Before NúmerosDon, I worked as a Senior Data Analyst at SIS in a rapidly scaling trading function. The department was growing fast and operating under extreme time pressure — every analytical decision had immediate financial consequences.

I independently led the expansion of the team’s analytical capability. That meant building the infrastructure from scratch: a centralised database replacing fragmented spreadsheets, statistical models tuned for in-play trading during high-volatility live events, and executive dashboards that turned complex datasets into decisions across multiple organisational levels.

Eventually the role outgrew one person. I trained up and mentored junior analysts to take over the recurring work — which freed me to focus on the harder modelling problems and the cross-team conversations that turned analytics into decisions the business could actually act on.

It was the environment that shaped how I build systems now — under pressure, with real stakes, where being wrong costs money immediately.