How early-stage is too early for an agency engagement?

If you have a one-page concept and no validated demand signal, we will tell you to spend $0 on engineering and $2,000 on customer discovery first. The right time for us is when you have either real paying-customer interest, a soft commitment from a design partner, or a clear thesis backed by a few weeks of conversations. We have walked away from pre-validation engagements because it does not serve us OR the founder.

Do you take equity instead of cash?

No. We have considered it three times and declined three times. Equity-for-services creates misaligned incentives (we ship fast even when you should pivot) and undervalues both sides. Cash, fixed scope, clear acceptance criteria works better.

What's the typical SaaS MVP cost and timeline?

MVP for a single-tenant SaaS with auth, one core workflow, basic admin, and Stripe billing: $35,000 to $80,000 over 10 to 14 weeks. Multi-tenant with org switching, role-based access, and admin tooling: $70,000 to $140,000 over 14 to 20 weeks. Add an AI-integration layer (RAG, LLM-powered features): plus 4 to 8 weeks and $20,000 to $50,000.

Do you build with Next.js exclusively?

Next.js 16 is our default for the web layer. We have shipped on Remix and Astro when the project profile called for it. React Native for mobile. Postgres (Supabase, Neon, Vercel Postgres-style providers) for the database layer. Stripe Connect or Stripe Billing for the money layer. We are stack-pragmatic, not stack-religious.

Can you serve as our technical lead after the MVP ships?

We offer a post-launch retainer (typically 10 to 30 hours per week for 3 to 6 months) that covers bug fixes, small features, and a fractional-CTO advisory role for funding conversations or hiring your first internal engineer. After that we typically hand off cleanly to your internal team rather than camp on the codebase.

Do you help with go-to-market, pricing, or growth?

We have opinions but it is not our service. We will tell you we think your $99/month pricing is too low for the buyer profile, and we will tell you why. But we will not run your paid acquisition or write your launch copy. We refer to specialists we have worked with when those needs come up.

How do you handle the typical pre-seed budget constraint?

We scope honestly. We say no to features that cost more than the validation they will return. We will pair-program with you (or with your first engineering hire) when budget runs tight late in the engagement. We will recommend pausing for 3 months between MVP launch and v2 if the data does not yet support v2 - which we have done twice and both clients thanked us for it.

SaaS Startups

SaaS that gets you to product-market fit.

We are the technical partner pre-seed and seed-stage founders bring on to ship a real SaaS product. MVP through Series A. Multi-tenant from week one. Stripe billing wired correctly. AI integration where it makes sense.

Talk To Us See Works

SaaS startup software DesignKey builds - multi-tenant products with billing and analytics

12+

Production SaaS platforms shipped since 2020

Verticals: fintech, healthcare, EdTech, marketplace, services, B2B

10-14w

Typical MVP timeline, kickoff to live

Clients handed off cleanly to internal teams after v1

MostMostagencyagencySaaSSaaSbuildsbuildsfailfailbecausebecausethetheagencyagencyoptimizesoptimizesforforbillablebillablehourshourswhilewhilethethefounderfounderneedsneedsproduct-marketproduct-marketfit.fit.WeWescopescopeforforthethelatterlatter--sometimessometimesthatthatmeansmeanstellingtellingyouyoutotovalidatevalidatebeforebeforebuilding,building,andandhandinghandingoffoffcleanlycleanlyonceonceyouryourteamteamcancanownownit.it.

What we build

What we build for SaaS founders

Six surfaces every modern SaaS needs. We have shipped every one of these in production for paying customers.

//mvp.ship

MVP buildwk 11 / 14

Auth + onboarding

Stripe billing

Core workflow

Ship in 10-14 weeks.

The fastest path to a product that handles real traffic, real payments, real support tickets. One senior engineer, one designer, a part-time lead.

//tenant.scope

Acme Inc.Active

Globexswitch

Initechswitch

Org switching, scoped data.

Org switching, role-based access, tenant-scoped data, per-tenant billing. The most expensive thing to retrofit, so we make the call correctly at the start.

//stripe.billing

Pro plan

$49/mo

Subscriptions to payouts.

Subscription billing, usage-based pricing, marketplace payouts, trials, dunning. All shipped in production. Stripe is the default; we pick alternatives when the math demands.

//auth.session

Owner

Admin

Member

SSO, roles, invites.

Email + password, SSO via Clerk or Auth.js, magic links, social providers, team invites, role hierarchies. The auth decision affects everything; we get it right early.

//product.metrics

Instrumented from day one.

Event tracking with PostHog or Mixpanel, conversion funnels, retention dashboards. The data you do not capture in week one you will never get back.

//ai.layer

QueryLLMAnswer

When it earns its place.

OpenAI, Anthropic, Vercel AI Gateway, RAG with pgvector or Pinecone, agent workflows. Shipped in production SaaS multiple times. We will tell you when AI is the wrong answer.

Why DesignKey for SaaS startups

What we believe about building SaaS the right way

12+ SaaS shipped since 2020

Real users, real revenue.

Shipped12+ live

Fintech · 4

Healthcare · 2

EdTech · 2

We say no to bad scope

Validate before you build.

No demand signal

Vanity features

Fluid scope, fixed price

Senior-only delivery

No bait-and-switch.

A.K.

Senior

R.M.

Senior

J.T.

Senior

3+ SaaS shipped each

Fixed price when scope is real

No surprise change orders.

Statement of work

Scope locked

Acceptance criteria

Fixed pricelocked

Tampa rates, US-time-zone

30-40% below SaaS hubs.

DesignKey · Tampa

NYC

We hand off cleanly

We do not camp on your codebase.

UsYour team

3 clients handed off after v1

Case studies

Six SaaS platforms across six verticals

A representative slice of our SaaS work. Fintech, healthcare, EdTech, marketplace, marketing tech, construction. Different stakeholders, same underlying delivery patterns.

See More Cases

View

Trading

Go deeper

Related services and deeper guides

A SaaS build cuts across the whole stack. These pages dig into the parts that matter most.

SaaS Development

The parent service hub for everything we build. Tech stack, process, and pricing across all verticals.

Learn More

AI Integration

RAG, LLM-powered features, agent workflows. Where AI sits inside a modern SaaS product.

Learn More

Front-End Development

The product surface your users live in. Modern, responsive front-end built on Next.js and React.

Learn More

FAQ

SaaS startup development questions

What founders ask in discovery calls about working with us on a new SaaS build.

Ready to get started?

Shipping a SaaS in 2026? Let's talk.

No sales pitch. A working session on your demand signal, architecture shape, and MVP scope. We share what we have shipped and where we have walked away. You decide if we fit.

Schedule A Call

Email Us

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100% Satisfaction

Dedicated Team

Reply in 1 Business Day

More industries

Explore the other industries we build for

SaaS Startups is one of five verticals we treat as a pillar. Each earns its place with shipped case studies and a written point of view.

Fintech

4 platforms · since 2020

Healthcare

2 products live · Arizona

EdTech

2 platforms · LA + NYC

SaaS that gets you to product-market fit.

What we build for SaaS founders

Ship in 10-14 weeks.

Org switching, scoped data.

Subscriptions to payouts.

SSO, roles, invites.

Instrumented from day one.

When it earns its place.

What we believe about building SaaS the right way

12+ SaaS shipped since 2020

We say no to bad scope

Senior-only delivery

Fixed price when scope is real

Tampa rates, US-time-zone

We hand off cleanly

Six SaaS platforms across six verticals

Transforming the Trading Experience

Doctor Joyce’s Kids Weight Loss Program

E-learning Platform

Localizing the Freelance Service Platform

RevEngine Referral Platform

Data Management Platform

Related services and deeper guides

SaaS Development

AI Integration

Front-End Development

SaaS startup development questions

How early-stage is too early for an agency engagement?

Do you take equity instead of cash?

What's the typical SaaS MVP cost and timeline?

Do you build with Next.js exclusively?

Can you serve as our technical lead after the MVP ships?

Do you help with go-to-market, pricing, or growth?

How do you handle the typical pre-seed budget constraint?

Shipping a SaaS in 2026? Let's talk.

Explore the other industries we build for

Fintech

Healthcare

EdTech