Hi 👋, I'm Julián Perelli.

I build and run web systems. Agents write the code now; I do everything around it.

Principal Software Engineer at BetOnline: a team of eight, millions of events per hour, about a million users. Individual contributor. My day is wiring systems together, getting data out of places not built to share it, unblocking people, and explaining the system to whoever has to decide.

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16 yearsweb, frontend, backend, databases, mobile

12 yearsremote, with teams in the US, Germany and Spain

~1M userson the platform I work on today

~5,000 / dayusing cualbondi, my hobby project since 2009

400+ starsacross three open-source tools I maintain

4 yearsteaching at university

How I work

Integration, with AI where it helps

The platform talks to dozens of internal and external services. I connect them; some of that is AI steps, security checks and incident automations that replaced manual work.

Unblocking

An access nobody grants, a vendor that does not answer, a process with no owner. Often my job is finding the person or the workaround.

Explaining systems

When something is a black box I draw it or trace one request end to end, then lay out the options so management can decide.

Some results

Builds 15 to 5 minutes. Feedback loop 10 minutes to 10 seconds. TypeScript coverage 20% to 80%. All at BetOnline, with the team.

Where I have worked

2023 · now

Principal Software Engineer · BetOnline

Online gaming · FoshTech subsidiary · remote

Microservices that match millions of bet, deposit and click events per hour and trigger customer bonuses. I sit between the architects, the product owner and 8+ engineers.

TypeScript · Node.js · NestJS · MongoDB · Next.js · Svelte · Web Components · Vite · Jest · k6 · Kubernetes · ArgoCD · Jenkins
2016 · 2023
GoAlto · seven years, four roles

Consultancy and HR scale-up · remote, team in San Mateo, CA
1. 2019 · 2023
  
  Chief Technology Officer
  
  remote from Spain
  
  Product architecture and hands-on development with a small team. AWS, then Vercel. PostgreSQL.
2. 2018 · 2019
  
  Software Architect, for Mosaique
  
  remote from Spain
  
  Fintech start-up in Chicago. Django, Celery and React platform built from scratch on AWS Fargate.
3. 2017 · 2018
  
  Frontend Engineer, for Matterport
  
  remote from Argentina
  
  3D spatial mapping, Sunnyvale. AngularJS and Django; migrated a 1000+ file frontend from grunt to webpack.
4. 2016 · 2017
  
  Senior Lead Software Engineer, for Celerative
  
  Consultancy in La Plata. Client projects on AWS, React, React Native, Vue and AngularJS.
2015 · 2017

Fullstack Engineer · mainstorconcept

remote from Argentina, part time · Mainframe services · team in Ettlingen, Germany

Web application for a mainframe tape-emulation system. Django REST API, AngularJS.
2012 · 2015

Assistant Professor · UTN / Software & Security Engineer · Ministry of Health

La Plata, Argentina · part time

Taught Programming Paradigms and Operating Systems. At the Ministry: pentesting, security policies, and a central patient-information service.
2005 · 2011

Information Systems Engineer · UTN

La Plata, Argentina · GPA 9.2 / 10 · six-month research scholarship at KIT, Karlsruhe