Two decades of regulated software: international banking delivery, a licensed EU neobank, and now Swiss energy billing. The through-line is environments where a defect has a cost measured in regulation and reputation rather than uptime percentage, and where the interesting engineering constraints come from law and money instead of load.
N26 covers payments architecture and financial crime at European scale, in Engineering at N26 and Rebuilding Fraud Prevention. Stop Complaining About Code Freezes is the delivery-side counterpart: what continuous deployment actually costs inside a bank. Early GFT and IBM built the foundation; the later GFT stint turned it into architecture leadership across countries.
The same correctness bar now applies in a different domain — see Energy Tech. For the streaming mechanics underneath the N26 work, see Stream Processing and Fraud Prevention.