Celina Koekenbier

Frontend Developer at Publicis Groupe / Digitas Pixelpark

Frontend Developer, UI/UX designer, Android & IOS App, graphic designer, marketing and social media manager for MagLes Match App. Delivered pixel-perfect, high-performance web solutions for major German clients, including DocMorris, Astara, and Nahkauf. Learned and implemented Thymeleaf, Rust, and Leptos to meet client needs in complex projects.

CEO / CMO / Designer at Slim Media S.L.

Graphic and web designer for a great variety of clients designing websites logos, flyers, packaging, magazines, etc.

Freelance Graphic & Web Designer at Insight design

Designed a complete website prototype in Adobe XD and developed it from scratch, resulting in a modern, fast, and user-friendly site. (Temporary contract for Maternity cover)

UI/UX Frontend Developer at Microgestió Premium Apple Reseller BCN

Modernized a legacy Flash/ActionScript product into a responsive, mobile-friendly application, greatly improving usability and accessibility. Created custom UIs and contributed to the Vue 3 next-generation platform, enhancing scalability, performance, and maintainability.

Frontend Developer at MEDIFY IBERIA SL

Frontend: JavaScript (ES6+), Vue.js, React, HTML5, CSS3, SCSS, Responsive Web Design, REST APIs; UI/UX: Design Systems, Prototyping (Figma, Adobe XD, Sketch), Web Accessibility (WCAG); Other Tech: Git, MongoDB, Express.js, Node.js, Agile, Scrum, Thymeleaf, Rust, Leptos. Certifications: Web Accessibility Certification, Scrum for Developers, Git Certification.

Frontend Developer at Medify Iberia

Designed and adapted user interfaces for a health care app, improving clarity and usability and supporting onboarding of a major new client. Modernized a legacy Flash/ActionScript app into a fully responsive web app, improving usability on mobile devices. Contributed to migration of the app to Vue 3, creating reusable UI components.

Frontend Developer at Publicis Groupe / Digitas Germany

Implemented user interfaces for large-scale web platforms using Vue.js, React, and modern JS practices. Focused on accessibility, performance, and responsive design across remote teams.

Front End Designer at Mikrogestió Apple Premium Reseller

Designed and built a new front-end for a reseller, delivering a mobile-friendly experience and aligning UI with brand guidelines. Improved conversion and usability during the contract period.

UI/UX Designer & Co-founder at Slim Media

Co-founded and designed UX for digital products; led UX design, app testing, social media and marketing campaigns; built reusable UI components in collaboration with external developers.

Visual Designer at Insight Design

Designed logos, visual assets, magazines and websites for various Dutch and Spanish clients; created digital marketing content and brand visuals; collaborated with clients to create cohesive visual identities.