ThomasBreindl

• Shipped a compaction path for an analytics pipeline at 100M events/s that merges aggregates during downstream outages, raising retention from 51% to 77% in controlled outage tests
• Built a reproducible fault-injection harness for the full pipeline in Docker that compares retention, CPU, memory, and throughput with compaction on and off before rollout
• Wrote a Cloudflare Workers reference integration and Grafana dashboard for the pipeline, now the team's canonical implementation and onboarding example

Jul - Sep 2026

• Rewrote ~31K LOC of legacy COBOL health-insurance logic in Java/Quarkus, moving batch flows to chunk-oriented Jakarta Batch and cutting code size by 40%
• Built an annotation-driven Java library that maps binary COBOL copybook records to typed Java objects, replacing hand-written parsing code across the codebase
• Designed an ID allocation scheme that reserves blocks from database sequences, so parallel batch workers never contend on per-record sequence access

Mar - Jul 2025Oct 2025 - Jun 2026

• Moved non-critical provider calls off the request path onto ActiveMQ/JMS, cutting production P95 initial response latency by 50% to ~150ms in a system handling 1.5M events/day
• Added Prometheus metrics and Grafana dashboards for async latency, failures, and per-provider performance

Aug - Sep 2025

• Built an internal idea database with SAP Fiori Elements to streamline proposal and workflow management
• Developed a Java tool for SAP Sales Cloud exporting HTML records to Excel, validating >5K bulk edits per second before applying

Jul - Aug 2024