Job Description
Circle is building the world’s leading all-in-one platform for online communities. We make it possible for creators coaches educators and businesses to bring together their audience with engaging discussions live streams events chat courses and payments — all in one place all under their own brand.
We’re proud to be a fully remote company of around 200 (and growing!) team members from 30+ countries around the world. We seek exceptional individuals around the world set them up to do the best work of their lives and in turn create a meaningful impact in their own lives. We don't track hours but we do manage for high expectations very closely. We collaborate across time zones are highly async and like to document a lot.
Twice a year we bring the whole company together in beautiful places around the world for our company offsites. So far we’ve hosted offsites in Turkey Portugal Mexico Thailand Colombia Italy Ireland and more with still more to come!
Check out our Careers page for more about working at Circle.
The Applied AI team at Circle is at the forefront of leveraging AI to drive innovation for our customers through transformative applications of large language models (LLMs).
We're looking for a strong full-stack engineer who is proficient in web frameworks backend development and infrastructure to spearhead the development of full-stack AI solutions across Circle. You will work on exciting projects such as AI agents Retrieval-Augmented Generation AI evaluations and observability and building infrastructure for LLM inference.
While deep AI specialization or expertise isn't required we care about some hands-on experience building AI features. Beyond that we’re looking for a strong experimentation mindset. If you're excited about rapidly testing ideas running A/B experiments and iterating on real production use cases of LLMs this role is for you.
The Applied AI team is composed of different backgrounds. Some team members joined with deep Rails experience and solid AI fundamentals while other team members joined with deep AI experience and ramped up on Rails. Either path works as long as you bring hands-on experience with both Rails and AI and have genuine curiosity to grow.
What you'll be doing- 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.
- 6+ years experience working as a full-stack engineer on high-traffic production applications. You've dealt with the challenges that come with scale — query optimization careful migrations performance bottlenecks.
- Strong proficiency in Ruby on Rails MySQL / Postgresql ReactJS. Familiarity with both frontend and backend is necessary but a high degree of proficiency in both is not a requirement.
- Hands-on experience building AI features in production — whether RAG systems AI agents or LLM-powered tools. You've shipped at least one real AI use case not just prototypes.
- Strong experimentation mindset — you’re comfortable designing and running A/B tests measuring results and iterating quickly to discover what works and what doesn’t.
- A desire to work in an environment which values speed of iteration and individual autonomy while also embracing personal accountability and the ability to collaborate effectively as part of a dynamic team.
- Comfortable in a fast-paced environment with a certain level of ambiguity especially when learning and picking up new technologies when projects require it.
- 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.
Circle offers U.S.-benchmarked compensation globally equity in the company with ongoing refresh grants and 35 days of paid time off each year.
We’re a remote-only team that comes together twice a year for company retreats in incredible destinations around the world. Alongside incredible flexibility and autonomy we offer a benefits package that supports health wellbeing and professional growth. Learn more in our Candidate Hub.
- Candidate Safety & Interview Process Notice
- Diversity Equity & Inclusion
- How We Use Candidate Data
- Equal Employment Opportunity
- Visit our Candidate Hub to learn more about working at Circle our benefits and our hiring process.
Skills Required
- 6+ years experience as a full-stack engineer on high-traffic production applications
- Strong proficiency in Ruby on Rails
- Strong proficiency in MySQL / PostgreSQL
- Strong proficiency in ReactJS
- Hands-on experience building AI features in production (e.g. RAG AI agents LLM-powered tools)
- Experience designing and running experiments and A/B tests
- Proficient English (CEFR C2 / ILR Level 5)
- Experience building or integrating LLM inference infrastructure and AI observability (performance/reliability)
- Familiarity with AI evaluations and experimentation mindset
Circle (circle.so) Compensation & Benefits Highlights
- Fair & Transparent Compensation—Pay is positioned as U.S.-benchmarked globally with explicit salary bands in postings annual cash-comp reviews and equity including refresh grants. This structure is repeatedly described in Circle’s own materials and current role listings.
- Leave & Time Off Breadth—Time off is described as generous with 35 days of PTO per year and the ability to carry over a portion with paid sabbaticals noted after longer tenure. This figure is reiterated across Circle’s postings and employer profiles.
- Healthcare Strength—U.S. healthcare is presented as fully employer‑paid family medical coverage where available alongside dental and vision. Mental health benefits are also referenced with plan or reimbursement mechanisms depending on location.
Circle (circle.so) Insights
What We Do
Circle is the AI-powered home for your community.From a branded website to discussions courses events payments email marketing AI agents and more Circle gives you everything you need to build and scale your community-led business.
Why Work With Us
We're a fully remote company distributed across 30+ countries. We don't track hours but we do manage for high expectations very closely. We collaborate across time zones are highly async and like to document a lot. Twice a year we bring the whole company together in beautiful places around the world for our company offsites.
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Date Posted
07/10/2026
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