Home — Marion Séminel

Care for every design detail.
Optimise every line of code.
Turn every visit into an opportunity.

Marion Séminel

Marion Séminel

Design Engineer | 6 years of experience

Design Engineer building beautiful, fast, data-heavy interfaces

I design and develop web solutions that are fast, accessible and business-driven. From strategy to development, every decision is made to accomplish a goal: improve user experience, generate leads,....

Skills

  • Design systems
  • Data-heavy dashboards
  • Interaction design
  • Animation
  • Accessibility
  • Performance
  • Multilingual websites

Selected projects

Three of the products I’ve led the front-end on, from a Swiss ERP to a festival programme.

  1. 01CID ERP

    CID ERP software interface: general ledger view

    Giving a long-running Swiss ERP a modern interface, without rewriting its engine.

    • Lead dev
    • Product development
    • Design system

  2. 02Red Cross Museum

    Page for the permanent exhibition “The Humanitarian Adventure” on the Museum website

    A website designed to extend the Museum’s commitment and amplify its reach to a worldwide audience.

    • Lead dev
    • Next.js
    • WordPress headless

  3. 03Montreux Jazz Festival

    Montreux Jazz Festival programme: concert grid by day and by stage

    Redesigning the festival programme: the heart of the site, which has to excite as much as it informs.

    • Lead frontend
    • Programme
    • WordPress

  4. +4 more projects

    See all work

What I bring to a team

I’m a front-end developer with a designer’s eye, currently lead developer at a Lausanne agency and looking for my next full-time role in Zurich. I work where design decisions meet engineering constraints, from the first prototype to production code that stays fast and maintainable.

Front-end engineering

I build interfaces that scale with the product and the team behind it.

  • React & Next.js
  • TypeScript
  • Front-end architecture
  • Design systems
  • Data-heavy web apps
  • Code reviews & standards

Interaction & design

I work with designers from the first concept to the final details.

  • Interaction design
  • Animation (GSAP, CSS)
  • Prototyping
  • User experience
  • Figma to code

Quality & performance

I care about the details people feel without noticing.

  • Core Web Vitals
  • Accessibility (WCAG)
  • SEO foundations
  • Analytics & A/B testing
  • AI-assisted development

How I work in a team

No bad surprises, no vague promises. I rely on a proven, transparent and collaborative method to bring ambitions to life.

01

Strategy

  • Defining challenges and goals
  • Audit of the existing website
  • Competitor benchmark
  • SEO strategy

02

Design

  • Art direction
  • Wireframes
  • High-fidelity mockups

03

Development

  • CMS setup
  • Deployment
  • WCAG AA accessibility compliance
  • Performance

04

Reporting

  • Analytics setup
  • Analytics dashboards
  • Detailed reports
  • Strategy adjustments
  • Website optimisation

Why work with me?

6+ years of experience

I’ve built web apps and websites in many fields: fintech, healthcare, ERP. Data-heavy dashboards or brand websites for museums and festivals.

PRODUCT MINDSET

An interface isn’t done when it looks good. It’s done when people use it and the numbers move. I like working with clear metrics and seeing the impact of what I build.

Design meets code

I can shape a feature in Figma, build it in TypeScript and own it all the way to production, without losing anything between the two.

TEAM PLAY

I work best close to designers, backend engineers and product people. I set front-end standards, share them, and care about building things together over the long term.