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EngineeringMay 29, 2026· 7 min read

Meet Atlas: the Ferr session runtime

Atlas is the orchestration layer that turns a single browser call into a managed fleet.

MT
Marco T.
Engineering

Under every Ferr session is Atlas, the runtime that schedules browsers onto warm capacity, handles retries, and keeps state consistent when you fan out to thousands of pages at once.

One call, a whole fleet

Atlas exposes the same create-a-session surface whether you want one browser or ten thousand. You describe the work; Atlas places it, watches it, and cleans up after it.

fleet.py
from ferr import Ferr
 
ferr = Ferr()
fleet = ferr.fleet.map(
urls,
stealth=True,
concurrency=250,
)
 
for result in fleet:
save(result.url, result.data)

Built for backpressure

When a target slows down, Atlas slows with it instead of hammering the site. That single behavior removes the most common reason large crawls get blocked.

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