Most SaaS tech stack advice falls into one of two traps: either it's a generic "use React and Node" article that ignores SaaS-specific requirements, or it's an over-engineered architecture diagram with Kubernetes, event sourcing, and microservices that no early-stage product needs.
The reality is simpler. A SaaS product has specific technical requirements — multi-tenancy, subscription billing, team management, onboarding, and usage tracking — and your stack should be chosen because it handles those requirements well. Not because it's trendy. Not because Netflix uses it.
This guide gives you the exact stack we use for SaaS projects at LSD Dev Studio, with explanations of why each choice specifically fits SaaS products.
The Recommended SaaS Stack
| Layer | Recommendation | Why It Fits SaaS |
|---|---|---|
| Framework | Next.js 16 | Server Components, API Routes, ISR for marketing pages — full-stack in one repo |
| Language | TypeScript | Shared types between frontend/backend/billing, catches bugs at compile time |
| Styling | Tailwind CSS + shadcn/ui | Ship fast, consistent UI, accessible components out of the box |
| Database | PostgreSQL (Supabase or Neon) | Multi-tenancy via RLS, ACID transactions, scales to millions of rows |
| ORM | Prisma or Drizzle | Type-safe queries, migration management, introspection |
| Auth | Clerk or Auth.js | MFA, team invites, RBAC, SSO for enterprise customers |
| Billing | Stripe Billing | Subscriptions, trials, metered billing, customer portal, invoicing |
| Resend | Transactional emails, React email templates, simple API | |
| Background jobs | Inngest or Trigger.dev | Billing webhooks, onboarding sequences, usage aggregation |
| Hosting | Vercel + Supabase | Zero-config deploys, serverless scaling, generous free tiers |
| Monitoring | Sentry + PostHog | Error tracking + product analytics in one setup |
| Feature flags | PostHog or LaunchDarkly | Roll out features per plan tier, A/B test pricing |
This stack handles everything from a pre-revenue MVP to a product doing $10M ARR. You don't need to change it until you hit genuine scaling problems — and most SaaS products never do.
Why Next.js Is the Default SaaS Framework
Next.js isn't just a frontend framework. For SaaS, it's a full-stack platform that handles three distinct surfaces from one codebase:
1. The Application (Server Components)
Your SaaS dashboard — where users spend 90% of their time — is built with React Server Components. Database queries happen on the server. Sensitive logic stays server-side. The browser gets rendered HTML, not raw data.
This matters for SaaS because:
- Faster initial load. Server-rendered dashboards load in one round trip, not three (HTML → JS → API → data).
- Simpler data fetching. No client-side state management library needed for most data. Just
asynccomponents that query the database directly. - Security. API keys, database credentials, and billing logic never reach the browser.
2. The Marketing Site (Static + ISR)
Your homepage, pricing page, blog, and docs are static pages that don't need a database on every request. Next.js generates these at build time (SSG) or on-demand with Incremental Static Regeneration (ISR). The result: a 100/100 Lighthouse score for your public pages while your dashboard handles dynamic, authenticated data.
Most SaaS products run two separate codebases for marketing and app. With Next.js, it's one codebase, one deploy, one domain. The / route is your marketing site. The /dashboard route is your app. No CORS, no subdomain configuration, no separate hosting.
3. The API (API Routes + Server Actions)
Stripe webhooks, third-party integrations, mobile API endpoints — all handled by Next.js API Routes in the same repo. Server Actions handle form submissions and mutations without writing separate API endpoints.
For a SaaS MVP, this eliminates the need for a separate backend service entirely. One repo, one deploy, one team. Read more about why we build with Next.js →
When to consider alternatives
| Alternative | When It Fits |
|---|---|
| Remix | If you prefer nested routing and loaders over Server Components |
| SvelteKit | If your team knows Svelte and you value smaller bundle sizes |
| Rails / Laravel | If your team is Ruby/PHP-native and you value convention over configuration |
| Go / Rust backend | Only if you have specific performance requirements that Node.js can't meet |
For 90% of SaaS products in 2026, Next.js is the right call. The ecosystem is the largest, the talent pool is the deepest, and the framework handles all three surfaces (app, marketing, API) without seams.
Database: PostgreSQL
PostgreSQL is the default SaaS database. Not because it's exciting — because it's correct.
Why PostgreSQL for SaaS
Multi-tenancy with Row-Level Security. Every SaaS app needs tenant isolation — customer A must never see customer B's data. PostgreSQL's RLS enforces this at the database level:
-- Every query automatically filters by the current tenant
CREATE POLICY tenant_isolation ON projects
USING (tenant_id = current_setting('app.current_tenant')::uuid);
Even if your application code has a bug that forgets a WHERE clause, the database itself blocks cross-tenant data access. This is defense in depth — and it's what enterprise customers ask about during security reviews.
ACID transactions for billing. When a user upgrades their plan, you update subscription status, adjust feature limits, prorate charges, and send a confirmation email. If the proration fails, the entire operation should roll back. PostgreSQL guarantees this. MongoDB does not (reliably).
JSON support for flexible schemas. SaaS products often store user-configured settings, custom fields, or integration data. PostgreSQL's jsonb type lets you store and query structured JSON without a separate schema migration for every new field.
Scales further than you think. PostgreSQL handles millions of rows, thousands of concurrent connections (with PgBouncer), and complex analytical queries. Most SaaS products won't outgrow a single PostgreSQL instance until well past $10M ARR.
Managed PostgreSQL for SaaS
| Provider | Free Tier | Paid Plans | Best For |
|---|---|---|---|
| Supabase | 500 MB, 2 projects | $25/mo (Pro) | Full BaaS — auth, storage, realtime included |
| Neon | 512 MB, branching | $19/mo (Launch) | Serverless PostgreSQL, auto-scaling, DB branching |
| PlanetScale | 5 GB (MySQL) | $39/mo | If you must use MySQL |
| AWS RDS | 12 months free tier | $15–$200/mo | Production, compliance, full control |
| Railway | $5 credit/mo | Pay-as-you-go | Quick setup, usage-based pricing |
For MVPs: Supabase or Neon. Both have generous free tiers. Supabase bundles auth, storage, and realtime — less to configure. Neon offers serverless scaling and database branching for preview deployments.
For production: Supabase Pro ($25/mo) or AWS RDS. Enable point-in-time recovery, automated backups, and connection pooling.
Auth: Clerk or Auth.js
SaaS auth is more complex than standard app auth. You need:
| Feature | Why SaaS Needs It | Clerk | Auth.js |
|---|---|---|---|
| Email/password + OAuth | Basic login | Built-in | Built-in |
| Team invitations | Multi-user workspaces | Built-in | Manual (1–2 weeks) |
| Role-based access control | Admin vs member vs viewer | Built-in | Manual (1 week) |
| Organisation switching | Users in multiple workspaces | Built-in | Manual (1–2 weeks) |
| MFA | Enterprise requirement | Built-in | Via adapter |
| SSO (SAML/OIDC) | Enterprise sales requirement | Paid tier | Manual (complex) |
| Session management | Security, compliance | Built-in | Built-in |
| Webhook events | Sync auth events to your DB | Built-in | Manual |
Clerk saves 3–6 weeks of development time for SaaS auth. Team invitations, organisation switching, and RBAC are built in — features that take weeks to build with Auth.js. The trade-off is cost ($25/mo after 10k MAU) and vendor dependency.
Auth.js (NextAuth) is free and flexible but requires more development work. Good choice if you need maximum control or can't accept a third-party dependency for auth.
Our recommendation: Clerk for MVPs and early-stage SaaS. The time saved on team management alone justifies the cost. Migrate to Auth.js later if Clerk's pricing becomes prohibitive at scale.
Billing: Stripe
Stripe Billing is the standard for SaaS subscriptions. Here's what it handles:
| Feature | What It Does | SaaS Relevance |
|---|---|---|
| Subscriptions | Recurring billing with plan tiers | Core SaaS billing |
| Free trials | Time-limited access before charging | Conversion optimisation |
| Metered billing | Usage-based charges (API calls, storage) | Pay-as-you-go products |
| Proration | Automatic charge adjustment on plan change | Mid-cycle upgrades/downgrades |
| Customer Portal | Self-service plan management | Reduces support load |
| Invoicing | Automatic invoice generation | B2B requirement |
| Stripe Tax | Automated sales tax/VAT | Global tax compliance |
| Revenue recognition | Deferred revenue tracking | Accounting requirement |
| Dunning | Failed payment retry and recovery | Reduces churn |
Integration cost: $1,500–$4,000 depending on complexity. See our SaaS MVP cost guide →
Implementation pattern we use:
- Define plans in Stripe Dashboard (not in code) — easier to change pricing without deploys
- Sync plan data to your database via webhooks — source of truth for feature gating
- Use Stripe Customer Portal for self-service — users manage their own billing
- Handle webhooks with Inngest or Trigger.dev — reliable, retryable, observable
Don't build your own billing system. This advice applies at every stage. Even at $50M ARR, most SaaS companies still use Stripe. The complexity of handling proration, failed payments, tax compliance, and invoicing across jurisdictions is not a competitive advantage — it's a time sink.
Background Jobs: Inngest or Trigger.dev
SaaS products need reliable background processing for:
- Stripe webhook handling (subscription created, payment failed, invoice paid)
- Onboarding email sequences (day 1, day 3, day 7)
- Usage aggregation (calculate metered billing at end of billing period)
- Data exports (generate CSV/PDF reports asynchronously)
- Cleanup tasks (expire trials, deactivate dormant accounts)
| Tool | Approach | Best For |
|---|---|---|
| Inngest | Event-driven, durable functions | Webhook processing, multi-step workflows |
| Trigger.dev | Background jobs with scheduling | Cron tasks, long-running jobs |
| BullMQ + Redis | Queue-based | High-throughput, self-hosted |
| AWS SQS + Lambda | Cloud-native | AWS-heavy infrastructure |
For SaaS MVPs: Inngest. It handles Stripe webhooks reliably (automatic retries, idempotency), runs multi-step onboarding flows, and has a generous free tier. No Redis or queue infrastructure to manage.
Monitoring: Sentry + PostHog
You need two types of monitoring for SaaS:
Error tracking (Sentry):
- Catch unhandled exceptions before users report them
- Stack traces with source maps for production code
- Release tracking — know which deploy introduced a bug
- Performance monitoring — slow API routes, database queries
Product analytics (PostHog):
- Track feature usage per plan tier
- Funnel analysis (signup → onboarding → activation → payment)
- Session recordings for debugging UX issues
- Feature flags for gradual rollout and A/B testing
- Self-hostable for data privacy
Why PostHog over Mixpanel/Amplitude: PostHog combines analytics, session recordings, and feature flags in one tool. For SaaS, feature flags are essential — gate features by plan tier, test pricing changes, roll out new features to beta users first. Having this in the same tool as your analytics eliminates data silos.
Hosting: Vercel + Supabase
| Factor | Vercel + Supabase | AWS (DIY) | Railway |
|---|---|---|---|
| Setup time | Minutes | Days to weeks | Hours |
| Monthly cost (MVP) | $0 | $30–$100 | $10–$50 |
| Monthly cost (growth) | $45–$100 | $100–$500 | $50–$200 |
| Auto-scaling | Yes (serverless) | Yes (configured) | Yes |
| Preview deployments | Yes (automatic) | Manual | Yes |
| Database included | Yes (Supabase) | Separate (RDS) | Separate |
| Auth included | Supabase Auth or Clerk | Separate | Separate |
| SOC 2 | Vercel: Yes, Supabase: Yes | Yes | In progress |
| Best for | 90% of SaaS products | Enterprise, compliance-heavy | Budget-conscious teams |
Vercel + Supabase is the default SaaS hosting stack. Zero-config deploys from Git, automatic preview deployments for every PR, serverless scaling, and a combined cost of $0–$45/month for early-stage products. You don't need to think about infrastructure until you're well past product-market fit.
When to use AWS instead:
- SOC 2 Type II with VPC isolation requirements
- HIPAA compliance (Vercel doesn't sign BAAs)
- Custom infrastructure needs (Kafka, ElasticSearch, GPU instances)
- Your team has dedicated DevOps
The Complete SaaS Starter Stack
Here's what a new SaaS project looks like on day one:
| Component | Tool | Monthly Cost |
|---|---|---|
| Framework | Next.js 16 | $0 |
| Hosting | Vercel (Hobby → Pro) | $0–$20 |
| Database | Supabase (Free → Pro) | $0–$25 |
| Auth | Clerk (Free → Pro) | $0–$25 |
| Billing | Stripe | 2.9% + $0.30/txn |
| Resend | $0–$20 | |
| Monitoring | Sentry (Free) | $0 |
| Analytics | PostHog (Free) | $0 |
| Background jobs | Inngest (Free) | $0 |
| Total | $0–$90/mo |
That's a production SaaS stack — auth, billing, email, analytics, monitoring, background jobs — for under $100/month. The free tiers cover most products until they have paying customers. This is the lowest it has ever cost to build and run a SaaS product.
Common Mistakes
Microservices on day one. A Next.js monolith handles thousands of users. Splitting into microservices before you have product-market fit adds complexity, deployment overhead, and debugging difficulty. Monolith first. Always.
Choosing a database for theoretical scale. "But what if we have 100 million rows?" You don't. And PostgreSQL handles 100 million rows fine. Choose for developer productivity today, not hypothetical scale tomorrow.
Building custom billing. Stripe Billing handles subscriptions, trials, proration, dunning, tax, and invoicing. Building any of this yourself is a waste of engineering time at every stage.
Over-investing in infrastructure. Kubernetes, Terraform, multi-region deployments, blue-green deploys — none of this matters if nobody is using your product. Ship first. Optimise infrastructure when it becomes a bottleneck, not before.
Ignoring the marketing site. Your marketing pages (homepage, pricing, blog) are the top of your funnel. They should load fast, rank in search, and convert visitors. Next.js handles this natively — don't build a separate WordPress site for marketing.
LSD Dev Studio's SaaS Stack
Every SaaS project we build uses this exact stack: Next.js, TypeScript, PostgreSQL, Stripe, Clerk, and Vercel. We chose it because it's the fastest path from idea to revenue.
For SaaS pricing, see how much a SaaS MVP costs in 2026. For general tech stack guidance, read our complete tech stack guide. See our SaaS development services or get in touch.
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