David Kellerman Email & Phone Number

New York, United States

Work From Anywhere, Remote, Oo

Mar 2024-present: Yahoo! Inc (Mail) - Front-end developer (React)Jan 2024-Mar 2024 (ongoing): LocalArenaTix - Full-stack developerBuilt ticket selling applicaton from scratch for startup with Next.js and Python. I coded the initial version within a month. Afterward, we onboarded two other developers to expand the team.Built many features iteratively in coordination with non-technical founder, and with direct feedback from users.Technical aspects:* Django/Postgres backend and API - high attention to data structure and auditability* Next.js/React UI with MUI components and theming* Mobile-first responsive design - I did the initial design and then we worked with a designer to make updates* Admin UI management and complicated workflows, both manual and automated* Reporting queries and analytics (Django ORM / SQL)* Deployment to render.com and AWS (SES, SNS, Sagemaker, Pinpoint)* Customer emails, text messages, and Slack integration* Asynchronous task management* Auth management* Integration tests and end-to-end testing suite, monitoring* Worked with ML ticket price predictionJune 2022 - Nov 2023: Coupang Inc - Front-end developer (VueJS)

Stockholm, Stockholm County, Se

Technical owner on a team that built a self-serve marketing portal from the ground up using Next.js and Contentful backend. Initially worked as sole developer with a product owner to gather requirements from marketing, design, customer service, and other stakeholders. We built a full architecture over about a year, serving ~100k unique users per week. We eventually had a team of about 6 people, including other developers, design and data science.Technical highlights:* Ported entire legacy site to Next.js and Typescript* Responsive implementation of templates and components* Full analytics using Google Analytics* Project to make all images responsive had significant impact on site performance* Worked closely with marketing content people to make sure admin UI was understandable* Built custom search index with ElasticSearch cluster* Monitoring* Basic SEO* Mixed REST and GraphQL data fetching via Contentful* Accessibility, including regular audits* I18n* Full test suite with Jest and Puppeteer* Revamped user onboarding flow to interface with multiple external APIs* Full documentation of system architecture for other developers

San Francisco, California, Us

2018-2019Building features in an Angular 2 web application (Typescript, RXJS, etc.), including CSS/Flexbox work for responsive design. Heavy focus on creating reusable components, while coordinating between UX, Design, Engineering/UI, and backend Java services."Action" Product ~ 2016-2017Led a development team to build a healthcare analytics application from the ground up. Working with data provided by the data science team, I built the UI using Angular (v1) and the middle-tier using Django / Django REST Framework. I started mostly by myself, and we built up a full team over the course of a year, and sold the product to several big customers like Walmart, AT&T, and Comcast.Some of the topics I dealt with were: * User and role management * Maintaining a proper REST API * Documentation of code and best practices * Syncing app data with data warehouse * Building reusable UI components and CSS styles * Unit testing, test data, and setting up a continuous build process * Deployment scripts and managing libraries in development and production environment * Bringing other team members up to speed on the development process * Updating architecture as requirements changed and developers with different skill sets joined the team * Helping to debug performance issues with PostgreSQL * Graphs using Highcharts * Cross-browser design and testing - not quite responsive, but keeping an eye out for potential issues on mobile platformsRails Application - ~2012-2016Helped coordinate UI efforts to redesign a very big and messy product written in Rails. Included introducing some more client-heavy architecture such as Angular, creating documented components, and coordinating their use with teams in the US and India. I also worked within the existing technologies (Rails and JQuery) to build features and fix bugs.