08/24/2026 updated

**** ******** ****
100 % available

Freelance Front-end Developer & Product Owner

Zeewolde, Netherlands
Only remote
VWO Diploma - S.G. Lelystad (1999)
Zeewolde, Netherlands
Only remote
VWO Diploma - S.G. Lelystad (1999)

Profile attachments

Resume-BJ_van_Hummel.docx

About me

I am an experienced Senior Software Developer with 20+ years in IT, specialising in React, TypeScript and JavaScript, with C#/.NET and PHP experience. Strong in Design Systems, accessibility, APIs and UI/UX. Experienced Product Owner and Consultant, available for international freelance work.

StorybookGitHub CopilotGitHub ActionsTailwind CSSViteContentfulASP.NETJavaScriptPHPUser Experience (UX)Web AccessibilityHTML5C Sharp (Programming Language)Cascading Style Sheets (CSS)Certified Scrum Product OwnerGitHubUser Interface DesignPostgreSQLNode.jsNext.jsSeleniumTypeScriptReact.jsCypress (Programming Language)GitSyntactically Awesome Style Sheets (SASS)Backend ProgrammingMaterial UIFull Stack DevelopmentGraphQLReact NativeFront End Software DevelopmentRestful ApiDocker
React, TypeScript & Next.js Development
Extensive experience developing large-scale applications with React, TypeScript and JavaScript. Experience with Next.js, reusable component architecture, Design Systems, Material UI, Tailwind CSS, Storybook, REST/OpenAPI and GraphQL. Tooling includes Vite, Webpack, Babel, NPM, PNPM and Yarn.

Frontend Architecture & Design Systems
Experience building and maintaining scalable frontend applications, reusable component libraries and Design Systems. Worked with Material UI and Atomic Design principles, collaborating closely with UX designers, backend developers and product teams.

Accessibility & WCAG
Recent hands-on experience implementing EAA and WCAG 2 accessibility requirements in production applications. Experience improving existing components and pages, Design Systems and accessible user interfaces.

C#/.NET & Full Stack Development
Full-stack experience with C#/.NET and JavaScript, maintaining and extending existing applications and integrating frontend applications with backend services and APIs. Experience with Contentful, SQL databases and production incident management.

PHP & Backend Development
Professional experience with PHP, MySQL and PostgreSQL, including web application development, REST APIs, Linux, Apache and Docker. Additional experience with Node.js.

Testing & Quality Assurance
Experience with Jest, Cypress, Puppeteer and Selenium, automated frontend testing, accessibility testing and CI/CD. Strong focus on maintainable code, reusable components and software quality.

Cloud, DevOps & CI/CD
Experience with Azure DevOps, Azure Pipelines, GitHub Actions, AWS, Docker, Git/GitHub and CI/CD workflows across professional software projects.

Product Ownership & Agile
Certified Professional Scrum Product Owner with hands-on experience in backlog management, refinements, work preparation and aligning development with product and user needs within Agile Scrum teams.

UI/UX & Product Development
Broad experience with UI/UX, translating user and business requirements into practical interfaces and working closely with designers and stakeholders. Experience with Figma, prototyping, A/B testing and conversion optimisation.

Mobile & Cross-platform Development
Experience with Cordova and Telerik AppBuilder, complemented by React Native and Expo through continued professional development.

Experience

Professional experience10+ years
Freelancer since2022

Languages

GermanBasic knowledgeEnglishFluentDutchNative speaker

Project history

Freelance Programmer

Gifted Media
Gifted Media focuses on software development, consultancy and digital media. Supporting organisations both technically and strategically in developing and improving digital products. Technical expertise primarily focused on front-end development with React, TypeScript and JavaScript, complemented by broad experience with C#/.NET and PHP. Additional experience with Product Ownership, Scrum Master responsibilities and Agile product development. Also active in podcasting, videography and digital content production. Clients include DHL eCommerce and Stater.

Full Stack Developer C# (Freelance)

Stater
Stater is a Dutch financial services provider specialising in mortgage administration and mortgage processes. Worked within an Agile Scrum team on maintaining and further developing existing applications using C#/.NET and JavaScript. Key part of the assignment was implementing EAA and WCAG 2 accessibility guidelines and further development of the Design System. Also worked with Contentful and Azure Pipelines and was part of the incident management team. Technology: C#/.NET, JavaScript, Contentful, Design Systems, EAA/WCAG 2, Azure Pipelines, Git, Rider, Agile Scrum, Incident Management.

Front-end Developer (Freelance)

DHL eCommerce
DHL eCommerce is part of DHL Group and focuses on parcel delivery and e-commerce logistics. Worked on the courier application and the web application used by CityHubs. Developed with React, TypeScript and (S)CSS and worked extensively with the Material UI-based Design System. Developed new reusable components for the Design System. Worked with GraphQL and REST APIs and was involved in Storybook, Cypress, CI/CD and WCAG accessibility. Technology: React, TypeScript, SCSS, Material UI, Tailwind, GraphQL, REST/OpenAPI, Storybook, Cypress, Design Systems, WCAG, CI/CD, Azure DevOps, GitHub Actions, Agile Scrum.

Front-end Developer / Product Owner

Kaartje2go
Kaartje2go is a Dutch e-commerce company that enables consumers to design and send personalised cards and gifts. Primarily worked on the online editor, developing new features and reusable components using React and TypeScript. Worked with REST APIs, Jest, Puppeteer, Selenium, AWS and a Design System based on Atomic Design. Also fulfilled the role of Product Owner, responsible for backlog management, work preparation, refinements and aligning development with product needs. Technology: React, TypeScript, Emotion, SCSS, REST/OpenAPI, Jest, Puppeteer, Selenium, AWS, Design Systems, Atomic Design, CI/CD, Agile Scrum, Product Ownership.

Front-end Developer / Cordova Developer

HKV Lijn in Water
HKV is a consultancy firm specialising in water management and flood risk. Developed websites, dashboards and mobile applications for visualising and working with technical and geographical information. Worked with React, JavaScript, SCSS, Material UI, Backbone and Cordova, and contributed to the C# backend where needed. Technology: React, JavaScript, SCSS, Material UI, Cordova, C#, PostgreSQL, MySQL, Mobile Development, UI/UX, Git.

Webdeveloper & Apple Systems Administrator

OpenForest B.V.
OpenForest was an IT services provider specialising in IT management and Apple-based workplace environments, particularly within the healthcare sector. Started as a Web Developer developing and maintaining web applications using PHP, MySQL, JavaScript, HTML and CSS. Later combined development with a role as Technical Specialist within the Apple systems administration team. Technology: PHP, MySQL, JavaScript, HTML/CSS, Linux, Apache, Apple OS X Server, Git, Jira/Confluence.

Front-end Javascript Developer

Speakap B.V.
Speakap develops an internal communication platform that enables organisations to digitally connect their employees. Worked on the web application, focusing on asynchronously retrieving and presenting data from the backend. Worked with JavaScript, jQuery, Backbone.js, Handlebars, Require.js, HTML/CSS, PHP and MySQL. Technology: JavaScript, Backbone.js, Handlebars, Require.js, HTML/CSS, PHP, MySQL, Jira.

Front-end Developer & Consultant

G+J Media Services / Ligatus Nederland
Ligatus was an international online performance marketing network. Role combined front-end development, UI/UX and online marketing. Developed and optimised microsites and advertising components. Used A/B testing and analysed results to base decisions on user behaviour and performance. Worked closely with clients and sales teams on campaigns and reporting. Technology: JavaScript, HTML/CSS, PHP, UI/UX, A/B-testing, conversion optimisation, performance marketing, Jira/Confluence, Salesforce.

Webdeveloper

De Volgende Verdieping
De Volgende Verdieping was an e-learning company that developed digital learning solutions and serious games. Worked on interactive e-learning applications and serious games, primarily using Flash and ActionScript in combination with PHP, MySQL, JavaScript, HTML and CSS. Technology: JavaScript, jQuery, PHP, MySQL, ActionScript, HTML/CSS, Serious Games, E-learning.

Various Roles

Freeler BV
Freeler was one of the first free internet service providers in the Netherlands. Started in second-line technical support and progressed into various technical and organisational roles. Within Service Level Management, responsible for ensuring that incidents involving external suppliers were resolved within agreed SLAs. Also developed and maintained a knowledge base for customers and employees, and gained first experience with PHP, Linux and Apache.

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