Harry Osmar Sitohang
Senior Principal Engineer · Architecture & platform
Harry is a Senior Principal Engineer with roughly a decade in the IT industry, working across Go, Java, .NET Core, Node.js and PHP. He owns the hardest production calls — how a system is shaped, how services are orchestrated, and the code that has to hold once real traffic and real money are on it.
His core focus is microservices architecture built for scalability, resilience and maintainability, backed by DevOps and CI/CD automation and the monitoring, alerting and observability that keep it honest in production — Kubernetes, Istio, Kafka, Prometheus, Grafana and the ELK stack across AWS, GCP and Aliyun.
He has run software at government scale on Prakerja — systems serving on the order of 100 million users and tens of millions of transactions — and earlier led engineering at Wayfair and OLX. He brings that judgement, plus technical mentoring and team leadership, to every engagement: what to build, what to cut, and what will still be standing in two years.