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OBOX SYSTEMS ADVISORY & WORKSHOPS

SAAS CODE AUDIT

Pre-launch security, performance & architecture audit for production SaaS

SAAS CODE AUDIT Logo

Find the tenant-isolation gap before your client does.

A tenant isolation failure in production isn’t a bug report — it’s a contract termination. For multi-tenant SaaS, one missing customer_id check means Client A can query Client B’s data, and by the time you discover it post-launch you’ve violated contracts and triggered security reviews at every premium client. A Zod field required in the frontend but Optional in Pydantic with no default throws no error and fails no test — just silently malformed records from day one.

A senior engineering team — not a single reviewer, not an automated scanner — audits your codebase domain by domain and delivers a severity-tagged findings report: file:line references, reproduction steps, and recommended fixes across the six domains that matter most before launch. We audit and report; we don’t build — that separation keeps the findings objective. You own the report: full findings document, severity matrix, and fixes, with no subscription.

We can help you with:

  • Multi-tenant isolation — customer_id enforcement across ORM calls, raw SQL, bulk operations, and background jobs; IDOR risk surface mapped
  • Authentication & session flow — signing chain, OTP logic, session fixation, replay attacks, and privilege escalation paths
  • Performance — N+1 queries, missing indexes, connection pool sizing, and race conditions at 200+ concurrent user load
  • Schema drift — Zod ↔ Pydantic type consistency across the full API boundary
  • Architecture — helper duplication, shared library usage, error handling consistency, circular dependencies
  • Secret management & PII exposure — env var handling, log scrubbing, credential rotation, PII-in-logs scan
  • and more.

Launching soon? Let’s scope your audit surface before a client finds the gap. Book your free call!

Technologies we use

  • Python
    Python
  • TypeScript
    TypeScript
  • React
    React
  • FastAPI
    FastAPI
  • PostgreSQL
    PostgreSQL
  • Pydantic
    Pydantic
  • Zod
    Zod
  • SQLAlchemy
    SQLAlchemy
  • Docker
    Docker
  • GitHub Actions
    GitHub Actions

Packages

A call about the audit: which tenants, which authentication paths, and which regulator or customer is asking for it.

1 day

Book the Call

We test tenant isolation and the authentication flow first, so the shape of the full audit is known before it is booked.

7 days

Request Scoping

Scoped full audit — all six domains, remediation review pass, final sign-off included.

30 days

Scope the Engagement

A standing audit relationship: every release read against the last report, remediation your own team ships verified independently, and the severity matrix kept current as the product grows.

90+ days

Scope the Engagement

FAQ

  • A severity-tagged findings document (Critical / High / Medium / Low) with a file:line reference, reproduction path, and recommended fix per issue. Every finding is actionable — the report functions as a sprint backlog, not a consulting summary.

  • The Discovery Phase audits one domain — tenant isolation and authentication — in 7 days. The Pilot Phase covers all six domains: security, N+1 queries, schema drift, architecture, secret management, and PII exposure across the full codebase.

  • We report and recommend. Remediation is a separate engagement — our Vibe Code Rescue or SaaS Development service. This separation keeps the audit objective: the auditor shouldn’t also bill to fix what they find.

  • We trace every query path for customer_id enforcement — ORM calls, raw SQL, bulk operations, and background jobs. We map the IDOR risk surface: which endpoints accept IDs as parameters, which validate ownership, and which don’t.

  • Static analysis finds syntax-level vulnerabilities. We find architectural ones — a customer_id present but never validated, a race condition in a background job, a Zod field required but Optional in Pydantic. These require human judgment, not pattern matching.

  • Read-only GitHub repository access only. We never require write access or local setup. The codebase stays in your version control — we review from a branch off your main, and you revoke access after delivery.

  • customer_id enforced at model save but absent from query filters — background jobs bypassing tenant boundaries. Zod required fields mapped to Pydantic Optional with no default — null propagation on edge-case requests. OTP replay windows left open by missing rate limiting. Each delivered with file:line reference, reproduction path, and recommended fix.

  • Yes. We sign NDAs before any codebase access is granted, on request.

  • You do. The full findings document, severity matrix, and recommended fixes are fully assigned to you on completion — no vendor lock-in.

  • Yes. Signed contracts with fixed scope per phase. You’re contracting with a registered entity, not an individual.

Book a free call

Consult with our engineering team to define the perfect solution for your needs.

Book a call
30 minutes

Contact Us

Email support@obox.systems WhatsApp Message us Phone +1 350 750 9649 LinkedIn out-of-the-box-systems Twitter / X @LearnTogetherP GitHub obox-systems

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