Mike Hall

Staff Software Engineer

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Role & Career Context

Detailed experience breakdown, architectural achievements, and related archival artifacts.

Senior Backend Developer

SK Holdings, Inc. | Chicago, IL | -

Led backend stability, performance, and modernization for high-traffic Rails products, improving full-text search, campaign delivery pipelines, and data layer reliability while systems remained under production load.

  • Search Infrastructure Modernization: Eliminated external cluster failure modes and reduced operating footprint by migrating legacy Sphinx to optimized MySQL full-text search and relational indices under live production traffic.
  • Zero-Downtime Rails Upgrades: Led Ruby and Rails framework upgrades across core applications, sequencing database migrations to ensure zero downtime during platform modernization.

Skills: Ruby on Rails, MySQL, Full-Text Search, Redis, Sidekiq, SendGrid Async Pipelines, Data Analytics & SQL, CI/CD, System Observability, Backend Architecture