Senior Backend Engineer | Rails Performance & Cost Optimization
I help scaling SaaS companies reduce Rails infrastructure costs 30-50% through performance optimization. 9 years experience with measurable results: €160k annual savings, 98% performance improvements, 50% faster deployments.
seanfloyd.dev • linkedin.com/in/seanlf
Backend engineer specializing in Rails performance optimization and cost reduction. Proven track record scaling multi-tenant SaaS platforms serving millions of users.
Available for: Remote B2B consulting with scaling SaaS companies. Modern Rails applications (Rails 7+) facing performance or cost challenges — not legacy modernization projects.
Work setup: B2B contracts via US LLC Work rights: Canada, EU, United States
Led performance optimization and cost reduction initiatives for a multi-tenant SaaS platform (1M+ users, 600+ communities).
Performance & Cost:
- Reduced data export time by 98% for 1M+ user communities (hours → 45 minutes)
- Cut background job runtime by 66%, saving 1.5k compute hours monthly
- Reduced annual infrastructure costs by €160k through CI/CD optimization and autoscaling
- Cut build times 50% while doubling deployment frequency
Platform Evolution:
- Architected versioned REST API infrastructure (OAuth2, OpenAPI, rate limiting)
- Led platform-wide Ruby 3 and Rails 7 migration with zero downtime
- Built developer tooling reducing onboarding from days to hours
Backend & Performance Ruby (9 years) • Rails (Rails 7+) • PostgreSQL • Redis • Elasticsearch • Sidekiq • Performance tuning • APM (Datadog, Sentry)
CI/CD & Infrastructure Docker • Kubernetes (application-level) • CI/CD (Buildkite, CircleCI, GitHub Actions) • Application monitoring
API Architecture REST APIs • API versioning • OAuth2 • OpenAPI/Swagger • Rate limiting • gRPC
LLM Integrations Python • LLM API integration • MCP server development
still_active — RubyGem for dependency health verification Helps Rails teams identify abandoned dependencies before they become security risks.
Jazzify — Production volunteer platform (9 years) Built and maintained Rails platform for Ottawa Jazz Festival, processing thousands of applications annually. Full production operations: CI/CD, monitoring, deployments.
Rails Core Contribution — ActiveSupport performance fix Discovered and fixed production bottleneck achieving 20x-670x speedup.
Weather MCP Server — LLM integration Model Context Protocol server integrating Canadian government weather data for AI agents.
I focus on measurable improvements in Rails application performance and infrastructure costs. Best fit for:
- Rails performance optimization (database, background jobs, API)
- Infrastructure cost reduction (CI/CD, autoscaling, resource optimization)
- API architecture (versioning, authentication, documentation)
- Developer tooling and productivity
Remote-first with proven track record across 17+ countries. Typically 30hrs/week, flexible for compelling opportunities.