✦ Luna Orbit — Software Engineering

Senior Back-End Software Engineer, Infra

at Circle.so

📍 Remote, US Remote 💰 $130K – $140K USD / year Posted March 25, 2026
Apply Now → ← Browse All Jobs

Position Details

Salary $130K – $140K USD / year
Type Full-Time
Experience senior
Exp. Years 5+ years
Education Not specified
Category Software Engineering

About this role

This role involves maintaining and modernizing the Rails stack, building internal tools, and improving infrastructure for a SaaS platform. The engineer will focus on performance, security, and scalability.

Key Responsibilities

  • Maintain and modernize Rails stack
  • Build internal tools and SDKs
  • Support observability and reliability
  • Reduce third-party dependencies
  • Contribute to architectural decisions

Technical Overview

The environment is primarily Ruby on Rails with MySQL and PostgreSQL databases. The focus is on infrastructure, performance optimization, and architectural improvements for a remote SaaS platform.

Ideal Candidate

The ideal candidate is a senior back-end engineer with over 5 years of experience in Ruby on Rails, specializing in infrastructure, performance, and security improvements. They are autonomous, collaborative, and experienced in scaling SaaS platforms.

Must-Have Skills

Ruby on RailsMySQLPostgreSQL5+ years of back-end engineering experienceInfrastructure or platform systems focus

Nice-to-Have Skills

Scaling early-stage productsPerformance optimizationSecurity best practices

Tools & Platforms

RailsMySQLPostgreSQL

Required Skills

Ruby on RailsMySQLPostgreSQLperformance optimizationsecurityinfrastructurearchitectural improvements

Hard Skills

Ruby on RailsRubyRailsMySQLPostgreSQLPerformance optimizationSecurity enhancementDependency upgradesInfrastructureArchitectural improvements

Soft Skills

CommunicationCollaborationProblem-solvingAutonomous workHigh expectations management

Industry & Role

Industry SaaS
Job Function Back-end software engineering for SaaS infrastructure
Role Subtype Systems Engineer
Tech Domains Ruby on Rails, MySQL, PostgreSQL

Keywords for Your Resume

Ruby on RailsRailsMySQLPostgreSQLperformance optimizationsecurityinfrastructurearchitectural improvementsfull stackremotesoftware engineerbackend developerSaaSfull-timesenior

Deal Breakers

Less than 5 years of back-end experience, Lack of Ruby on Rails expertise, No remote work experience

Apply for this Position →

Get matched to jobs like this

Luna finds roles that fit your skills and career goals — no endless scrolling required.

Create a Free Profile