SaaS Platform Delivery
Custom SaaS Engineering & Architecture
Design, architect, and deliver full-stack SaaS platforms with multi-tenant isolation, reliable subscription billing, and sub-second edge performance.
Written scope and a fixed-scope proposal. No sales calls.
Who this is for
The buyer this is written for
- Role
- Founder, CTO, or VP of Engineering building a new SaaS product or scaling an existing web application
- Organisation
- A B2B or B2C software business requiring high-concurrency architecture, Stripe/payment integrations, and secure multi-tenant data boundaries
- What triggers the search
- A need to launch a production-grade SaaS product quickly without accumulating technical debt, or an existing prototype that cannot scale under customer load.
The problem
What is actually going wrong
Multi-tenant data leakage and access control complexity
Designing secure organization boundaries, team roles, and row-level access permissions is complex. A mistake in tenancy architecture can expose customer data.
Payment webhook failures and subscription drift
Synchronous webhook handlers lock database threads during traffic spikes, and unhandled retry edge cases cause customer accounts to fall out of sync with billing.
Background tasks and long-running APIs blocking web requests
Synchronously processing file uploads, third-party API calls, or email queues starves application threads, causing 504 timeouts and slow UX.
What you get
Delivered in the engagement
- Full-stack production-grade SaaS application with clean modular architecture and end-to-end type safety
- Multi-tenant data model with strict row-level security and organization-scoped permission boundaries
- Asynchronous queue and worker pipelines for webhook ingestion and long-running background tasks
- Stripe or payment gateway subscription lifecycle integration with idempotent webhook handlers
- Automated CI/CD build, lint, and test validation pipelines
- Operational error telemetry and health monitoring integration
How it runs
The sequence
- 01
Model domain and data boundaries
Design the relational data model with strict multi-tenant organization boundaries, schema constraints, and role-based permissions.
- 02
Decouple async pipelines
Isolate long-running background jobs, email delivery, and webhook processing onto asynchronous message queues to keep web request threads sub-second.
- 03
Implement resilient billing
Wire subscription checkouts, invoice webhooks, and entitlement lifecycles with strict signature verification and idempotency keys.
- 04
Automate verification
Build end-to-end type-safe test suites covering authentication, tenant isolation, and billing state machines.
- 05
Deploy and harden
Deploy to edge or serverless infrastructure with real user monitoring, error tracking, and automated deployment guards.
Evidence
Engagements that prove this
Every claim below is drawn from a recorded engagement. Each links to its full case study, including the trade-offs that were accepted.
Primary evidenceSocial Networking • Jun 2026 • Next.js, PostgreSQL, React, Sentry, Stripe, Supabase, Tailwind CSS, TypeScript
A high-concurrency SaaS subscription platform with async webhook synchronization and row-level data isolation.
- Decoupled Stripe webhook processing to async queues eliminating thread locks under concurrent signups
- Implemented strict PostgreSQL row-level security ensuring 100% multi-tenant data isolation
- Zero-downtime database migrations with backward-compatible schema transitions
- Automated end-to-end integration tests preventing payment status desynchronization
Read the full case study →Marketing and Advertising • Jun 2025 • CSS, JavaScript, Laravel, MySQL, Nginx, PHP
An enterprise advertising operations SaaS platform handling high-volume background data processing.
- Asynchronous background queues resolved thread starvation during third-party API data sync
- Multi-account management engine with centralized automation rules
- Sub-second reporting dashboard for real-time campaign performance analytics
Read the full case study →Social Networking • Jul 2025 • Cloudflare, JavaScript, MySQL, Nginx, Python, React
A media distribution platform designed for edge caching and high-concurrency traffic.
- Decoupled video asset delivery with Cloudflare edge caching
- Optimized MySQL query execution reducing dashboard load times by 65%
Read the full case study →Wider evidence: Custom Operational Systems draws on 106 recorded engagements, from a corpus of 106 documented projects.
Questions
Answered directly
What stack do you use for SaaS engineering?
We engineer on TypeScript-native modern stacks: Next.js, Astro, React, PostgreSQL/Supabase, Cloudflare Workers, and Stripe. The architecture is chosen for sub-second performance, low operational overhead, and strong type safety.
How do you ensure multi-tenant security?
Tenancy is enforced at the database schema and query layer via Row Level Security (RLS) and organization scoping. Every database query resolves against the authenticated organization ID, preventing cross-tenant leakage by design.
Do you handle billing webhooks and payment failures?
Yes — we implement asynchronous, idempotent webhook receivers that handle retries, subscription cancellations, upgrades, and payment grace periods reliably without blocking web requests.
This page answers
- Who can build a custom B2B SaaS platform with Stripe billing and multi-tenancy?
- How do I architect a scalable multi-tenant web application?
- What is the best architecture for Next.js, Supabase, and Stripe SaaS apps?
- How do you prevent webhook race conditions in subscription billing?
- Who offers full-stack SaaS engineering with automated testing?
Start a written project inquiry
Describe your SaaS product, target users, data boundaries, required third-party integrations, and timeline to market.
You describe the problem in writing. You receive a written scope, an approach, and a fixed-scope proposal.
