• 🎯 Target Roles: Software Development Engineer (SDE) Intern, Backend Developer Intern, Full-Stack Developer Intern, AI/ML Engineering Intern.
• 🏆 Algorithmic Excellence:
  • Codeforces Specialist (@rajan_pant, Max Rating: 1420)
  • 614+ Problems Solved on LeetCode (@unbitten): 388 Medium, 180 Easy, 46 Hard.
  • Deep foundations in Graph Algorithms, Dynamic Programming, Tree Traversals, Greedy Approaches, and Data Structure Design.
• 🧠 Applied AI & GenAI: Production Retrieval-Augmented Generation (Hybrid Dense-Sparse RAG + BM25 + Reciprocal Rank Fusion), Knowledge Graph RAG, Upstash Redis caching (<5ms response), and MLOps observability.
• 💻 Core Engineering: High-throughput distributed backends, RESTful API architecture, NoSQL & SQL data modeling, Redis caching strategies, WebSockets (Socket.io), and containerization with Docker.

🔷 Codeforces Specialist Handle: @rajan_pant | Max Rating: 1420 Demonstrated problem-solving speed in timed contests across Combinatorics, Number Theory, Trees, and Graph theory.

🔶 LeetCode Problem Solver Handle: @unbitten | 614+ Problems Solved 388 Medium | 180 Easy | 46 Hard Strong algorithmic proficiency in Dynamic Programming, Binary Search, Heaps, and Backtracking.

Languages
Backend & APIs
AI / ML & Retrieval
Databases & Caching
Frontend UI
DevOps & Tools

Domain: Applied AI / ML, Distributed Backend, Full-Stack | Stack: React 19 (Vite), FastAPI, ChromaDB, Upstash Redis, Google Gemini 3.8 Flash, PyMuPDF
🌐 Live Demo: ai-rag-chatbot-frontend-v5sv.onrender.com | 📖 API Docs: ai-rag-chatbot-backend-v5sv.onrender.com/docs

• React 19 + Vite Modern SPA: High-performance client with multi-thread session history, interactive citation verification drawer, and real-time MLOps observability charts.
• Sub-5ms Query Acceleration: Integrated Upstash Cloud Redis caching layer cutting response latency from ~1,400ms down to <5ms (99.6% speedup) with auto-invalidation on document mutations.
• Hybrid Retrieval (Dense + Sparse): Combines dense 768-dim semantic vectors (ChromaDB) with BM25 keyword matching using Reciprocal Rank Fusion (RRF) to eliminate cosine-similarity false positives.
• Tenant-Scoped Session & Cache Isolation: Rigorous user_id partitioning on documents and Redis keys, preventing cross-tenant data leakage.
• Voice Conversation Loop & Robust Testing: Full STT $\rightarrow$ RAG $\rightarrow$ TTS pipeline backed by automated Pytest unit and integration tests in CI/CD.

Domain: Full-Stack Web Development, Cloud Services, Authentication | Stack: React (Vite), Node.js, Express, MongoDB, Tailwind CSS, Google OAuth 2.0, ImageKit
🌐 Live Demo: wheelio-spua.vercel.app

• End-to-End Car Rental Platform: Complete multi-role platform allowing customers to search, filter, and book rental vehicles while providing fleet owners an analytics dashboard for inventory and reservation management.
• Dual Authentication Architecture: Secure JWT email/password auth coupled with Google OAuth 2.0 Authorization Code flow and smart first-time onboarding.
• Location & Cloud Media Services: Integrated Geoapify Geocoding autocomplete for location-based pickup routing and ImageKit CDN for cloud vehicle image uploads.
• Modern Responsive UX: Built with React Router v7, Context API state management, Lucide icons, Hot Toast notifications, and a persistent dark mode toggle.

Domain: Full-Stack & Generative AI, State Management | Stack: React, Vite, Redux Toolkit, Node.js, Express, MongoDB, OpenAI API, ImageKit
🌐 Live Demo: resume-phi-teal-98.vercel.app

• AI Content Enhancement: Leverages OpenAI API to generate ATS-optimized professional summaries, bullet points, and skills recommendations tailored to target job descriptions.
• Centralized Redux State Management: Manages multi-step resume creation forms with dynamic real-time live preview rendering and instant PDF document export.
• Secure Backend Microservice: Express.js REST API with JWT-based session security, MongoDB persistent profile storage, and cloud asset hosting via ImageKit.

Domain: Full-Stack SaaS, Data Analytics, Microservices | Stack: TypeScript, React, Node.js, Express, MongoDB, Cron, Cloudinary
🌐 Live Demo: finance-tracker-e1pe.vercel.app

• Advanced MongoDB Aggregation Analytics: High-efficiency aggregation pipelines processing real-time expense breakdowns, income/spend comparisons, and multi-date financial health graphs.
• Automated Lifecycle Processing: Scheduled background cron jobs handling recurring transaction postings and auto-generating monthly fiscal audit reports.
• Enterprise Features: AI receipt scanning, CSV bulk transaction import/export, Cloudinary profile media integration, and secure JWT authentication.

Domain: Backend & Full-Stack Systems, Real-Time WebSockets | Stack: React, Material-UI, Node.js, Express, MongoDB Atlas, Socket.io, Docker

• Real-Time Event Operations: WebSocket-powered bi-directional event notifications ensuring immediate updates when events are scheduled, modified, or registrations cap out.
• Role-Based Access Control (RBAC): Distinct authorization workflows for Student attendees (1-click registration, personal history) and Admin coordinators (live analytics, attendee verification).
• Containerized Infrastructure: Docker and Docker Compose configuration for one-command local orchestration and environment parity.

• 📧 Email: rajanvish2005@gmail.com
• 💼 LinkedIn: linkedin.com/in/rajan-kumar-vishwakarma-1a4bb92a8
• 🏆 Codeforces: rajan_pant (Specialist - 1420)
• 🔶 LeetCode: unbitten (614+ Solved)
• 🐙 GitHub: @Rajan-vish
• ⚡ Open to: SDE Intern, Backend Engineer Intern, Full-Stack Intern, AI/ML Engineering Intern roles. Feel free to connect!