Senior Software Engineer - Core Platform (Ruby/Rails)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Engineer - Core Platform (Ruby/Rails) based in United States. This is a senior engineering role focused on building and scaling foundational platform capabilities for a growing cybersecurity product suite.You’ll own complex projects end to end, from technical design and implementation through testing, deployment, and rollout.The role spans backend, frontend, databases, infrastructure, and external integrations, giving you broad technical ownership.You’ll work primarily with Ruby on Rails while contributing to modern frontend experiences and large-scale platform systems.Your work will directly support critical capabilities such as authentication, onboarding, notifications, APIs, and the overall user experience.You’ll also help shape engineering practices through technical leadership, mentoring, code reviews, pairing, and thoughtful architectural decisions.This is a fully remote environment where strong collaboration, ownership, maintainability, and practical problem-solving are highly valued.