Responsibilities
- 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.
Requirements
- 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.
Benefits
- Fully remote: work from anywhere in the world!
- Autonomy and trust to do your job: we care about outcomes over everything else.
- Paid time away: all employees are given 35 days of PTO annually. We also offer a paid sabbatical after 5 years.
- Generous U.S. benchmarked compensation and startup equity no matter where you are in the world.
- Awesome medical coverage with 100% coverage for you and your family, or medical reimbursement options where applicable!
- Parental leave for parents expanding their family, or just starting one.
- Home office stipend to help you get up and running.
- Learning & development stipend to help you level up your professional skills.
- Annual bonus potential for roles that don't already receive variable income or commission.
- Company retreats: Twice a year, the Circle team gets together for a fully paid company retreat in incredible places around the world! We’ve had past retreats in Colombia, Portugal, and Mexico, with more planned on the horizon.
Work Arrangement
Remote (Worldwide)
Team
Team size: around 200 (and growing!) team members from 30+ countries around the world
Additional Information
- The safety and trust of our candidates is extremely important to us. Unfortunately, recruiting fraud is increasingly common in the job market, and bad actors sometimes impersonate companies or employees. To help protect you, here’s what you can expect from our hiring process: How Our Process Works - All applications are submitted through our official applicant tracking system (Greenhouse). - If selected to move forward, you may be invited to record a short introductory video, or directly into a live interview. - All live interviews are conducted face-to-face over video (Zoom or Google Meet) with a member of the Circle team. - We do not conduct text-only interviews. - We do not conduct interviews via chat apps or messaging platforms. - We do not use AI bots to interview candidates. Official Communication Channels - All official communication from Circle will come from no-reply@us.greenhouse-mail.io, or an email address ending in @circle.co or @circle.so. - We will never contact you from unofficial domains (such as “.team”, “.careers”, or similar variations). - We will never request sensitive personal information early in the process, or ask for payment of any kind. If you receive a suspicious message claiming to be from Circle, please do not respond. We appreciate your vigilance, and look forward to connecting with you through our official channels.
- As a fully-remote international company, diversity is baked into our DNA. Here’s how our CEO, Sid Yadav, frames our hiring mission: “let’s find talent in underserved and under-represented corners of the world, set them up to do the best work of their lives, and in turn, change their life.” To achieve this hiring mission, we offer competitive U.S. benchmarked compensation no matter where someone’s located in the world, and we proactively seek candidates who expand representation of backgrounds, cultures and lived experiences in our teams.
- Circle is an equal opportunity employer and as such, we do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or any other characteristic protected by applicable laws. If you require any accommodations during the recruitment process, please let us know and we will work with you to meet your needs.
- At Circle, we are committed to protecting your personal information. As a job applicant, the personal data you provide to us is collected and processed in accordance with the General Data Protection Regulation (GDPR) in the EU and the California Consumer Privacy Act (CCPA). This notice outlines the types of personal information we collect, the purpose for collecting it, and your rights. Information We Collect: We collect the following categories of personal information from job applicants: - Contact information (such as name, email address, phone number) - Employment history and qualifications - Education history - References and any other information you choose to share with us during the application process Purpose of Collection: We collect this information for the following purposes: - To assess your qualifications and suitability for the position - To communicate with you during the recruitment process - To comply with legal and regulatory obligations Your Rights Under GDPR and CCPA: You have the following rights regarding your personal information: - The right to request access to the personal information we hold about you. - The right to request the deletion of your personal information, subject to certain legal exceptions. - The right to opt out of the sale of your personal information (Note: We do not sell personal information). For more information about how we handle your personal data or to exercise your rights, please refer to our full By submitting your application, you acknowledge that you have read and understood this privacy notice.
