Browse past weeks of engineering reads.
Building a social discovery system that efficiently surfaces Reels watched and reacted to by friends while scaling to billions of users.
When DENIC published invalid DNSSEC signatures for the .de TLD, DNS resolvers like 1.1.1.1 faced a critical decision: reject all .de domain queries due to signature validation failures or serve potentially stale cached responses to maintain availability.
Query performance degradation at massive scale (10+ trillion rows, 15M events/second) where repeated identical queries were consuming excessive resources and impacting latency.
Third-party feature flag services introduce unacceptable latency for applications requiring sub-millisecond flag evaluation at global scale.
AI crawlers were ingesting deprecated and non-canonical content despite soft directives like robots.txt, requiring a way to enforce canonical versions without modifying origin infrastructure.
Web pages are growing larger and slower to load due to increased dynamic content, requiring better compression techniques that can adapt to modern agentic web patterns.
Building a scalable multi-tenant configuration service that maintains strict tenant isolation while supporting real-time updates without cache staleness or downtime.
CDN cache systems were designed for human traffic patterns but struggle with the distinct access patterns of AI bot traffic, which now represents over 10 billion requests per week and threatens cache efficiency.
LinkedIn Sales Navigator's search pipeline had latency issues as query complexity and data volume grew.
Cloudflare needed to significantly increase edge compute throughput per server but faced a tradeoff where high-core-count CPUs came with smaller per-core L3 cache, risking latency penalties for cache-dependent workloads.