Senior Ruby Software Engineer

Senior Ruby Software Engineer

Chicago, IL

Direct-Hire - $120,000 - $140,000

About the job
Our client is a well-established financial services organization experiencing rapid growth. They are committed to delivering innovative, customer-centric solutions while maintaining a strong focus on operational excellence and technology advancement. With an expanding national footprint, the company offers a dynamic environment where talented professionals can contribute to meaningful transformation and long-term success.

We’re seeking a Senior Ruby Developer to help lead the development of scalable, maintainable Ruby applications. This role is well-suited for an experienced engineer who enjoys shaping technical direction, mentoring others, and solving complex problems in a collaborative environment. This role offers the opportunity to make a meaningful technical impact while helping shape a growing engineering team.

What You’ll Do
• Design, build, and maintain Ruby on Rails applications
• Lead feature development and influence system architecture
• Conduct and guide code reviews to maintain high engineering standards
• Mentor junior and mid-level developers
• Collaborate with engineering leadership and cross-functional partners
• Troubleshoot production issues and improve performance and reliability
• Participate in technical interviews and team growth initiatives

What We’re Looking For
• Strong professional experience with Ruby and Ruby on Rails
• Deep understanding of object-oriented design and clean architecture
• Experience designing APIs and working with relational databases
• Strong testing mindset (TDD, RSpec, integration testing)
• Comfort owning features, systems, and technical decisions
• Experience working in hybrid or on-site teams
• Strong communication and collaboration skills

Nice to Have
• Experience with performance optimization and scaling Rails applications
• CI/CD design or DevOps collaboration experience
• Mentorship or technical leadership experience

MMD Services Inc. is an equal opportunity employer. All applicants are considered for all positions without regard to race, religion, color, sex, gender, sexual orientation, pregnancy, age, national origin, ancestry, physical/mental disability, medical condition, military/veteran status, genetic information, marital status, ethnicity, alienage or any other protected classification, in accordance with applicable federal, state, and local laws.