Bellevue, Wash.-based startup Union.ai announced that it closed a $38.1 million Series A round, led by NEA, with participation from Nava Ventures and new investor Mozilla Ventures. The total includes a previously announced $19.1 million portion raised in 2023.
Union is the company behind Flyte, an open-source orchestration tool used to run complex machine learning and data workflows. Union is positioning itself as broader “AI development infrastructure” — covering orchestration as well as pieces such as training, inference, and observability — aimed at helping engineering teams move from experimentation to production faster.
“Building AI requires a fundamentally different approach than traditional software, and engineering teams are now embracing that,” CEO Ketan Umare said in a statement.
More from the company’s post on LinkedIn:
This funding comes at an inflection point for AI: engineering teams are discovering that legacy software infrastructure and devtools struggle to handle AI development. They were designed for basic and deterministic processes of traditional data workflows, not for the non-deterministic processes of AI workflows, which expect agents to adapt and recover from failure at runtime. Union.ai is building the new category of AI development infrastructure. Engineering teams can develop dynamic, durable AI workflows and agents while dramatically reducing time spent maintaining brittle pipelines.
The startup says revenue grew 3X in 2025, and its customer base expanded 2.6X. Union’s customers include Spotify, HederaDx, Carfax, Hopper, and others.
The company says the round supports the commercial launch of Union 2.0 and continued development of Flyte 2, including “pure Python” authoring, improved debugging, runtime decision-making, and crash-resilient workflows.
Umare helped develop the underlying technology for Flyte while he was an engineer at Lyft. He previously worked at Amazon and Oracle. He co-founded Union.ai in 2020 with Haytham Abuelfutuh.
The company has more than 40 employees and is actively hiring.
Investors are backing various startups building behind-the-scenes infrastructure to help companies turn AI prototypes into reliable products. Temporal, a “durable execution” company rooted in the Seattle region, announced a $300 million round last week.
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