Depends what you're looking for. Snowplow's stack is very broad so a single dev may not know how to navigate all levels of the stack very efficiently. Those that do know will be rare and probably not cheap on-going.
If it's an isolated part like enrichment, you may have better luck finding a specialist freelancer via Upwork or one of those Freelancer marketplaces for a particular language or task.
You can choose from a bigger pool (and hire within the same timezone). Also the documentation is top-notch so any dev that knows the language you need will be able to pick things up pretty quickly.