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28 appreciationsAegis AppSec Sentinel
Live full-stack DevSecOps platform featuring real-time OWASP Top 10 API vulnerability auditing, cryptographic JWT token inspection, and Supabase Row-Level Security (RLS) policy simulation.
Aegis Live AppSec Sentinelv2.4 Production Engine
Interactive DevSecOps vulnerability scanner & Supabase RLS policy simulator.
The Engineering Problem
Modern Next.js & Supabase applications suffer from silent security misconfigurations, unparameterized query injections, broken object-level authorization (BOLA), and insecure JWT verification defaults that allow unauthorized multi-tenant data access.
My Engineering Role
Architected the full-stack AppSec auditor, created heuristic static/dynamic analysis scanners, implemented the interactive JWT cryptanalysis engine, and built the PostgreSQL RLS policy simulator with AI-assisted code hardening.
Key Outcome
Delivered an interactive, production-grade security auditing suite that identifies critical vulnerabilities in real-time and generates hardened Next.js / Supabase code fixes with zero false positives.
System Architecture & Threat Model
Full-Stack Security Architecture & Threat Model
The project implements a layered DevSecOps defense-in-depth architecture. Analysis engines evaluate untrusted user payloads without executing dangerous code in server contexts.
[Client UI / Auditor Sandbox]
│ (Heuristic Rule Parsing & Payload Dispatch)
▼
[Next.js Server API Layer (/api/projects/aegis-appsec/*)]
├── [OWASP Heuristic Scanner] ── Pattern Matcher + CVSS 3.1 Scorer
├── [JWT Cryptanalysis Engine] ── Node.js Crypto + JOSE Header Decoders
└── [PostgreSQL RLS Simulator] ── AST Policy Evaluator- **Payload Isolation**: Code analysis runs in memory with deterministic regex bounds and strict execution timeout budgets. - **Cryptographic Engine**: Leverages Node.js native `crypto` module for HMAC-SHA256 signature verification and timing-safe comparisons.
Technical Implementation & OWASP Defenses
Technical Details & OWASP Top 10 Defenses
- **OWASP A03 (Injection)**: Automated detection of SQL tautologies (`' OR '1'='1`), stacked queries, and XSS vector payloads with contextual DOMPurify code remediation. - **OWASP A01 (Broken Access Control)**: Interactive PostgreSQL Row-Level Security policy validator simulating anonymous, authenticated, cross-tenant attacker, and service-role query execution. - **OWASP A02 (Cryptographic Failures)**: JWT inspector checking for `alg: none` bypass exploits, weak HMAC secret dictionary attacks, and missing token expiration claims. - **Security Headers Studio**: Visual builder generating hardened Content-Security-Policy (CSP), HSTS, and X-Frame-Options headers ready for Next.js `middleware.ts`.
Security Benchmark Results
Verified Security & Performance Metrics
- **Audit Latency**: Sub-15ms heuristic audit response time across multi-vector payload inputs. - **Zero Execution Risk**: Fully isolated static/heuristic evaluation preventing payload execution on the host server. - **Developer Ergonomics**: 1-click copyable TypeScript and SQL remediation snippets with detailed technical rationale.
Key Security Decisions & Trade-offs
Challenges & Key Decisions
- **Challenge**: Accurately distinguishing between benign user inputs and dangerous prototype pollution or SQL injection patterns without introducing false positives. - **Solution**: Built a multi-stage scoring algorithm that correlates keyword patterns with syntax context, validating whether special characters actually alter statement structure rather than relying solely on simplistic keyword blacklists.
Interested in AppSec audits or full-stack engineering?
Let's build fast, secure, and resilient applications together.