1
Making it clear when we're on a call with you to protect you from fraud
If someone calls you claiming to be from Monzo, you can now check to see if they’re telling the truth or not in the Monzo app.
Monzo Blog
Your salary sorted into Pots. Your spare change turned into savings. Your money, doing what it should with Monzo.
- Popular posts
- 9
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- #748 company
Visit monzo.com → On Hacker News Sep 2016 – Aug 2026
Security & Privacy 5Infrastructure & DevOps 5Tech Industry & Business 4Systems & Performance 3Networking & Internet 1
2
Why Monzo's bank transfers weren't working on the 30th of May
A technical problem at the company we use to connect to Faster Payments caused issues with bank transfers. To fix it, we’re bringing everything in-house instead.
3
How we protect our most sensitive secrets from the most determined attackers
As a bank, we have a lot of secrets we need to protect to keep our customers and ourselves safe. These include private keys that only we know, which we use to digitally sign requests as coming from us (sort of like a private password). These private keys are super important and are used all over Monzo and when…
4
How we secure Monzo's banking platform
Our Security Infrastructure team introduces the principles we follow to build security in Monzo’s fast-moving engineering environment and how they work with other engineering teams to keep our customers and platform safe.
5
Monzo’s Response to Cloudbleed
Your salary sorted into Pots. Your spare change turned into savings. Your money, doing what it should with Monzo.
6
Monzo: How our security team handle secrets
We recently designed a new system to manage secret information safely – from the keys that we use to sign your Mastercard transactions, to credentials for external services.
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We built network isolation for 1500 services
We've been working on isolating the 1,500 services that power Monzo. The sheer size and complexity of our platform made this difficult. But by protecting us against compromised services, it makes Monzo more secure.
8
Monzo Stand-In
Our customers reasonably expect to be able to spend on their card, make bank transfers and pay their bills 24 hours a day, 365 days a year. Their lives don’t have downtime for maintenance so nor should we. We dedicate a lot of our engineering effort to minimise the risk of downtime during technical migrations and…
9
Building a Modern Bank Backend
At Monzo, we’re building a banking system from scratch. Our systems must be available 24x7 no matter what happens, scalable to hundreds of millions of customers around the world, and very extensible. This first post in a series about our platform explains how we’re building systems to meet these demands using modern…