David Eric Kellerman
Verified Expert in Engineering
Front-end Developer
New York City, United States
Toptal member since May 23, 2022
David is a full-stack web developer with vast experience, from developing features to a tech lead role. His focus is on the front end, coding major high-traffic apps in React, TypeScript, and CSS. Still, he developed also REST APIs with Python, Django, and Node.js, built many types of databases, and deployed using Google Cloud, Kubernetes, and Firebase. David enjoys working with designers to fully comprehend and execute requirements in a maintainable way.
Portfolio
Experience
- CSS - 20 years
- JavaScript - 20 years
- Django - 10 years
- Python - 10 years
- Responsive UI - 8 years
- Node.js - 5 years
- TypeScript - 3 years
- React - 3 years
Preferred Environment
Visual Studio Code (VS Code), Google Cloud, Google Hangouts, Zoom
The most amazing...
...thing I've developed is an app for a healthcare company, helping people and businesses solve their problems.
Work Experience
Full-stack Developer
Kopperfield, Inc.
- Developed full-stack features related to online electrical tools with Django, Next.js and GraphQL.
- Worked closely with the growth manager to increase revenue and subscriptions via targeted UI changes.
- Fixed bugs and addressed issues on in production deployment.
Front-end Developers
Coupang - Rocket on Demand
- Served as part of a team that redesigned and upgraded the truck shipment interface.
- Upgraded the code to use a modern tech stack with Vue 3 and TypeScript.
- Delivered in iterations, using rollout flags and carefully managing changing requirements and ongoing maintenance of existing deliverables.
Web Engineer | Technical Owner
Spotify
- Led a team that maintained the artists.spotify.com website, which received over 300,000 weekly hits. Rebuilt the site from scratch using React, TypeScript, and CSS. Oversaw every aspect of the site, including deploying and tracking.
- Built a web app version of the Spotify Live client with React, working with a designer and two other team members to implement the UI under a tight deadline. Included responsive layout for mobile web browsers and web sockets for audio streams.
- Developed a search engine for artists.spotify.com site powered by Elasticsearch, including UI in React and TypeScript and Python scripts for updating indexes, and performed cluster deployments to Kubernetes.
- Onboarded several contractors and full-time employees to our team by providing training and documentation support and owning a product.
Senior Software Engineer
Castlight Health
- Built a web app from scratch for health care benefits to managers used at many large companies such as Walmart, AT&T, and Comcast.
- Used Django, PostgreSQL, and AngularJS and included responsive design, data warehouse syncing, and a full unit testing suite.
- Contributed to other projects and teams, including leading a group of 5-6 contractors in different locations to revamp the UI for the main product.
- Learned technologies such as Rails, AngularJS, Google Analytics, and Elasticsearch.
Experience
Spotify for Artists
http://artists.spotify.comI played a key role in rebuilding it from scratch using React, TypeScript, CSS, and Contentful CMS and made it fully responsive and fully tracked in Google Analytics.
Skills
Libraries/APIs
React, Node.js, Vue
Tools
Google Analytics
Languages
TypeScript, JavaScript, HTML, HTML5, Python, CSS, SQL, GraphQL
Frameworks
Next.js, Django, AngularJS, Django REST Framework
Platforms
Contentful, Firebase, Kubernetes
Storage
PostgreSQL
Other
Responsive UI, Front-end, Full-stack, i18n
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