10 Best Product Design Agenciesfor Series C Startups (2026)

Best product design agencies for series C startups

By Series C the company already has designers, a system and opinions. An agency gets bought for one of three reasons: capacity that cannot be hired fast enough, a new product line the core team cannot be pulled off, or an outside read the organisation can no longer produce about itself. Whichever it is, the work happens inside somebody else's design system, somebody else's sprint cadence and somebody else's vendor security review, and the person who signed the contract is a design or product leader whose judgement is on the line, not a founder spending their own money.

Ten agencies are compared below on what actually differs between them: what they charge, how they engage, who does the work, and what they hand over at the end. Every agency here carries a verified Clutch profile, and the ratings below are taken from it. Each entry says what an agency is worth hiring for and where it is the wrong choice for product design at Series C.

How the ten agencies compare

Agency	Best for	Starting price	Clutch rating	Not a fit for
Bricx	New product surfaces at Series C	$25,000+	5.0/5, 27 reviews	Open-ended headcount, companies past Series C
Monterail	Platform, API and integration work	$10,000+	4.8/5, 61 reviews	Outside design direction
Viget	Evolving a flagship product surface	$25,000+	4.8/5, 7 reviews	Rate-sensitive scopes, software depth
ustwo studio	Consumer-grade craft inside enterprises	$50,000+	4.5/5, 2 reviews	Thin public record, B2B depth
Akendi	Ongoing new product development	$5,000+	4.8/5, 4 reviews	Parallel workstreams at scale
Boldare	Working inside existing engineering	$25,000+	4.8/5, 63 reviews	Outside product direction
Boldheart	Standing up a second product	$50,000+	5.0/5, 12 reviews	Careful work on mature products
Dev Technosys	Blockchain product lines	$10,000+	4.8/5, 204 reviews	Design direction at scale
Devima Solutions	Internal operational tooling	$10,000+	5.0/5, 40 reviews	Enterprise scale, existing systems
Devlight	A first serious mobile product	$10,000+	4.9/5, 20 reviews	Standalone design engagements

Best product design agency for Series C startups: Bricx

Bricx is the best Series C teams that need a second product line or a hard problem taken off the roadmap without pulling the in-house team off the core product. Bricx has completed 50+ SaaS design projects across 30+ industries, with clients including Writesonic (YC S21), Collectwise (YC F24), Gigacatalyst (YC X26), Sybill, Camb.ai, LTV.ai, Instadapp, Hobbes and AT Kearney. The agency holds 27 verified reviews on Clutch at an average of 5.0/5.

Bricx works exclusively with B2B and AI SaaS companies, from seed stage through Series C, covering branding, website design, product UX/UI and end-to-end development. Engagements start at $25,000. Bricx works up to Series C and takes bounded programmes, a new product surface, a rebrand, a systems rebuild, rather than open-ended capacity. AT Kearney and Instadapp sit on that record alongside earlier-stage SaaS, and engagements start at $25,000.

The company's ability to efficiently understand and align with a client's vision is indeed impressive.

Starting price

$25,000+

Engagement model

Fixed-scope projects and monthly retainers

Timeline

First delivery within the first week; full scope varies by project

Clutch

5.0/5, 27 reviews

Hourly rate

$50 - $99

Best for

Series C teams buying a new product surface, a rebrand or a systems rebuild as a bounded programme.

Not a fit for

open-ended headcount cover, companies past Series C, or budgets under $25,000.

Monterail

Monterail's client base is already where a Series C company has arrived, half midmarket and 30% enterprise, with 61 Clutch reviews behind it since 2010. Its published work is platform-shaped rather than screen-shaped: backend systems, APIs and integrations for an AI property management platform, and an automated internal tool for a law firm wired into existing processes.

Design does not appear as a named service line at all, and its industries are medical at 25%, financial services at 20% and retail at 20%. For a Series C team that already has design leadership and needs execution, that works. For an outside opinion on the product, it is the wrong purchase.

Starting price

$10,000+

Engagement model

Project and retainer

Clutch

4.8/5, 61 reviews

Hourly rate

$25 - $49

Team size

50 - 249 people

Best for

extending a platform into integrations and internal tooling.

Not a fit for

an outside read on product direction, or budgets under $25,000.

Viget

Viget has been doing this since 1999 and 40% of its clients are enterprises, which is the profile of a firm that has been through vendor onboarding many times. One review describes evolving the UX of a client's flagship personality questionnaire, redesigning long repetitive questions and testing them, which is Series C work: improving something central that already carries the business.

Another review delivered prototypes and design systems in Figma plus a blueprint, so handback is evidently part of the practice. At $200 to $300 an hour it is the most expensive option here, and seven Clutch reviews is thin, with non-profit at 15% its largest industry rather than software.

Starting price

$25,000+

Engagement model

Project and retainer

Clutch

4.8/5, 7 reviews

Hourly rate

$200 - $300

Team size

50 - 249 people

Best for

improving a central product surface with research and a documented system.

Not a fit for

rate-sensitive scopes needing deep software specialism, or budgets under $25,000.

ustwo studio

One of ustwo studio's own reviews names the Series C failure mode out loud: the client said the team gelled well with theirs but could have kept more external perspective and offered differentiated insight. Half its clients are enterprises, and product design at 30% leads its mix, so it is used to working inside organisations that already have their own designers.

Two Clutch reviews at 4.5 is the thinnest and lowest-rated public record on this page, which is a poor evidence base for a $50,000 minimum. Its industries are consumer, medical and retail at 20% each, so B2B software conventions are not what the record demonstrates.

Starting price

$50,000+

Engagement model

Project and retainer

Clutch

4.5/5, 2 reviews

Hourly rate

$150 - $199

Team size

50 - 249 people

Best for

consumer-grade product craft for a large organisation.

Not a fit for

B2B software conventions backed by a deep public record, or budgets under $25,000.

Akendi

Akendi's fintech review describes the relationship a Series C company usually wants: four or five projects with the same client, focused on new product development rather than one delivery. Its other reviews describe field studies in real user environments, which is the outside read an organisation stops being able to produce about itself. It has worked from Toronto since 2007.

Only 30% of its output is UX/UI, with the rest across strategy, graphic and print design, so a company buying sustained product design is buying a minority of the practice. Four Clutch reviews is a thin public record, and at 10 to 49 people it cannot staff several parallel workstreams for a scaled organisation.

Starting price

$5,000+

Engagement model

Project and retainer

Clutch

4.8/5, 4 reviews

Hourly rate

$100 - $149

Team size

10 - 49 people

Best for

a standing research and design partner for new product lines.

Not a fit for

several parallel workstreams at scale, or budgets under $25,000.

Boldare

Boldare carries 63 Clutch reviews, the deepest public record on this page, and has run since 2004. One review is DevOps and IT infrastructure support for a SaaS company, implementing and monitoring what was already in place, which is a different competence from design: it shows a team that can operate inside an existing engineering organisation without being handed a clean slate.

UX/UI is 20% of a mix led by custom software development at 30%, and another review describes staff augmentation, supplying developers and designers into a client's team. That is capacity, not direction. A Series C looking for an outside view of its product will not get one from a team it manages.

Starting price

$25,000+

Engagement model

Project and retainer

Clutch

4.8/5, 63 reviews

Hourly rate

$50 - $99

Team size

50 - 249 people

Best for

extending an engineering organisation that already has its own plumbing.

Not a fit for

an independent read on product direction, or budgets under $25,000.

Boldheart

Boldheart built and scaled a software ecosystem of four interconnected web and mobile apps for a food service company, which is the closest published match on this page to the Series C problem of standing a second product beside the first without the two behaving like strangers. It calls itself a venture builder and works with corporates as well as startups.

Founded in 2020, it is the youngest firm here, and consumer products at 35% is its largest industry. Its other published work is MVPs, which is early-stage shape. At a $50,000 floor and $150 to $199 an hour, the price assumes a new build rather than careful work on an existing one.

Starting price

$50,000+

Engagement model

Project and retainer

Clutch

5.0/5, 12 reviews

Hourly rate

$150 - $199

Team size

10 - 49 people

Best for

launching a new product line that has to interoperate with the first.

Not a fit for

detailed work on a mature product, or budgets under $25,000.

Dev Technosys

Dev Technosys is 55% blockchain, the only firm on this page with that concentration, and carries 204 Clutch reviews, more than any other name here by a wide margin. For a Series C company whose next product line is on-chain, that is a specific capability rather than a general one, and its record includes an MVP for an AI and crypto travel platform with the APIs integrated.

No design line appears in its service mix, and its published work is manufacturer websites, an e-commerce build and MVPs, none of it at Series C scale. Small businesses and midmarket make up 80% of its book, and education at 15% leads its industries. This is production volume at $25 to $49 an hour.

Starting price

$10,000+

Engagement model

Project and retainer

Clutch

4.8/5, 204 reviews

Hourly rate

$25 - $49

Team size

50 - 249 people

Best for

an on-chain product line built cheaply and quickly.

Not a fit for

design leadership on a scaled product, or budgets under $25,000.

Devima Solutions

Devima Solutions built a PIM and an OMS for a hardware marketplace, systems for managing products, orders and shipments, which is the category of internal operational tooling a Series C company accumulates and nobody in-house volunteers to design. UX/UI is 30% of its mix behind web development at 40%, at $25 to $49 an hour, with 40 Clutch reviews at a perfect score.

Eighty percent of its clients are small businesses and none are enterprises, so nothing in its record is at the organisational scale of a Series C company. There is no evidence of working inside an existing design system, and its industries run to education and medical at 15% each rather than software.

Starting price

$10,000+

Engagement model

Project and retainer

Clutch

5.0/5, 40 reviews

Hourly rate

$25 - $49

Team size

10 - 49 people

Best for

unglamorous internal tools like catalogue and order management.

Not a fit for

work inside a mature design system at enterprise scale, or budgets under $25,000.

Devlight

Devlight is 60% mobile app development with 60% of its clients enterprises, the highest enterprise share on this page and an unusual pairing with a $25 to $49 rate. A Series C company that grew up on the web and now needs a real mobile product is buying a specialism it does not have, and one review describes a UI/UX audit of a financial app tied to conversion problems.

Design is not a named service line, appearing only inside development engagements, and its industries split evenly at 20% each across financial services, medical, retail and supply chain, with no software concentration. Twenty Clutch reviews is a moderate record for a 50 to 249 person team.

Starting price

$10,000+

Engagement model

Project and retainer

Clutch

4.9/5, 20 reviews

Hourly rate

$25 - $49

Team size

50 - 249 people

Best for

adding a mobile product to a company that grew up on the web.

Not a fit for

standalone design work without a build, or budgets under $25,000.

How much does a Series C product design engagement cost?

Project pricing. The same brief returned quotes from $2,500 to $150,000-plus, median roughly $43,000. Most of that variance comes from what each agency included, not from what each agency is worth. Those figures cover product design across the whole benchmark, so treat them as the range product design at Series C is quoted inside rather than a price for it.

Rate range. $25 at the floor, $195 at the ceiling, $55 to $90 in the middle. Where an agency sits is mostly where it is based, not how good it is. Series C engagements price higher than the same scope at Series A, because the agency absorbs vendor review, an existing design system, and a review cycle that includes people who did not choose them.

Most agencies offer one of three structures, splitting 45% Time & Material, 35% fixed price and 20% retainer across the 57 benchmarked. For product design at Series C the model usually matters more than the headline figure, because it decides what happens when the scope moves.

• Fixed price for bounded scope.
• Time & Material for evolving scope.
• Retainer for permanent design demand.
• Which one fits product design at Series C comes down to whether the scope is settled before the work starts.

How do you evaluate a product design agency for a Series C company?

Five things separate product design at Series C from earlier-stage work.

Ask how they work inside an existing design system. The interesting answer is what they do when the system has no component for the thing being designed, because inventing one quietly is how drift starts.

Ask who they expect to report to. The sponsor is a design or product leader with a team of their own, and an agency that treats in-house designers as reviewers rather than collaborators gets resented into irrelevance.

Ask what their security review looks like. Procurement, an MSA and data handling questions arrive before any design does, and a studio that has never been through one adds weeks nobody planned for.

Ask whether they subcontract. A vendor questionnaire at this size asks who touches the data, and the answer has to match the names on the contract.

Ask how they hand back. The in-house team owns everything the day the engagement ends, so documentation, rationale and file hygiene are as much the deliverable as the screens.

What are the red flags when hiring a design agency?

• Discovery priced as a separate product. Paying twice to be told what you already know is common and avoidable.
• A team that grows only after signature. Ask who is assigned now, not who could be.
• Metrics quoted without baselines. "Increased conversion 40%" from what, over what period.
• No process for disagreement. Ask what happens when you reject a direction twice.
• Silence on what they would not take on. An agency with no boundaries has no specialism.
• No comparable example of product design at Series C. An agency that cannot point to work of the same shape is learning on your budget.

Should you hire a product design agency or build in-house?

An agency buys you time. Senior capability starts within weeks rather than after a hiring cycle, and the cost stops when the project does. For product design at Series C specifically, the question worth settling first is how often the work recurs.

A hire buys you depth. Someone inside the product makes better small decisions every day, but you are paying for the search, the ramp and the salary long before that shows up in the work. Where product design at Series C falls on that line is usually clear once you count how many times it will need doing again.

A Series C company can hire the designers it needs, and generally should for anything permanent. The reason to retain instead is time: a senior product designer takes three to six months to hire and another quarter to become useful, which is a full product cycle. The failure mode of retaining is a second design culture growing beside the first, with two systems, two vocabularies and an argument at every review.

FAQs

What makes product design at Series C hard?

The constraints are organisational rather than creative. There is already a design system, a design team with views, a roadmap committed months ahead and a procurement process, and the work has to survive all four before anyone judges it.

What does product design cost at Series C?

Fixed-price product design across the benchmark ran $2,500 to over $150,000 with a median near $43,000, and retainers ran $7,000 to $20,000 per month, which is how most engagements at this stage get structured. Bricx starts at $25,000.

Why hire an agency when there is already a design team?

For work that would otherwise stop the roadmap: a new product line, a systems rebuild, or an outside read on a product everybody inside has stopped seeing clearly. Capacity is the reason given, timing is usually the real one.

How long does vendor onboarding take?

Security review, an MSA and data handling questions often take longer than the first design sprint. Ask early who the agency subcontracts to, because a name appearing in the questionnaire but not the contract restarts the process.