Clelia Astra Bertelli

Open Source Engineer @ LlamaIndex

About Me

I’m Clelia, a software engineer with a passion for open source, AI and python.

I am goal-driven, ambitious, and always on the look for the next challenge.

Building is my passion: I love creating useful automation in my day-to-day life, as well as I dive more than happily into weekend projects!

I also love writing, tackling both technical and scientific topics for the sake of open science (I had my BSc. in Biology!)

My Top 5 Projects

NotebookLlaMa

GitHub Repository

An OSS, LlamaCloud-backed clone of NotebookLM

NotebookLlaMa brings intelligent automation to your everyday document processing workflows

PdfItDown

GitHub Repository

Convert (almost) any file to PDF!

PdfItDown is a python package and CLI tool to convert most file formats into PDF for GenAI application!

ingest-anything

GitHub Repository

Connect your data sources to a vector database, one-click.

ingest-anything is a python package that automates the building of RAG pipelines by performing all the steps between you and having your files into a vector database!

LlamaResearcher

GitHub Repository

Deep-research the web with the power of Llama-4

LlamaResearcher researches the depth of the web and produces essays on a given topic. Powered by LlamaIndex, Groq, Gradio and LinkUp.

coding-cli

Website

CLI assistant for coding tasks

coding-cli is a Typescript package that allows you to understand, modify and debug you code with the assistance of AI.

Experience

LlamaIndex

Open Source Engineer

May 2025 - present

https://llamaindex.ai

Automating document workflows with AI

I am one of the maintainers of LlamaIndex OSS framework, both for Python and Typescript. I also contribute to other LlamaIndex-managed packages and build projects related to our open-source and cloud products.

LegalForLandlords

AI Engineer

February 2025 - May 2025

https://lfl.co.uk

Automating legal documents understanding with AI

I contributed to build a pipeline for processing legal documents using AI agents orchestration.

Natural History Museum Vienna

Bioinformatics Researcher

October 2024 - March 2025

https://www.nhm.at

Insect genomics and biostatistics.

In my six-months fellowship, I researched human-driven impact on the genetic differentiation of fruit flies in Europe using quantitative genome data.

Criad Ltd

Founding Engineer

June 2024 - February 2025

Building the next space for designers and architects, using AI

I was involved in the first phases of development and iteration over a product that would represent a new, AI-powered space for A&D.

Education

University of Pavia

BSc. Biological Sciences

2022-2025

Biological Sciences program with a focus on Genetics and Bioinformatics

As a Biology undergraduate student, I followed courses about Genetics, Physiology, Evolution, Ecology and (Bio)chemistry. My focus has been, throughout my Bachelor’s degree, mostly on Bioinformatics. My dissertation was titled: “Exploring Potential Commensality Patterns between Drosophila melanogaster and Homo sapiens in Europe” and was supervised by doct. Lino Ometto (University of Pavia) and doct. Martin Kapun (NHM Vienna).

A Little More About Me

My skills, beyond being a python developer, AI (from RAG to agents), encompass DevOps (especially with Docker), git and GitHub, TypeScript, Astro… and I would really love to keep learning Go and start learning Rust.

I am a passionate person: I try to do my best whenever I can. I value solo work, but I discovered that I value work more when it is a team effort, and many people contribute to iterate and build something wonderful!

Beyond my technical skills, indeed, I spent a lot of time focusing on building good soft skills, such as speaking in public and pitching ideas or story-telling them through reports or presentations, as well as cultivating transparent communication.

My interests, beyond programming, are travel, art (and museums!), my cat and sports (although I generally prefer the gym).