Senior Full-Stack Engineer, Applied AI
Circle
MySQLPostgresReactRubyRuby on Rails
Lead Engineer, CMS Builder
Circle
full-time
Posted on:
Location Type: Remote
Location: Remote • 🌎 Anywhere in the World
Visit company websiteSalary
💰 $160,000 - $170,000 per year
Job Level
Senior
Tech Stack
KafkaPostgresRubyRuby on Rails
About the role
- Leading development of high-scale backend systems that power our new website builder experience.
- Collaborating closely with product, design, and leadership to shape what we build and how we build it.
- Shipping thoughtful, high-quality code—balancing speed with care.
- Mentoring, guiding, and building out a globally distributed team of engineers, while leading by example.
- Owning end-to-end project execution—from early technical planning through delivery.
- Driving performance optimizations and architectural improvements where milliseconds matter.
- Designing and analyzing A/B tests to validate changes and improve the product.
- Engaging regularly with stakeholders to align on priorities and technical direction.
Requirements
- 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.
- 8+ years of experience in full-stack or backend-heavy development, with deep knowledge of Ruby on Rails and supporting technologies (e.g. Sidekiq, Kafka, Postgres).
- Experience building performant applications at scale—you're mindful of load time, bottlenecks, and architectural trade-offs.
- 3+ years of experience leading or mentoring engineers in high-growth, fast-paced environments.
- Clear, confident communicator who can align technical and non-technical stakeholders.
- Strategic thinker who can also dive into the weeds and own execution end-to-end.
- Self-starter who thrives in a remote, async-first culture and takes initiative without waiting for permission.
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.
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard skills
Ruby on RailsSidekiqKafkaPostgresA/B testingperformance optimizationbackend developmentfull-stack developmentarchitectural improvementsproject execution
Soft skills
mentoringcommunicationstrategic thinkingself-startercollaborationleadershipproblem-solvinginitiativealignmentconfidence
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