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Usaid-Bin-Rehan/README.md

Hi there, I'm Usaid Bin Rehan 👋

Usaid Bin Rehan

👨‍💻 About Me

Coding

  • 💼 Executive Software Engineer at QBS Co. (June 2024 – Present)
  • 🧠 Backend & Distributed Systems Specialist with strong focus on .NET Core, Enterprise Microservices, and Cloud-Native Architecture
  • 🧩 Lead contributor in .NET Core, Kubernetes, gRPC, and event-driven systems
  • 🤖 Deeply interested in Agentic AI, LLMs, and RAG-based enterprise solutions
  • 🏗️ Advocate of Clean Architecture, SOLID principles, and scalable system design
  • 🧑‍🏫 Mentored 5+ interns and junior engineers through production-grade onboarding and architecture reviews
  • 🔍 Regularly provide L3 production support, debugging real-time issues and improving observability
  • 🚀 Passionate about transforming complex legacy systems into modern, resilient platforms
  • 🎯 Career Goal: Become a Staff/Principal Engineer driving architecture, AI adoption, and platform scalability

💼 Professional Experience

🏢 QBS Co. — Executive Software Engineer

June 2024 – Present

  • Developed and maintained high-performance backend APIs using ASP.NET Core, PostgreSQL, and EF Core
  • Led architectural consistency across microservices, reducing technical debt and improving maintainability
  • Enabled scalable inter-service communication using gRPC and NATS
  • Orchestrated Docker and Kubernetes deployments with readiness/liveness probes
  • Introduced unit testing strategies and improved sad-path coverage for critical workflows
  • Collaborated cross-functionally with Analytics, UI/UX, SDET, DevOps, and stakeholders
  • Delivered L3 production support, resolving slow queries, hotfixes, and live incidents
  • Actively participated in requirement analysis, WBS refinement, and documentation

🛠️ Tech Stack

🧑‍💻 Backend & Databases

C# .NET Postgres SQL Server Redis

🧩 Architecture & Messaging

Microservices Clean Architecture SOLID gRPC NATS RabbitMQ

☁️ DevOps & Cloud

Docker Kubernetes Azure AWS

🤖 Agentic AI & R&D

LLMs RAG LangChain FastAPI PgVector FAISS


🎓 Education

FAST National University of Computer & Emerging Sciences

BS Computer Science


🚀 Key Projects

🔐 Lockkeyz (PASHA ICT 2025 Security Award)

.NET 8 · Redis · gRPC · Ocelot

  • Designed reusable core architecture adopted across multiple enterprise systems
  • Implemented JWT-based Auth, RBAC, Redis session manager, and notification gRPC service
  • Introduced FluentValidation, Idempotent Keys, Quartz Scheduler, and distributed locks (Redlock)
  • Conducted POCs for Nginx and API Gateway strategies prior to Kubernetes migration

🚚 PSO Blue Cylinder Delivery

.NET API · Postgres · Kubernetes · PowerBI

  • Refactored a tightly coupled legacy monolith under production pressure
  • Designed RBAC system using optimized in-memory data structures
  • Delivered delayed referral feature integrating payment gateways and wallets via gRPC
  • Optimized cron-based workflows and supported PowerBI CDC-based reporting

🧰 Ajeek CRM & Field Service (Saudi)

.NET 8 · SignalR · NATS · Kubernetes

  • Built real-time chat using SignalR (SSE + sockets)
  • Integrated NATS JetStream for low-latency notifications
  • Delivered client’s most praised feature with minimal QA feedback

🏭 Plant Asset Maintenance

.NET 8 · Redis · Quartz · gRPC · Kubernetes

  • Architected foundational microservices (Auth, WorkCenter, Cronjob, Ordering)
  • Optimized Redis performance reducing scan times from minutes to seconds
  • Designed custom IQueryable extensions for high-performance filtering

🧠 Talent & Human Capital Management (Agentic AI)

.NET 8 · Redis · RAG · Agentic AI

  • Refactored AI prototype into enterprise-grade, package-free .NET template
  • Implemented Redis-backed agent memory with LLM FinOps optimizations
  • Prototyped multitenancy and evaluated OIDC SSO & LinkedIn integrations

🤝 Connect With Me


⭐️ From Usaid Bin Rehan

Pinned Loading

  1. NUCES_SDA_FASTicket NUCES_SDA_FASTicket Public archive

    MERN Event-Booker with TDD and UI/UX

    JavaScript

  2. NUCES_CN_Dynamic_Multiplayer NUCES_CN_Dynamic_Multiplayer Public archive

    Collaborative Dynamic Multiplayer Game

    JavaScript

  3. FAST_Resources_Reverse_Indexing FAST_Resources_Reverse_Indexing Public

    Search-Engine for FAST-Resources

    Jupyter Notebook 1 2

  4. ChatCraft24_Winning_Submission ChatCraft24_Winning_Submission Public archive

    FAST-NUCES Procom'24 Competition

    Jupyter Notebook

  5. Omdena_Omdi_RASA_3x_GPT Omdena_Omdi_RASA_3x_GPT Public archive

    Forked from OmdenaAI/nigeria-chapter-interactive-chatbot

    Cost-Effective Fallback & GPT & FAISS

    Python

  6. RPA_FuzzyMatcher RPA_FuzzyMatcher Public

    Fuzzy-Match ERP Clean-VSA FastAPI

    Python