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I am a senior full‑stack developer with 6+ years of experience building dynamic, engaging web applications. I enjoy solving complex problems and delivering scalable front‑end and back‑end solutions using React, TypeScript, Node.js, and modern CMS integrations. I thrive when collaborating with product teams to craft robust architectures, improve performance, and mentor peers to raise the bar on code quality and delivery. Based in Warsaw, Poland, I’ve worked on e‑commerce platforms, HubSpot integrations, AEM projects, and cloud deployments. I love learning new technologies, exploring creative solutions, and bringing a friendly, collaborative mindset to every team I join.…I am a senior full‑stack developer with 6+ years of experience building dynamic, engaging web applications. I enjoy solving complex problems and delivering scalable front‑end and back‑end solutions using React, TypeScript, Node.js, and modern CMS integrations. I thrive when collaborating with product teams to craft robust architectures, improve performance, and mentor peers to raise the bar on code quality and delivery. Based in Warsaw, Poland, I’ve worked on e‑commerce platforms, HubSpot integrations, AEM projects, and cloud deployments. I love learning new technologies, exploring creative solutions, and bringing a friendly, collaborative mindset to every team I join.

Valentine Onah

Web Developer, Programmer, Full Stack Developer, +3

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I am a senior full‑stack developer with 6+ years of experience building dynamic, engaging web applications. I enjoy solving complex problems and delivering scalable front‑end and back‑end solutions using React, TypeScript, Node.js, and modern CMS integrations. I thrive when collaborating with product teams to craft robust architectures, improve performance, and mentor peers to raise the bar on code quality and delivery. Based in Warsaw, Poland, I’ve worked on e‑commerce platforms, HubSpot integrations, AEM projects, and cloud deployments. I love learning new technologies, exploring creative solutions, and bringing a friendly, collaborative mindset to every team I join.…I am a senior full‑stack developer with 6+ years of experience building dynamic, engaging web applications. I enjoy solving complex problems and delivering scalable front‑end and back‑end solutions using React, TypeScript, Node.js, and modern CMS integrations. I thrive when collaborating with product teams to craft robust architectures, improve performance, and mentor peers to raise the bar on code quality and delivery. Based in Warsaw, Poland, I’ve worked on e‑commerce platforms, HubSpot integrations, AEM projects, and cloud deployments. I love learning new technologies, exploring creative solutions, and bringing a friendly, collaborative mindset to every team I join.

Available to hire

I am a senior full‑stack developer with 6+ years of experience building dynamic, engaging web applications. I enjoy solving complex problems and delivering scalable front‑end and back‑end solutions using React, TypeScript, Node.js, and modern CMS integrations. I thrive when collaborating with product teams to craft robust architectures, improve performance, and mentor peers to raise the bar on code quality and delivery.

Based in Warsaw, Poland, I’ve worked on e‑commerce platforms, HubSpot integrations, AEM projects, and cloud deployments. I love learning new technologies, exploring creative solutions, and bringing a friendly, collaborative mindset to every team I join.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

German

Beginner

Russian

Advanced

Polish

Intermediate

Work Experience

Web Developer at CIONET

October 1, 2021 - June 14, 2024

Worked as a HubSpot developer handling both frontend and backend services. Developed custom modules, templates, and serverless functions tailored to business needs. Automated lead management, sales workflows, and event management processes. Improved campaign performance through configuration of workflows and email templates, collaborated on website ad campaigns, and provided technical support by fixing bugs and creating new features. Also responsible for site performance optimization and monitoring web traffic.

Software Engineer at Qurate Retail Group

June 1, 2022 - October 1, 2024

Designed and built AEM modules including Core Components and Editable Templates. Developed custom AEM components to enhance authoring experience and dynamic content delivery. Integrated Adobe CIF for seamless synchronization of product data and real-time cart functionalities. Managed server configurations and updates for dispatcher, author, and publisher servers. Implemented web frontend HTML templates and managed digital assets such as images and videos.

Full-stack Developer - Freelancer at CITI Bank and Cognizant

October 1, 2019 - October 1, 2021

Created and modified dynamic and interactive e-commerce websites using Shopify, WordPress, and Prestashop. Implemented responsive web applications using React, Angular, and Javascript. Developed signup and login flows in React.js using web APIs. Provided technical support to clients.

Full-stack Developer at UIZ GmbH Berlin

February 1, 2018 - November 30, 2019

Developed dynamic interactive websites ensuring high traffic and user experience. Fixed bugs and implemented enhancements to improve functionality and speed. Created responsive landing page apps with React. Built CMS websites using WordPress, Shopify, and Prestashop. Implemented digital marketing strategies including Google Analytics, SEO, traffic acquisition, and social media marketing for e-commerce.

Website Maintenance & customer support at DELTA

July 1, 2017 - September 30, 2017

Managed content publishing and design layout for website continuity. Streamlined navigation and increased online presence for potential customers. Provided web design consultation and created content.

Web Developer at CIONET

October 1, 2021 - Present

Developed custom HubSpot solutions including modules, templates, and serverless functions to dynamically display content tailored to business needs. Automated lead management, sales workflows, and event management processes, reducing manual tasks and improving efficiency. Improved campaign performance through configuration of workflows, email templates, and list views to enhance lead management and conversion rates. Collaborated with Community Managers and project managers on web ad campaigns, designed and built new webpages, provided technical support, fixed bugs, and optimized site performance including loading speeds and uptime.

Software Engineer at Qurate Retail Group

October 31, 2024 - July 25, 2025

Designed and built AEM modules including Core Components and Editable Templates to enhance authoring experience and dynamic content delivery. Integrated Adobe Commerce Integration Framework into AEM for real-time product and cart functionalities. Managed dispatcher, author, and publisher server configurations and updates. Developed dynamic page templates and managed various digital assets such as images and videos.

Full-stack Developer - Freelancer at CITI Bank and Cognizant

October 31, 2021 - July 25, 2025

Created and modified dynamic and interactive e-commerce websites using Shopify, WordPress, and Prestashop. Implemented responsive web applications with React, Angular, and JavaScript. Developed user authentication flows with React.js using web APIs. Provided technical support to clients.

Full-stack Developer at UIZ GmbH Berlin

November 30, 2019 - July 25, 2025

Developed dynamic and interactive websites to ensure high traffic and user engagement. Fixed bugs and implemented enhancements to improve website functionality and speed. Created responsive landing page applications using React. Built CMS websites using WordPress, Shopify, and Prestashop. Applied digital marketing strategies including Google Analytics, SEO, Traffic Acquisition, and Social Media Marketing for e-commerce.

Website Maintenance & Customer Support at DELTA

September 30, 2017 - July 25, 2025

Published and managed webpage content, maintained thematic continuity and page layout, streamlined navigation, and increased online presence. Performed web design tasks and handled consultation questions. Created content to support web presence.

Web Developer at CIONET

October 1, 2021 - Present

Responsibilities as a HubSpot developer (frontend and backend services) included developing custom solutions like modules, templates, and serverless functions for dynamic content tailored to business needs; automating lead management, sales workflows, and event management to reduce manual tasks; improving campaign performance by configuring workflows, email templates, and list views, resulting in improved lead management and conversion rates; collaborating with Community Managers and project managers on website ad campaigns; designing and building new webpages; providing technical support by fixing bugs, creating new features such as widgets, and enhancing website look and feel; monitoring, analyzing, and reporting on online traffic; optimizing site speeds, fixing broken links and images, and minimizing downtime.

Software Engineer at Qurate Retail Group

October 31, 2024 - July 25, 2025

Designed and built AEM modules including Core Components, Editable Templates, and Web Content Management solutions; developed custom AEM components to enhance authoring experience and dynamic content delivery; integrated Adobe Commerce Integration Framework (CIF) into AEM projects for product data synchronization and real-time cart functionalities; managed dispatcher, author, and publisher server configuration and updates; implemented web frontend HTML templates using AEM JSP templates; developed dynamic page templates and managed digital assets such as images, videos, documents, and fonts.

Full-stack Developer - Freelancer at CITI Bank and Cognizant

October 31, 2021 - July 25, 2025

Created and modified dynamic and interactive e-commerce websites using Shopify, WordPress, and Prestashop; implemented responsive web applications with React, Angular, and JavaScript; developed signup and login flows in React.js using web APIs; provided technical support to clients.

Full-stack Developer at UIZ GmbH Berlin

November 30, 2019 - July 25, 2025

Developed dynamic and interactive websites to ensure high traffic, page views, and user experience; fixed bugs and implemented enhancements to improve functionality and speed; implemented a responsive landing page app with React; created CMS websites using WordPress, Shopify, and Prestashop; performed digital marketing tasks including Google Analytics, SEO, traffic acquisition, and social media marketing for e-commerce.

Website Maintenance & Customer Support at DELTA

September 30, 2017 - July 25, 2025

Managed content publishing, maintained continuity of themes, designed layouts, streamlined navigation, and enhanced online presence; performed web design and consultation; created content.

Web Developer at CIONET

October 1, 2021 - Present

Responsibilities as a HubSpot developer (frontend and backend services) included developing custom modules, templates, and serverless functions to display dynamic content tailored to specific business needs, including custom objects and HubDB content. Automated processes like lead management, sales workflows, and event management to reduce manual tasks. Improved campaign performance by configuring workflows, email templates, and list views, resulting in improved lead management and conversion rates. Collaborated with Community Managers and project managers on website ad campaigns. Designed and built new webpages, provided technical support by fixing bugs, creating features, and enhancing website look and feel. Monitored, analyzed, and reported on online traffic, optimized site loading speeds, fixed broken links and images, and minimized downtime.

Software Engineer at Qurate Retail Group

October 31, 2024 - July 25, 2025

Designed and built AEM modules including Core Components, Editable Templates, and Web Content Management. Developed custom AEM components to enhance authoring experience and enable dynamic content delivery. Integrated Adobe Commerce Integration Framework (CIF) into AEM projects for real-time product data synchronization and cart functionality. Managed dispatcher, author, and publisher server configurations and updates. Implemented web frontend HTML templates in AEM JSP templates. Developed dynamic page templates and managed digital assets like images, videos, documents, and fonts.

Full-stack Developer - Freelancer at CITI Bank and Cognizant

October 31, 2021 - July 25, 2025

Created and modified dynamic and interactive web applications for e-commerce platforms using Shopify, WordPress, and Prestashop. Developed responsive web applications with React, Angular, and JavaScript. Implemented signup and login flows in React.js using web APIs. Provided technical support to clients.

Full-stack Developer at UIZ GmbH Berlin

November 30, 2019 - July 25, 2025

Developed dynamic and interactive websites with a focus on high traffic, page views, and user experience. Fixed bugs and implemented enhancements to improve web functionality and speed. Created responsive landing page applications using React. Built CMS websites using WordPress, Shopify, and Prestashop. Implemented digital marketing activities including Google Analytics, SEO, traffic acquisition, and social media marketing for e-commerce.

Website Maintenance & Customer Support at DELTA

September 30, 2017 - July 25, 2025

Managed content publishing and website maintenance, ensured thematic continuity and streamlined navigation to improve online presence for potential customers. Provided web design and consultation support. Created content.

Full-stack Developer at Citi Bank and Cognizant

October 1, 2019 - January 1, 2021

Developed web applications for e-commerce using Shopify, WordPress, and PrestaShop; implemented responsive front-ends with React, Angular, and JavaScript; built sign-up/login flows via web APIs and provided ongoing technical support.

Web Maintenance & Customer Support at Delta Location

July 1, 2017 - September 1, 2017

Published content, maintained site themes, designed navigation improvements, and provided customer support for Warsaw-based clients.