DeltaStream
DeltaStream is a San Mateo, California-based startup that operates a serverless stream processing platform built on Apache Flink.
Profile
DeltaStream provides a serverless platform for processing and analyzing streaming data in real time, powered by Apache Flink, without requiring users to manage infrastructure.
DeltaStream is a San Mateo, California-based startup that operates a serverless stream processing platform built on Apache Flink. Founded in 2020, the company raised a $10 million seed round in July 2022 led by New Enterprise Associates (NEA), followed by a $15 million Series A in September 2024 co-led by NEA, Galaxy Interactive, and Sanabil Investments, bringing total disclosed funding to $25 million. As of mid-2026, PitchBook reports the company has 16 employees.
The platform allows customers to process and analyze streaming data in real time without managing underlying infrastructure, targeting use cases such as real-time analytics, monitoring, and alerting across multiple data sources. DeltaStream competes in the crowded stream-processing space against companies like Materialize, Ascend.io, and DataPelago. The company has not publicly disclosed revenue, customer count, or named clients.
Its small headcount and reliance on a single major funding round suggest an early-stage, pre-product-market-fit trajectory. The Series A was announced via a press release on the company's site, but no independent media coverage of that round has been published beyond the seed round coverage by TechCrunch in 2022. The company's website uses standard B2B analytics tools (HubSpot, Leadfeeder, Visitor Queue, Microsoft Clarity), indicating active lead generation but no public evidence of enterprise-scale deployments.
The founding team's background includes experience at Confluent and other streaming infrastructure companies, though specific founder names beyond CEO Hojjat Jafarpour are not widely reported. The company's go-to-market strategy appears focused on developers and data engineers seeking a managed Flink service, but the lack of published case studies, customer logos, or independent technical reviews makes it difficult to assess traction. The most interesting open question is whether DeltaStream can differentiate from larger cloud providers' managed Flink offerings (Amazon Kinesis Data Analytics, Confluent Cloud) and open-source alternatives before its current capital runs out.
Who buys this
- Data engineering teams at mid-market companies needing real-time stream processing without managing Flink clusters
- Enterprises running event-driven architectures on Kafka or Kinesis who want SQL-based stream analytics
- Startups building real-time monitoring, alerting, or personalization features on streaming data
- Organizations migrating from batch processing to streaming but lacking in-house Flink expertise
Strengths and what to watch
Strengths
- Serverless abstraction over Apache Flink reduces operational overhead for teams without dedicated stream-processing infrastructure skills
- Backed by NEA, a top-tier venture firm with deep enterprise software experience, plus Galaxy Interactive and Sanabil Investments providing $25M in total funding
- Founded by a team with prior experience at Confluent and other streaming infrastructure companies, giving domain credibility
Watch for
- No publicly named customers or case studies exist, making it impossible to verify product-market fit or enterprise adoption
- Headcount of 16 employees is extremely small for a company that has raised $25M, suggesting either capital inefficiency or a very narrow engineering-focused team
- Competes directly with managed Flink services from AWS, Confluent, and Google Cloud, as well as open-source alternatives, with no clear technical or go-to-market differentiation publicly documented
Key Information
- Industry
- Streaming/In-Memory
- Founded
- 2020
- Headquarters
- San Mateo, California
Frequently Asked Questions
What is DeltaStream?
DeltaStream is a San Mateo-based startup that provides a serverless stream processing platform built on Apache Flink. It lets users process and analyze streaming data in real time without managing the underlying infrastructure, targeting use cases like real-time analytics and monitoring.
How does DeltaStream work?
DeltaStream runs on Apache Flink but offers a serverless abstraction, so users don't need to manage clusters or infrastructure. It processes streaming data from sources like Kafka or Kinesis in real time, supporting SQL-based analytics for monitoring, alerting, and personalization.
Who are DeltaStream's target customers?
DeltaStream targets data engineering teams at mid-market companies needing real-time stream processing without managing Flink clusters. It also serves enterprises running event-driven architectures on Kafka or Kinesis, startups building real-time features, and organizations migrating from batch to streaming.
How much funding has DeltaStream raised?
DeltaStream has raised a total of $25 million in disclosed funding. This includes a $10 million seed round in July 2022 led by NEA, and a $15 million Series A in September 2024 co-led by NEA, Galaxy Interactive, and Sanabil Investments.
Who are DeltaStream's main competitors?
DeltaStream competes in the stream-processing space against companies like Materialize, Ascend.io, and DataPelago. It also faces competition from managed Flink services offered by larger cloud providers such as Amazon Kinesis Data Analytics, Confluent Cloud, and Google Cloud.
Does DeltaStream have any publicly named customers?
As of mid-2026, DeltaStream has not publicly disclosed any named customers, case studies, or independent technical reviews. This lack of public evidence makes it difficult to verify product-market fit or enterprise adoption, despite the company having raised $25 million.
Sources
- pitchbook.com — Company founded 2020, 16 employees, Series A $15M in September 2024, seed round July 2022, total raised $25M, investors NEA, Galaxy Interactive, Sanabil Investments, HQ San Mateo CA
- www.cbinsights.com — Total raised $25M over 2 rounds, Series A $15M on September 17, 2024, seed round July 13, 2022, investors NEA, Galaxy Interactive, Sanabil Investments
- www.deltastream.io — Company press release announcing $15M Series A on September 17, 2024, led by NEA, Galaxy Interactive, Sanabil Investments
- techcrunch.com — TechCrunch coverage of $10M seed round on July 13, 2022, led by NEA, CEO Hojjat Jafarpour, plans to hire 5 employees
- deltastream.io — Company website, product description as serverless stream processing platform on Apache Flink, use of HubSpot, Leadfeeder, Visitor Queue, Microsoft Clarity for analytics