Senior Rails Performance Engineer

Fleetio is a modern SaaS platform that helps thousands of organizations worldwide manage their fleet of vehicles and equipment. Founded in 2012, they raised a Series D in 2025 with $450M, serving 6k+ customers and achieving $65M+ ARR with 350+ employees and a 4.5 Glassdoor rating. Fleetio is a proud founding member of the Rails Foundation and has been remote-first since 2012.

Our Platform Engineering team is looking for a Senior Rails Performance Engineer to help run, maintain and improve the performance of our Ruby on Rails Stack and Infrastructure. You will help scale our application using best in class architecture and software design. This includes training, software engineering, system design and operational practices that support the needs of our engineers and customers while accounting for future growth. You will be entrusted with proactively identifying and owning initiatives that will help improve the performance, reliability, and scalability of our application stack and databases.

Who You Are Our ideal candidate is an Engineer experienced in scaling Ruby on Rails applications, with a passion for optimization and performance improvements. You bring a strong background in Performance and Infrastructure Engineering for Rails applications. You follow Agile and DevOps principles, can effectively influence teams to achieve goals, and demonstrate excellent problem-solving skills in our fast-paced environment.

Your Impact Proactively identify, triage, and resolve performance issues. Enhance system observability by monitoring performance metrics across Ruby, Rails, and database systems, including SLOs and SLIs. Guide product engineers on Ruby/Rails performance and database best practices through code reviews and pair programming. Optimize performance through instance configuration and monitoring. Collaborate with other SREs to proactively identify and address performance bottlenecks. Lead database capacity planning and upgrade initiatives. Manage the database-specific components of disaster recovery planning and execution. Oversee backup systems and pre-production databases. Create and maintain infrastructure and operations documentation. Participate in the on-call rotation.

Your Experience 5+ years of Ruby/Rail Experience. 3+ years of AWS Experience. Kubernetes experience. Experience with profiling and benchmarking source code. Effective at code review, and identifying potential performance problems before they reach production. Experience with Datadog or other APM tools. Excellent written and verbal communication skills. Considered a Plus Infrastructure as Code tools (Terraform). Deep understanding of cloud network fundamentals (routing, firewalls, load balancers, CDNs, VPCs, etc.). Experience with distributed event and data stores, such as Kafka, Redis, Elasticsearch, Memcached, and TimescaleDB. You know a thing or two about the fleet management industry.