Leo Kalshteyn

Full Stack Developer

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About Me

Experienced in Ruby on Rails and various frontend based programming languages utilizing a background in IT hardware systems. Broadly knowledgeable in the latest web technologies as well as streamlined principles and techniques in app development. Possess strong skills in conveying technical information and learning new concepts.

Contact Details

Leo Kalshteyn
New York City


Ready Set Marketing

Junior Full Stack Engineer May 2022 - Present

- Responsible for the front-end development (JavaScript, React).
- Delivering high-performance, high-quality, secure and well-documented code that is unit-tested, code reviewed and checked regularly for continuous integration. - Worked on the back-end development using Webpack and Django - Built the application utilizing Docker Desktop for managing the containers and ease of deployment

AGIL f(x)

Bubble.io Developer Jan 2022 - May 2022

- Leverage expertise in No code Apps to develop Web and Mobile Applications using the Bubble.io platform.
- Combine business objectives with user experience for client projects. - Wrote custom JavaScript and HTML/CSS for certain projects for additional features not possible with Bubble. - Utilized Stripe integration for projects requiring payment systems.

Counting Coral

Web Developer, Intern June 2021 - December 2021

- Collaborated on porting the Counting Coral website from Wix to the WordPress platform utilizing the Divi framework.
- Redesigned the Counting Coral website through collaboration with the founders, translation of stakeholder vision into achievable code, and drafting new web pages in WordPress.
- Created and maintained the user experience and interactions for compatibility across multiple devices and platforms such as mobile/responsive web. - Integrated JavaScript functions for certain features on the pages of the main application.

East Coast, LLC

Technician April 2016 - May 2021

- Installed, configured, and provided on-site support for wired/wireless surveillance equipment, including Network Video Recorders (NVR), IP Cameras (IPC), Wi-Fi access points (AP) and associated network cabling.

Opus Energy, LLC

Technician September 2014 - February 2016

- Installed, serviced and troubleshooted HVAC equipment including control modules, actuators, temperature/pressure sensors and other measuring devices, circulating pumps, and various fans.
- Control, adjustment and operational checks of components to assure reliability of HVAC equipment

St. Petersburg Collection Inc.

Web Developer, Technician May 2013 - September 2014

- Designed, created, managed company's website including product listings for the entire merchandise library.
- Designed and installed proprietary LED-based illumination system for main Manhattan storefront.


Flatiron School

Full Stack Web Engineering February 2020

Hunter College

Computer Science March 2017


  • HTML & CSS
  • SASS
  • Ruby, Rails & Python
  • Vanilla Javascript
  • React & Redux
  • Node.js
  • MySQL & PostgreSQL
  • WordPress
  • Heroku, Git & Linux