Tony Joseph Sebastian| Developer

About Me

Seasoned AI & ML-focused software engineer with 6+ years of experience shipping GenAI, data, and automation platforms that modernize enterprise workflows.

Specialized in LangChain, LangGraph, Azure OpenAI, and FastAPI—designing retrieval-augmented assistants, observability frameworks, and cloud-native integrations across legal, finance, and engineering teams.

Dedicated to creating trustworthy AI solutions with strong governance, measurable business impact, and delightful user experiences.

Work Experience

Toronto-Dominion Bank

Software Engineer

Sept 2022 – Present | Toronto, Canada

Architected full-stack LLM platforms using React, FastAPI, LangChain, LangGraph, and Azure AI to automate workflows across engineering, legal, and finance partners.
Developed legacy code analytics for COBOL, SAS, and SQL that combined Azure OpenAI with LangGraph to accelerate modernization, documentation, and onboarding.
Delivered legal document intelligence using Azure AI Search and LangGraph, improving compliance review accuracy above 85% and removing manual processing loops.
Designed retrieval-augmented assistants with FAISS and LangChain to enable natural language discovery across policy repositories, cutting lookup time dramatically.
Built a data mapping assistant with LangGraph and Azure OpenAI that aligns external datasets to internal schemas, reducing manual reconciliation.
Shipped AI-driven forecasting pipelines with Azure ML, XGBoost, NeuralProphet, and Prophet that replaced spreadsheet planning and saved millions daily.
Implemented custom Model Context Protocol flows to optimize long-context reasoning, token efficiency, and multi-turn orchestration across GenAI workflows.
Automated CI/CD with GitHub Actions and Docker, integrating observability that surfaces token usage, logs, and failure details in real time.

Tech Stack: React, TypeScript, FastAPI, LangChain, LangGraph, Azure OpenAI, Azure Cognitive Search, Azure SQL, MongoDB, FAISS, Docker, GitHub Actions.

HP (via Inspirisys Solutions)

Software Engineer

June 2018 – July 2021 | Technopark, India

Delivered custom software solutions for HP scanning platforms, consistently meeting B2B milestones and client release schedules.
Engineered C++/CLI plugins to connect HP scanners with Google Drive, Dropbox, SugarSync, and Box for cloud-based document workflows.
Designed RESTful APIs powering large-scale data migrations that processed over one million records with improved reliability and scalability.
Implemented multithreaded features using OpenMP, boosting performance of compute-heavy image processing routines by 20%.
Built image-to-PDF conversion and document editing modules that elevated user experience and adoption across enterprise deployments.
Resolved 50+ high-priority defects and partnered with global teams to stabilize product quality for worldwide releases.
Led sprint ceremonies, grooming, and triage to cut bug resolution time by 25%, while producing comprehensive product documentation.
Maintained custom Windows drivers and network layers with WIA, TULIP, and MFC to streamline device-to-cloud communication.
Automated testing pipelines with Jenkins, GoogleTest, and CPPTest, reducing manual QA work by 30%.
Managed Git and SVN workflows, ensuring peer-reviewed releases aligned with customer requirements.

Projects: HP Ink Supply Station, HP Scan Plus, HP Twain Plus, HP Universal Scan, HP Scan Cloud. Tech Stack: C++, C#, .NET, WPF, OpenMP, Python, Node.js, REST APIs, WIA, AWS, Dropbox SDK, Google Drive SDK, Jenkins, GoogleTest, CPPTest, SQL, WIX.

Certifications

OCI AI Foundations

Oracle

Foundations Associate

OCI Generative AI

Oracle

Professional

Oracle AI Vector Search

Oracle

Professional

OCI Data Science

Oracle

Professional

IT Transformation: Practical Use Cases Powered by Generative AI

PwC

Issued Apr 2024

Finance Transformation: Practical Use Cases Powered by Generative AI

PwC

Issued Mar 2024

SAS Macro Language 1: Essentials

SAS

Issued Apr 2023

SAS Programming 2: Data Manipulation Techniques

SAS

Issued Apr 2023

Business Overview of SAS Solution for IFRS 17 in SAS Risk Stratum

SAS

Issued Mar 2023

SAS Programming 1: Essentials

SAS

Issued Mar 2023

Projects

MeetCode — Generative AI Code Learning App

LeetCode-style practice platform with AI-generated challenges, hints, and personalized coaching powered by LangChain.js and GPT within a React + TypeScript + Vite interface.

Repository