Experienced Go architect (15 years; Zalando, StreamElements). I untangle fragile microservice architectures and make them boring again.
I’ve modernized fragmented microservices for hyper-growth companies, migrated Riak → Postgres under hard deadlines, and turned chaotic legacy systems into stable, scalable platforms.
Recent impact
Overhauled business-critical messaging systems for high-volume, low-latency workloads. Simplified/retired 11+ microservices, reduced latency, and improved observability — enabling a hyper-growth partner launch ahead of competitors.
Led discovery, design, and delivery of an auditable, multi-source, high-throughput inventory tracker — giving an e-commerce client immediate stability and a scalable foundation for years of growth.
Migrated an auth database from Riak → Postgres under a hard deadline (World Cup traffic). Zero downtime and smooth scaling through peak load.
Ideal clients
Berlin/EU scale-ups with distributed systems complexity — fragile microservices, data-intensive platforms, or legacy architecture that's become a liability.
€100+/hr retainer. Fixed-bid projects also considered. Available now for 3–6 months.
The usual stack
Go, Postgres, Kafka/NATS, Kubernetes, AWS/GCP
Get in touch
Email: barry@barryhennessy.com
Portfolio/CV: barryhennessy.com
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