stream-processing
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DeltaStream
DeltaStream is a Menlo Park-based company building a unified, serverless stream processing platform on top of Apache Flink. Founded in 2021 by Hojjat Jafarpour, the creator of ksqlDB, it lets teams build real-time streaming applications and pipelines using SQL - without wrestling with Flink's operational complexity. Its Fusion platform combines streaming, real-time, and batch analytics into a single serverless experience, integrating with Kafka, Kinesis, Snowflake, Databricks, and Apache Iceberg. The company has raised $25M total, backed by NEA, Galaxy Interactive, and Sanabil.
RisingWave
RisingWave is a distributed SQL streaming database that lets developers ingest, transform, and serve real-time data using familiar PostgreSQL-compatible SQL instead of specialized stream-processing frameworks. Founded in 2021 by former AWS Redshift engineer Yingjun Wu, the San Francisco company decouples compute from storage in a cloud-native architecture, offers incremental materialized views, and integrates natively with Apache Iceberg to power a streaming lakehouse. Its open-source engine and managed RisingWave Cloud target fraud detection, monitoring, real-time analytics, and increasingly the data infrastructure behind agentic AI.
Pathway
Pathway builds infrastructure for live AI - systems that think and learn in real time instead of being frozen at training. Its source-available Python framework powers high-throughput, low-latency ETL, stream processing, real-time analytics, and RAG/LLM pipelines that stay continuously in sync with sources like SharePoint, Google Drive, S3, Kafka, and PostgreSQL. The company is also developing BDH (Baby Dragon Hatchling), a post-transformer frontier model aimed at solving continual learning and long-horizon reasoning. Pathway is trusted by organizations including NATO, La Poste, and Formula 1 teams.
Confluent
Confluent is the data streaming company founded by the original creators of Apache Kafka. Its Data Streaming Platform - anchored by fully managed Confluent Cloud and a self-managed Confluent Platform, plus managed Apache Flink for stream processing - lets organizations connect, process, and govern data in motion across clouds in real time. Used by thousands of enterprises including a large share of the Fortune 500, Confluent went public in 2021 (NASDAQ: CFLT) and in December 2025 agreed to be acquired by IBM in a deal valuing it at roughly $11 billion.