---
title: Mario-César Señoranis | Senior Software Engineer
description: Senior Software Engineer and Technical Lead with 9+ years building fullstack platforms in fintech, SaaS, and e-commerce using Python, Django, React, Node.js, AWS, and AI integrations.
---

# 👋🏼 Hello, I'm Mario-César Señoranis!

I'm a Senior Software Engineer and Technical Lead based in Bolivia, with 9+ years of experience building fullstack platforms across fintech, SaaS, and e-commerce. I write, build, and share what I learn.

My stack centers on **Python, Django, FastAPI, React, Next.js, and Node.js**, deployed on **AWS** (Lambda, EC2, RDS, Fargate, S3) with **Docker, Kubernetes, and Terraform**. I've led engineering teams, scaled platforms handling millions of transactions, and built AI integrations on top of **OpenAI** and **Claude** for systems with high data volume.

I've shipped production work at [Zapier](https://zapier.com), [Tesorio](https://tesorio.com), and [tuGerente](https://tugerente.com/), focused on app connectors, API integrations, ETL pipelines, real-time dashboards, and the kind of legacy-system upgrades that move a business forward. I care about clean ownership of the code, working well with a team, and shipping solid, maintainable solutions.

If you'd like to talk about an opportunity, a project, or just trade notes, reach out on [LinkedIn](https://www.linkedin.com/in/mariocesar).

Welcome to my corner of the internet.

You can also find me:

- 🧑🏽‍💻 Discussing work on [LinkedIn](https://linkedin.com/in/mariocesar)
- 📸 Sharing photos on [Instagram](https://instagram.com/mariocesar_xyz)
- ⌨️ Sharing code and projects on [github.com/mariocesar](https://github.com/mariocesar), including this website's code on [github.com/mariocesar/mariocesar](https://github.com/mariocesar/mariocesar).
  - 🗒 Posting helpful code snippets on [Gist](https://gist.github.com/mariocesar).

Thank you for visiting. I hope you find something useful.

*[LatAm]: Latin America
*[SMB]: Small and medium-sized businesses