SparkRails
Senior Ruby on Rails Consultant
for Legacy SaaS Apps
I help remote SaaS teams upgrade, debug, stabilize, and maintain production Rails applications — especially older Rails apps with performance, Sidekiq, Redis, caching, or upgrade problems.
Available for US, UK, Europe, Canada, Singapore, and remote-first teams.
Is your Rails app becoming hard to maintain?
If any of these sound familiar, you're not alone — and they're fixable.
- Rails upgrade stuck on an old version
- No test coverage — every change feels risky
- Slow pages or background jobs in production
- Redis / Sidekiq issues — stuck jobs, retries, memory growth
- Cache memory problems and unpredictable evictions
- Old gems and a fragile production deployment
- Senior Rails developer left — no clear owner
- Changes that used to take a day now take a week
How I can help
Focused engagements built around the work your team actually needs — not a generic agency package.
Rails Upgrade Support
Move from Rails 4.x, 5.x, or 6.x to Rails 7 with a clear, incremental plan. Gem audits, deprecation cleanup, and the painful edge cases that block upgrades in real production apps.
Legacy Rails App Rescue
For apps that have grown messy — limited tests, outdated patterns, unclear ownership. I stabilize the codebase, document the critical paths, and make day-to-day changes safe again.
Performance, Caching & Sidekiq Debugging
Slow endpoints, ballooning Redis memory, stuck Sidekiq queues, cache stampedes. Investigation with profiling, logs, and metrics — then targeted fixes, not rewrites.
Fractional Rails Backend Support
Ongoing senior Rails capacity for teams without a dedicated backend lead. Code review, architecture input, on-call backup, and steady progress on the backlog you keep deprioritizing.
Hands-on production Rails experience
Years of work inside production Rails codebases — the kind that have been running for a long time, carry real customers, and can't be paused for a rewrite.
- Rails 6 and Rails 7 upgrade work on live SaaS apps
- Debugging production issues with logs, metrics, and profiling
- Sidekiq and Redis workflows — queues, retries, memory, reliability
- Caching and performance investigation across requests and jobs
- Legacy Rails apps with limited test coverage
- Safe, incremental refactors on apps that can't go down
Have a Rails app that needs help?
Send me a short description of the issue. I'll reply with possible next steps.
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