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Kevin Mutyaba

@kevinmutyaba

Senior Ruby on Rails Engineer at Airbnb who cut p95 API latency by 25% and reduced background job failures by 30%.

At Airbnb, I reduced p95 API response latency by 25% through PostgreSQL query optimization, targeted indexing, and Redis caching. I also reduced background job failures by 30% by improving Sidekiq retry handling, fault tolerance, and monitoring.

At GitHub, I cut critical PostgreSQL query execution time by 35% and modernized four legacy Ruby on Rails services through dependency upgrades, architectural refactoring, service extraction, and database migrations.

Earlier at Microsoft, I owned the design, implementation, and production delivery of backend application services. Across my work, I’ve developed Ruby on Rails applications and REST and GraphQL APIs, while improving database performance and production reliability.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Airbnb

Jan 2025 - Present (1 year 9 months)

Architect and develop scalable Ruby on Rails backend services supporting high-volume production systems. Reduced p95 API response latency by 25% and background job failures by 30%.

Ruby on Rails PostgreSQL ActiveRecord Redis Sidekiq REST APIs GraphQL RSpec AWS Docker Kubernetes Terraform GitHub Actions Claude Code OpenAI Codex Cursor GitHub Co Pilot

Senior Software Engineer

GitHub

Jun 2019 - Dec 2024 (5 years 6 months)

Reduced critical PostgreSQL query execution time by 35% and modernized four legacy Ruby on Rails services. Developed and maintained scalable Rails backend systems.

Ruby on Rails PostgreSQL ActiveRecord Redis Sidekiq GraphQL REST APIs React TypeScript RSpec Docker AWS Kubernetes GitHub Actions

Senior Software Engineer

UrbanDoor

Jun 2016 - Jul 2018 (2 years 1 month)

Developed and maintained full-stack Ruby on Rails applications for property management and booking workflows. Built and integrated RESTful APIs and improved database performance.

Ruby on Rails PostgreSQL React Redis Sidekiq REST APIs RSpec AWS Docker Linux CI CD

Software Development Engineer II

Microsoft

Mar 2014 - Jun 2016 (2 years 3 months)

Owned design, implementation, and production delivery of backend application services. Improved backend performance through SQL optimization and caching strategies.

Ruby Ruby on Rails SQL PostgreSQL JavaScript REST APIs Redis RSpec Git Linux CI CD

Software Development Engineer I

Microsoft

Oct 2012 - Mar 2014 (1 year 5 months)

Developed Ruby on Rails backend functionality including business logic, database models, and REST endpoints. Improved software quality through automated testing and code reviews.

Ruby Ruby on Rails SQL JavaScript REST APIs HTML5 CSS Git Linux Testing Automation

Software Engineer

Yammer, Inc.

Jan 2012 - Oct 2012 (9 months)

Developed and maintained Ruby on Rails application features and backend business logic. Implemented ActiveRecord models, SQL queries, and RESTful endpoints.

Ruby Ruby on Rails ActiveRecord SQL JavaScript Git