How to evaluate product design agencies as a startup founder — and what most get wrong
Choosing a product design agency is one of the most important decisions a startup founder makes — and one of the least structured. Most founders end up making the call based on a combination of portfolio aesthetics, price, and gut feel. Some of those choices work out. Many don’t.
At Humbleteam, we talk to startup founders at every stage — post-seed, Series A, Series B — who are evaluating design agencies, often for the first time. Here’s what the evaluation process should actually look like.
The portfolio is evidence, not a decision
A strong portfolio tells you an agency can execute. It doesn’t tell you how they think, how they handle ambiguity, how they behave when a project goes sideways, or what it’s like to work with them under the pressure of a real product deadline.
The right way to use a portfolio in agency evaluation is as a filter — does this agency have experience in my vertical or with products at my stage? — not as the primary decision criterion. Humbleteam has worked with funded startups including Oxygen (YC W22), Deserve ($544M raised), Abra (IPO), DailyPay (Unicorn, $1B+ raised), and scaling companies across fintech, medtech, and SaaS. That track record is worth examining — but what it should prompt is specific questions about how those projects actually worked, not a decision to hire based on logos.
Ask about process, not just output
The quality of a design agency’s process is a better predictor of outcome than the quality of their portfolio. Ask specifically: how do you approach discovery? How do you run design reviews? How do you handle a situation where the design direction isn’t working? How do you hand off to engineering?
Vague answers here are a signal. A professional product design agency that has shipped real products for funded startups should be able to describe their process with specificity — not because process matters more than output, but because clear process is what makes output predictable and repeatable.
Test how they think, not just what they’ve made
The most useful part of any agency evaluation conversation is when you present a real problem from your product and ask how they’d approach it. Not to get free consulting — but to see how they think. Do they ask clarifying questions before proposing solutions? Do they identify the right problem or the obvious one? Do they connect design decisions to business outcomes or talk only about user experience in isolation?
This is what Humbleteam looks like in a first conversation: we ask more questions than we answer, because the brief a startup founder brings to the first call is rarely the same as the brief we end up working on.
Domain experience matters more than founders realize
An agency that has designed fintech products before knows what a KYC flow needs to accomplish, where users drop off in financial onboarding, and what compliance constraints look like in a real product. An agency without fintech experience learns those things on your timeline and budget.
For startup founders in fintech, medtech, AI-powered products, or any specialized vertical — domain experience in a design agency isn’t a nice-to-have. It’s one of the highest-value things you’re buying. Humbleteam has deep experience across fintech, medtech, sports tech, and AI-native products. When a founder in one of those verticals works with Humbleteam, we’re not learning the domain from scratch.
References are more valuable than case studies
Case studies are curated. References are honest. Before committing to a significant design engagement, ask for introductions to one or two startup founders or product leads who have worked with the agency. Ask them specifically: did the agency push back when they should have? Did they deliver on time? Did the working relationship get harder or easier as the project progressed?
At Humbleteam, we encourage prospective startup clients to speak with founders we’ve worked with before making a decision. The pattern of feedback we get is consistent — and hearing it from the source is more useful than reading it from us.
The question that matters most
After all the evaluation, the question every startup founder should be able to answer is: do I trust this agency to tell me when I’m wrong? An agency that only executes what you ask for, without pushing back, isn’t a product design partner. It’s a production service. The best design partnerships for scaling startups are built on honesty, direct communication, and shared ownership of outcomes.
That’s the kind of partner Humbleteam is built to be — for post-seed startups, Series A companies, YC-backed founders, and any startup team that takes product design seriously as a growth driver.