Senior Full-Stack Engineer

About the Role

Join Circle’s Payments team as a Senior Full-Stack Engineer to expand the monetization engine powering thousands of community-based businesses. This role offers the exciting opportunity to work across infrastructure and product surfaces, from integrating new payment providers to building high-converting paywalls and subscription tools.

Responsibilities

• Work autonomously across our Ruby on Rails backend and React front-end to deliver high-quality features quickly and safely.
• Lead complex projects end-to-end, driving architectural and product decisions.
• Build and evolve monetization features like paywalls, upsells, affiliate tools, and subscription settings.
• Integrate and scale payment solutions (e.g., Stripe, PayPal, in-app payments) to support global audiences, multiple currencies, and diverse business models.
• Optimize checkout and paywall experiences for reliability, conversion, and seamless UX.
• Collaborate with leadership, product, and design from early exploration to launch.
• Continuously improve performance, developer experience, and code quality.
• Balance iteration speed with technical and UX excellence, shipping behind feature flags where needed.

Requirements

• 5+ years of experience building and maintaining complex full-stack web applications.
• Advanced proficiency in Ruby on Rails, MySQL/PostgreSQL, ReactJS, TypeScript, CSS/SCSS, and TailwindCSS.
• Hands-on experience integrating and maintaining payments in production environments.
• A strong understanding of checkout flows, subscription lifecycles, and monetization mechanics.
• Product mindset: curiosity about the “why” and focus on user outcomes.
• Comfort operating with autonomy in a fast-paced, remote-first environment.
• Adaptability and willingness to shift focus as business needs evolve.
• Experience working on a fully distributed team.

Nice-to-Haves

• Experience with advanced Stripe features (Connected Accounts, Subscriptions, Invoicing, Subscription Schedules).
• Background working with community platforms, creator tools, or other user-first SaaS products.
• Track record of building polished, pixel-perfect interfaces with attention to detail.