We make complex innovation easier to understand.

Web Development Agency in Amsterdam

Marsmedia is a web development agency in Amsterdam that has been designing and building websites for twenty years — for biotech, life sciences, medtech, sustainable tech, SaaS and other organisations working on tomorrow’s world.

The build is never the starting point. First comes what the website has to say, and to whom. Then we choose the technology that serves it: WordPress for most, custom development where the project asks for it, AI-assisted development where it makes the work faster without making it worse.

Designed and built by the same team, from one studio. What you approve in the design is what goes live.

4.9 average on Google, 44+ reviews

Plan a call See our work
Web development agency Amsterdam — two Marsmedia team members reviewing a build
Web development agency Amsterdam — Marsmedia team at work
Web development agency Amsterdam — Marsmedia team at work
Web development agency Amsterdam — Marsmedia team at work
Web development agency Amsterdam — Marsmedia team at work
Web development agency Amsterdam — Marsmedia team at work
Mars team member presenting a marketing funnel diagram to colleagues
Close-up of a hand-drawn website wireframe sketch on paper
Group of friends toasting beer bottles on a rooftop terrace
Mars team reviewing brand color swatches and website mockups during a design meeting

Why development belongs next to design

Most website projects don’t fail in the design phase or the build phase. They fail in the handover between the two. We removed the handover.

4.9 average on Google, 44+ reviews

logo solventa
Avantium logo
logo pyxis
Avantium RDS logo
logo refuels
logo brachyacademy
logo brachytherapy
logo azerion
logo companyinfo
logo fsa
logo lms
logo scribe
Confo logo
logo abvion
Performation logo
logo jii
logo waste
logo billygrace
Cabometyx logo
logo stampa
logo redevco
logo vua
logo adgoji
logo e-storage

What we build, specifically

Custom web development

Some projects don’t fit a standard mould: a platform with complex data, a portal behind a login, integrations with systems that were never meant to talk to each other. That’s custom web development — built for what your organisation actually needs, not bent from a template.

Custom doesn’t mean starting from zero on everything. It means choosing precisely where custom work earns its cost, and where proven components do the job better.

Custom web development at Marsmedia — developer workspace in Amsterdam

WordPress and platforms

For most websites, WordPress is still the right choice: flexible, easy for your team to work with, and with room to grow. We’ve built on it for years and know where its strengths end — which is exactly when we advise something else.

Read more about how we approach WordPress development — from clean, lightweight builds to editorial setups your team will actually enjoy using.

WordPress development — web design being built on screen

Headless and integrations

For larger platforms we build headless: content in one place, delivered to website, app or portal from the same source. And we connect what needs connecting — HubSpot, Salesforce, Pipedrive, marketing automation, product data, single sign-on.

The rule stays the same: the architecture follows the project, not the other way around. Headless is a tool, not a badge.

Brand logo, color palette and typography integrated into a website design mockup

AI-assisted development

For smaller projects we increasingly use AI-assisted development: faster to ship, lighter on budget, with the same senior eyes on quality. The developer doesn’t disappear — the repetitive work does.

It’s also changing what’s feasible. Processes that used to live in impossible Excel sheets become tools: ROI calculators, configurators, internal calculation models. Work that once took hundreds of hours now fits inside a normal project budget. We’ll tell you honestly when that applies to yours — and when it doesn’t.

AI-assisted development at Marsmedia — developer at work in Amsterdam
Marsmedia studio in Amsterdam — development team at work
Overhead view of hands sorting Pantone color swatches for a brand identity

“Websites don’t fail in design or in build.
They fail in the handover. So we removed it.”

— Marsmedia

Nelson Eggermont, design and UX specialist at Mars

What working with us looks like

“In web design Amsterdam, I enjoy strategically shaping elements to draw visitors’ attention and instill trust in their brand’s professionalism. It’s fulfilling to help clients effectively communicate their products or services through visually appealing and user-friendly designs.”

Marsmedia

Nelson Eggermont, design and UX specialist at Mars
Smiling man with glasses, a friendly Mars team member

Every project here starts with a call. Yours can too.

How we work

Three steps. Everyone knows what is needed, and when.

Two overlapping speech bubbles icon symbolizing attentive listening to clients

We call first

Every enquiry starts with a phone call: is this a fit, can we genuinely add value? If not, we point you to someone better placed. If so, we plan a discovery session — the joint brainstorm where the real question surfaces.

Two overlapping speech bubbles icon symbolizing attentive listening to clients

We simplify

Most briefs want to say too much. We look for the single most important thing per page and keep the design calm — just enough to convince, with a clear next step. That’s the hardest part of the craft, and exactly where twenty years count.

Two overlapping speech bubbles icon symbolizing attentive listening to clients

We measure until it works

A website is never finished. Launch is the starting point: we measure behaviour and conversion, adjust based on the data, and your team keeps building in our block system — without coming back for every small change.

Frequently asked questions