About us

At DAY21, our mission is clear: we help businesses grow by designing digital experiences that are purposeful, innovative, and user-led. By combining the art of strategic design with the science of customer journeys, we empower our clients to seamlessly align their business strategy with their customer-centric ambitions—driving tangible results and meaningful connections.

Our Philosophy & Values

Curiosity fuels our craft. We see deep understanding—not mere data—as the key to unlocking significant progress. Around our table, you’ll find specialists in research, strategy, and design—each one obsessed with craft, clarity, and the pursuit of better.
  • We’re True Partners

    From day one, we embed ourselves in your mission and your team. Co-creation is our compass—because lasting solutions should feel as much yours as ours. Let’s make change stick, side by side.

  • Outside-In Thinking

    Routine can obscure relevance. We challenge assumptions, ask fresh questions, and open doors to new perspectives—always viewing your organization through the eyes of the people that matter most: your users. Transformation starts where your story meets theirs.


  • Real Transformation, Real Impact



    We walk the talk. Beyond strategy decks, we help shift mindsets and make impact tangible, durable, and lasting—across every level. We design for action, ensuring change isn’t just conceived, but lived.

David Zimmerman

Partner, Strategy

dz@day21.dk

+45 5194 6637

David Zimmerman

Partner, Strategy

dz@day21.dk

+45 5194 6637

David Zimmerman

Partner, Strategy

dz@day21.dk

+45 5194 6637

David Zimmerman

Partner, Strategy

dz@day21.dk

+45 5194 6637

Kasper Greve

Partner, Strategy

kg@day21.dk

+45 2120 2886

Kasper Greve

Partner, Strategy

kg@day21.dk

+45 2120 2886

Kasper Greve

Partner, Strategy

kg@day21.dk

+45 2120 2886

Kasper Greve

Partner, Strategy

kg@day21.dk

+45 2120 2886

Simon Vinther Nielsen

Partner & designer

svn@day21.dk

+45 3164 0110

Simon Vinther Nielsen

Partner & designer

svn@day21.dk

+45 3164 0110

Simon Vinther Nielsen

Partner, Design

svn@day21.dk

+45 3164 0110

Simon Vinther Nielsen

Partner & designer

svn@day21.dk

+45 3164 0110

Katrine Ly

Partner, Service design

kl@day21.dk

+45 5335 0964

Katrine Ly

Partner, Service design

kl@day21.dk

+45 5335 0964

Katrine Ly

Partner, Service design

kl@day21.dk

+45 5335 0964

Katrine Ly

Partner, Service design

kl@day21.dk

+45 5335 0964

Rasmus Berrig

Lead Service Designer & Strategist

rb@day21.dk

+45 2614 5038

Rasmus Berrig

Lead Service Designer & Strategist

rb@day21.dk

+45 2614 5038

Rasmus Berrig

Lead, CX & Strategy

rb@day21.dk

+45 2614 5038

Rasmus Berrig

Lead Service Designer & Strategist

rb@day21.dk

+45 2614 5038

Christian Tranberg Holm

Senior UX & Designer

cth@day21.dk

+45 2374 4719

Christian Tranberg Holm

Senior UX & Designer

cth@day21.dk

+45 2374 4719

Christian Tranberg Holm

Senior UX & Design

cth@day21.dk

+45 2374 4719

Christian Tranberg Holm

Senior UX & Designer

cth@day21.dk

+45 2374 4719

Blagoy Nikolaev

UI Designer

bn@day21.dk

+45 5029 3170

Blagoy Nikolaev

UI Designer

bn@day21.dk

+45 5029 3170

Blagoy Nikolaev

UI Designer

bn@day21.dk

+45 5029 3170

Blagoy Nikolaev

UI Designer

bn@day21.dk

+45 5029 3170

Josefine Povlsen

Service Designer

jp@day21.dk

+45 5050 5050

Josefine Povlsen

Service Designer

jp@day21.dk

+45 5050 5050

Josefine Povlsen

Assistant Service Designer

jp@day21.dk

+45 5050 5050

Josefine Povlsen

Service Designer

jp@day21.dk

+45 5050 5050

Our Approach

Clarity is a gift and a responsibility—especially in complex environments. Our approach transforms uncertainty into shared vision, and vision into action. Each journey is unique, so our process is open, collaborative, and intentionally tailored, so we can move quickly toward what matters most.
  • Visual Evidence & Vision Design

    Ideas only live if you can see and shape them. We translate strategy into clear, visual formats—prototypes and models that align expectations and spark dialogue. Before a single line of code is written, we invite your organization into the design process, building understanding, alignment, and confidence.

  • Execution-Driven Strategy

    Strategy is nothing without momentum. Ours is built on deep insight—and a restless eagerness to test, learn, and adapt. We view strategy as an engine for change: continuous, curious, and intent on measurable progress. We help you stay grounded while the world evolves around us.

  • Critical & User-Centered Thinking

    At the heart of our work are real humans and the real problems they face. We get there through cross-disciplinary teamwork, iterative testing, and honest conversations with users. By understanding needs beneath the surface, we refine solutions until they not only solve problems—but invite new possibilities.

Curious where your journey could take you? We are too. Let’s explore, create, and transform—one step, one touchpoint, one day at a time.

David Zimmerman

Partner & Strategist

Journey-led clarity

We use customer journeys to uncover insights, prioritise action, and design connected experiences.

Speed with direction

We help organisations move faster by creating clarity and momentum in complex settings.

Design-driven experience

Using design, we craft impactful experiences that align teams, engage users, and bring ideas to life.

Real transformation

We go beyond strategy decks. We work as part of your team and help implement change — and we know what it takes.

Looking for an agency?

Take a tour to get key information and ideas for how to move forword with finding the right agency.

Journey-led clarity

We use customer journeys to uncover insights, prioritise action, and design connected experiences.

Speed with direction

We help organisations move faster by creating clarity and momentum in complex settings.

Design-driven experience

Using design, we craft impactful experiences that align teams, engage users, and bring ideas to life.

Real transformation

We go beyond strategy decks. We work as part of your team and help implement change — and we know what it takes.

Journey-led clarity

We use customer journeys to uncover insights, prioritise action, and design connected experiences.

Speed with direction

We help organisations move faster by creating clarity and momentum in complex settings.

Design-driven experience

Using design, we craft impactful experiences that align teams, engage users, and bring ideas to life.

Real transformation

We go beyond strategy decks. We work as part of your team and help implement change — and we know what it takes.

Journey-led clarity

We use customer journeys to uncover insights, prioritise action, and design connected experiences.

Speed with direction

We help organisations move faster by creating clarity and momentum in complex settings.

Design-driven experience

Using design, we craft impactful experiences that align teams, engage users, and bring ideas to life.

Real transformation

We go beyond strategy decks. We work as part of your team and help implement change — and we know what it takes.

Journey-led clarity

We use customer journeys to uncover insights, prioritise action, and design connected experiences.

Speed with direction

We help organisations move faster by creating clarity and momentum in complex settings.

Design-driven experience

Using design, we craft impactful experiences that align teams, engage users, and bring ideas to life.

Real transformation

We go beyond strategy decks. We work as part of your team and help implement change — and we know what it takes.