Principal Lead Distributed Systems Engineer - Services Special Projects

Apple's Special Services Team is seeking a Lead (Principal) Distributed Systems Engineer to design and build massively scalable, highly available services that power experiences for Apple customers both now and in the future. In this Lead role, you will build and operate high-throughput, low-latency backend services that ingest, process, and serve data at scale across a range of mission-critical workloads — from real-time transactions to analytics and content delivery. You'll also drive the evolution of a multi-tenant platform, including AI/ML-powered services, by shipping new capabilities, scaling what exists, and applying distributed-systems best practices from design through production. Master's degree in Computer Science or a related field 15+ years of professional software development experience building scalable, distributed systems in production, with at least 5 in a Principal or Sr. Staff Level role. Experience building, authoring, and operating large-scale, multi-tiered distributed systems and customer-facing web services: including API design, authentication, authorization, scaling for high availability, concurrency, and reliability. Strong understanding of concurrency and multi-threaded programming, fundamental data structures, and efficient algorithm design Strong proficiency in Java; working knowledge of a second systems language (Go, C++) is a plus. Solid OO analysis and design skills. Strong proficiency in application frameworks (Spring boot) Hands on experience with JVM performance tuning and profiling - GC selection/tuning, JFR, async-profiler, heap/thread-dump analysis for low-latency services. Hands-on with async and reactive JVM stacks: Netty, Project Reactor, RxJava, Vert.x, or Micronaut/Quarkus. Rigorous testing discipline with JUnit 5, Mockito, AssertJ, Testcontainers, and contract testing. Hands on experience with build and dependency management with Gradle Deep understanding of transactional consistency models - ACID semantics, with deep knowledge of tradeoffs between relational and NoSQL database technologies Expertise with synchronous and asynchronous network I/O and RPC frameworks (gRPC) Experience building and maintaining CI/CD pipelines (e.g., Jenkins, GitHub Actions, GitLab CI, or similar) for automated testing, build, and deployment of production services. Experience with AWS or GCP and cloud-native tooling (Docker, Kubernetes) in the context of deploying scalable production grade services. Experience with event streaming and queueing systems (specifically Kafka) and stream processing frameworks and high-throughput, append-only write paths for durable, queryable historical records. Hands on Experience of leveraging data storage (Iceberg, Cassandra) and caching technologies (Redis) in Production services Hands on experience with Serialization/schema tooling: Jackson, Protobuf, Avro, and Schema Registry Experience identifying, triaging, and remediating security vulnerabilities in production services (dependency management, secure code review, threat modeling). Full life-cycle development experience for a consumer product, from concept through deployment Proven history of presenting technical and business concepts to Executive Leadership