Sean Johnson

Advanced knowledge of Business Software and Computer Science

Principal Software Engineer with 15 years of professional experience and a Master's Degree in Computer Science from Arizona State University. I’m passionate about Software Architecture, Domain Driven Design, and building maintainable applications that scale. I have significant experience with Full Stack Web Application development in TypeScript, Go, Dart, C#, Rust, and Python. During my Master's, I studied 3D Surface Generation and Optimization, Computer Architecture, and Algorithms. I love Open Source software, and I maintain multiple GitHub projects.

Aug 2022 - Present

• Focuses on Customer Success and Retention
• Develops a React and React Native application for managing Legal Services
• Develops a Flutter application for Identity Theft Protection
• Mentors engineers, regularly presenting topics to improve developer skills
• Advocates for Software Architecture quality using Domain Driven Design
• Iterates in short data-driven experiments using Google Analytics
• Creates a UI kit for Flutter applications to provide consistent UX
• Maintains internal libraries in TypeScript for React applications
• Develops Event Driven microservices in C# and ASP.NET
• Modernizes existing applications with Next.js

Febraury 2021 to April 2024

• Created a web and mobile application for Event Management and Ticket Sales
• Focused on Customer needs, iterating regularly to improve product value
• Directed Architectural decisions with Domain Driven Design, Event Sourcing, and CQRS
• Designed UX patterns to provide consistent User interactions
• Built services in Go and TypeScript, using Node.js, MongoDB, NATS, gRPC and OpenApi
• Developed applications with React, Flutter, TypeScript, Redux, RTK Query, and Material UI
• Created a custom OAuth and OpenID Connect Provider with Google and Apple support
• Maintained a large test suite with Test Driven Development
• Automated CI/CD with Kubernetes, Docker, and GitHub Actions
• Created integrations with Stripe, SendGrid, Prerender.io, and FusionAuth

January 2022 to July 2022

• Created a web application for Note Taking and “Sensemaking”
• Engineered algorithms to manage Graph data in Firebase
• Worked with TypeScript and Preact/React
• Created an End to End Test Suite for CI/CD
• Enhanced touch interfaces in a 2D whiteboard
• Optimized render and update cycles

April 2021 to December 2021

• Developed features for Urgent Care appointment software
• Built front-end software with TypeScript, React, Redux and Material UI
• Converted existing JavaScript projects to TypeScript
• Enhanced Urgent Care storefront pages with pricing information
• Developed transactional emails in Python
• Created user prompts in React Native app

April 2020 to April 2021

• Created a web application for Election Management Systems
• Created Docker/Kubernetes build and deployment
• Built front-end software with TypeScript/JavaScript, React, Redux and Material UI
• Integrated gRPC services into front-end application with gRPC-Web
• Parsed Protobuf files into TypeScript definitions
• Designed UX patterns for a Voter Registration system
• Created file upload features for Voter Registration documents
• Worked with C# ASP.NET and Node.js Microservices

May 2016 to March 2020

• Created a web application for Medical Inventory Management
• Developed features including a Shopping Cart, Hardware Manager, Inventory Setup
• Directed client-side architecture, using Dependency Injection
• Built front-end software with TypeScript, React, and MobX
• Created CSS/Stylus library and React Component library
• Implemented consistent UX patterns throughout application
• Created a Push Notification service with Node.js
• Built mobile applications with Cordova

August 2012 to April 2016

• Created full stack web applications for Online Education
• Developed tools for Course Management, and a Media Player for the Virtual Classroom.
• Optimized Course Upload tools, significantly improving performance
• Built front-end software with JavaScript and Knockout.js
• Created back-end pages with ASP.NET MVC, WebForms and Web API Services.
• Used both Microsoft SQL and MongoDB
• Created JavaScript bundling tools and patterns

December 2011 to August 2012

• Built custom Web Applications for clients with PHP and MySQL with CodeIgniter
• Created custom Websites for clients with WordPress, and Joomla
• Developed an online Curriculum Planning suite for Creighton School District
• Created UI patterns with Bootstrap

July 2010 to April 2011

• Developed commerce websites for Gaiam, Inc., United Fire, and Weil Lifestyle, LLC.
• Used Java and PostgreSQL

• Programming Languages
  • TypeScript, Go, JavaScript, Rust, C/C++
  • Python, C#, Java, Visual Basic, PHP
  • SQL, MySQL, MSSQL, PostgreSQL, MongoDB
  • CSS, Stylus, SASS, LESS, HTML
• Client-side Technology
  • React, Redux, Mobx, Preact
  • Material UI, Styled Components, Emotion, Bootstrap
  • WebPack, Gulp, Cordova
• Server-side Technology
  • Go, Gin, Node.js, Express, ASP.NET, FastAPI
  • gRPC, RESTful APIs, OpenApi, HTTP, JSON, XML
  • Microsoft SQL Server, MongoDB Server, MySQL Server, PostgreSQL Server
  • NGINX, Apache, IIS
  • OAuth, OpenID Connect, JWT, FusionAuth
• Continuous Integration and Deployment
  • Kubernetes, Docker, Docker Compose
  • Microsoft Azure, Linode
  • GitHub Actions, Azure Pipelines, GitLab CI/CD
  • Bash, PowerShell, GNU Make
  • Git, Mercurial, Team Foundation Services, SVN
• 3D Graphics
  • OpenGL, WebGL
  • Adobe Photoshop, Blender, Maya 3D, 3DS Max

• MS in Computer Science from Arizona State University in 2011
• Master's thesis on 3D surface generation
• Operating Systems, Architecture, Database, 3D Graphics, and Combinatorial Algorithms
• BA in Mathematics from Arizona State University in 2008
• Five semesters of Russian, and two semesters of Hebrew classes
• Valedictorian and Summa cum Laude graduate from Central High School in Phoenix, AZ

• Created a 3D game engine using Rust with OpenGL
• Created Headwater, a Dependency Injection and Mediator pattern library
• Created Cascade, a Reactive Functional Programming framework
• Created Artistry, a UI Style and Component library for React and Cascade
• Developed a Content Management System for ASU / NASA Space Grant

I love to balance my technical side with my artistic side. In my spare time I often Swing Dance, social dancing and competing at several international championships. I also often find myself writing, drawing, or working on various creative pursuits.