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Lehar Jain

@leharjain

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I build low-latency distributed data platforms and real-time streaming systems at scale.

India

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At Uber, I improve Flink-based real-time pipelines processing 30M trips and 10M workflows daily, and I resolved a production state leak growing checkpoint state by 30 GB per day. I also built a YAML-driven end-to-end testing framework for Flink jobs using Kafka topics.

Previously, I built D.E. Shaw's sub-second portfolio and risk analytics platform and led two engineers end-to-end. At Media.net, I led core Kafka data-platform components, built Pluto to reduce event-data size, and created Raven and Mantis for schema automation and data lineage.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Uber

Apr 2026 - Present (5 months)

Owned and improved Flink-based real-time pipelines processing approximately 30M trips/day and 10M workflows/day, with peak traffic of ~1.2K trips/sec. Diagnosed and resolved a state leak in a production Flink application, and designed a YAML-driven end-to-end testing framework for Flink jobs.

Apache Flink Kafka Java Real time processing Distributed Systems Testing Frameworks YAML Data Pipelines

Lead Tech

D.E. Shaw

Oct 2023 - Apr 2026 (2 years 6 months)

Built and evolved a real-time portfolio and risk analytics platform from the ground up, replacing a request-response system with an event-driven, sub-second architecture. Developed a delta-based propagation model and led a team of 2 engineers owning the product end-to-end.

Real time processing Event Driven Architecture Backend Engineering Java Distributed Systems Technical Leadership Mentorship Project Planning

Associate Tech Lead

Media.net

Jul 2017 - Oct 2023 (6 years 3 months)

Led engineering execution and became primary maintainer of core components of the data platform, supporting high-volume Kafka-based data flows across ~20 engineering teams. Implemented Pluto, an internal binary data format, and designed Raven, a schema registry and data pipeline automation platform used by ~500 engineers. Started development of Mantis, a metadata and lineage platform.