Senior Full-Stack Software Engineer, CMS

About the Role

We’re hiring two senior full-stack engineers to join our CMS organization — one on CMS Core and one on CMS Builder. These teams are responsible for some of the most critical and widely-used surfaces across Circle’s product. CMS Core owns our core community features like discussions, courses, the Home feed, search, and digests. CMS Builder is behind our powerful new site builder, enabling customers to create beautiful, custom web experiences with ease.

What you’ll be doing

• Build and ship high-impact features used by millions of people.
• Work across the stack using React & TypeScript (frontend) and Ruby on Rails (backend).
• Improve the quality of our codebase and identify architectural opportunities for long-term evolution.
• Collaborate closely with Circle’s co-founders and product/design teams throughout the spec and design process.
• Review PRs with care, contributing to a culture of thoughtful and constructive feedback.
• Work async-first and bring clear, proactive communication to everything you do.

What you’ll need to be successful

• Strong alignment with our values. Find our values on our career page if you haven’t read up on them yet.
• You are proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5.
• 5+ years of experience building and scaling SaaS products.
• Deep experience with Ruby on Rails and strong proficiency with React & TypeScript.
• A product mindset — you care about the “why” behind what you’re building and aim to deliver great UX.
• Experience working on high-throughput, high-concurrency systems.
• Sound architectural judgment and a high bar for quality, balanced with pragmatism.
• Comfort working with and alongside AI tools in your development workflow.
• Excellent async communication and collaboration skills.