Tim J.-Senior Frontend & UX Engineer
Check rate
Experience
Senior Frontend & UX Engineer
EnBW Energie Baden-Württemberg AG
Key responsibility for the visual and technical frontend relaunch as well as the continued development of the platform architecture.
- Designed and continuously developed the frontend architecture, including a Figma-based Component Library and migration to Vue 3.
- Developed a robust, high-performance, component-based CSS architecture.
- Continuously optimized accessibility, Core Web Vitals, and web performance.
- Worked closely with UX, Product, and Editorial teams on design, product, and implementation decisions.
RESULT:
- WCAG-compliant
- Core Web Vitals issues resolved
- PageSpeed ~90 Desktop / ~80 Mobile
Senior Frontend & UX Engineer
Yello Strom GmbH
Implemented several relaunches and modernized an established consumer platform into a component-based frontend.
- Modernized the legacy frontend from Knockout and jQuery to Vue 2.
- Developed a custom CSS framework and built reusable UI components.
- Continuously optimized web performance and Core Web Vitals.
- Worked closely with UX, Product, and other stakeholders on relaunches and the continued development of the platform.
RESULT:
- All relevant Core Web Vitals issues resolved
- PageSpeed 95+
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Energy and Utilities.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology and Product Development.
Summary
Senior Frontend & UX Engineer with over 20 years of experience modernizing large web platforms. Specialized in Vue 3, TypeScript, and component-based architectures. I combine UX, accessibility, and performance with pragmatic technical decisions—and use AI-powered tools where they measurably accelerate development.
Skills
- Vue 3
- Typescript
- Css/Sass
- Web Components
- Frontend Architecture
- Legacy Modernization
- Ux Engineering
- Accessibility / Wcag
- Web Performance
- Core Web Vitals
- Design Systems
- Css/Sass
- Ai-Accelerated Development
- Headless Cms / Contentful
Languages
Education
Rheinische Akademie Köln
ITA · Informationstechnischer Assistent
Statistics
Experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Tim is based in Cologne, Germany and can operate in on-site, hybrid, and remote work models.
Tim speaks the following languages: German (Native), English (Advanced).
Tim has at least 11 years of experience. During this time, Tim has worked in at least 1 role and for 2 different companies. The average length of individual experience is 5 years and 3 months. Note that Tim may not have shared all experience and actually has more experience.
Based on recent experience, Tim would be well-suited for roles such as: Senior Frontend & UX Engineer.
Tim's most recent position is Senior Frontend & UX Engineer at EnBW Energie Baden-Württemberg AG.
In recent years, Tim has worked for EnBW Energie Baden-Württemberg AG and Yello Strom GmbH.
Tim is most experienced in industries like Energy and Utilities.
Tim is most experienced in business areas like Information Technology and Product Development.
Tim has recently worked in industries like Energy and Utilities.
Tim has recently worked in business areas like Information Technology and Product Development.
Tim holds a Bachelor in Informationstechnischer Assistent from Rheinische Akademie Köln.
Tim is immediately available full-time for suitable projects.
Daily rate distribution
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Average rates for similar positions
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The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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