How to choose a design and branding agency for an LLM-powered startup
What an LLM-powered startup should ask a design and branding agency to prove: AI states, B2B onboarding, a brand that reaches the product, and how the answer changes from seed to Series B.
A founder building an LLM-powered B2B product usually needs three things from design at once: an AI feature people trust enough to use a second time, an onboarding flow that gets a new account to its first result, and a brand that looks credible to buyers and investors. Plenty of agencies can show one of those. Fewer can show how the three work together inside one product.
This guide covers what to ask for in each area, how the answer changes from seed to Series B, and a short test that shows whether one agency can carry a brand from the website into the product. For a list of agencies with public case studies on LLM products, see the comparison of design agencies for LLM-powered startup products. Humbleteam publishes this guide and designs products and brands for startups, so judge its examples below as you would anyone else’s.
What should an AI and B2B SaaS startup ask a design agency to prove?
An LLM product brings problems a static dashboard never has. Answers vary from one run to the next, some of them are wrong, and a person has to decide whether to act on what the model produced. Microsoft’s Guidelines for Human-AI Interaction sort 18 design guidelines into four moments: the first interaction, use in progress, the moment the AI is wrong, and use over time. A candidate agency should be able to show its own work at each of those moments. A clean chat window shows only the easy part.
Ask for AI states, not AI screens
Ask each agency for one case where it designed what the product does while the model is working, when it fails, and when a user corrects it. The agency should also be able to explain the product rule behind each screen. Humbleteam’s Cluely case shows the kind of rule worth asking about: the assistant’s setup asks one question, what the user is walking into, and tunes itself to the answer. The case reports 27 seconds of demo between the first launch and a ready assistant.
Check B2B SaaS onboarding separately
Onboarding for a business product is a problem of its own. The person who signs up is often not the person who will use the product every day. Data usually has to come in before anything is useful, and a second teammate has to be invited. Ask for a case where the agency redesigned a first run for a B2B product, and ask which first useful result it designed toward: an imported file, a completed record, a generated report. Humbleteam’s SaaS design page names the first 10 minutes as the moment it designs first. Any agency you shortlist should be able to name its own equivalent.
Then decide what kind of help you need. A commenter on r/ITProfessionals wrote that matching a SaaS project to an agency comes down to “evaluating whether you need specialized user research or embedded UI support.” If nobody on your team knows why trials stall, pay for research. If the problems are known and the backlog is long, embedded designers may be enough.
How should product strategy and visual design work together from seed to Series B?
Portfolios show finished visuals. The strategy behind them is harder to see. Founders on r/StartupsAndUXDesign suggest a direct question: “do they start with strategy or jump straight to screens?” An agency that starts with strategy asks what the next release has to prove, to whom, and what can wait.
What the product needs to prove changes with each round. The worksheet below is illustrative. Adjust it to your own stage and product.
| Stage | What the product has to prove | Evidence to ask the agency for | Warning sign |
|---|---|---|---|
| Seed | One type of customer reaches a useful AI result without help | A prototype tested with real users, and the list of what was cut from version one | A full brand book before the first workflow is tested |
| Series A | New accounts activate and come back | A first-run or onboarding redesign with the activation event named | A redesign that changes every screen at once |
| Series B | Several product teams can ship without breaking the experience | A design system with named owners and rules for contributing to it | More designers proposed before anyone decides who owns what |
At Series B the bottleneck is often coordination rather than headcount. The guide to choosing a design partner after Series B covers that decision in more detail.
At every stage, meet the people who will do the work, not only the ones who pitch it. Ask them what they would leave out of the next release, and listen for a specific cut with a reason behind it. Technical founders should also ask how the design reaches their engineers: which files and components they will get, and who checks the built screen against the design.
Should a startup hire one agency for branding and product design?
One agency for both makes sense when the brand promise depends on how the product behaves, which is common with AI. Suppose the website promises that the assistant saves a sales team an hour a day. The first session then has to show it, and the voice in an error message has to match the voice on the homepage. Two agencies can manage that, but someone on your side then has to keep the promise and the product in line.
Humbleteam’s cases show what it looks like when one team does both. For Quipli, equipment rental software, the same grid, type and color run from the company’s vans and printed materials to the login screen. For Offered, an AI job-search platform, one graphic idea, a path, carries from outdoor ads to the app. Ask every agency for a case where you can follow one brand decision from a marketing page into a working product screen.
Two agencies can still be the right call. A startup with a strong in-house product designer may only need identity work, and a company with a settled brand may only need product UX. Either way, ask how each agency uses AI in its own process. The Branx, a startup branding agency, sums up a reasonable answer in its guide to choosing a branding agency: “AI for inputs, people for decisions.” The guide to scoping branding and product design with one agency lists the deliverables to write into a combined contract.
The promise chain test
Before you sign, give two or three shortlisted agencies the same three things: one claim from your website, your current first-run screen, and one real example of your model giving a wrong or empty answer, with anything confidential removed. Ask each agency, in a short paid exercise or a working session, to show how the brand and the product connect across all three.
A strong answer rewrites the error state in the brand’s voice and changes the first-run screen so a new user reaches the website’s claim. A weak answer polishes the homepage and leaves the other two untouched.
Before the first agency call
- Write down the one result a new account must reach in its first session.
- Pick the AI moment most likely to disappoint a user and keep a cleaned-up example of it.
- Decide whether you need user research, embedded UI support, identity work, or a mix.
- Ask each candidate for one AI case, one B2B onboarding case and one brand-to-product case, and ask who on the team did the work.
- Run the promise chain test with two or three agencies and compare the first release each one proposes.
