Salary
$110/hr
Posted
13 Aug 2026
Last seen
13 Aug 2026
Location
Anywhere in the World
Lifecycle
fresh
Grade
A
Ruby on Rails Ruby freelance Engineering
Senior Backend Engineer (Ruby on Rails)About the RoleWe are seeking a Senior Backend Engineer with strong Ruby on Rails experience to support critical upgrades across our existing platform. The ideal candidate will have deep experience working in monolithic applications and be comfortable upgrading major dependencies and infrastructure components in a production environment.This role will focus on modernizing and maintaining a legacy codebase while ensuring stability and performance during system upgrades.Key ResponsibilitiesLead upgrades of core backend technologies within a Ruby on Rails monolithUpgrade and maintain Ruby and Rails versions across the applicationSupport upgrades of key infrastructure components including Redis, MySQL, and SidekiqAssist with upgrading Node.js dependencies within a legacy frontend projectIdentify potential compatibility issues and implement solutions to ensure system stabilityCollaborate with engineering teams to safely deploy upgrades and maintain production reliabilityRequired QualificationsSenior-level experience developing backend systems with Ruby and Ruby on RailsExperience working within large monolithic applicationsStrong experience performing major package or framework upgrades in production systemsAbility to troubleshoot compatibility issues and refactor code where necessaryStrong understanding of backend system architecture and dependency managementNice to HaveExperience with TypeScriptExperience with Node.jsFamiliarity with modernizing legacy systems or incremental architecture improvementsExample ProjectsRuby version upgrade within a monolith projectRails framework upgradeRedis upgradeMySQL upgradeSidekiq upgradeNode.js upgrade within a legacy frontend codebase