Senior API Platform Architect – Inference Systems

Callosum Technologies Ltd. in London seeks the most senior API platform engineer to own the architecture and the technical bar for our customer-facing workflows.

You’ll build and orchestrate the API surface, route requests, scale to millions of concurrent calls, and keep each customer’s data isolated. This build role is leadership-forward: you’ll set foundations, grow a small platform team, and shape reliability across the stack while writing core systems yourself for a period.

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