The all-in-one community platform for creators.

Circle

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full-stack-engineer

Circle is an all-in-one community platform designed for creators, brands, and startups to build, engage, and monetize their communities. It integrates tools for discussions, events, courses, and membership management into a seamless experience under one customizable brand. Circle offers features such as live streaming, gamified rewards, member directories, and extensive integrations with existing tools, allowing users to create private spaces, automate workflows, and manage payments. This platform is ideal for building different types of communities including customer, course, and coaching groups, providing a space for collaboration, interaction, and growth.

• Ship full-stack AI projects end-to-end on a product built in Ruby on Rails backend and React frontend.
• Design and run experiments (including A/B tests, AI evaluations, or others) to validate AI features, measure impact, and guide iteration.
• Build and integrate components for AI infrastructure and optimize them for performance and reliability to support production-level inferencing.
• Improve processes, tools, and systems to scale AI features into production-ready solutions.
• Help us stay up-to-date with the cutting-edge AI research, techniques, and tools.
• Work closely with Circle's leaders and designers throughout the feature design process.
• Foster a bias for action by prioritizing speed of iteration, experimentation, and learning, while maintaining high standards of code quality and user experience.

Senior Full-Stack Software Engineer, Applied AI

Full-Stack Software Engineer developing AI projects end-to-end at Circle's Applied AI team. Proficient in Ruby on Rails, MySQL, and ReactJS with a strong focus on AI features.

• Shipping often and with care, balancing speed with thoughtful, quality work.
• Owning end-to-end projects — from concept and development to rollout and measurable results.
• Partnering with engineers, designers and product leaders to craft member experiences that feel beautiful, simple, and premium.
• Scaling our billing infrastructure to support both self-service and sales-led use cases.
• Designing and implementing A/B tests to validate changes that boost user acquisition, retention, and expansion.
• Building world-class analytics that empower community owners with deep insights to understand and grow their communities.
• Implementing event instrumentation for each initiative to ensure impact can be tracked.

Senior Full-Stack Software Engineer, Growth

Senior Full-Stack Engineer joining Circle's Growth Engineering team to enhance billing, onboarding, and analytics systems. Deliver impactful solutions in a remote-first, collaborative environment.

• Work autonomously across our Ruby on Rails backend and React front-end to ship high-quality features quickly and safely.
• Lead complex projects end-to-end, driving architectural and product decisions.
• Design and scale our subscription billing and invoicing platform, including multiple pricing structures, plan changes, proration, invoicing, and full subscription lifecycle events.
• Anticipate and design for common billing edge cases such as partial periods, legacy pricing, tax/VAT integration, and failed payments.
• 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 UX.
• Collaborate with leadership, product, and design from early exploration through launch.
• Continuously improve performance, developer experience, and code quality.
• Balance iteration speed with technical and UX excellence, shipping behind feature flags when needed.

Senior Full-Stack Software Engineer, Payments

Full Stack Engineer joining Circle’s Payments team to develop and enhance billing and invoicing systems. Collaborate on payment solutions while working remotely from anywhere in the world.

platform-engineer

• Build evaluation infrastructure to measure AI system speed and accuracy — both offline (during development) and online (in production).
• Create observability tooling and dashboards that surface quality metrics week-over-week.
• Diagnose quality gaps. When accuracy drops, trace whether it's retrieval, ranking, prompting, or something else causing the issue.
• Experiment with different models and agent configurations, using data to guide decisions.
• Prototype and validate improvements to our RAG pipeline — chunking strategies, retrieval methods, re-ranking approaches.
• Analyze how our customers are using our AI features to help us identify improvements or new areas for development.
• Work closely with other engineers to give them confidence that their changes improve quality.
• Help us stay up-to-date with the cutting-edge AI research, techniques, and tools.

AI Platform Engineer, Applied AI

AI Platform Engineer at Circle leveraging AI technology to enhance customer experience. Focused on production AI systems and infrastructure for measuring performance and accuracy.

product-designer

• Own the design strategy for Applied AI surfaces, from discovery through shipped experiences
• Provide thought leadership for Applied AI at Circle: stay on top of AI and UX trends and drive our direction in this area
• Operate with high autonomy: you identify opportunities, frame the problem, and drive from 0→1 with minimal guidance
• Act as a peer to Product and Engineering on product decisions, not just a downstream executor
• Design end-to-end AI experiences—from initial concept to launch—including agents, workflows, and copilot features
• Define patterns for AI-assisted and AI-automated actions: triggering, monitoring, correcting, and building user trust
• Tackle novel UX problems around transparency, control, and error handling for unpredictable systems
• Prototype and test AI-powered flows and interactions quickly with users
• Collaborate closely with engineers and design engineers using Cursor and Claude Code to turn your concepts into working experiences
• Work embedded with engineering and ML teams, iterating as capabilities evolve

Lead Product Designer, Applied AI

Lead Product Designer designing AI-native experiences for Circle's Applied AI team. Shaping AI interaction for community managers and creators through innovative design approaches.

• Own the design strategy for growth across key surfaces (sign-up, onboarding, activation, upgrade paths, revenue flows)
• Design end-to-end flows for sign-up, onboarding, and activation—optimizing for both conversion and long-term engagement
• Own the billing and checkout experience: subscriptions, payments, upgrades, failed payments, and single-page checkout
• Translate data, experimentation results, and research into clear product and design decisions
• Frame and prioritize growth hypotheses with your PM/Growth partners and lead the design of experiments
• Lead A/B testing efforts—from hypothesis and design to interpreting results
• Monitor funnels, identify drop-off points, and ship targeted design interventions
• Provide strong upward communication to design and product leadership: clear narratives, trade-offs, and recommendations
• Partner closely with engineers, balancing speed with design quality
• Operate with high autonomy and act as a design leader for the growth area
• Spot opportunities proactively—you take initiative, not just briefs

Lead Product Designer, Growth

Lead Product Designer for Growth at Circle optimizing activation, conversion, and monetization in a fully remote setting. Collaborate across teams to drive impactful product design decisions.

• Leading a small, senior team of engineers to build the discovery feed — the core recommendations engine that powers how consumers find creators, products, and communities that help them grow.
• Partnering closely with Circle’s CEO and co-founders to execute on a vision that redefines discovery in the creator economy.
• Designing, implementing, and iterating on large-scale ML systems, from embeddings and ranking models to experimentation frameworks, to reach product/market fit.
• Owning the technical roadmap for the feed: balancing speed, reliability, and long-term architectural bets.
• Using data, experimentation, and engineering intuition to make fast, high-quality decisions that unlock transformational consumer experiences.
• Obsessing over the craft, quality, and performance of the algorithms that turn Circle Discover into a household name.

Lead Engineer, Discover

Lead Engineer for a discovery marketplace at Circle.so. Building an ML-powered product to help users find creators and communities.

machine-learning-engineer

• Help build the discovery feed — the core recommendations engine that powers how consumers find creators, products, and communities that help them grow.
• Partnering closely with Circle’s CEO and co-founders to execute on a vision that redefines discovery in the creator economy.
• Designing, implementing, and iterating on large-scale ML systems — from embeddings and ranking models to experimentation frameworks — to reach product/market fit.
• Using data, experimentation, and engineering intuition to make fast, high-quality decisions that unlock transformational consumer experiences.
• Obsessing over the craft, quality, and performance of the algorithms that turn Circle Discover into a household name.

Senior Machine Learning Engineer

Senior Machine Learning Engineer building the foundation for Circle's recommendation engine and discovery marketplace. Aiming to enhance users' goals through innovative ML systems.

Circle

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8 jobs found

Senior Full-Stack Software Engineer, Applied AI

Circle

Senior Full-Stack Software Engineer, Growth

Circle

Senior Full-Stack Software Engineer, Payments

Circle

AI Platform Engineer, Applied AI

Circle

Lead Product Designer, Applied AI

Circle

Lead Product Designer, Growth

Circle

Lead Engineer, Discover

Circle

Senior Machine Learning Engineer

Circle