• Lead technical engagements with enterprise API customers, typically AI native enterprises; act as the primary engineering counterpart. • Translate customer requirements into product and infrastructure improvements; contribute code directly to core API services and custom point solutions. • Work on systems that scale to thousands of queries per second, where each millisecond of latency matters • Partner with product and research teams to ship improvements driven by real production usage. • Implement and integrate our APIs into customer production systems. • Design and run joint API evaluation frameworks with customers; analyze results and drive measurable improvements during and after the evaluation process. • Diagnose integration, retrieval, ranking, and evaluation issues in customer environments and resolve them hands-on. • Support technical aspects of enterprise sales cycles: architecture reviews, POCs, benchmarks, and performance validation..