Leo is available for hire

Leo Fabrikant

Verified Expert in Engineering

Software Developer

Location

Boston, United States

Toptal Member Since

August 18, 2022

Leo is a web front-end technology expert in React and TypeScript with extensive back-end experience with Node.js, Next.js, and Python. Technology stacks are one of the business's most important choices, and Leo prioritizes thoroughly understanding the trade-offs that all popular and effective web technologies make. Leo chooses the best tool for the job to maximize performance and code quality for whatever tech stack he works on.

CSS React Node.js TypeScript PostgreSQL Redux Next.js MobX Web Development Web Python Amazon Web Services (AWS)GraphQL AWS Lambda Django

Portfolio

Constant Contact

React, TypeScript, GraphQL, Node.js, HTML, CSS, React Apollo, MobX

Isobar

React, JavaScript, Redux, AWS Lambda, Node.js, HTML, CSS

Experience

JavaScript - 8 years CSS - 8 years HTML - 8 years React - 7 years Node.js - 5 years PostgreSQL - 4 years TypeScript - 3 years Next.js - 2 years

Availability

Part-time

Preferred Environment

MacOS

The most amazing...

...solution I've built was a complex UI and algorithm for a drag-and-drop branching workflow canvas maintaining even spacing between user-generated nodes.

Work Experience

Lead Software Engineer

2020 - 2022

Constant Contact

Introduced unique type safe workflow across a GraphQL API and front end, allowing the front end to be synced with types generated on the back end.
Built a library for creating a complex branching workflow canvas, allowing drag and drop of nodes while maintaining even spacing between them. Designed an algorithm to manage the node spacing. Published it as the organization's private npm package.
Evaluated and introduced many new technologies to the company tech stack as was requested. Assessed new technologies to potentially adopt company-wide. Technologies include TypeScript, Recoil, and GraphQL.

Technologies: React, TypeScript, GraphQL, Node.js, HTML, CSS, React Apollo, MobX

Senior Front-end Engineer

2018 - 2020

Isobar

Led a front-end team on a new initiative to provide a car and driver service in China. Built a full reservation flow, including location inputs integrated with mapping APIs. Helped deploy AWS Lambda API layer built using Node.js.
Upgraded and maintained a high-traffic enterprise web app. Led initiatives and managed junior developers. Spearheaded an upgrade to React 15 and 16 and refactored an old app-state-management system to use Redux.
Re-designed site-wide modal control architecture using React-modal to be more generic, composable, and easier to implement.

Technologies: React, JavaScript, Redux, AWS Lambda, Node.js, HTML, CSS

Experience

Participation Reports

https://www.crossref.org/members/prep/

A simple UI for searching and evaluating scientific organizations. It includes a uniquely challenging search interface as it allows a predictive search of tens of thousands of organizations done on the front end. I used extensive performance profiling and advanced technologies like web workers to identify and resolve issues. As a result, it is a very fast, highly performant predictive search feature.

Transpose Scholarly Records Database

https://transpose-publishing.github.io/

Created a web app to search through databases of scholarly journals using React Hooks. Also, I integrated with Google API to generate data from Google Sheets. Finally, I developed a custom content management system.

Skills

Languages

TypeScript, JavaScript, HTML, CSS, Python, GraphQL

Libraries/APIs

React, Node.js, MobX

Frameworks

Next.js, Redux, Django

Tools

React Apollo

Storage

PostgreSQL, MySQL

Paradigms

Web App Design

Platforms

Amazon Web Services (AWS), AWS Lambda, Web

Other

Analysis, Programming, Web Development

Certifications

JULY 2022 - PRESENT

Certification in Web Design Concepts

Brainbench

JULY 2022 - PRESENT

Certified Programmer/Analyst Aptitude

Brainbench

JULY 2022 - PRESENT

Master Certification in CSS3

Brainbench

JULY 2022 - PRESENT

Certification in JavaScript 1.8

Brainbench

Collaboration That Works

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