Freelance Security & Identity Programmer: OAuth 2.0, OIDC, JWT Gateways, Web Crypto & DevSecOps

Authentication, authorization, and cryptographic key management sit at the trust boundary of every SaaS, FinTech, and Healthcare platform. Whether you need a custom OAuth 2.0 / SMART-on-FHIR identity bridge, zero-knowledge client-side PBKDF2 + AES-GCM encryption, or hardened public AI webhooks, hiring a security-first Senior Freelance Programmer prevents costly vulnerabilities before they reach production.

Hire Aldian Fazrihady on Upwork for identity architecture, OAuth2/OIDC engineering, and DevSecOps hardening.

Security & Identity Engineering Case Studies

• Client-Side Cryptography: Securing Local API Keys with PBKDF2 & AES-GCM
• Securing Public AI Webhooks: Mitigating Resource Exhaustion and JWT Vulnerabilities in Express
• Multi-Tenant HIPAA Identity with AWS Cognito, OAuth 2.0, and SMART-on-FHIR
• Architecting a Token-Exchange Gateway: Bridging External Identity Providers with Custom JWTs
• Securing AI Coding Agents: Building Ephemeral Docker Sandboxes for Claude Code and Cline