Avram Eisner, Developer in Seattle, WA, United States
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Avram Eisner

Front-end Web Developer

Seattle, WA, United States

Toptal member since June 4, 2020

Bio

Passionate about the web, Avram's been working as a front-end developer for several years. Where Avram’s value to a project is most evident is in his ease in collaborating with designers to bring their designs to life and in developing complex single-page apps in React and Redux. However, recently, he’s also been intrigued in the potential of Svelte and Sapper to combine server-side with client-side rendering. When you work with Avram, you can expect to receive quality code delivered on time.

Portfolio

Hazel Health
React, TypeScript, Python 3, HTML5, Zustand, Claude Code, Front-end...
Persefoni
React, Next.js, TypeScript, Radix UI, Jest, HTML5, Front-end...
D-Wave
React, Python 3, Front-end, User Interface (UI), Figma, User Experience (UX)...

Experience

  • CSS - 20 years
  • JavaScript - 20 years
  • HTML5 - 20 years
  • React - 10 years
  • Express.js - 5 years
  • Node.js - 5 years
  • Jest - 5 years
  • Redux - 4 years

Preferred Environment

Git, Visual Studio Code (VS Code), Express.js, Node.js, Webpack, Claude Code, AI Tools

The most amazing...

...thing I've built is a 3D Tetris clone using WebGL. You can play it at my GitHub page (Avrame.github.io/3D-Tetris).

Work Experience

Senior Front-end Web Developer

2023 - 2025
Hazel Health
  • Built and launched a React and TypeScript clinical form system that reduced therapist evaluation time by 30%, improving patient throughput and data accuracy.
  • Collaborated with designers to develop a React-based calendar interface for scheduling and tracking mental health visits, streamlining weekly planning for school coordinators.
  • Worked closely with back-end engineers to design and build an interface for handling insurance verification requests.
Technologies: React, TypeScript, Python 3, HTML5, Zustand, Claude Code, Front-end, User Interface (UI), Figma, User Experience (UX), AI-assisted Development, UI Components, CSS-in-JS

Senior Front-end Web Developer

2022 - 2023
Persefoni
  • Delivered the Scope 3 emissions data exchange tool, enabling companies to automate supplier data collection and sustainability reporting.
  • Built reusable chart, graph, and table components for Kore UI, Persefoni’s internal design system, improving product consistency and developer velocity.
  • Consolidated data-fetching and i18n code into shared packages within the monorepo, reducing duplication and improving maintainability.
Technologies: React, Next.js, TypeScript, Radix UI, Jest, HTML5, Front-end, User Interface (UI), Figma, User Experience (UX), AI-assisted Development, UI Components, GraphQL, CSS-in-JS

Senior Front-end Web Developer

2020 - 2022
D-Wave
  • Acted as a front-end developer for the new Leap Admin portal, simplifying project and user management for the quantum computing platform.
  • Created an accessible React component library using functional components and hooks.
  • Implemented front-end security best practices to mitigate XSS and injection vulnerabilities.
  • Wrote comprehensive unit tests, reducing regressions and improving release confidence.
Technologies: React, Python 3, Front-end, User Interface (UI), Figma, User Experience (UX), UI Components

Front-end Engineer

2020 - 2020
Verizon Media
  • Built an augmented reality web app for authoring and sharing 3D AR content.
  • Migrated the codebase from JavaScript to TypeScript, improving stability and developer experience.
  • Developed utilities to pack GLTF and unpack GLB 3D model files.
Technologies: React, ECMAScript (ES6), TypeScript, Redux, Webpack, Amazon Web Services (AWS), Front-end, User Interface (UI), UI Components

Front-end Web Developer

2019 - 2020
Disney
  • Rewrote the OneID account system, which is used across all Disney subsidiaries, in React and Redux.
  • Used Jira to track and fix bugs with the old OneID account system written in Angular 1.3.
  • Collaborated with different teams to deliver a new functionality localized in over a dozen different languages.
Technologies: Redux, React, JavaScript, Front-end, User Interface (UI), UI Components

Front-end Web Developer

2019 - 2019
Level 11
  • Built a sophisticated map-based web app that monitors vaccine refrigerators in Nigeria. Temperature data was collected and transformed into charts, graphs, and map overlays.
  • Worked directly with clients to quickly iterate on the design and functionality.
  • Increased performance of a complex web app and fixed numerous bugs.
Technologies: Deck.gl, Mapbox, Redux-Saga, Redux, React, JavaScript, Front-end, User Interface (UI)

Front-end Web Developer

2017 - 2018
Flexe, Inc.
  • Spearheaded Flexe’s new React-based internal admin tool for the operations team, reducing data-entry errors, and time needed to create warehouse reservations for customers.
  • Moved the new admin tool to Google Cloud with automatic deployments, streamlining the deployment pipeline.
  • Added RESTful routes to the Ruby on Rails application, allowing for the creation of a new admin front end built in React.
Technologies: Ruby on Rails (RoR), React, TypeScript, Front-end, User Interface (UI), User Experience (UX), UI Components

Senior Web Developer

2015 - 2017
Mobiquity, Inc.
  • Learned quickly to work with Angular and React on the job.
  • Leveraged my knowledge of responsive web development to create websites and web apps that work on all screen sizes.
  • Built a medical survey app for Amazon's voice-enabled service, Alexa.
Technologies: Git, React, Angular, JavaScript, Node.js, Amazon Web Services (AWS), Front-end, User Interface (UI), UI Components

Front-end Web Developer

2012 - 2014
Expedia
  • Built and tested front-end code for Expedia's mobile website. Backbone.js was used to create reusable interactive components throughout the site.
  • Developed a library of JSP tags that formed a front-end UI toolkit—giving back-end developers throughout the company the ability to create clean, standards-compliant pages.
  • Wrote a complete suite of unit tests for the UI Toolkit framework, including Jasmine tests for JavaScript and JUnit tests for Java components.
Technologies: Jakarta Server Pages (JSP), Java, Backbone.js, JavaScript, Front-end, User Interface (UI), UI Components

Experience

Nestlé's GoodNes Alexa Skill with Accompanying Website

I built an Amazon Alexa skill for Nestlé that lets users browse through and follow recipes with their voice. It also has an accompanying website that can be loaded and updated based on the voice commands given to Alexa. Users can browse recipes, navigate through a recipe's directions, and watch instructive videos all using their voice, so their hands are free to work in the kitchen.

Vaccine Refrigerator Monitoring Web App

https://www.intellectualventures.com/what-we-do/global-good-fund
This project was built for Global Good, a sub-organization within Intellectual Ventures. They needed a better method of monitoring the temperature fluctuations of vaccine refrigerators in various African countries.

The web app was built in React and Redux and uses MapBox for displaying a map of the country. The user can zoom in and out of the map to see average temperature fluctuations layered over the different states and regions. Temperature data is also provided in a table and a chart to show changes over time.

Operations Web App

I was responsible for creating a new web app for the operations team at Flexe, an online marketplace for warehouse space. The current system was built in Ruby on Rails and consisted of a dozen or more different pages that were automatically generated from database tables. Creating new warehouse reservations with the old process was slow, tedious, and error-prone.

I created the new web app using React on the front end, and Node.js/Express.js on the back end. The Express.js app would act as a middle layer between the front end and the Ruby on Rails app. I also wrote new API endpoints in the Ruby on Rails app that returned JSON for the middle layer.

Education

2002 - 2005

Bachelor's Degree in Informatics

University of Washington - Seattle, WA, United States

Skills

Libraries/APIs

React, Node.js, Redux-Saga, Backbone.js

Tools

Git, Claude Code, Figma, Webpack

Languages

JavaScript, TypeScript, HTML5, CSS, HTML, ECMAScript (ES6), GraphQL, Java, Python 3

Platforms

Visual Studio Code (VS Code), Mapbox, Amazon Web Services (AWS)

Frameworks

Redux, Jest, Express.js, Deck.gl, Ruby on Rails (RoR), Angular, Jakarta Server Pages (JSP), Next.js

Other

Front-end, User Interface (UI), UI Components, User Experience (UX), AI-assisted Development, AI Tools, CSS-in-JS, Information Architecture (IA), Radix UI, Zustand

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