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All Things P99

The event for developers who care about P99 percentiles and high-performance, low-latency applications

Taming the Tail: Engineering Predictable Latency in Serverless Event Processing

Serverless platforms scale beautifully until they don’t. In event-driven architectures, unpredictable P99 latencies often emerge from cold starts, retries, uneven shard processing, or misconfigured concurrency controls. These “long tail” latency spikes can go unnoticed in dashboards but wreak havoc on end-user experience and downstream systems.

In this talk, I’ll share engineering strategies we’ve used to tame tail latencies in large-scale serverless event pipelines. We’ll look at techniques like shuffle sharding to reduce noisy-neighbor effects, adaptive token management to avoid timeouts during AI inference, and observability patterns that help catch latency cliffs before they hit production.

Expect practical code-level takeaways and architecture patterns designed to bring performance predictability to inherently bursty, decoupled systems. Whether you’re building real-time data pipelines or transactional event workflows, this talk will equip you to chase—and tame—those elusive P99s.

20 minutes

Amit Anand, Staff Engineer at PayPal Inc

Experienced software developer and architect with a diverse background across multiple domains, including fintech, enterprise systems management, virtualization, investment banking, and databases. I have had the privilege of working at renowned companies such as Goldman Sachs, Dell-EMC, and PayPal. I have a passion for problem-solving and thrive in designing robust, distributed, and scalable enterprise solutions that meet the complex needs of modern businesses. My expertise lies in crafting innovative systems that optimize performance, reliability, and efficiency, making a significant impact on both the technical and business aspects of the organizations I work with.

Jubin Soni, Senior Software Engineer at Yahoo

Computer scientist with 14 years of experience, Jubin is a Senior Software Engineer at Yahoo Finance, where he leads Data Infrastructure and Platforms team. Author of the upcoming Manning book AI-Native Infrastructure, and speaker at conferences including P99 Conf and API Days. Jubin has deep expertise in AI, distributed systems and cloud-native architectures, he focuses on building resilient platforms for real-time and big data processing. Jubin has authored and peer reviewed technical papers such as IEEE, served on jury panels for technology awards, and shares his insights through industry publications. He is passionate about advancing the state of big data and event-driven systems.

Rajesh Kumar Pandey, Principal Engineer at Amazon

Rajesh Kumar Pandey is a Principal Engineer at AWS, designing resilient, large-scale serverless architectures for event-driven and AI-powered workloads. With over a decade of experience in distributed systems and cloud performance engineering, he focuses on minimizing tail latencies, scaling async event pipelines, and improving cost-performance tradeoffs in production systems. Rajesh shares practical insights in his newsletter, Cold Starts, and has authored several publications on serverless reliability and performance tuning.

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P99 CONF OCT. 21 + 22, 2026

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