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Hi, I’m Zbigniew Jan Stępniewski, a Senior Frontend Developer based in Warsaw, Poland. I have over ten years of experience building scalable web applications with Vue, React, Angular, and related frontend technologies. I enjoy shaping frontend architecture, refactoring legacy code, performance optimization, and mentoring teammates to deliver robust, high-quality user interfaces. I work well in remote and cross-functional teams and am comfortable taking technical ownership to deliver value quickly. In my spare time I play guitar and compose music. You can learn more about my hobby at stepniewski.art.…Hi, I’m Zbigniew Jan Stępniewski, a Senior Frontend Developer based in Warsaw, Poland. I have over ten years of experience building scalable web applications with Vue, React, Angular, and related frontend technologies. I enjoy shaping frontend architecture, refactoring legacy code, performance optimization, and mentoring teammates to deliver robust, high-quality user interfaces. I work well in remote and cross-functional teams and am comfortable taking technical ownership to deliver value quickly. In my spare time I play guitar and compose music. You can learn more about my hobby at stepniewski.art.

Zbigniew Jan Stępniewski

Front-End Developer, Web Developer, Programmer

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Hi, I’m Zbigniew Jan Stępniewski, a Senior Frontend Developer based in Warsaw, Poland. I have over ten years of experience building scalable web applications with Vue, React, Angular, and related frontend technologies. I enjoy shaping frontend architecture, refactoring legacy code, performance optimization, and mentoring teammates to deliver robust, high-quality user interfaces. I work well in remote and cross-functional teams and am comfortable taking technical ownership to deliver value quickly. In my spare time I play guitar and compose music. You can learn more about my hobby at stepniewski.art.…Hi, I’m Zbigniew Jan Stępniewski, a Senior Frontend Developer based in Warsaw, Poland. I have over ten years of experience building scalable web applications with Vue, React, Angular, and related frontend technologies. I enjoy shaping frontend architecture, refactoring legacy code, performance optimization, and mentoring teammates to deliver robust, high-quality user interfaces. I work well in remote and cross-functional teams and am comfortable taking technical ownership to deliver value quickly. In my spare time I play guitar and compose music. You can learn more about my hobby at stepniewski.art.

Available to hire

Hi, I’m Zbigniew Jan Stępniewski, a Senior Frontend Developer based in Warsaw, Poland. I have over ten years of experience building scalable web applications with Vue, React, Angular, and related frontend technologies. I enjoy shaping frontend architecture, refactoring legacy code, performance optimization, and mentoring teammates to deliver robust, high-quality user interfaces. I work well in remote and cross-functional teams and am comfortable taking technical ownership to deliver value quickly.

In my spare time I play guitar and compose music. You can learn more about my hobby at stepniewski.art.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Spanish; Castilian

Intermediate

Polish

Fluent

Work Experience

Senior Frontend Developer at CONDA Crowdinvesting

March 1, 2025 - September 22, 2025

Led frontend development of the administration panel using Vue 3 and Nuxt; refactored legacy code; established reusable core components and provided technical leadership to the team. Created a proof-of-concept investment platform with Nuxt and Strapi (Keycloak authentication) and a Laravel/PHP backend; also built a React/NextJS proof-of-concept with Builder components. Supported an existing investment platform built with WordPress plugins, Vue 3, and Laravel/PHP.

Senior Frontend Developer at iRonin.IT

January 1, 2023 - September 22, 2025

Finished a medical web application project that was started without technical documentation. Refactored core features, improved performance, and added new functionality to deliver a polished product.

Senior Frontend Developer at Knowit

June 1, 2022 - September 22, 2025

Led the refactoring plan for the Easy Software – MyEasy Portal admin panel, including an automated test strategy. Provided technical leadership and mentored teammates; installed Cypress for end-to-end tests and began test coverage.

Senior Frontend Developer at HTD Health

June 1, 2021 - September 22, 2025

Delivered a refreshed health business site and upgraded Next.js from v7 to v10. Refactored core features and deployed the app to AWS Elastic Beanstalk. Worked on multi-project health initiatives, including the Boston Children's Hospital COVID evidance application and Rise Above Covid project, providing technical leadership and delivering complex features under pressure.

React Native Developer at JASTRZAB MEDIA PRESS Sp. z o.o.

August 1, 2020 - September 22, 2025

Loaded and presented data from WordPress REST API; displayed rich media (embedded social posts, YouTube videos); implemented background fetch for new posts and remote notifications; stored user settings with SQLite.

Senior Frontend Developer at ITSG Global

July 1, 2020 - September 22, 2025

Starfish CRM: improved app performance, performed code refactoring and bug fixes. Rydoo: enhanced performance, refactoring, bug fixing, and supported successful rebranding.

Frontend Developer at Howgorithm, Inc.

October 1, 2017 - September 22, 2025

Code refactoring and bug fixing; developing new features; preparing the app for launch.

Web Application Developer at Zepter IT

June 1, 2017 - September 22, 2025

Kentico CMS-based site improvements; responsive redesigns; building new sites; collaborating with .NET developers.

Web Developer / Team Leader at Getin Noble Bank S.A.

May 1, 2016 - September 22, 2025

Liaised between Marketing and IT departments; represented the bank before media and Google as a tech expert; contributed to plan and development of new sites and web apps.

Flash Developer at Freelancer

August 1, 2010 - September 22, 2025

Created Flash games, websites and advertisements for Polish and international clients.