MVP Development · 4 to 8 Week Builds

An MVP that proves the idea, not a finished product

We ship MVPs in 4 to 8 weeks with lean architecture, just enough features for the first 50 to 100 real users, and product analytics wired in from day one. Tech debt is accepted but documented, so you know exactly what to harden after you find product market fit.

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RG INSYS builds MVPs the way experienced founders wish their first agency had. We narrow scope ruthlessly, ship a usable build inside three weeks, and instrument the product so you can answer the only question that matters: are users coming back. AI native engineering keeps the price honest.

What we deliver: A working web or mobile MVP, hosted on your cloud, instrumented with analytics and session replay, documented for a takeover by any competent engineering team.
Typical timeline: 4 to 8 weeks end to end. One week scoping sprint plus 3 to 7 weeks of build.
Pricing from: $12,000 fixed price for a 6 week MVP.
Stack: Next.js or React + Node.js, PostgreSQL, Stripe, Auth.js or Clerk, PostHog, Tailwind, deployed on Vercel/Fly/AWS.
Compliance-ready for: GDPR by default. HIPAA, SOC 2, PCI DSS available on request with adjusted architecture.

What's included

Everything you need, end to end

🎯

Ruthless scoping

The first week we kill features. You arrive with a 30 story backlog; we leave with the 8 stories that prove or disprove the hypothesis. Everything else gets a Phase 2 sticker, not a "yes, but later".

🏗️

Lean architecture

One Postgres database. One Next.js app. One Stripe account. We do not introduce microservices, queues, or Kafka for a product that does not have users yet. Monolith now, split later when traffic justifies it.

🤖

AI accelerated build

Claude Code and Cursor scaffold the CRUD, the auth, the email flows, and the unit tests. Senior engineers handle business logic, security, payments, and the integration glue that AI gets wrong.

📊

Instrumented for PMF

PostHog or Mixpanel events, session replay, conversion funnels, and a small set of business KPIs are wired on day one. You ship to users and immediately see what they do, not what they say they do.

📒

Honest tech debt log

Every shortcut we take, hardcoded value, missing test, single instance database, lands in a written tech debt log with the risk and the fix cost. No nasty surprises six months later.

🤝

30 day stabilisation

After launch we run a 30 day stabilisation window. P1 bugs fixed within 4 hours. Daily availability on Slack. Included in the fixed price; no clock starts ticking the moment you go live.

Our method

How an MVP actually unfolds

Scoping sprint

One week. We turn your idea into a numbered backlog, a clickable Figma flow, an architecture diagram, and a written fixed price quote.

Build in fortnights

Two engineers, two week sprints, a demo at the end of every sprint on your real data. The first usable build is in your hands by week three.

Launch with metrics

Launch on your domain with analytics, error monitoring, and uptime alerts wired up. We help you write the launch email and onboard the first 20 users by hand.

Decide what is next

After 30 days you have real data. We help you read it and decide: harden, expand, pivot, or shut down. Whichever it is, you own the codebase and the analytics.

Our tech stack for MVP development

We pick a single boring stack on purpose. Boring stacks have better documentation, more hireable engineers, and fewer surprises in week six. AI tools work best on well trodden frameworks; that is another argument for boring.

Next.js / React Node.js / TypeScript PostgreSQL Prisma / Drizzle Auth.js / Clerk Stripe (payments) PostHog (analytics) Resend / Postmark Tailwind + shadcn/ui Vercel / Fly / AWS Sentry (errors) OpenAI / Anthropic APIs

Proof

A representative case study

PropTech · SaaS MVP UK real estate CRM, two founder team

A real estate CRM MVP shipped in 6 weeks, first paying customer within 9 weeks of starting

Two ex agents wanted to prove a niche real estate CRM idea before raising a seed round. RG INSYS scoped the smallest possible product, three core flows for lead capture, property matching, and viewing scheduling, and shipped a fixed price MVP in six weeks using Next.js, PostgreSQL, and Stripe. Within three weeks of launch they had paying users and the analytics to justify a pre seed cheque.

6 wksMVP delivery

$12kFixed price build

3 coreUser flows shipped

9 wksFirst paying customer

Read full case study →

Pricing

Transparent pricing

From $12,000 fixed price

6 week MVP with two engineers, lean scope, analytics, and 30 day stabilisation.

Scoping sprint: $1,500 (credited to project)
4 week minimum MVP: from $9,000
6 week standard MVP: from $12,000
8 week complex MVP: from $18,000

Full pricing & engagement models →

Transparent. No hidden fees. Free 48-hour estimate.

FAQ

Common questions

How fast can you ship an MVP?

Four to eight weeks for most MVPs, depending on integrations and authentication complexity. We start with a one week scoping sprint, then ship every fortnight until launch. The first usable build is usually in the client's hands within three weeks.

Will the MVP scale to thousands of users later?

It will get you to several thousand users safely. Beyond that, expect a deliberate hardening phase: introduce queues, split services, add caching, add proper observability. We document all known scale limits and tech debt explicitly so the next phase is planned, not surprise.

Do you handle design as well as engineering?

Yes. Most MVPs come with a small design pass using Figma plus v0.dev for the component scaffolding. We do not deliver pixel perfect bespoke design at MVP stage on purpose, your goal is to learn from users, not win awards.

What does "instrumented for PMF" mean?

We wire up product analytics (PostHog or Mixpanel), session replay (PostHog or LogRocket), and a small set of business event metrics, activation, retention, magic moment, on day one. You see what users actually do, not what you hoped they would do.

Do you accept fixed price MVP engagements?

Yes. After the one week scoping sprint we write a fixed price quote against a locked scope. Changes go through a written change request with cost and timeline impact stated up front. From $12,000 for a 6 week MVP.

Who owns the code and accounts?

You do, from day one. AWS, Stripe, domain, analytics, GitHub, all sit in your organisation under your billing. We are committed engineers, not landlords.

What happens after the MVP launches?

You can move to a monthly retainer for ongoing iteration, hire dedicated engineers, or hand the codebase to an in house team. We document everything clearly enough that any competent engineer can take over within a week.

Can you integrate with our existing tools?

Yes. Stripe, HubSpot, Intercom, Slack, Notion, Linear, SendGrid, Twilio, OpenAI, Anthropic, and most major SaaS APIs are routine. Niche or undocumented APIs add a few days to the schedule, we will tell you up front.