Mike Hall

Principal 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 Simplification: Replaced legacy external search clusters (Sphinx) with native MySQL full-text search and optimized relational indices, eliminating external service dependencies and reducing platform infrastructure footprint.
  • High-Volume Messaging Pipelines: Designed and validated asynchronous batch delivery pipelines via SendGrid and Sidekiq, enforcing IP warmup protocols and deliverability safety for large-scale campaign operations.
  • Data Engine & Analytics: Engineered complex relational analytical queries across multi-million row content catalogs, powering real-time data visualizations and international media publishing.
  • Zero-Downtime Platform Upgrades: Led Ruby and Rails framework upgrades across multiple core applications, sequencing database migrations and dependency updates to maintain uptime 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