About David Ndungu

I'm a software engineer with 20+ years building production systems, the last 8 of them as a Staff/Senior engineer at Zendesk. I ran my own development consultancy for the better part of a decade before that. Today I build AI agent infrastructure and sell done-for-you AI automations to small businesses through Sire.

What I actually build

I don't just prompt models — I build the infrastructure underneath them. That includes Zerfoo, a from-scratch ML inference engine in pure Go that runs 40+ transformer architectures and decodes faster than Ollama on comparable hardware, and the durable-workflow engine behind Sire, which lets AI agents run as crash-recoverable workflows with a human approval gate on every customer-facing step.

What I do for clients

Through the Sire Founding Pilot, I audit one repeated manual workflow in your business, then build 1-2 real automations for it in 5 business days — connected to your actual tools, with a human sign-off gate so nothing fires without your approval. See the engineering behind it for the open-source proof.

At Zendesk

Eight years across Staff and Senior engineering roles, with org-wide influence: I drove gRPC adoption, shipped inbound email authentication via ARC, led a zero-downtime etcd v2→v3 migration across every production Kubernetes cluster, and worked diagnostics touching the majority of production services.

Get in touch

The fastest way to reach me is the free automation audit call, or see the contact page for phone, email, and GitHub.