"Cem Deniz Demir"

• ▸Diagnosed and resolved two production issues in third-party integrations: traced form submissions failing only in production to the provider’s Cloudflare bot protection and coordinated the fix with their team; identified that site analytics were reporting to another agency’s Google Analytics property, located the account owners, and restored access.
• ▸Replaced the full database seeding approach with an incremental delta-sync engine (Dem DB), so only changed records are transferred on each deploy instead of reloading the entire dataset. Enforced environment isolation and routed all production mutations through a sandboxed gateway.
• ▸Built TT Custom, a full-stack order management platform with 14 REST endpoints, using Next.js, TypeScript, PostgreSQL, and Prisma; hardened the entire request lifecycle with argon2 password hashing, Zod schema validation, HTML sanitization, httpOnly session cookies, IP-based rate limiting, and strict CORS policies.
• ▸Rebuilt the asset delivery pipeline for efantanet.com with automatic WebP conversion served from Cloudflare R2, measurably improving page load performance (Lighthouse); delivered the platform as a multilingual (TR/EN) site serving visitors in 50+ countries.
• ▸Automated the Cloudflare R2 → Firebase pipeline with ETag-diff bucket synchronization and a cache-hard, purge-precise CDN layer (1-year edge cache, authorized URL-based purge at upload time), replacing a three-step manual release process.
• ▸Reduced API response times by restructuring Prisma queries and tuning PostgreSQL indexes; resolved recurring N+1 query issues.
• ▸Rebuilt the asset delivery pipeline for efektanet.com with automatic WebP conversion served from Cloudflare R2, measurably improving page load performance (Lighthouse); delivered the platform as a multilingual (TR/EN) site serving visitors in 50+ countries.
• ▸Built Playwright end-to-end test coverage for authentication flows and API security paths, including session management, authorization boundaries, and rate-limit behavior.
• ▸Delivered an internal admin panel (Dem Admin) with Next.js and Tailwind CSS, featuring Firebase Auth and role-based access control (RBAC).

• ▸Developed bakiciste.com⁠ , a credit-consultancy survey platform enabling secure multi-step data collection with REST API integration and form validation flows.
• ▸Designed and implemented responsive dashboards for an internal office reporting tool, streamlining reporting workflows and reducing manual steps for operations staff.
• ▸Built a reusable Next.js project template with REST API integration patterns, standardizing project setup and improving cross-product consistency.

• ▸Shipped production-ready frontend components and resolved system bugs for internal applications utilizing React, Next.js, TypeScript, and Tailwind CSS, ensuring stable feature delivery.

• ▸Developed a commercial web platform on Express.js and MongoDB; improved frontend rendering performance with custom JavaScript.
• ▸Migrated the backend to Laravel to leverage its ORM and administration tooling.

• ▸Built simple console applications in C to learn core fundamentals.
• ▸Developed small Java and C# apps with database connections.
• ▸Created Arduino programs in C++ for hardware coursework.

// Next.js | TypeScript | Prisma | NextAuth

• ▸Developed a reusable Next.js + TypeScript template with Prisma and NextAuth for authentication, session handling, and profile management in both server and client components.
• ▸Built safe-parse actions, dynamic login/signup forms, automatic OAuth–credentials account linking, and a chained middleware stack: rateLimiterMiddleware, securityHeadersMiddleware, authMiddleware, loggerMiddleware.
• ▸Implemented nonce-based security headers, environment-driven configuration, and authentication-aware redirects.
• ▸Added profile features for editing data, merging or deleting accounts, and one-click logout.

// Next.js | TypeScript | TailwindCSS | i18n

• ▸Built a frontend-only file system interface with dynamic navigation and backend-linked data via unique IDs.
• ▸Implemented internationalization (i18n) for multi-language support.
• ▸Designed modular components and client-side rendering for performance and scalability.
• ▸Created a clean, responsive UI with TailwindCSS and structured TypeScript code.