Platform work starts with the two decisions that are expensive to change later: the tenancy model and the service boundaries. Those are designed and reviewed before feature work begins. From there we ship in sprints against a roadmap you own, with every schema change reversible and every release deployed blue-green. Teams usually take over feature development themselves once the platform concerns are in place.
Service 03 of 04
Custom B2B SaaS Architecture and Full-Stack Web Applications
B2B software is judged on two things customers rarely see: whether tenant data is truly isolated, and whether the platform keeps working at ten times the load it launched with. Both are architecture decisions made in the first weeks of a project and expensive to change later. We make them deliberately.
Our platforms are built on Next.js and TypeScript for the application layer, PostgreSQL with row-level security for tenancy, and real-time channels for the operational views that B2B users live in. Service boundaries are introduced where a domain genuinely needs independent scaling or deployment, not because a diagram looked better with more boxes.
TypeScriptNext.jsReactNode.jsPostgreSQLSupabaseRedisWebSocketsStripeTailwind CSS
Who this is for
- Founders taking a B2B product from a working prototype to a platform customers depend on
- Teams whose single-tenant codebase needs to become multi-tenant without a rewrite
- Companies adding real-time operations views, billing, or SSO to an existing product
What you receive
- Tenancy model with row-level security and tenant-scoped indexes
- Next.js application layer with a design system and typed API routes
- Real-time channels with presence and reconnection handling
- Authentication, SSO, RBAC, billing and metering, and audit logs
- Load test results against a production-sized replica
- Blue-green deployment pipeline with instant rollback
Architecture pattern
How the system is put together.
The components we ship, in the order a request moves through them. Every boundary is typed, every failure path is designed, and every action is logged.
- 1
Tenancy model
Shared database with row-level security and tenant-scoped indexes by default, with the option to isolate large tenants into their own schema or database without changing application code.
- 2
Application layer
Next.js App Router with server components for data-heavy pages, typed API routes and server actions, and a design system that keeps the product consistent as it grows.
- 3
Real-time channels
WebSocket channels for live operations views, with presence, optimistic updates, and reconnection handling so dashboards stay accurate under flaky networks.
- 4
Service boundaries
Background workers for long-running jobs, a separate service only where the domain demands independent scaling, and a shared contract package so types never drift between services.
- 5
Platform concerns
Authentication and SSO, role-based permissions, billing and metering, audit logs, and admin tooling built once and reused across every feature.
Failure prevention
Row-level security tests
Automated tests attempt cross-tenant reads and writes on every build, so isolation is proven rather than assumed.
Migration discipline
Every schema change is reversible, deployed ahead of code, and rehearsed against a production-sized replica.
Load testing before launch
Realistic traffic replayed against staging to find the query, the lock, or the N+1 before a customer does.
Blue-green deploys
Zero-downtime releases with instant rollback, so shipping on a Tuesday afternoon is routine rather than risky.
Targets we design to
<250ms
p99 API latency on core endpoints
0
cross-tenant data access paths, verified by automated tests
0 downtime
deploys through blue-green releases
Questions about this service
Shared by default, with row-level security and tenant-scoped indexes, because it is cheaper to operate and simpler to migrate. Large or regulated tenants can be isolated into their own schema or database without changing application code, because the tenancy boundary is enforced in one place.
Only where a domain genuinely needs independent scaling or deployment. Most B2B platforms are better served by a well-structured application with background workers and a shared contract package. Boxes on a diagram are not a goal.
Yes. We audit the codebase first, agree the boundaries, and introduce platform concerns like tenancy, auth, and billing incrementally rather than through a rewrite.
In production
Case studies built on this discipline.
Ready to scope custom b2b saas architecture for your team?
Book an architecture call. We will map the workflow, the systems it touches, and the number this discipline should move for you.
- No-obligation call
- Architecture first, build second
- You own all the code