abyo software LLC is an independent software company in Japan building high-performance data infrastructure and security tools in Rust. Our S4 family helps AWS teams cut costs and ship faster: S4, an S3-compatible storage gateway with transparent compression; S4 Logs, a CloudWatch Logs-to-S3 archiver that cuts log storage costs; and S4 LogForge, a SIEM test-data generator producing realistic, parser-verified logs in 13 formats for PoCs, detection engineering, and load testing. Every product is backed by rigorous testing, continuous fuzzing, and lock-in-free design.