Hello, I’m Avishek.

Avishek Saha here. I’m an Applied AI & ML Engineer based in Canada.

These days, I work as a Data & Applied AI Analyst at BC Rapid Transit Company, building applied AI evaluation, predictive models, and data foundations for enterprise decision support.

Most of my work sits between machine learning and the software around it: source-grounded LLM workflows, useful predictions, careful evaluation, and people in the loop. This site is where I share what I build and what I learn along the way.

You can find my code on GitHub, connect on LinkedIn, or follow me on X (@avisheksaha_).

Start here

• Tokenizer From Scratch — an interactive introduction to byte-level BPE.
• LLM Engineering From Scratch — building an understanding from first principles.
• Maintenance-Eye — a multimodal maintenance copilot with guarded tools and human approval.
• My experience — the work behind the projects.

What this site is

A collection of practical work, engineering notes, and the ideas I want to keep exploring:

• Applied AI, retrieval, and evaluation.
• Predictive machine learning and the data systems behind it.
• Software that makes models useful, inspectable, and dependable.

Start with my writing, browse all projects, or visit Books & Resources.

Selected projects

• Maintenance-Eye — Multimodal maintenance copilot with live camera and voice input, nine guarded tool workflows, a FastAPI and WebSocket backend, human approval, cloud packaging, and automated tests.
• GovIntel — Procurement intelligence system combining asynchronous ingestion, PostgreSQL, hybrid retrieval, reranking, SQL analytics, structured outputs, and fail-closed citation validation.

Experience

My experience spans transit, financial technology, public-sector research, and client-facing software delivery.

• BC Rapid Transit Company — Data & Applied AI Analyst (2024 · Present).
• Brain Station 23 — Data Scientist, Applied AI (2023 · 2024).
• UBC MDS × Statistics Canada — Capstone Data Scientist (2023).
• Softology IT — Co-Founder / Data Scientist (2021 · 2022).

I hold a Master of Data Science from the University of British Columbia and a BSc in Computer Science & Engineering from American International University-Bangladesh. Read my full experience profile.

Get in touch

Working on an interesting AI or ML problem? Email me or connect on LinkedIn or X (@avisheksaha_).