Chrono24 serves nine million monthly active users with a product and tech team of 130 people by focusing on core engineering principles.
Cloud computing introduces significant costs and operational complexity, especially with microservices, which can make debugging distributed systems incredibly difficult.
Three core principles—Keep It Simple Stupid (KISS), using boring/proven technology, and deeply understanding your tools—help reduce complexity and improve system reliability.
An ultra-fast in-memory caching layer using Data Access Objects (DAOs) and slices allows a single server to handle over 43,000 read requests per minute.
Cloud services are used strategically to solve specific problems, such as S3 for image storage, Lambdas for image processing, and AWS for machine learning tasks.
A bare-metal monolith offers significant cost savings and operational simplicity but suffers from a lack of flexibility and creates a single point of failure during deployments.
Technical debt is not a binary choice against feature development but an opportunity to improve the system's structure while adding new functionality.
The Strangler Fig pattern and Domain-Driven Design (DDD) are used to incrementally refactor the monolith into a modular system with clear boundaries and ownership.
Building a scalable system requires a constant fight against complexity through clear principles, a supportive culture, and automated architectural enforcement.
39:16Holly Cummins
56:49Jens Happe
57:38Bernd Ruecker
1:01:30Henning Schwentner
37:55Adam Bien
42:23Adam Bien
49:30Moritz Kammerer
59:03Florian Rappl
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