Rajan Jasani

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Backend Engineer • System Builder

I build scalable backend systems, SaaS platforms, and AI-powered products using Python, Django, FastAPI, AWS, and Vector Databases.

Tech Stack

Technologies I use to build scalable and efficient systems

Backend & APIs

Python
FastAPI
Django
Django Rest Framework

Frontend

JavaScript
ReactJs
NextJs

Database & Vector

PostgreSQL
VectorDBs
Pinecone
Pg-Vector Extension
S3 Vector Bucket

Cloud & DevOps

AWS
S3
EC2
Git
GitHub

Experience

My professional journey and key achievements

Software Engineer L2

Crest Skillserve Pvt Ltd. | Surat

May 2024 - Present
  • Currently building a Citation heavy - Agentic Chatbot with RAG capabilities for HipHopCulture, integrating microservices for document processing, vector search, and user interaction, with capabilities to handle PDFs, Article Pages, and Youtube Videos as knowledge base sources
  • Integrated AI features using OpenAI APIs and Pinecone for semantic search and intelligent automation
  • Built an end-to-end RAG Chatbot for a Traditional Chinese Medicine-based RAG chatbot using a microservices architecture, supporting a knowledge base of 600+ videos and 100+ textbooks, with services for video transcription, PDF/text vectorization, query processing, similarity search, and core application logic
  • Built a cricket video analysis system that extracts player keypoints using RTMPose and detects the cricket bat with a retrained YOLOv8 model

Backend Developer Intern

Crest Infosystems Pvt Ltd. | Surat

Jan 2024 - May 2024
  • Assisted in API development tasks, including database design, endpoint creation, and data serialization for real-world client projects

Projects

Showcase of my recent work and contributions

FNMA Underwriter

FNMAUnderwriter

AI-powered CSV data analytics platform that enables seamless data analysis through intelligent chat. Upload CSV files and interact with an advanced AI assistant to extract insights, identify trends, and make data-driven decisions. Features include AI-powered chat for natural language queries, automatic data cleaning and transformation, AI-generated Excel-style formulas, stunning interactive visualizations and dashboards, and enterprise-grade encryption for secure data handling.

AI AnalyticsCSV ProcessingNLPData Visualization
HUD Chatbot Project

HUD Finance-focused RAG Chatbot

Built the backend for a HUD (Housing and Urban Development) finance-focused RAG chatbot. Included document upload, processing, and question-answering capabilities using vector search for intelligent document retrieval.

FastAPIPythonVector DatabasesPineconeOpenAIRAG
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Google/Yelp Review & Marketing Widgets Backend

Recently built a FastAPI-based backend for generating customizable Google/Yelp reviews and marketing widgets. Scraped Yelp, used Google Reviews API, and utilized templates to produce a simple two-line HTML embed (div + script) for easy website integration.

FastAPIPythonWeb ScrapingGoogle Reviews APIYelp API
MMS Project

Measurement Management System

Delivered a Measurement Management System for a civil engineering firm in Surat. Streamlined site data collection and reporting processes, and included an offline data sync process for seamless field operations.

DjangoDjango REST FrameworkPostgreSQLReactOffline Sync

Systems I Engineer

Infrastructure and architectures I build

Payment processing pipelines
Web scraping & automation engines
Content Processing Pipelines for RAG chatbots
RAG pipelines & vector search
Auth systems & role-based access
High-scale APIs

I build systems
that scale.

Engineer by profession. System builder by obsession.

I design software the same way I design my life — disciplined, intentional, and optimized for long-term growth.

I work with Python, Django, FastAPI, AWS, PostgreSQL, and modern vector databases to build SaaS platforms, automation engines, and AI-driven products.

Not flashy. Not noisy. Just well-engineered.

Let’s connect

If you're building something serious — infrastructure, SaaS, or AI — let’s talk.