Christian Johnson

I’m a Senior Software Engineer with 10+ years of experience architecting scalable backend systems, designing RESTful APIs, and integrating third-party financial services. I focus on building reliable, testable distributed systems that perform under real-world load—at consumer fintech and payments scale.

At DwareApps, I architected and deployed a modular microservices orchestration layer processing 500+ transactions per second, cutting partner onboarding time by 40%. I built an event-driven payment reconciliation system on AWS Kinesis and SQS (2M+ daily events) and delivered a dual-write cache invalidation strategy that reduced API p95 latency from 850ms to 120ms.

I also lead migrations and modernization efforts with measurable outcomes—moving a legacy monolith billing service to a CQRS-based event-sourced architecture, cutting billing reconciliation time from 4 hours to 12 minutes per cycle. I’ve engineered real-time fraud scoring achieving 98% detection accuracy and reducing chargebacks by 25% in the first quarter.

Earlier roles strengthened my breadth across data and platform engineering: building high-throughput ingestion with Kafka and Apache Flink (10M+ events daily), designing multi-region AWS deployments with 99.995% uptime SLA, and delivering secure, PCI-compliant payment services. I’m at my best shipping safely with strong testing, observability, and disciplined architecture—often mentoring teams and raising engineering standards.