Job Title: Senior Ruby Developer Experience Required: 12+ years Assignment Duration: 12+ Months Engagement Type: Contract Work Location: Chicago, IL Key Responsibilities & Required Technical Expertise: Strong Expertise with Ruby: Minimum 8 years of experience on RubyDeep knowledge of Ruby MRI internals (GIL, memory model, objectallocation)Ruby MRI garbage collector (mark & sweep, generational GC)Strong experience with Rails internals (ActiveRecord, Arel, middlewarestack)Ability to optimize slow