Sierra Hillman

hello, I'm Sierra

I design what happens after hello: the first tap, the next step, the reason you come back. Four years across startups and agencies taught me the same habits in both: work fast, ideate and prototype in quick rounds, keep stakeholders close, and build what I design with AI-assisted code.

I collaborate well and I am just as good alone. That is the duality of agency and startup work: trust me to deliver on my own, or with a team.

Nearly a decade of caregiving taught me to notice what a system misses long before I ever opened a design tool. That instinct is still the center of how I work: I start with the person and the problem, and let them shape the design.

Sierra Hillman

hello, I'm Sierra

I design what happens after hello: the first tap, the next step, the reason you come back. Four years across startups and agencies taught me the same habits in both: work fast, ideate and prototype in quick rounds, keep stakeholders close, and build what I design with AI-assisted code.

I collaborate well and I am just as good alone. That is the duality of agency and startup work: trust me to deliver on my own, or with a team.

Nearly a decade of caregiving taught me to notice what a system misses long before I ever opened a design tool. That instinct is still the center of how I work: I start with the person and the problem, and let them shape the design.

Writing

Thought pieces.

Three pieces, published with IDEO, on designing for caregivers and the people they care for.

Workshops, speaking and mentoring

Beyond the product.

I run workshops for clients and stakeholders, speak about design and care, and mentor designers at the start of their careers.

  • Sierra at a clear lectern on a stage, microphone in hand, her name and Keynote Speaker, IDEO projected behind her.
    Keynote

    RepEd Gala keynote

    IDEO honored as partner of the year2025

  • Sierra standing before a slide that defines human-centered design, speaking to a room of people at round tables.
    Workshop

    Human-Centered Design Biotech Workshop

    Solano County2025

Want a workshop, a talk or a mentor for your team?

Bring me in

Skills

What I bring.

Design
Interaction designUX/UI designInformation architectureHuman-AI interactionPrototypingUsability testingAccessibilityService designWorkshop facilitationDesign strategyStakeholder managementUser researchDesign systems
AI tools and practices
LLMs (GPT, Claude)MidjourneyElevenLabsVeoAI-assisted development (Lovable, Cursor, Figma Make, Claude Code)
Design tools
FigmaFramerAdobe Creative SuiteNotionFigJam
Methodologies
Human-centered designSystems thinkingDesign thinkingService blueprintParticipatory research

Experience

Where I've worked.

Consulting and early-stage startups. At IDEO I bring clients and stakeholders to a decision in weeks. At a startup I own the product end to end with engineers, with no one to hand it to.

Building something and need a designer who ships?

Let's talk
The assistant's orb turning at the centre while six things it does light up around it and connect back, each with a short line it says.
The new form, step by step: the Restaurant tile, the day chips with Tuesday on, the venue and listing cards, Send to RAMW, and Got it. Thank you. Each piece lifts out beside the phone as it happens.
The AI advocate listening: a soft blue orb breathing on a dark phone screen, with the word Listening beneath it.
The Coralum Health landing page on a phone. Its headline reads: Parkinson's care that keeps up with you.
The welcome screen of the first-dose guide on a phone: a family playing catch in the garden above the headline Let's get you ready, and the choice to walk through it first.
The Hella Pressed film: an orange, carrots and a beet fall onto a white set, a steel press comes down on them, and the juice pours into a bottle.
Every idea, the same size: sticky notes landing on a shared wall.
01 / 07

Interaction design for agentic AI

Consumer technology × IDEO2025NDA