Senior Full-stack Engineer, Applied AI

New

Circle.soOnline Communities

We seek exceptional individuals around the world, Collaborate across time zones, are highly asyncFull-TimeSenior

Salary$130,000 - $140,000 USD per year

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Job Details

Languages: Proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5
Experience: 6+ years
Required Skills: PostgreSQLMySQLRuby on RailsReactA/B testing

6+ years experience working as a full-stack engineer on high-traffic production applications.
Strong proficiency in Ruby on Rails, MySQL / Postgresql, and ReactJS.
Hands-on experience building AI features in production (e.g., RAG systems, AI agents, or LLM-powered tools).
Proven experience shipping at least one real AI use case in production.
Strong experimentation mindset with experience designing and running A/B tests and measuring results.
Ability to collaborate effectively in an async, remote-first environment.
Comfortable working in a fast-paced environment with ambiguity.
Proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5.

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.

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