MVP Development Services · Vertical B2B SaaS

MVP development services for vertical B2B SaaS founders

From idea to deployed MVP in 60 days. Auth, billing, dashboards, AI integrations — production-ready, not demo-ware. Built so you can onboard your first paying customer the day you launch.

Why vertical B2B SaaS

Horizontal SaaS is saturated. Vertical is where the next wave lives.

Faster conversion

Niche tools that speak the customer's language convert faster than generic ones. Less education, less objection handling, more "yes" by month 2.

Lower churn

Vertical SaaS becomes load-bearing in your customer's workflow. Switching cost is real. Retention curves look healthier than horizontal alternatives.

Defensible moat

Domain expertise embedded in the product is hard to replicate. Big horizontal players move slowly into niches; you can own one before they notice.

What's included

Production-ready MVP, day 60

Auth and accounts

Email + OAuth login, multi-tenant org structure, role-based permissions. Supabase Auth, battle-tested.

Billing and subscriptions

Stripe integration with subscription tiers, trial periods, webhook handling, customer portal. Ready to take real money on day one.

Core product flows

The actual product — what your customer pays for. Built around your top 3-5 user stories, the ones that prove the value proposition.

Dashboards and analytics

Customer-facing dashboards for the data your product generates. Admin views for you to monitor adoption, identify churn risks.

AI integrations

When AI is part of your value prop: Claude, OpenAI, RAG, agents, embeddings. Wired in cleanly, with cost controls and prompt versioning.

Deployment + handoff

Production deployment on Vercel + Supabase, monitoring set up, full documentation, and onboarding session with your team.

Method

Four phases. Sixty days. One MVP.

  1. 1

    Operational scoping

    Days 1-10. One-page user story map, locked feature list (and cut list), data model sketch, tech stack decision. Build can start clean.

  2. 2

    Core product build

    Days 11-40. Auth, data model, business logic, the actual usable interface. No fancy design, no nice-to-haves — the value-prop workflow, reliable.

  3. 3

    Closed beta + iteration

    Days 41-55. Onboard 3-5 pilot users. Watch them use it. Fix what blocks adoption. Validate pricing with at least one paying customer.

  4. 4

    Launch + first revenue

    Days 56-60. MVP in production, pricing page live, first contract signed or in motion. Not a quiet soft launch — a real launch with commercial intent.

FAQ

MVP development questions

Another question? contact@flexinai.com

Can you really ship an MVP in 60 days?

Yes, when the scope is right. Our method is built around that constraint: we kill features that don't belong in v0, lock the spec early, and ship a focused MVP. Six months of discovery isn't part of the deal.

What's actually included in an MVP build?

Auth, billing (Stripe), core feature flows, dashboards, basic admin tools, deployment, and documented handoff. Everything needed to onboard early customers and collect signal — nothing more.

Who's this for?

Founders building vertical B2B SaaS, operators launching a side product, agencies wanting to productize a service. If you have a real problem and a real pilot customer in mind, we can help. If you're still searching for the problem, we'd suggest validating before building.

What's your tech stack for MVPs?

Next.js, Supabase (auth + database + storage), Stripe (billing), Vercel (hosting), and Claude or OpenAI APIs when AI is part of the product. This stack is fast to ship, scales to thousands of users, and stays cheap until you grow.

What about UX and design?

We use Tailwind + shadcn/ui for clean, functional interfaces. Premium custom design isn't part of the MVP scope — we focus on what gets validated first, then iterate on visuals once the product clicks.

Do you take equity instead of cash?

Generally no, but case by case. We're a services business, not a co-founder. If your project has unusual strategic value to us, we can discuss alternative structures.

How do we collaborate during the 60 days?

Weekly demos, async daily updates via Slack or Linear, and a fixed scope document we both sign at day 0. You'll see the MVP take shape in real time, with clear decision points if scope changes are needed.

What happens after launch?

Three options: take the codebase in-house and continue solo (we document everything), retain us monthly for iteration and bug fixes, or onboard a fractional CTO. We don't lock you into long-term contracts.

Next step

Got a vertical SaaS idea?

Free scoping call to evaluate your idea, validate the fit, and sketch what a 60-day build would actually look like. No commitment — we'll tell you if we're not the right team.

Book a free scoping call