System Design Walkthroughs
Deep dives into architecture decisions, technical tradeoffs, and lessons learned from building production systems.
How I built a hybrid regex + on-device LLM scanner that blocks prompts containing PII before they reach cloud APIs — zero data leaves the device.
How I achieved 50% lower latency and 40% higher throughput on a critical FastAPI service through async pipelines, SQL optimization, and strategic caching.
How I designed a plugin-based rule engine that automated credit decisions, reduced manual review by 30%, and made rule changes deployable in hours instead of sprints.