Empowering forward-thinking startups with design that drives growth

We specialise in helping early-stage tech companies solve design challenges through clear and user-friendly websites, impactful branding, and seamless digital experiences in health, sustainability, and science—fostering lasting connections and business growth.

Design Challenges are holding you back

Every company faces complex design problems that can make it hard to stand out in competitive markets.

Whether it’s a confusing brand identity or an inconsistent user experience, these issues can slow your growth, hinder user engagement, and make scaling harder than it needs to be.

We understand these challenges and can help you break through them, simplifying the complex and allowing your brand to grow.

Our Role in solving it

We’re ready to partner with you...

At Mistaek, we specialise in helping early-stage tech startups solve design challenges through clear, thoughtful solutions.

By embracing mistakes as opportunities for innovation, we turn challenges into solutions that work for you.

Tailored Solutions

Each project is approached with fresh eyes, creating unique solutions for your brand. With a focus on accessibility and usability, we create designs that not only look good but also work flawlessly.

Collaboration first

We believe the best designs come from close collaboration with clients—together, we create meaningful experiences that drive growth.

Design and Strategy Expertise

Over the years, we’ve mastered modularity, blending creativity with strategy to provide user-centred designs.

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I've had the pleasure of collaborating with André for several years, and his creativity and assertiveness always stand out. His ability to combine innovative design thinking with practical solutions brings significant value to any project. His deep understanding of the user experience principles, combined with his strategic mindset, ensures impactful and user-centered solutions.

Beyond his technical skills, his reliability and trustworthiness make him a standout professional in the UX industry. His contributions continuously elevate the quality of the work, making him a valuable asset to any team or project.

I highly recommend André to anyone looking for an experienced and dedicated UX designer who truly makes a difference.

Testimonial photo

Beatriz Botão, Co-Founder & Strategy Lead at

Why choose us?

... And we grow with you

We don’t just deliver great designs; we built strong relationships. We bring together a network of talented professionals to ensure your project gets the attention it deserves.

Plus, we understand the value of forward-thinking design that can adapt and grow as your business does.

Design Systems & DesignOps

Scalable, efficient systems that ensure consistency across your brand.

UX/UI & Product design

User-centered designs that enhance usability and create seamless experiences.

Web Design

Crafting responsive, visually engaging websites that connect with users across all devices.

Branding

Building a cohesive brand identity that resonates with your audience.

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André Sequeira
01. André Sequeira, Founder

Meet the founder

I’m André, the creative force behind Mistaek, a design studio dedicated to helping tech-driven startups and companies build brands that stand out and inspire change.
Know more about me

A Clear step-by-step journey

Our approach ensures a smooth,

results-driven experience for every client

01

Introductory Call

We get to know each other and discuss your needs.

02

Discovery Call

In a one-hour detailed session, we’ll dive into the problem areas and explore how we can help.

03

Project Execution

Once we agree on a solution, we start designing and delivering a product you can be proud of.

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Our clients love the clarity, creativity and

results we bring to the table.

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+ and more

Explore how we can work together

We offer three levels of consultation to suit your unique needs

Basic

A discovery call to understand your needs and offer initial advice.

174 €

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  • One-hour consultation—we’ll talk and answer questions on the spot, trying to mitigate existing problems

Best Option

Standard

A deep dive into your design challenges with actionable insights.

475 €

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  • Everything in Basic

  • Design Snapshot Document

  • Follow-up call

Advanced

A comprehensive roadmap to guide you with your design needs.

966 €

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  • Everything in Standard

  • Action Blueprint document

  • Additional Follow-up call

Already have a project in the works?

Whether it’s a brand refresh, website redesign, or specific design tasks, we’ll collaborate closely to take your project to the next level.

Let’s refine your vision and make sure everything aligns with your brand’s goals.