Jonathan Zielenkievicz
A New York City Based Web Developer
I create responsive, fullstack, accessible, search engine optimized websites.
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About
I'm a professional Web Developer with over 10 years of experience building high quality, optimized web solutions. I'm proficient in HTML5, CSS3, JavaScript frameworks, and various web development technologies. I leverage my creative and critical thinking to solve issues and deliver engaging, interactive websites.
For a full list of my professional work history, see the experience section below. For examples of sites I've designed, developed, and built, checkout my personal projects.
Experience
Senior Web Developer
2020 — 2025
Interpublic Group
- StrudioRx (2023-2025)
- Craft Worldwide (2022-2023)
- Freelance Consultant (2020-2022)
Built and update health care provider‐facing pharmaceutical websites, web apps, banners, and HTML emails; provide high quality maintainable code in a fast‐paced work environment.
Front End Web Developer
2015 — 2020
NYC Tourism + Conventions
Maintained and assisted with upgrades to the Official Visitor's Guide to New York City, which was visited several thousand times daily; rebranded signature marketing programs (e.g., Broadway Week, Off‐Broadway Week, Restaurant Week) and other initiatives that helped NYC tourism grow from 54 million visitors (2014) to over 66 million visitors (2019); proposed and implemented new technologies to improve front end development, performance, and speed.
Web Developer
2014 — 2015
Fly Communications
Worked with designers and project managers to create dynamic, optimized websites that met client needs and were aesthetically pleasing; built tailor‐made websites for nationally recognized brands; updated legacy code using graceful degradation for older web browsers; researched the latest developments with web technologies and incorporated best practices.
Jr. Web Developer
2009 — 2013
Sanky Inc.
Built custom websites, landing pages, HTML emails with cross‐browser/platform compatibility for nationwide nonprofits; gained proficiency in multiple client CMS platforms; led account teams on SEO techniques, resulting in top rankings for keywords.
Projects
5 Points Foundry
Boost your business with 5 Points Foundry—NYC web development studio delivering scalable, SEO-optimized, and mobile-first websites.
The Free Banano Faucet
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Change Word Case - An Online Case Converter
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Zielenkievicz.com
The portfolio site for Jonathan Zielenkievicz, where you can learn about my work experience, personal projects, skills and a little about me.
