Back-end Java Engineer

Jobbeskrivning
Join us at Sigma to be part of a team of consultants that will work at Apple with features relating to the Find My network. You will be part of the back-end services that locate lost devices even without network connections, using a crowd-sourced network of nearly a billion devices worldwide. You will work on designing, producing, and maintaining scalable, reliable, and privacy-focused services that operate at massive scale. This is a highly autonomous role where you'll handle everything from design to production within a fast-changing roadmap environment. Strong problem-solving skills and the ability to adapt to shifting priorities are crucial.
Design, develop, and maintain highly scalable, reliable backend services supporting the Find My network
Manage services end-to-end including design, production deployment, and ongoing maintenance
Work collaboratively with multiple teams managing cross-team dependencies without compromising quality
Adapt rapidly to shifting priorities and rewrite plans based on evolving goals, threat models, and partner requirements
Build frameworks used internally and by other teams and developer communities
Investigate and debug complex concurrency and production issues that appear only under real load or concurrency conditions
Write clear technical documentation and communicate decisions effectively to both technical and non-technical stakeholders

Baskunskaper
5+ years of production experience with deep expertise in Java, including memory model, garbage collection tuning, and concurrency utilities beyond synchronized
Proven experience building and scaling customer-facing web services addressing authentication, authorization, availability, spam control, reliability, and performance tuning under load
Strong understanding of distributed systems concepts such as consistency, partitioning, and failure modes
Experience with data storage and caching technologies like Cassandra, Redis, or memcached
Experience writing REST-based services using frameworks like Netty
Knowledge and experience with CI/CD tools and full automation testing
Strong written and verbal communication skills for explaining technical decisions, writing design documents, and collaborating across disciplines

Personliga färdigheter, egenskaper, erfarenhet
Knowledge of cryptography standards and protocols, including PKCS, KMIP, X.509, AES, KDF, CA
Familiarity with machine learning systems, frameworks, and algorithms
Experience with GitHub and build and deployment tools such as Maven, Docker, Spinnaker, and Kubernetes