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Product Design Consultant

Every great product starts with

The right diagnosis.
The right strategy.
The right question.
The right specialist
Brutal clarity.
The right diagnosis.
With 17 years across advertising, UX, and product strategy, I combine CPO thinking with senior design execution.

A custom-built AI infrastructure gives me the depth of a team and the speed to match. From diagnosis to delivery, one practitioner accountable for the outcome.
Dan Rutter - CEO at Digital Surge
Nick Roskam - CTO at SAV.com
Shay Brazier - Director and founder at Revolve Energy
Asa Cox - Ceo At Arcanum AI
Trusted by industry leaders
Brands we worked with
Case studies

Work that speaks for itself

THE CLARITY METHOD

How complexity becomes clarity.

Five phases: Diagnose, Align, Design, Build, Compound. Every engagement follows this thread, whether it's a two-week audit or a multi-year partnership.

The Method

The five-phase process for every engagement.

A structured sequence for finding the real problem, aligning on what matters, and designing and building the solution, without losing anything in translation. The format flexes. The method doesn't.

The Engine

The AI infrastructure that powers every phase.

A custom-built multi-agent AI system designed for consulting work. It's why one practitioner can go deeper in research, iterate further in design, and carry context from one engagement into the next.

The Audit

Two weeks to find where your product is losing growth.

Two weeks to diagnose where your product is losing growth and deliver a prioritised roadmap. The natural place to start — and the entry point into the full method.
Services

From strategy to implementation

Product Strategy
"Align your product Align your product with what drives growth." Connect design decisions to business outcomes, roadmap prioritisation, positioning, what to build first and whywith what drives growth.
UX Research
"Understand the real problem before solving it." Interviews, journey mapping, competitive analysis. The goal isn't more data, it's the right diagnosis.
UX/UI Design
Make complex products obvious to use. The core of everything I do. Interface design, interaction patterns, information architecture, turning complexity into experiences users understand immediately. Obvious is harder than clever.
Design Systems
"Consistent, scalable, built to last." Component libraries, design tokens, governance. Not a UI kit, the operating system for how your product scales.
Build & Ship
"From concept to working product, no handoff." I stay involved through shipping. The gap between design intent and live product is where most value gets lost.
Monitor and scale
"Measure impact, iterate, and grow over time." Post-launch analytics, iterative improvements. Design isn't done when it ships, it's done when it compounds.
About me

The strategic depth of a CPO, the craft of a senior practitioner

Founders come to me when something isn't working and nobody can name it. I find it. Then I design and build the fix — strategy to shipped, no handoff. 17 years across advertising, UX, and product design means the diagnosis is rarely wrong
About me
Strategic depth
Business fluency, product thinking, 17 years in the room where decisions get made.
AI-enhanced execution
The Clarity Engine gives me the depth and speed of a team, with senior-level judgment on every decision.
Adrien Castelain - Product Design Consultant working with clients during a workshop
Project phase
Discovery audit
Cursor icon showing a hand pointer
Strategy
Implementation
Deployment
Monitoring
Testimonials

In their words.

Get in touch
Adrien Castelain, product design consultant, presenting strategy to a client team
Adrien has provided a collaborative approach to design which has revolutionised our customer experience. The final product speaks for itself.
Dan Rutter
Co-Founder, Digital Surge
Dan Rutter — CEO at Digital Surge
Adrien has proven to be an exceptional UX/UI consultant. His attention to detail and innovative designs have significantly improved our user experience.
Nick Roskam — CTO at SAV.com
Nick Roskam
CTO at SAV

Ready to start?

Book a Clarity Demo, two weeks to diagnose where your product is losing growth.