From messy product idea to dev-ready prototype in 2 weeks.
I'm Peter Marc. I help AI, fintech, and mobile startups turn rough ideas and half-built MVPs into clear product experiences your team can test, pitch, and actually ship.
15+ years shipping real product · Klarna · Rakbank · Guesty · Amazon/Kepler · Wolt
Startups don't need more design theatre. They need product clarity.
Most early products aren't held back by missing pixels. They're held back by unclear thinking that everyone can feel but no one has time to fix.
Your MVP is hard to explain
The idea is strong, but it takes three paragraphs and a diagram before anyone gets it.
Your demo needs too much narration
The product can't carry the story on its own, so every pitch leans on a founder talking over it.
Engineering is moving faster than design
Devs are shipping while the product direction is still being figured out in real time.
AI features feel powerful but unclear
There's real capability under the hood, but the experience doesn't make it obvious or trustworthy.
The product looks less mature than the company
The team and ambition are serious. The interface quietly undersells both.
You need senior judgment, not a full-time hire
You want someone who's seen this before, without committing to a headcount you can't justify yet.
Founder speed. Senior design judgment.
I'm not an agency and not a generic freelancer. I'm one senior product designer who can sit in the messy middle with you — from a rough idea, not only a polished brief.
I've shipped products where unclear UX costs real money: fintech onboarding, mobile commerce, platform merges. I use AI tools to compress product cycles, not to replace thinking.
This isn't a typical client-service relationship. I share feedback honestly, align with founders and product teams, and care about outcomes as much as the work itself.
I can move from strategy to prototype to handoff without dropping the thread. I know when you need a system and when you just need to ship.
Fifteen years of shipping real product.
I've worked on products where unclear UX costs real money and trust: fintech, mobile, logistics, and complex B2B, across startups, scaleups, and enterprise teams.
I also build my own products.
Daygrain is my current product experiment: a personal energy and decision-making app built around daily logging, Apple Health signals, and better self-awareness.
It's not a product I'm pitching here. It's proof of a builder mindset, and a reminder that I sit on the same side of the table as the founders I work with.
When it makes sense to work together.
If the problem and approach above feel familiar, here is how engagements usually start. No package pressure — we figure out the right entry point from your actual product context.
Product Acceleration Sprint
For a feature, flow, or product idea stuck between concept and build. Two weeks to turn messy thinking into something clickable your team can test, pitch with, or hand to engineering.
What you get
- Product framing and direction
- UX flows for the core journey
- Interaction and interface design
- Clickable prototype
- Handoff notes for engineering
- A clear summary of what to build next
AI UX Readiness Review
A focused read on one core flow before a bigger commitment. Useful when you want direction without jumping straight into a sprint.
- One core flow reviewed in depth
- Top 5 UX and product issues
- Now / next / later priorities
- A short Loom walkthrough or PDF
Fractional Product Design Partner
Senior product design on tap when the work does not fit a single sprint. Direction, sparring, and hands-on support as the product evolves.
- Product and design direction
- Async reviews and feedback
- Design system guidance
- Founder and product sparring
- Prototype and handoff support
Not sure which fits? Send me your product, MVP, or deck and I'll tell you where I'd start. No pitch.
Send me your productWriting about AI-native product design, design systems, and startup execution.
Short, opinionated notes on building product with less theatre and more clarity.
Have a product flow that feels harder to explain than it should?
Send me your product, MVP, deck, or prototype. I'll tell you where I'd start.