Flux-Gateway

Overview

Flux-Gateway is a high-performance API Gateway and Reverse Proxy built in Go from scratch to safeguard downstream microservices from traffic spikes and cascading network partitions.

Engineering Highlights

• Engineered an in-memory, thread-safe Circuit Breaker using Go sync.RWMutex primitives.
• Reduced failed-request latency from a 2000ms TCP connection timeout to less than 0.4 milliseconds through automated fail-fast edge boundaries.
• Built a low-latency traffic-policing tier using atomic Redis Lua script execution to prevent race conditions across multi-node scaling contexts.
• Validated the traffic-policing layer under a simulated load of 14,200 requests per second.
• Integrated concurrent background health probers using context.Context timeout handles to actively evaluate upstream cluster degradation.
• Implemented automated circuit-state transitions based on upstream health.
• Added a decoupled telemetry interface at :8090/metrics.
• Exported Prometheus RED metrics for application observability and p95/p99 latency analysis.
• Practiced table-driven TDD alongside the native Go race detector.
• Used Miniredis in-memory mocks for deterministic Redis testing.
• Established a GitHub Actions quality gate requiring a minimum of 70% code coverage.

Engineering Focus

Reliability · Concurrency · Fault Tolerance · Traffic Control · Observability · Testing