Hi, I’m Nico Kastunowicz. I’m a frontend engineer focused on building scalable, user-centric applications. I collaborate with product teams to shape features, contribute to architectural decisions, and deliver reliable, high-quality releases. I have experience working on full-stack tasks in a JavaScript/ECMAScript stack, primarily with React, React Native, Redux, TypeScript, and Node.js. I enjoy turning complex ideas into accessible interfaces and shipping polished experiences for web and mobile.…

Nico Kastunowicz

Hi, I’m Nico Kastunowicz. I’m a frontend engineer focused on building scalable, user-centric applications. I collaborate with product teams to shape features, contribute to architectural decisions, and deliver reliable, high-quality releases. I have experience working on full-stack tasks in a JavaScript/ECMAScript stack, primarily with React, React Native, Redux, TypeScript, and Node.js. I enjoy turning complex ideas into accessible interfaces and shipping polished experiences for web and mobile.…

Available to hire

Hi, I’m Nico Kastunowicz. I’m a frontend engineer focused on building scalable, user-centric applications. I collaborate with product teams to shape features, contribute to architectural decisions, and deliver reliable, high-quality releases.

I have experience working on full-stack tasks in a JavaScript/ECMAScript stack, primarily with React, React Native, Redux, TypeScript, and Node.js. I enjoy turning complex ideas into accessible interfaces and shipping polished experiences for web and mobile.

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Skills

Experience Level

JavaScript
Expert
TypeScript
Expert
React Native
Expert
CSS
Expert
GraphQL
Intermediate
Node.js
Intermediate
Adobe XD
Intermediate
Docker
Intermediate
SQL
Intermediate
Figma
Intermediate
Web Design
Intermediate
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Language

German
Fluent
English
Fluent
Polish
Advanced
French
Intermediate

Work Experience

Frontend Engineer at Valsight
October 1, 2021 - June 1, 2025
Designed and built scalable frontend features, contributed to architecture, and supported smooth, reliable release processes.
Web- & Mobile Developer at Ventzke-Media
October 1, 2020 - October 1, 2021
Designed and built a custom e-commerce shop for the fashion label, collaborating with product and engineering teams to implement user-focused, scalable frontend features.
E-Commerce Store Owner / Freelance Frontend Developer at Fashion Label (Marlen Raymakers)
August 1, 2015 - December 1, 2025
Collaborated with product and engineering teams to design and implement user-focused, scalable frontend features, contributed to architectural decisions, and supported smooth, reliable release processes.

Education

Master in Business Informatics at Freie Universität Berlin
January 11, 2030 - January 31, 2026
Bachelor in Business Administration at University of Potsdam
January 11, 2030 - January 31, 2026

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Retail, Media & Entertainment, Professional Services
    paper E-Commerce Shop for fashion label

    Designed and built a custom e-commerce shop for the fashion label Marlene Raymakers. It is connected to a custom backend built with Payload CMS and Stripe for payment processing and was designed in Figma.