Just noticed something pretty significant happening across the banking sector right now. Banks went all-in on digital infrastructure last year, and it's not just incremental change — it's a complete infrastructure overhaul.

Here's what caught my attention: banks spent $623 billion on technology in 2024, but for the first time, more than half went to digital infrastructure instead of maintaining physical assets. We're talking cloud computing, APIs, cybersecurity, data platforms — the actual backbone of modern banking. The old playbook of running massive data centres, branch networks, and ATM fleets is basically dead.

The numbers back this up. A McKinsey survey showed 78% of bank CIOs plan to move their primary workloads to public cloud within five years. That's jumped from just 35% in 2020. The pressure is real: cost savings (Accenture estimates 40-60% infrastructure cost reductions), regulatory requirements, and the fact that there are now 3.6 billion digital banking customers to serve.

Look at what's actually changing. Capital One went all-in on AWS and shut down every single data centre back in 2020 — their tech costs have dropped every year since. HSBC announced a major cloud partnership and expects to save $300 million annually. Meanwhile, fintech platforms that grew 23% annually never had legacy data centre baggage to begin with.

But it's not just about moving to the cloud. The entire architecture of banking is going digital. Proprietary networks are being replaced by open APIs — the UK's Open Banking ecosystem now has 370+ regulated providers and 7 million active users. When someone applies for a mortgage through a broker's website, APIs handle everything: pulling account data, verifying identity, checking credit, initiating the application. No branch visit needed. That's infrastructure.

Digital identity verification is another massive shift. Used to be you needed to physically visit a branch with documents. Now? Companies using AI can verify identity documents against selfies in under 60 seconds. 85% of new bank accounts in developed markets are now opened digitally. India's Aadhaar system gave digital identity to 1.4 billion people, enabling account opening in minutes. Brazil's doing similar infrastructure plays.

Even payment systems are going digital. Real-time payment networks now operate in 70+ countries. India's UPI processed over 12 billion transactions in a single month last year. Brazil's Pix handled 42 billion for the entire year. The EU's expanding SEPA Instant to cover all eurozone banks. These systems settle in seconds instead of 1-3 business days.

What's wild is that this infrastructure shift enables 30,000 fintech companies worldwide to build on top of banking rails. The whole system is becoming software-first, cheaper to operate, faster to update, and capable of serving billions without geographic branch constraints.

This is what banks going digital actually means at scale — not just better apps, but a complete infrastructure transformation. The vault, branch, and mainframe era is over. We're fully in the API, cloud, and machine learning model era now.