Jishnu Saha Portfolio

Jishnu Saha

About

Experience

Projects

Skills

Certificates

Education

Contact

Blog

About

Experience

Projects

Skills

Certificates

Education

Contact

Blog

About Me

Full-stack software engineer with 6+ years of experience building and shipping production-grade web applications and AI-powered products. Proficient in Python, Django, React, and Next.js, with hands-on expertise in LLM integration (LangChain, LangGraph), cloud-native AWS architecture, and RESTful API design. Proven ability to own features end-to-end — from architecture planning to deployment — in fast- moving startup environments.

A Full Stack Web APP and AWS DevOps Engineer.

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My Experience

Experienced IT software engineer with over 5 years of diverse industry experience, specializing in web app development and AWS DevOps.

Software Engineer (Remote)

Dualflow, San Francisco.

Sep 2025 - Present

Developing an AI-powered career learning & job-readiness platform for data and AI professionals
Contributing on product planning, project architecture.
Contributing on both frontend and backend system to develop a seamless user friendly service for user. Tech Stack: Django, NextJS.

Software Engineer (Remote)

Remotedevs.com, Lithuania.

June 2025 - Sept 2025

Contribute to the frontend foundation of a global ed-tech platform that empowers parents through expert-led classes, coaching, and practical tools to navigate modern parenting.

Software Engineer (Remote)

Graaho Technologies, Dhaka.

May 2022 - June 2025

Led the development of the KhaoDao Chatbot using ChatGPT, Python, DynamoDB, and AWS Lambda.
Led the development of the KhaoDao Customer Frontend, a responsive web-based food ordering platform using ReactJS.
Contributed to KhaoDao Backend development using Python, Django, SQL Alchemy, and PostgreSQL.
Led the development of the AlgoRec Frontend site, a responsive web-based platform for AlgoRec recommendation system using ReactJS.
Led the ZDSL Real Estate Project Management system development using EC2, Django, ReactJS, and PostgreSQL.
Built data pipelines and automated workflows using Python, Pandas, and Selenium.

Software Engineer (Remote)

Renforce, Sydney, Australia.

Oct 2021 – Jan 2023

Built data scraping and processing pipelines using Python, Selenium, and BeautifulSoup4.
Developed a PDF data extraction pipeline with JavaScript, OCR, and Canvas.
Created a website (Renforce Web) to automate daily tasks using ReactJS.

Jr. Software Engineer (Remote)

Graaho Technologies, Dhaka.

Feb 2020 – April 2022

Automated data processing for KhaoDao using Python, Pandas, SQL Alchemy, and PostgreSQL.
Created Selenium-based bots to automate order placement workflows.
Developed data scraping tools for Google Maps and other sources using Python and BeautifulSoup4.

Software Engineer (Remote - Contract)

Fly No Borders, Dhaka.

Oct 2019 – Jan 2020

Developed a flight fare comparison and booking engine using Python, Selenium, and BeautifulSoup4.

My Projects

Here are some of my projects

Codebase Research Agent

AI-powered agent that automatically researches GitHub repositories and answers implementation-specific questions by exploring source code.

Tech Used:Python, Django, Django REST Framework, LangGraph, LangChain, OpenAI, PostgreSQL, Ripgrep, Git

Designed and developed an autonomous codebase research agent capable of understanding and navigating unfamiliar repositories.
Built a LangGraph-based multi-step workflow for repository cloning, indexing, planning, code exploration, evaluation, and answer synthesis.
Implemented repository mapping to create lightweight codebase summaries without loading entire projects into LLM context.
Developed an iterative search-and-evaluate loop that discovers relevant symbols, extracts code chunks, and dynamically generates new research paths.
Integrated AST-based code extraction for Python files to retrieve the smallest meaningful code regions around search matches.
Implemented repository caching and metadata persistence using PostgreSQL to avoid redundant cloning and indexing operations.
Generated evidence-based technical explanations with file and line-level citations to help engineers understand complex code flows.

GitHub Demo

AskMyPDF

Full-stack RAG application that lets users upload a PDF and hold a natural-language conversation with it, with answers grounded strictly in the document and cited by page.

Tech Used:Python, Django, Django REST Framework, LangChain, OpenAI, pgvector, PostgreSQL, HuggingFace Transformers, Docker

Designed and built a full-stack RAG pipeline that extracts, chunks, and embeds PDF content into a vector database for natural-language Q&A.
Implemented a smart ingestion engine that hashes chunks via SHA-256, so re-uploaded PDFs skip re-embedding unchanged sections and reuse stored vectors, cutting API costs and latency.
Built conversational query rewriting to resolve follow-up questions into standalone retrieval queries, improving vector search accuracy on multi-turn chats.
Integrated cross-encoder reranking (HuggingFace ms-marco-MiniLM-L-6-v2) to filter and reorder retrieved chunks by true relevance before generation.
Added a token-budget guard that trims chat history dynamically to keep prompts within the LLM's context window while preserving retrieved context.
Implemented inline, page-level citations so every answer traces back to the exact PDF page it was drawn from.
Exposed all chat mutations through a Django REST Framework API layer, with real-time streaming responses and markdown-rendered answers in the UI.

GitHub

My Skills

I am skilled in backend, frontend, and AI/LLM engineering, backed by AWS-certified cloud infrastructure experience

Programming Languages

Python, JavaScript, TypeScript

Frameworks & Libraries

Django, Django REST Framework, ReactJS, NextJS, Tailwind CSS

AI & LLM

LangChain, LangGraph, OpenAI, HuggingFace Transformers, RAG Pipelines, AI Agents, Prompt Engineering

Cloud & DevOps

AWS (Lambda, EC2, DynamoDB) — AWS Solutions Architect – Associate Certified, Docker

Databases

PostgreSQL, pgvector, DynamoDB

Web Automation/Scraping

Selenium, beautifulsoup4

Version Control

Git

My Certificates

I have obtained multiple certificates in technical skills, professional development, and industry-specific areas, showcasing my dedication to continuous learning and expertise.