SaaS development built around tenant and data integrity
A SaaS product is defined by its boundaries: which tenant owns each record, which role may perform each action, how data evolves, and how the system behaves when requests are retried or deployments change the schema. My SaaS work makes those boundaries visible in the architecture.
What the work covers
Capabilities applied together, with the exact trade-offs documented in each case study.
Tenant isolation
Tenant context resolved at trusted boundaries, scoped queries, ownership constraints, and database-level protections that do not rely on UI hiding.
Roles and workflows
RBAC enforced on the server and reflected in the interface, with state machines and audit records for business-critical operations.
Data evolution
Relational models, forward migrations, backfills, decimal precision, transaction boundaries, soft deletion, and retention rules designed for a living product.
Operational confidence
Deterministic fixtures, end-to-end coverage, idempotent webhooks and writes, health checks, and observable delivery pipelines.
Relevant case studies4
Real systems, responsibilities, architectural decisions, constraints, and outcomes.
DynaPOS
Multi-Tenant SaaS POS Platform
- Period
- Apr 2026 - Jul 2026
A multi-tenant point-of-sale codebase for nine retail and service business types, with scoped roles, FIFO/WAC inventory, local billing, a large BDD specification catalogue, and a SHA-pinned self-hosted delivery path.
- QA automation
- Multi-tenant SaaS
- SHA-pinned delivery
Total Supply
Multi-Role Supply-Chain Platform
- Period
- Nov 2025 - Jan 2026
A multi-role supply-chain platform that lets customers order food and request cleaning or IT-support services, while six coordinated staff roles fulfil and track every job end-to-end through dedicated dashboards.
- RBAC with JWT claims
- OAuth 2.0 / OIDC
- Serverless Postgres
Prompt Copilot
Cross-Surface AI Prompt Manager
- Period
- Feb 2026 - Mar 2026
A cross-surface prompt-management ecosystem — a Next.js 15 dashboard, a Chrome MV3 extension, and a VS Code extension on one Prisma/PostgreSQL API — that lets developers organise, version, and one-click-insert reusable AI prompts into ChatGPT, Claude, Gemini, Perplexity, and the IDE.
- Chrome MV3
- VS Code Webview
- Self-referencing hierarchies
School Management System
Multi-Tenant Laravel Platform
- Period
- Jun 2026 - Jun 2026
A multi-tenant school-administration platform that lets a platform operator onboard schools and assign admins, while each School Admin manages their own teachers, grades, academic years, and student enrollments under role-based access control.
- Multi-tenant
- Model-layer isolation
- RBAC
Related engineering notes3
The principles and implementation patterns behind the project work.
- REST API Design Principles That Stand the Test of TimeLearn how to design APIs that developers love to use and are easy to maintain.
- Improving Next.js LCP: A Measured Production Case StudyA production Next.js LCP case study: isolate the real render delay, remove above-the-fold animation gates, compare repeated Lighthouse runs, and state the limits honestly.
- Testing React Apps Without False ConfidenceA boundary-first React testing guide grounded in a 2,117-scenario audit: build reliable unit, integration, and browser tests without false-green results.
Common questions
- What makes a SaaS architecture multi-tenant?
- Tenant ownership must be enforced throughout authentication, application queries, uniqueness constraints, background work, and reporting. A tenant selector in the interface alone is not isolation.
- How do you reduce cross-tenant data risk?
- Resolve tenant identity from a trusted session or key, scope every data operation, add database constraints where possible, test authorization paths, and keep audit evidence for sensitive mutations.
- Where is this demonstrated?
- DynaPOS documents row-level tenant scoping and accounting integrity; Total Supply records multi-role operations and data lifecycle controls; the other linked cases show additional tenancy and authorization patterns.