Since 2021 I have been working at Cheddar Payments, which is a fledgling fintech startup in the UK. It was a substantial change from WeTransfer in terms of the problem domain, but also scale. The scale at a B2C fintech is smaller, but the challenges are, in ways, much harder. And the biggest challenge - engineering-wise - is “data over time”. I’ve learned more about data over time than I would like, and it can be useful to share my experience.| Julik Tarkhanov