Ruby Developer (Chicago)
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Job Title: Lead Ruby DeveloperDuration: 12+ MonthsWork Location: Chicago, ILKey Responsibilities &Strong Expertise with Ruby:• Minimum 12 years of experience on Ruby• Deep knowledge of Ruby MRI internals (GIL, memory model, object allocation)• Ruby MRI garbage collector (mark & sweep, generational GC)• Strong experience with Rails internals (ActiveRecord, Arel, middleware stack)• Ability to optimize slow queries, N+1 issues, and memory leaks• Experience with multi-threaded / concurrent Ruby (Puma, Sidekiq tuning)• Ruby VM instruction set (YARV bytecode basics)• Concurrent Ruby gem• Thread pools vs Fibers vs Ractors• Async frameworks (Falcon / Async gem)• Experience integrating Ruby with Kafka (ruby-kafka / Karafka), exactly-oncesemantics handling• Designing: event schemas, schema evolution (Avro / JSON schema)Proven experience scaling Rails apps to:• 10K+ RPS• millions of daily transactionsHands-on experience with:• Event-driven architecture (Kafka / RabbitMQ)• CQRS & Event Sourcing• Saga pattern (choreography & orchestration)