SaaS products where one codebase serves many customers with complete data isolation. The tenancy model is selected based on your target buyer: row-level security (PostgreSQL RLS with tenant_id column on every table, JWT claim extracted at the API gateway and set as app.tenant_id session variable, all queries filtered automatically) for B2C or high-volume SMB SaaS; schema-per-tenant (each customer gets a dedicated PostgreSQL schema, Flyway multi-schema migrations applied per tenant on onboarding, upper ceiling ~500 tenants before connection pool constraints appear) for B2B products targeting growth-stage companies; database-per-tenant (each customer gets a separate RDS instance provisioned via Terraform, connection routing by tenant subdomain or custom domain at the API gateway) for regulated industry buyers in healthcare and financial services who require physical data isolation.

Tenant provisioning automation: a new customer completes signup and a Temporal.io workflow or AWS Step Functions state machine provisions their resources -- schema creation, seed data, default roles, billing subscription, welcome email -- all within 60 seconds end-to-end. Idempotent provisioning steps ensure a failed step can be retried without creating duplicate resources. Cross-tenant isolation tested at the API layer: automated security test suite makes authenticated requests as Tenant A and verifies that Tenant B's resources return 403/404, not 200 -- enforcing isolation as a continuous regression test rather than a one-time design decision.

Stripe Billing integration covering recurring subscriptions (monthly/annual), trial management (free trial with or without credit card requirement), plan upgrades and downgrades with proration calculated by Stripe, usage-based metering via Stripe Billing Meters API (report usage events, Stripe aggregates and bills at period end), and invoice generation with custom line items for one-time charges. Stripe webhook events consumed and idempotently processed: invoice.payment_succeeded (activate/extend subscription), invoice.payment_failed (dunning sequence initiation), customer.subscription.deleted (account downgrade/deactivation), customer.subscription.updated (plan change acknowledgement). Dunning sequence: Day 1 automated email with Stripe-hosted payment update link, Day 3 in-app banner, Day 7 account suspension warning, Day 14 account suspended with data retention guarantee.

Feature flags by plan tier: LaunchDarkly or Unleash (self-hosted) gates features at the application layer with the customer's current plan stored as a context attribute. When a feature is requested by a customer on the wrong tier, the API returns HTTP 402 with a structured body ({ "upgrade_required": true, "feature": "advanced_analytics", "current_plan": "starter", "required_plan": "growth" }) that the frontend uses to render an upgrade prompt. This allows plan-gating any feature without a code deployment -- add a feature flag to the plan configuration and the feature gate propagates immediately. For Stripe alternatives: Lago (open-source billing engine, self-hosted, supports complex usage-based pricing models that Stripe Billing doesn't natively handle) available as an option where Stripe's pricing model flexibility is insufficient.

Team and workspace management, role-based access control (admin, member, billing, viewer), SSO via SAML or OAuth, audit logs, API key management, and webhook delivery for product events. The feature set enterprise buyers check before procurement approval -- built in from the start, not added when the first enterprise deal requires them.

Public API for third-party integrations, webhook delivery for product events, Zapier and Make connector support, and native integrations with the tools your customers already use (Slack, Salesforce, HubSpot, and others). The integration surface that makes your product a platform, not a silo.

Internal admin dashboard for managing tenants, monitoring usage, managing billing overrides, and supporting customers without needing database access. Usage analytics, churn signals, and product usage data surfaced to your customer success team. The operational tooling that lets your team run the product without relying on engineers for every support task.

Production infrastructure on AWS, Vercel, or GCP -- CI/CD pipeline, staging environments, database backups, monitoring and alerting, and auto-scaling configuration. Infrastructure that supports zero-downtime deployments and handles traffic spikes without emergency engineering involvement. Deployed to your cloud account, managed by you after handoff.

Before writing code, we design the data model, tenancy model, and API structure. The architecture review catches decisions that are cheap to change now and expensive to change later -- schema design, tenancy approach, billing model integration, and permission model. We document the architecture before development starts and get your sign-off.

We scope the product before pricing it. Discovery session to understand the user flows, a wireframe to validate the scope, and a defined feature list before the fixed cost is set. If the scope exceeds your budget, we cut to the essential core and build the rest in a subsequent phase. No hourly billing, no surprises at invoice time.

We build in two-week sprints with deployed builds at the end of each. You see working software every two weeks -- not a completed product at the end of 16 weeks. If something isn't right, we catch it at sprint review when changes cost hours, not at launch when they cost weeks.

We write code as if we're handing it to a different engineering team -- because we usually are. Standard frameworks, documented APIs, a clean codebase, and infrastructure-as-code. Your future engineers will recognise how it's built and be able to extend it without reverse-engineering our decisions.