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Principal Engineer, Apple Cloud Object Storage (ACOS), Storage Infrastructure

Apple • Seattle, WA, US • published 2026-11-06 00:59:38.649245

Description

Summary ACOS is Apple's geo\-distributed, exabyte\-scale object storage service. It serves billions of requests per day for iCloud, Apple Music, Apple TV, Apple Maps, and Apple's internal data and analytics platforms. It provides 11\-nines of durability and 4\-nines of availability. The ACOS Storage Infrastructure team owns how data is encoded, placed, verified, repaired, and reclaimed inside a storage cluster. This includes erasure and replicated encoding schemes, data placement and rebalancing optimization, compaction, scrubbing and repair, durability modeling, performance tiering, and the supply chain that keeps available capacity in front of customer demand. In practice, this team determines what storage costs, how it survives in the face of software and hardware failures, and how fast it is served. Description This is a role for an engineer who has designed, shipped, and operated the data path of a storage system at exabyte scale. The next big challenge here is to support the industry's transition to much denser drives. This means capacity per drive is growing far faster than IOPS per drive, and maintenance operations — sealing, compaction, scrubbing, repair, rebalancing, cros...

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