👋🏼 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, Tesorio, and tuGerente, 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.

Welcome to my corner of the internet.

You can also find me:

• 🧑🏽‍💻 Discussing work on LinkedIn
• 📸 Sharing photos on Instagram
• ⌨️ Sharing code and projects on github.com/mariocesar, including this website's code on github.com/mariocesar/mariocesar.
  • 🗒 Posting helpful code snippets on Gist.

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