Backend

Wise Tech Stack (2022 edition)

An overview of our tech stack as of 2022.

Sharing Static Data Within Spend

Wise helps people who send money abroad save £1 billion a year compared to using a bank. We also help…

How Wise reduced AWS RDS maintenance downtimes from 10 minutes to 100 milliseconds

Implementing entity states as separate classes

Reducing domain model complexity by implementing entity…

The journey from “When to Mock” to “How to Mock”

The TransferWise stack, 2020 edition

Here’s how the TransferWise engine looks like under the hood, and…

Null Object and Optional

Null Object and Optional are both ways to avoid nulls. Which one is better…

More Effective Testing of Spring Microservices

Using port level tests to improve microservice…

How to avoid service-to-service calls for plain data

Java complex object mapping with JDBC

Simple pattern how to make complex JDBC mapping logic easily…