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Software Engineer · Mumbai

Rexon Pambujya

I build AI systems and web applications that hold up in production.

  • 3+

    Years of experience

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About

Passion fuels Purpose

Rexon Pambujya, Software Engineer
Based in
Mumbai, India
Experience
3+ years

A passionate Software Engineer based in Mumbai with strong skills in Python, Data Science, Machine Learning and Web Development.

With hands-on experience at Blitzar Tech, XEMI, and Cere Labs, I've delivered real-world impact — fine-tuning AI models to improve prediction accuracy, building intelligent chatbots that cut customer response time, and streamlining web applications for faster deployments.

I love blending technology and innovation to solve business problems, whether that's creating machine learning models, automating processes, or enhancing user experiences.

Where I've worked

Experience

  1. Associate Software Engineer

    atBlitzar Tech Pvt Ltd.Current

    Feb 2024 – Present/Mumbai

    Modernised the salary processing system for BMC schools, replacing manual file-based processes with an online system.

    • Built backend services using Python, integrating REST APIs for seamless data processing.
    • Developed several frontend modules using React.js, Next.js, HTML and CSS to enhance navigation and user experience.
    • Significantly improved efficiency and accuracy in salary disbursement for BMC schools.
    • Python
    • REST APIs
    • React
    • Next.js
    • HTML
    • CSS

  2. Software Engineering Intern

    atXEMI

    Oct 2023 – Jan 2024/Mumbai

    HSN Recommender System and EwayBill Module.

    • Prepared training data for the machine learning model by annotating essential attributes across 250+ documents, then fine-tuned OpenAI's GPT-3.5 on the HSN dataset.
    • Trained a model on HSN documents using the LangChain framework, improving HSN code prediction accuracy and streamlining code assignment.
    • Created an EwayBill module in HTML, CSS and Angular to automate filling out E-waybill forms, reducing manual workload.
    • OpenAI GPT-3.5
    • LangChain
    • Angular
    • HTML
    • CSS

  3. Data Science Intern

    atCere Labs

    Jul 2022 – Jul 2023/Mumbai

    Clustering of Indian addresses to derive business insights.

    • Analysed and processed Indian address data, transformed it into a structured format, assigned precise geo-coordinates and clustered locations.
    • Demonstrated that clustering geographic coordinates could meaningfully reduce transportation costs and improve delivery times.
    • Python
    • Clustering
    • Geospatial Data

Background

Education

  • Aug 2019 – Jul 2023

    B.E. Information Technology

    St. Francis Institute of Technology

    Mumbai, India

  • Aug 2017 – May 2019

    Higher Secondary Certificate (12th)

    Thomas Baptista Junior College

    Vasai, India

  • Jun 2005 – Jun 2017

    Secondary School Certificate (10th)

    St. Anthony's Convent High School

    Vasai, India

What I work with

Skills

Languages & Data

  • Python
  • SQL
  • MySQL

Generative AI & Agents

  • LangChain
  • LangGraph
  • LangSmith
  • OpenAI APIs
  • RAG Pipelines
  • AI Agents
  • Tool Calling
  • Prompt Engineering
  • Embeddings
  • Hugging Face
  • n8n

Machine Learning & Data Science

  • PyTorch
  • TensorFlow
  • Keras
  • scikit-learn
  • NumPy
  • Pandas
  • PySpark
  • Predictive Modelling
  • Forecasting
  • Clustering
  • RapidMiner

Backend, Cloud & Delivery

  • Flask
  • Django
  • Streamlit
  • Docker
  • AWS (EC2, S3)
  • CI/CD
  • Git
  • GitHub
  • Selenium

Web & Frontend

  • JavaScript
  • React
  • Next.js
  • Angular
  • HTML5
  • CSS3
  • Tailwind CSS
  • Material UI
  • WordPress

Foundations

  • Data Structures
  • Mathematics & Statistics
  • Data Modelling
  • End-to-End Data Pipelines
  • AI Workflows
  • Automation
  • Observability
  • Agile

Ways of working

  • Problem-Solving
  • Communication
  • Teamwork
  • Leadership
  • Project Management
  • Attention to Detail

Selected work

Things I've built

All projects
FAQ Chatbot using RAG screenshot

FAQ Chatbot using RAG

A web-based chatbot using Retrieval Augmented Generation with chat history as context, giving accurate answers to frequently asked customer questions.

  • Gen AI
  • RAG
  • LangChain
  • LLM
  • Python
Diabetes Prediction & Classification screenshot

Diabetes Prediction & Classification

A machine learning web app built with Streamlit that predicts the onset of diabetes from diagnostic measures.

  • Machine Learning
  • Data Science
  • scikit-learn
  • Streamlit
Online Service Management System screenshot

Online Service Management System

A platform for customers to get electrical equipment repaired, and for technicians to find repair jobs.

  • Full Stack
Events Management screenshot

Events Management

A full-stack app showcasing CRUD operations with MongoDB and React — improved backend data handling and database interactions behind a dynamic frontend.

  • React
  • MongoDB
  • Express
Foodie Community Platform screenshot

Foodie Community Platform

An engaging, interactive platform built with Next.js and React where food enthusiasts share favourite recipes, discover new dishes, and connect with other food lovers.

  • Next.js
  • React
OTP Login System screenshot

OTP Login System

An OTP-based login system in Java and Swing that generates a one-time password by hashing the current timestamp with SHA-256 and delivers it over Gmail SMTP.

  • Java
  • Swing
  • SHA-256
  • SMTP

Swipe for more →

Say hello

Have something you'd like to build?

I'm open to new roles and interesting problems. The fastest way to reach me is email — I read everything.

Start a conversation
rexonpambujya2001@gmail.com