Product Engineering · service 10 of 19

SaaS Platforms & Web Apps

Multi-tenant SaaS products and web applications — auth, billing, dashboards, APIs and AI features, built production-ready.

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Overview

Scalable, secure, user-centric applications.

I architect and build SaaS platforms end to end: data model, multi-tenant auth and roles, subscriptions, admin, integrations and the AI workflows that make the product valuable. Using spec-driven development with agentic coding, MVPs typically ship in 4–8 weeks without cutting production quality.

Frame from Kingshuk's "Build Micro SaaS Products" video
Frame · Build Micro SaaS Products

Problems solved

  • An idea that needs to become a real, paid product
  • MVPs that can't scale past the demo
  • Security, roles and billing done as afterthoughts
  • Teams without senior architecture leadership

What's included

  • SaaS architecture and multi-tenancy
  • Auth, roles and permissions
  • Subscriptions and payments
  • Admin and customer dashboards
  • AI features: RAG, agents, document AI
  • CI/CD, monitoring and cloud deployment

Deliverables

  • Product spec and architecture
  • Production web application
  • Admin panel
  • API documentation
  • Deployment pipeline and runbook

Workflow

How a saas & web apps project runs

Technologies

  • Next.js
  • React
  • FastAPI
  • Node.js
  • PostgreSQL
  • AWS
  • Docker

Use cases

  • Founder-led AI SaaS MVPs
  • Internal tools becoming products
  • Vertical SaaS (health, legal, facility, education)
  • Rebuilding a fragile legacy app
  1. 01

    Product spec

    Users, roles, data model, integrations and acceptance criteria in one versioned spec.

  2. 02

    Architecture

    Services, APIs, auth, storage and deployment plan sized for the next stage of growth.

  3. 03

    Agentic build sprints

    Task-by-task delivery against the spec with review, tests and demos each sprint.

  4. 04

    Harden & deploy

    Security, performance, CI/CD and observability before production traffic.

  5. 05

    Launch & scale

    Release, monitor, and iterate on real usage.

Related work

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