Alex Molas Blog

Jev is a useful zero-shot classifier, but its probabilities can't be calibrated for your data.

Introduction Over the last few months at RevenueCat I’ve been building a statistical framework to flag when an A/B test has reached statistical significance.

How I added fast, client‑side search to this site with Lunr.js and a build-time index.

Lately I’ve heard a lot of stories of AI accidentally deleting entire codebases or wiping production databases.

Left Wallapop a couple of weeks ago, heading to RevenueCat soon.

I like problems that are easy to pose, and that seem difficult to solve at first glance, but that a slight change of perspective makes them simple and easy to solve.

I’ve been using LLM-assisted coding for the last couple of months, and it has been a game-changer.

I’ve never been good at playing football 1.

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For the last weeks at Wallapop, we have been interviewing candidates for a Data Scientist position.

The other day I was interviewing a developer for a position at Wallapop.

Explore the critical considerations and potential pitfalls of relying solely on A/B testing in making business decisions.

h-index for HackerNews

In this post I explain how I built a search engine from scratch using python.

Here I explore a doubt I've had for the last 15 years.

Insights and tips for a smooth transition when starting a new job

I hate MFA, and in this rant post I explain why.

This insightful exploration draws parallels between mathematical formulations and practical implementations, showcasing how understanding conditioning as grouping can elevate your statistical insights.

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Discover the surprising wisdom in embracing 'dumbness.'

Understand the different types of means and when to use them.

In this post I derive the physics of pumping a swing and the physics of jumping from a swing.

In this short note I compare Bilalic and Blom approximations to compute the k-th order statistics from a gaussian distribution.

Does it exist a gender gap in chess?

In this text, I study the idea that science needs engineering as much as engineering needs science.

In this text I use math to show that you have a rare skill combination, that makes you the best at something.

In this post I explain how I built my automatic blogroll using Github Action and Github Pages.

Quick blog update.

Nobody cares about your blog, but you should keep writing!

Discover the reasons behind the transformation of my blog and the benefits it brings.

Since last October, I’ve been playing in a simple game all by myself, with just one rule - I have to spot all the license plates from 0000 to 9999 in sequential order.

In our modern era, we have witnessed a remarkable shift in the way we approach computation.

Investing your money wisely is crucial for financial success.

Are you sick of having to choose which political party to vote for when none of them represents your beliefs 100%?

Learn how initializing the correct bias in your neural network can speed up training process through analytical derivation and experiments.

The uncertainty of a measure is a statistical process.

In this post, I show how can we leverage the extra information we get from knowing that a car has survived a certain amount of time.

In this post I analyze all the available Chess960 games played in Lichess.

Today I’m going to write about the most typical topic of the last days of the year: New Year’s resolutions.

Random Forest can't overfit.

In this short post I show a position where's possible to mate using only pawns.

During my current incursion in computability theory I learnt about uncomputable numbers, this is, numbers that can’t be computed with arbitrary precision.

During these last few days I’ve been reading a little bit about computability theory, and I feel like a kid with a new toy, so I’m going to write some posts about this topic.

A game where you have to choose the smallest number that nobody has chosen yet.

How does python optimize constant expressions.

How to interpret L1 regularization using a Bayesian approach.

A review of my first -and for the moment the only- paper published in a top journal.