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Web & Producto

Scalable SaaS Platforms, Marketplaces and Web Systems

Building web applications, marketplaces, SaaS platforms and scalable, AI-first digital systems.

Sprouting City

Scalable SaaS Platforms, Marketplaces and Web Systems in action

An empty digital plot.

We build your billable digital product.

Every click or tap plants a seed.
Desarrollo Web, Apps y SaaS Premium experience

Define your SaaS and see its dashboard

Fill out a short brief and see the metrics dashboard for your future SaaS.

InteractionFill out the brief
ResultYour project summary
MeasuresMRR and active users
Design my SaaS Interactive version in preparation — schedule a call and we'll walk through it for your case.

What this service solves

This service is aimed at turning business ideas into functional digital products. It includes web-first platforms, subscription systems, marketplaces, dashboards, user portals, admin modules, internal systems and monetizable digital products. The focus is building solid, scalable MVPs oriented toward commercial validation.

What's included

  • Defining the business model and user roles.
  • UX/UI design oriented toward conversion.
  • Cloud technical architecture (Next.js, Postgres, Supabase, Vercel).
  • The monetization flow (subscription, marketplace, transactional).
  • An admin and operational panel.
  • A phased roadmap.

How we work

We define the business model, users, roles, features, technical architecture, database, monetization flow, admin panel, roadmap and minimum launch criteria. The priority is launching with control, then measuring and scaling.

How we work: service methodology

  • Phase 1 · Functional Scope, Database Architecture and Wireframes (Weeks 1-2) — Defining user stories, relational table schemas, UI/UX design and the subscription checkout flow.
  • Phase 2 · Backend Core Development, Auth and Multi-Tenancy (Weeks 2-4) — Building the API, secure session management, user permissions and per-company data separation.
  • Phase 3 · Payment Gateway and Billing Integration (Weeks 4-5) — Configuring recurring charges, plan upgrades, automatic billing and cancellation handling.
  • Phase 4 · AI Module Integration and Core Features (Weeks 5-6) — Connecting LLM models, background async processing and user dashboards.
  • Phase 5 · Load Testing, QA, Cloud Deployment and Launch (Weeks 7-8) — Deploying to CDN-backed servers, security testing and official go-live.
  • On-demand marketplace variant (services 39/52) · Defining the two-sided model (customer/professional), mobile-first app-style UI/UX design, a geolocation dispatch engine, and a pilot in a limited geographic zone before official launch.

What we need from your team

  • A product vision document, business logic and end-user pricing models.
  • The graphic identity manual and logo for the SaaS/Marketplace.
  • Developer accounts with the chosen payment gateway and cloud provider.
  • For on-demand marketplaces: defining service categories, suggested prices and initial coverage zones.
  • For on-demand marketplaces: an account with a geolocation provider for smart dispatch.

Deliverables

  • A production platform.
  • A documented database and APIs.
  • An admin panel.
  • A technical and operational manual.
  • An evolution roadmap.

Who it's for

  • Founders with a validated idea who need a serious MVP.
  • Companies that want to digitize a recurring service.
  • Brands looking to build a marketplace or portal.
  • Businesses that need their own billable product.

Signs you need it

  • You have a validated business idea in conversations and spreadsheets, but no functional digital product backing it.
  • The service you sell manually today could work as a subscription, but you don't have the platform to charge for it that way.
  • You want to connect supply and demand in your own marketplace, but lack the technical development to launch it.
  • You've tried to move forward with generic tools or templates, and the result can't support the growth you need.

Benefits

  • A production MVP ready for real customers.
  • A scalable architecture with no rewrite needed.
  • A clear monetization model.
  • The ability to iterate with data.

Measurable KPIs

  • User activation.
  • Conversion to a paid plan.
  • Cohort retention.
  • Cost per critical feature.

Expected outcome

The team has a production, scalable and billable platform that operates as a digital asset of the business, with usage metrics, monetization and a growth roadmap.

Frequently asked questions about this service

What does building a SaaS platform or marketplace include?

The full product lifecycle: UI/UX design, multi-tenant database architecture, frontend, backend, payment gateways, secure authentication, role management, and native AI features.

How long does building an MVP take?

The project is structured in 5 phases over 7 to 8 weeks, from functional scope and wireframes to load testing and going live in production.

What do I need to provide as the client?

A product vision document, business logic, end-user pricing model, a graphic identity manual/logo, and developer accounts with the chosen payment gateway and cloud provider.

Is it possible to build an on-demand marketplace like a home-services app?

Yes. There's a specialized variant with real-time geolocation, smart dispatch and conversational WhatsApp scheduling.

What do I receive at the end of the project?

Complete source code in a private repository, the platform live in production with SSL and its own domain, and a superadmin panel with business metrics.

Technology stack

  • Next.js
  • TypeScript
  • Supabase
  • Postgres
  • Vercel
  • Stripe
  • Resend
  • OpenAI
Plans & pricing

Investment for this service

Essential

$2,500 USD

Accessible entry point: diagnostic, blueprint or initial setup.

  • Complete source code delivered in a private repository.
  • Diagnostic and project-scoping session.
  • No commitment.
Buy Essential

AI-First Enterprise

$18,000 USD

Advanced, documented and scalable solution.

  • Everything in the Professional plan, with expanded scope.
  • Complete source code delivered in a private repository.
  • An operational SaaS / Marketplace platform in production with SSL and its own domain.
  • A superadmin panel for managing business metrics.
  • On-demand variant: a geolocation dispatch algorithm and a conversational WhatsApp scheduling bot.
  • Extended support during implementation.
Request a proposal

Secure payment via Wompi (PSE, Nequi, cards, Bancolombia). Larger-scope plans are handled with a custom proposal.
Prices are jsadsAI professional fees and do not include licenses, hosting, domains, cloud infrastructure, API usage, third-party tools or ad spend, which the client covers separately.

Next step

Ready to turn this service into a real implementation?

Schedule a 30-minute conversation with jsadsAI | José Santamaría. You'll get a concrete scope proposal, USD-priced plans and an implementation plan adapted to your operation.

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