Lead Product Designer

Clear Thinking,
Decisive Design

What I Do

I design products for scale-ups operating in complex domains spanning B2C, B2B, SaaS and 0-1, including fintech, e-commerce, visual programming, and automation. 15+ years of experience making sophisticated technology accessible to users.

Recent Impact

  • Designed programming platform powering 300M monthly automations (NodeScript)

  • Designed German pension automation serving 15+ enterprises (Bendesk)

  • Designed first recurring revenue infrastructure for German market (SumUp)

  • Designed loan flow that processed over £1 billion (Zopa)

I design products for scale-ups operating in complex domains spanning B2C, B2B, SaaS and 0-1, including fintech, e-commerce, visual programming, and automation. 15+ years of experience making sophisticated technology accessible to users.

Recent Impact

  • Designed programming platform powering 300M monthly automations (NodeScript)

  • Designed German pension automation serving 15+ enterprises (Bendesk)

  • Designed first recurring revenue infrastructure for German market (SumUp)

  • Designed loan flow that processed over £1 billion (Zopa)

Work

SumUp • 2020-2021

Tax compliance meets recurring revenue.

SumUp • 2020-2021

Tax compliance meets recurring revenue.

SumUp • 2020-2021

Tax compliance meets recurring revenue.

Fintech

Regulation

B2B

SumUp • 2020-2021

Tax compliance meets recurring revenue.

SumUp • 2020-2021

Tax compliance meets recurring revenue.

Fintech

Regulation

B2B

Bendesk • 2021-2022

Strategic frameworks, scalable systems, measurable impact

Bendesk • 2021-2022

Strategic frameworks, scalable systems, measurable impact

Bendesk • 2021-2022

Strategic frameworks, scalable systems, measurable impact

Strategy

B2B

Tag 3

Bendesk • 2021-2022

Strategic frameworks, scalable systems, measurable impact

Bendesk • 2021-2022

Strategic thinking, systematic building, tested.

Fintech

B2B

B2C

NodeScript • 2023-2025

Visual programming perfected as AI changed everything.

NodeScript • 2023-2025

Visual programming perfected as AI changed everything.

NodeScript • 2023-2025

Visual programming perfected as AI changed everything.

AI/Automation

B2B

B2C

NodeScript • 2023-2025

Visual programming perfected as AI changed everything.

NodeScript • 2023-2025

Visual programming disrupted by vibe coding

AI/Automation

B2B

B2C

UBIO • 2025

Three competing visions. One roadmap that shipped.

UBIO • 2025

Three competing visions. One roadmap that shipped.

UBIO • 2025

Three competing visions. One roadmap that shipped.

Strategy

AI

B2B

UBIO • 2025

Three competing visions. One roadmap that shipped.

UBIO • 2025

Three competing visions. One that shipped.

Strategy

AI

B2B

Approach

I help teams work through complexity by asking better questions, uncovering trade-offs, and creating clarity in the messy middle. Whether it's automation, regulatory compliance, or platform strategy, I balance systems thinking with the realities of people, product, and business.

How I Work: Four Integrated Perspectives

Strategic Thinking
I approach challenges like a business strategist first. Map the real problem. Identify leverage points. Think in systems and outcomes. Think in systems and outcomes. Like designing SumUp's first subscription product, enabling their shift to recurring revenue and becoming the foundation for 5+ future products.

Design Excellence
Design is how I make strategy tangible. Prototypes test business models. Interfaces validate assumptions. Visual frameworks align teams. 15+ years of craft deployed strategically.

Startup Speed
Work in sprints, not quarters. Ship to learn, not to impress. Validate early, pivot fast, focus on what works. No amount of polish fixes a product nobody wants.

AI Amplification
After 1000+ hours with AI tools, I use them as thinking partners. AI handles heavy lifting: data analysis, rapid prototyping, pattern recognition. I focus on judgment and human insight.

The result? Teams aligned around what matters. Decisions grounded in evidence. And products that ship because we solved real problems for real people.

Articles

Why we struggle with financial decisions, and how thoughtful design can help build better habits.

How physical space shapes our thinking, and why the future of digital design is beyond the screen.

How studying the past can reveal forgotten solutions and inspire innovation in modern design.

How architect Rem Koolhaas built a system to generate ideas, and what designers can learn.

Some Kind Words

We went through the entire process of exploring and defining the problem space, competitor research, creating prototypes, validating designs with users and seeing them go live. Strong sense of ownership, critical thinking and attention to detail.

— Steffen Jannsen, Senior Product Manager at SumUp

You were able to understand the business and the processes in no time and even managed to tame them and make the best of the given information/situation.
— Philipp Freese, CTO at Bendesk

"Deep knowledge of problem framing... expertly helped us create products that deal with a complex mixture of technology, legal, and user needs."

— Sharon Anne Kean, CPO at Zopa

"Rigorous & focused... I didn't manage to get a single shaky supposition past him in the entire year we worked together!"

— Adam Tarry, Product Owner at SpecSavers

Let's talk

Ready to discuss complex product challenges? Let's connect.

Book a Call

info@sjorstimmer.eu

Let's talk

Ready to discuss complex product challenges? Let's connect.

Book a Call

info@sjorstimmer.eu

Let's talk

Ready to discuss complex product challenges? Let's connect.

Book a Call

info@sjorstimmer.eu

Let's talk

Ready to discuss complex product challenges? Let's connect.

Book a Call

info@sjorstimmer.eu

Let's talk

Ready to discuss complex product challenges? Let's connect.

Book a Call

info@sjorstimmer.eu

Berlin, 2025

This is the end of the page, book a coffee call ☕, always happy to chat.

Berlin, 2025

This is the end of the page, book a coffee call ☕, always happy to chat.

Berlin, 2025

This is the end of the page, book a coffee call ☕, always happy to chat.

Berlin, 2025

This is the end of the page, book a coffee call ☕, always happy to chat.