured premium WordPress themes.
  • Coded styles for complex social networking interfaces.
  • Provided responsive development and UX testing for websites.
Technologies: MySQL, jQuery, JavaScript, PHP, CSS3, HTML5, WordPress, Front-end Development, Pixel Perfect, User Interface (UI), HTML, GitHub, Responsive Design


2012 - 2014
First Principles Web Design
  • Designed custom websites for small businesses using WordPress.
  • Created user-friendly back ends for clients to easily edit websites.
  • Taught a course on how to create custom WordPress themes.
  • Developed custom WordPress themes for design agencies.
Technologies: Responsive Web Apps, WordPress, Web Design, JavaScript, Adobe Photoshop, CSS3, HTML5, Front-end Development, User Interface (UI), HTML, UI Design, GitHub, Front-end, Responsive Design
Led front end development efforts for the creation of a new company website that integrated with an existing back-end API.

I created the CSS style and component guide, custom animations, and JavaScript components. I also contributed to the integration with Node.js API.

Craft CMS
Led the front-end development of new design templates to accompany major version release for Craft CMS and integrated with the CMS.

Craft CMS | Commerce Component
Led the development on a new website to accompany a product launch for a new commerce component of the Craft CMS. Worked with designers to craft a great user experience using JS, CSS3, SVG animations, and more.
Led the front-end development of a new company website utilizing the latest technologies.


jQuery, Vue, Mustache, Atomic CSS, Backbone.js, JavaScript Charting, Node.js


Git, Gulp, NPM, GitHub, Sketch, Adobe Photoshop, Grunt, Sublime Text 3


Laravel 5, Angular, Bootstrap, Laravel, AngularJS


HTML, CSS, PHP, Sass, SCSS, JavaScript, HTML5, CSS3, Less


BEM, Object-oriented Programming (OOP), UI Design, Responsive


WordPress, Amazon Web Services (AWS), MacOS, Craft CMS, Linux, Visual Studio Code (VS Code)



Industry Expertise

Web Design


WordPress Themes, Web App Development, Single-page Applications (SPA), Minification, Software Development, Front-end Development, User Interface (UI), Pixel Perfect, Atomic Design, Front-end, Responsive Design, Responsive Web Apps

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