Senior Back End Engineer (Ruby on Rails & GO)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Back End Engineer (Ruby on Rails & GO) based in United States.

This role sits at the heart of a high-scale, real-time product powering millions of daily users in a fast-growing sports technology environment. You will design and build backend services that support critical internal operations, from risk management and trading systems to real-time scoring and contest configuration. Working across both a mature Ruby on Rails monolith and an evolving Go microservices architecture, you will help shape the future of a platform undergoing intentional transformation. The role combines deep engineering ownership with architectural influence, requiring someone comfortable in both legacy systems and greenfield development. You will solve complex distributed systems challenges, improve performance under heavy load, and ensure system reliability at scale. In addition, you will collaborate closely with product and cross-functional teams while mentoring other engineers and contributing to engineering excellence across the organization.