Hello, I’m

Rajan Jasani.

AI engineer & software developer

At Crest Infosystems, I build retrieval pipelines, agent workflows, and APIs for AI products. I also contribute to Django India and explain system design on YouTube.

Explore my work View résumé

GitHub LinkedIn Email

**Rajan Jasani**Engineer. Builder. Community contributor.

Tools I build with

Python FastAPI Django React PostgreSQL AWS

Full skill set

Selected work

AI products and software I’ve helped ship.

KNOWLEDGE & DISCOVERY

Ask HipHop

A question is only as useful as the evidence behind its answer.

Engineering case study

I engineered citation-first retrieval, multi-knowledge-base APIs and asynchronous ingestion. Source quality, context and provenance stay connected from the first search to the final answer.

≈3,500: weekly users
40+: backend APIs
200+: articles ingested daily

Explore the platform and its approach to source-aware hip-hop research.

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Built with

FastAPI · React · PostgreSQL · Redis · Amazon S3 Vectors

Clinical documentation

JudyAI

From a consultation to a clinician-reviewed draft.

Built workflows for recorded and live consultations, speaker-labelled transcripts, SOAP notes and structured medical data. Clinician review stays part of the process, supported by role-based access, audit records and retries.

Human review built into the workflow

FastAPI
React
AWS Bedrock
Transcribe Medical

Private client project

Curriculum-aware learning

BinaAI

Answers that stay connected to the course material.

Designed curriculum-aware retrieval, an embedding service and asynchronous ingestion for textbooks and video. Added streaming answers, structured quizzes and evaluation workflows for a student-facing learning platform.

1,200 students · 60+ textbooks · 500+ video hours

Django
FastAPI
PostgreSQL
Redis

Engineering case study

More projects

Tools, experiments & client systems

Side project

AI Video Production Agent

Narration to a finished technical video.

Tool-driven scene planning, synchronised captions, architecture diagrams and deterministic 1080p rendering.

TypeScript · Remotion · React · Node.jsView repository

Experiment

Hybrid RAG Playground

Make retrieval decisions inspectable.

A place to explore document retrieval with vector and lexical search, and inspect the results behind an answer.

FastAPI · pgvector · ElasticsearchView repository

Client project

Measurement Management

Field operations that work offline.

Site measurements, reporting and offline data synchronisation for a civil engineering firm in Surat.

Django REST Framework · React · PostgreSQLVisit project

Client project

Midland Purchase Optimization

Procurement across 80+ suppliers.

Backend services for purchasing workflows, reporting and data processing, with contextual Generative AI insights.

Python · FastAPI · PostgreSQL · ReactPrivate client project

BEHIND THE WORK

About me

I like understanding how the whole system fits together.

I’m a software engineer with 2+ years of experience building production backend and Generative AI systems. My work spans retrieval, agentic workflows, asynchronous processing and the interfaces people use to make sense of them.

I care about the parts that make a product dependable: where an answer came from, what happens when a job fails, and how a person stays in control. Python, FastAPI, Django and AWS are a big part of that work.

Outside project work, I speak at Django community events and share what I’m learning through Engineering Systems.

Meet the community side

Experience

Building products.
Learning from real constraints.

Software Engineer L2

Crest Infosystems Pvt. Ltd.

May 2024 — Present

Building full-stack applications, APIs and production AI workflows across research, learning and clinical documentation products.

Designed ingestion pipelines processing 200+ articles daily from 35+ RSS feeds.
Built retrieval, tool calling, structured outputs, guardrails and evaluation workflows for user-facing products.
Developed backend services with Django, FastAPI, PostgreSQL and AWS, with asynchronous processing and production reliability in mind.

Backend Developer Intern

Crest Infosystems Pvt. Ltd.

Jan 2024 — May 2024

Developed REST APIs, database schemas, validation, serialisation and business logic using Python, Django and Django REST Framework.

Skills & tools

Python and TypeScript across AI, backend, and product development.

Languages

Python
TypeScript
JavaScript
SQL

Backend & APIs

FastAPI
Django / DRF
SQLAlchemy
Pydantic
REST APIs
WebSockets
Redis workers
Kafka
Amazon SQS

AI & retrieval

RAG / GraphRAG
Hybrid search
Reranking
LangChain
LangGraph
Tool calling
MCP
OpenAI API
Hugging Face
Whisper
LLM evaluation
Structured outputs
Guardrails

Data

PostgreSQL
MySQL
Redis
pgvector
Amazon S3 Vectors
Pinecone

Cloud & delivery

AWS
Bedrock
S3
Lambda
Step Functions
ECS / EC2
Cognito
Docker
CloudFormation
CI/CD

Frontend & testing

React
Vite
Tailwind CSS
pytest
Playwright
Git
Scrapy

Systems I engineer

The engineering work behind the interfaces.

Retrieval & orchestration

Knowledge-base routing, source prioritisation, tool calling and grounded generation.

Ask HipHop · BinaAI

Asynchronous ingestion

Document and media processing, background workers, semantic indexing and recoverable workflows.

Ask HipHop · JudyAI

Product backends

APIs, authentication, access control, durable state and offline synchronisation.

JudyAI · Measurement Management

Built with the community

Talks, contributions, and a shared interest in Django.

SPEAKING

Django India, Surat

Delivered “Beyond .all(): Mastering Django ORM from Basics to Brilliance”, covering query optimisation, ORM techniques and practical patterns for Django applications.

Explore the meetup

CONTRIBUTING

DjangoDay India

Led development of the DjangoDay India 2025 website, bringing the programme, speakers, sponsors and community together in a responsive event experience.

Visit DjangoDay India

LEARNING IN PUBLIC

Engineering Systems

Making the system easier to understand.

My YouTube channel explores distributed systems, APIs, load balancing and architecture patterns. It’s a place to turn technical ideas into explanations you can follow.

Watch on YouTube

I also build tools for turning technical narration into animated lessons, with AI scene planning and deterministic Remotion rendering.