ABDULRAHMAN TAMASSILI KHANJI.
Change your life with technology.
Engineering reliable software architectures, responsive web platforms, and intuitive interfaces with relentless neo-brutalist precision.
ARCHITECTURAL LOGIC
Bridging full-stack precision with cloud scalability, clean code, and automated workflows.
BACKEND & APIS
Building clean, scalable backends with ASP.NET Core, C#, Python FastAPI, and PostgreSQL databases.
FRONTEND MASTERY
Crafting responsive, high-performance web applications using Angular, TypeScript, Signals, and Tailwind CSS.
AI & MODERN TOOLS
Exploring and integrating RAG architectures, LLM automation pipelines, and modern DevOps tools.
STACK & PROFICIENCY
Engineered with deep mastery across modern language ecosystems, cloud infrastructure, and intelligent workflows.
FEATURED SYSTEMS
AI-powered restaurant management platform with real-time AI chatbots, menu intelligence (RAG), WebSocket streaming via SignalR, multi-tenant architecture, and loyalty rewards system serving restaurants in the Middle East.
Full-stack pet health platform with AI Digital Twin system, veterinary booking flows, subscription billing, AWS S3 media storage, Resend OTP email verification, and multi-currency wallet system.
Autonomous agentic AI platform for pet care with 10+ function-calling API tools, Gemini Flash RAG middleware, chunked response streaming, and intelligent multi-step reasoning workflows.
Designed and developed a database-driven management system for monitoring and managing the end-to-end seawater desalination and bottling process, featuring a normalized 40-table PostgreSQL schema for complete batch-level traceability.
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CAREER & ENGAGEMENTS
Proven track record in high-concurrency microservices, AI middleware, and cloud database architecture.
Backend Developer
- ▶ Owned backend architecture across 5+ production platforms (PetVivo, Dine AI, Agentic AI) serving 20,000+ users across the Middle East, USA, and Canada, building reusable typed repository patterns and standardized API wrappers that cut boilerplate by 35%.
- ▶ Sole AI-backend integration engineer: built Gemini Flash RAG middleware with 10+ function-calling API tools, streaming chunked responses via WebSockets (SignalR) and powering real-time AI chatbots for 20k+ users.
- ▶ Reduced PostgreSQL query latency by 70% (850ms to 298ms) through EXPLAIN ANALYZE profiling, B-Tree indexing, recursive CTEs, connection pooling, and Redis TTL caching under production load.
- ▶ Hardened payment gateways against fraud and SQL injection using rate-limiting, idempotency keys, and request validation, preventing $2,000+ in monthly abuse and passing security audits.
- ▶ Built real-time webhook middleware and hierarchical self-referencing data structures (recursive CTEs) for multi-level menus, eliminating over-fetching and resolving multi-user editing conflicts.
- ▶ Integrated AWS S3, Resend SMTP for OTP verification, Cloudflare DNS/SSL routing, and built subscription billing and loyalty reward systems that increased engagement by 25%.
- ▶ Shipped 5+ apps end-to-end: database design, API development, Bcrypt/AES security, Docker containerization on Linux, CI/CD pipelines, and agile sprint management on Azure DevOps in a 10-person team.
Full-stack Developer Intern
- ▶ Data Integrity: Re-designed a normalized PostgreSQL schema that eliminated record duplication for 500+ beneficiaries in a Charity Management System.
- ▶ Process Automation: Developed a full-stack case management system with role-based access control (RBAC), reducing manual coordination overhead for 15+ staff members.
- ▶ Contributed to improving operational efficiency through structured data pipelines and automated workflows.
INITIATE CONTACT
Available for principal architecture contracts, high-impact consulting, or full-time technical leadership. Let's discuss your system requirements.