Subscription-Based Software

SaaS App Development ServicesBuild Scalable Software-as-a-Service

Launch your subscription-based SaaS platform with confidence. Our expert team builds multi-tenant, scalable, and secure SaaS applications with recurring revenue models, advanced analytics, and seamless integrations.

Start Your SaaSView SaaS Projects
25+SaaS Platforms Built
$5M+ARR Generated
99.9%Uptime SLA

Built your SaaS prototype with an AI tool and need it production-ready? See MVP Rescue →

⭐Why Choose Us

Why Build Your SaaS With Kosi Digital

Specialized SaaS development for recurring revenue success

🏢

Multi-Tenancy Architecture

Secure multi-tenant infrastructure where each customer's data is isolated. Scale efficiently while serving thousands of tenants.

💳

Subscription Management

Built-in billing, subscriptions, and payment processing. Stripe/PayPal integration with automated invoicing and revenue recognition.

📊

Analytics & Metrics

Track MRR, churn, LTV, and user engagement. Data-driven insights to optimize your SaaS business and drive growth.

⚡

Auto-Scaling Infrastructure

Cloud infrastructure that scales automatically with demand. Handle growth from 10 to 10,000 customers seamlessly.

🔐

Enterprise Security

SOC 2 compliance, data encryption, SSO, and audit logs. Enterprise-grade security that customers trust.

🔌

API & Integrations

RESTful APIs and webhooks for extensibility. Integrate with popular tools like Zapier, Slack, and third-party services.

🗺️Our Process

How We Build SaaS Applications

Proven methodology for launching successful SaaS products

1

SaaS Strategy & Planning

Define business model, pricing tiers, target customers, and feature roadmap. Design multi-tenant architecture and subscription logic.

Deliverables: Business model, pricing strategy, technical architecture, roadmap
2

Core Platform Development

Build multi-tenant infrastructure, authentication, subscription management, and core features. Set up billing and payment processing.

Deliverables: Working platform, tenant management, billing system
3

UI/UX & Onboarding

Design intuitive interface and smooth onboarding flow. Create beautiful dashboards and ensure excellent user experience.

Deliverables: User interface, onboarding flow, admin dashboard
4

Testing & Security Audit

Comprehensive testing including security audits, load testing, and subscription flow validation. Ensure compliance and reliability.

Deliverables: Security audit report, test results, compliance documentation
5

Launch & Growth

Deploy to production with monitoring and analytics. Support beta launch, gather feedback, and iterate for product-market fit.

Deliverables: Live SaaS platform, analytics setup, growth strategy
⚡Technology Stack

SaaS-Optimized Technologies

Modern tech stack designed specifically for SaaS applications

Frontend

⚛️React
⚡Next.js
🎨TypeScript
💅Tailwind CSS
📊Chart.js

Backend & APIs

🟢Node.js
🚂NestJS
⚙️GraphQL
🔷Express
🔌REST API

Database & Storage

🐘PostgreSQL
🍃MongoDB
⚡Redis
☁️AWS S3
📦Elasticsearch

SaaS Tools

💳Stripe
🔐Auth0
📊Mixpanel
📧SendGrid
🐳Docker
💼Portfolio

SaaS Success Stories

Successful SaaS platforms generating recurring revenue

📊

Analytics SaaS Platform

Real-time analytics platform serving 2,000+ businesses. $1.5M ARR with automated billing and multi-tier subscriptions.

ReactNode.jsStripe
🎯

CRM SaaS Solution

Customer relationship management SaaS with pipeline management, automations, and reporting. 5K+ active tenants.

Next.jsPostgreSQLAWS
💼

HR Management SaaS

Complete HR platform with payroll, time tracking, and employee management. Enterprise-ready with SOC 2 compliance.

AngularNestJSMulti-tenant
💰Pricing

SaaS Development Pricing

Investment in your recurring revenue business

SaaS MVP

Custom-scoped

Launch your SaaS

  • ✓ Core SaaS architecture
  • ✓ Subscription billing
  • ✓ User authentication
  • ✓ Basic analytics
  • ✓ 6-8 week delivery
  • ✓ 30 days support
Get Started
Most Popular

SaaS Professional

Custom-scoped

Production-ready SaaS

  • ✓ Everything in MVP
  • ✓ Advanced features
  • ✓ API & webhooks
  • ✓ Admin dashboard
  • ✓ Advanced analytics
  • ✓ 12-16 week delivery
  • ✓ 90 days support
Get Started

Enterprise SaaS

Custom

Enterprise-grade platform

  • ✓ Everything in Professional
  • ✓ White-label options
  • ✓ SSO & compliance
  • ✓ Custom integrations
  • ✓ Dedicated team
  • ✓ Priority support
  • ✓ SLA guarantee
Contact Sales
💬Testimonials

What Our Clients Say

Real feedback from teams we have worked with

⭐⭐⭐⭐⭐

"Kosi Digital Services has been incredible to work with. We highly recommend Kosi Digital Service and incredible developers. Developers are wonderful about communication, and fabulous at internalizing the need of the given task."

DE

Dara Epstein

CEO, Smart Sitting

⭐⭐⭐⭐⭐

"Deepak @ Kosi Digital is beyond incredible to work with. He is quick, communicative, adaptable, accountable, incredibly smart, kind, and not for nothing, but he also has a great sense of humor."

SZ

Suzie Zeldin

COO, Smart Sitting

⭐⭐⭐⭐⭐

"Kosi Digital delivered a seamless React interface for our Lega AI platform, integrating RAG-based responses and MSAL authentication flawlessly. Their understanding of AI systems and enterprise security made the entire integration smooth and production-ready."

M

Marina

EggOn Technology

❓FAQ

Frequently Asked Questions

Q: How much does it cost to build a SaaS application?
A: SaaS cost is shaped by multi-tenancy design, subscription billing complexity, API and webhook surface, admin tooling, and enterprise features like SSO and white-labeling. An MVP that validates the model is a much smaller scope than a production platform with enterprise onboarding. We provide a detailed fixed estimate after a free architect-led scoping call — no obligation.
Q: How long does it take to launch a SaaS product?
A: A SaaS MVP launches in 6-8 weeks; a full production platform typically takes 12-16 weeks including billing, onboarding, and a security audit. Multi-tenancy and billing are built in the first sprints because retrofitting either into a single-tenant codebase later is one of the most expensive mistakes in SaaS.
Q: What is multi-tenant architecture and do I need it?
A: Multi-tenancy lets many customers share one application instance while keeping their data strictly isolated — it is what makes SaaS margins work, since you run one codebase instead of one deployment per customer. If you plan to sell subscriptions to more than a handful of companies, you need it designed in from day one.
Q: Shared database, separate schemas, or database-per-tenant — which tenancy model is right?
A: A shared database with row-level tenant isolation suits most SaaS up to thousands of tenants — cheapest to run and simplest to migrate. Schema-per-tenant or database-per-tenant becomes worth the operational cost when enterprise customers demand hard data isolation or per-tenant compliance. We usually build shared-DB with a clean tenant abstraction so you can promote big accounts to dedicated infrastructure later without a rewrite.
Q: How do you implement subscription billing with Stripe?
A: We build on Stripe Billing: tiered plans, free trials, proration on upgrades, usage-based metering where needed, automated invoicing, and dunning flows for failed payments. Webhook handling is done properly — idempotent and reconciled — because silent webhook failures are the number one source of SaaS revenue leakage we see in rescue projects.
Q: What tech stack do you recommend for a SaaS platform?
A: React or Next.js with TypeScript on the frontend, NestJS on Node.js for the API, PostgreSQL with row-level security for tenant data, Redis for caching and queues, and AWS for infrastructure. It is a deliberately boring, proven stack — 15 years of Node.js and 5 years of NestJS experience behind it — that scales and that your future hires will already know.
Q: What happens first when we engage you to build our SaaS?
A: A SaaS strategy phase: we define pricing tiers, map features to plans, design the tenant and billing model, and produce the technical architecture. You get the business model mapped to an architecture document — reviewed by our principal architect — before any code, because tier limits and tenancy decisions shape the entire codebase.
Q: Can the platform scale from 10 customers to 10,000?
A: Yes — the architecture is designed for that curve: stateless services behind load balancers, auto-scaling on AWS or Azure, Redis caching, and a CDN, load-tested before launch. Our founder scaled LiveHindustan.com from crashing at 5M to 60M+ monthly users, and the same capacity-planning discipline is applied to every SaaS we ship.
Q: How do you handle security and SOC 2 readiness for enterprise SaaS buyers?
A: We build the controls enterprise procurement asks about: encryption at rest and in transit, role-based access, audit logs, SSO (SAML/OIDC), and tenant data isolation, aligned to SOC 2 criteria from the start. When you pursue certification, the architecture and evidence are already in place, and we support GDPR and HIPAA requirements where your market demands them.
Q: Who will build our SaaS product?
A: A dedicated team — solution architect, 2-3 fullstack engineers, and QA — headquartered in New Delhi, India, working remote-first as your product team. Every release passes architect review under our Guardian model, led by founder Deepak Jha, Technical Lead with 15+ years of experience across 25+ SaaS and platform builds.
Q: How does working together work across time zones?
A: We hold daily overlap with US EST/PST, UK GMT, EU CET, and UAE GST, with SaaS clients across the US, UK, Europe, Dubai, and Australia. You get sprint demos every two weeks, a shared roadmap board, and async updates every working day — the cadence of an in-house team without the in-house cost.
Q: Do we own the SaaS platform and its code outright?
A: Completely — 100% of the source code, infrastructure configuration, and IP belongs to your company, in your repositories and cloud accounts from the first commit. We sign an NDA before discussing your product, and there is no revenue share, license fee, or lock-in of any kind.
Q: What ongoing development does a SaaS product need after launch?
A: SaaS is never "done": launch tiers include 30-90 days of support, and most clients continue with a monthly engagement covering feature development, churn-driven UX fixes, billing edge cases, and infrastructure scaling. We track MRR-relevant metrics with you so the roadmap is driven by revenue data, not guesswork.
Q: Should I build my SaaS with an agency or hire an in-house team?
A: Pre-revenue and early-stage, an agency gets you to market months faster: an in-house team costs $300K+/year and 3-6 months of hiring before the first feature ships, versus a full senior team starting within a week. Most of our SaaS founders build and validate with us, then hire in-house around product-market fit — and inherit a documented, architect-reviewed codebase built for that handover.

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