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SaaS Product Development — Web & Mobile

A web app and a mobile companion on the same backend, with multi-tenancy, auth and billing built in from day one — engineered to be extended, not rebuilt at your first 100 customers.

Web app plus a mobile companion app on the same backend and data model
Multi-tenant architecture, authentication and Stripe billing built in from day one
Modern stack chosen for your team to maintain, not the trendiest one available
API-first build so integrations and a public API come later without a rewrite
Analytics and usage tracking wired in so you know what customers actually use
Ongoing engineering available post-launch — same team, no re-onboarding
Built to survive your first 100 customers, not just your demo

Built to be extended, not rebuilt

Most early SaaS products get rebuilt once, quietly, around 100 customers — because multi-tenancy was bolted on late, billing was hand-rolled instead of using Stripe properly, or the mobile app was scoped as an afterthought on an architecture that never planned for it. We build the harder parts correctly from the first commit, so growth does not force a rewrite.

What we build

  • Web app — your core product, built on a stack your future engineering hires can actually maintain.
  • Mobile companion — on the same backend and data model as the web app, not a separate codebase drifting out of sync.
  • Multi-tenancy, auth and billing — architected in from day one, because retrofitting tenant isolation into a live product with paying customers is one of the most expensive mistakes in SaaS.
  • API-first — so a public API, webhooks or new integrations later are additions, not rewrites.

From MVP to a product that scales

Start with an MVP scoped to your core flow, or go straight to Full Product if web and mobile both matter from day one. Either way, Ongoing Engineering keeps the same team building after launch — because a SaaS roadmap does not stop at v1, and re-onboarding a new team every time you need a feature is its own hidden cost.

Already have a roadmap from a Fractional Product Manager engagement? We build directly against it. Get a free SaaS architecture review — bring your idea or your existing product, and leave with a realistic build plan.

Frequently Asked Questions

We already have a fractional Product Manager or a roadmap — can you just build?
Yes — most SaaS builds go faster with a roadmap already prioritized, and we build directly against it rather than re-discovering scope from scratch. If you do not have one yet, our [Fractional Product Manager](/services/fractional-product-manager/) service exists for exactly that gap, and the two engagements are designed to hand off cleanly to each other.
Web app, or web plus mobile from day one?
Depends on where your customers actually are. If usage is clearly desktop-first (most B2B SaaS at launch), start web-only and add mobile once you have real usage data telling you it is worth it — that is what the MVP tier is for. If mobile is core to the product from day one (anything usage-in-the-field, notifications-driven, or consumer-facing), build both together on Full Product, because retrofitting a mobile app onto an architecture that never planned for it is expensive.
How do you handle multi-tenancy and billing?
Multi-tenancy is architected in from the start — tenant isolation at the data layer, not bolted on later, which is one of the most expensive things to retrofit in a SaaS product. Billing runs on Stripe: subscriptions, plan upgrades and downgrades, usage-based pricing where relevant, and webhooks wired correctly so a failed payment does not silently leave an account in the wrong state.
What stack do you build on?
Typically React or Next.js on the frontend, Node.js or Python on the backend, Postgres for the database, and React Native or Flutter for the mobile companion — chosen because they are stacks your future hires can actually find and maintain, not because they are the newest thing. If you already have technical opinions or an existing partial build, we work within them rather than imposing our own.
Can you take over an existing SaaS codebase?
Usually, yes, starting with a codebase and architecture audit before we quote ongoing work — multi-tenancy, data isolation and billing integration are exactly the areas where an existing SaaS codebase tends to have accumulated the most technical debt, so we look there first, not last.
What happens after the MVP ships?
Most clients move into Ongoing Engineering, because a SaaS product's real work starts at launch, not before it — feature requests from actual paying customers, performance issues that only show up under real load, and a roadmap that needs continuous prioritization. The same team stays on, so there is no ramp-up cost every time you need something built.
Get a free SaaS architecture review ← All services

Pricing plans

The best solutions for our customers

  • MVP

    From $12,000 one-time
    • Web app MVP — your core user flow, built properly
    • Authentication and Stripe subscription billing
    • Basic admin panel for support and account management
    • Single-tenant or light multi-tenant, scoped to your launch need
    • Analytics wired in from day one
    • Mobile companion app
    • Public API
    Order

  • Full Product

    From $30,000 one-time
    • Web app plus a mobile companion app, shared backend
    • Full multi-tenant architecture
    • Stripe billing with plans, upgrades and usage-based options
    • Integrations with the tools your customers already use
    • Analytics and usage tracking across web and mobile
    • Admin panel with role-based access
    Order

  • Ongoing Engineering

    From $6,000 per month
    • Dedicated squad continuing feature development post-launch
    • Same team that built it — no re-onboarding, no ramp-up
    • Bug fixes, performance work and dependency upkeep
    • New features scoped and shipped on a regular cadence
    • Scales up or down as your roadmap changes
    Order