BEYOND THE ALGORITHM | How Real Machine Learning Models Are Built, Tested and Put to Work

Machine learning is not magic, and if you are building, buying, or betting on AI, this is the episode that will save you from expensive mistakes.

Stephanie Onwuemenyi sits down with data scientist Emmanuel Fapojuwo-oni Temidayo to break down the real process behind machine learning, from defining the right business problem to cleaning data, engineering features, testing models, and knowing when a system is actually fit for purpose. If you have ever wondered why some banks approve loans faster, why fraud systems flag your card at the worst possible moment, or how companies predict churn before customers leave, this conversation makes the invisible visible. Emmanuel explains why many AI projects fail before they even start: teams rush to the algorithm instead of asking the right question first.You’ll discover:

• Why every successful machine learning project starts with the problem, not the model
• How data quality, missing values, outliers, and data modeling shape the outcome
• What feature engineering really means in plain English
• How training, validation, and test data protect a model from overfitting
• Why accuracy alone can be misleading, and why precision, recall, and F1 score matter
• When to trust AI, when to monitor it, and why human oversight still matters

Emmanuel also shares how a credit risk model helped reshape a company’s business approach, why machine learning systems must be retrained as customer behavior changes, and how generative AI fits into the broader AI landscape without replacing the fundamentals underneath it. He closes with practical advice for aspiring data scientists: learn the basics, stop living in tutorials, and start building with real data.

Emmanuel Fapojuwo-oni Temidayo is a data scientist with over seven years of experience in artificial intelligence, machine learning, and data modeling. He began his career as a data analyst in Nigeria, has led analytics teams, and now works in the UK, building dashboards and models that help businesses make better decisions. Essential listening if you work in data, want to understand AI beyond the hype, or need a clearer framework for turning raw information into real-world decisions.

Connect with Emmanuel:

https://www.linkedin.com/in/emmanuel-fapojuwo-oni/