Note: The job is a remote job and is open to candidates in USA. Circle is building an AI-powered, all-in-one platform for digital businesses. The company is seeking a Senior Full-Stack Software Engineer to join its CMS Platform team and build customer-facing Page Builder features alongside the backend systems supporting content modeling, rendering, publishing, permissions, and performance.

Responsibilities

• Build and ship Page Builder features that directly impact how customers design and publish their sites
• Work across the stack using React & TypeScript (frontend) and Ruby on Rails (backend)
• Partner closely with product/design to translate specs into high-quality, user-friendly experiences
• Improve the architecture of the builder/editor and publishing pipeline for reliability, extensibility, and performance
• Own projects end-to-end—from technical design through implementation, testing, rollout, and iteration
• Review PRs thoughtfully and contribute to a culture of quality and continuous improvement
• Work async-first and communicate clearly and proactively

Skills

• • Strong alignment with our values. Find our values on our career page if you haven't read up on them yet
• • 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,” sweat UX details, and iterate based on customer needs
• • Experience building complex, stateful UI (editors, builders, or design tools) and/or the systems behind them
• • Solid 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
• • Exceptional written and verbal communication skills in English (CEFR C2 or equivalent), as most collaboration at Circle happens asynchronously
• • Experience working on site builders, page editors, or CMS platforms
• • Experience with rich text/content editing, drag-and-drop interactions, component systems, or design tooling
• • Familiarity with web performance, caching strategies, and scaling high-traffic rendering/publishing systems
• • Prior experience at an early-stage or growth-stage startup
• • Contributions to open-source projects or developer communities

Benefits

• Equity in the company with ongoing refresh grants
• 35 days of paid time off each year
• Remote-only work arrangement
• Company retreats twice a year in incredible destinations around the world
• Incredible flexibility and autonomy
• A benefits package that supports health, wellbeing, and professional growth

Company Overview