Circle · 9 hours ago
Senior Full-Stack Software Engineer, Applied AI New
United States
Full-time
Remote
Senior Level
$130K/yr - $140K/yr
6+ years expCircle is building the world’s leading all-in-one platform for online communities. They are seeking a Senior Full-Stack Software Engineer to develop full-stack AI solutions leveraging large language models, focusing on projects such as AI agents and infrastructure for LLM inference.
BankingBlockchainCryptocurrencyFinancial Services
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
Qualification
Required
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
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!
Paid time away: all employees are given 35 days of PTO annually. We also offer a paid sabbatical after 5 years.
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!
Company
Circle
Circle helps businesses and developers utilize stablecoins for payments and online commerce.
1001-5000 employees
H1B Sponsorship
Circle has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (32)
2024 (41)
2023 (43)
2022 (25)
2021 (4)
2020 (2)
Funding
Current Stage
Public CompanyTotal Funding
$2.44BKey Investors
ARK Investment ManagementCoinbaseAlameda Research
2025-11-19Post Ipo Secondary· $17.7M
2025-08-14Post Ipo Secondary· $1.04B
2025-08-14Post Ipo Equity· $260M
Leadership Team
Jared Favole
Chief of Staff to CEO
Jeremy Allaire
Co-Founder, Chairman and CEO
Recent News
2026-02-06
2026-02-06
2026-02-06
Company data provided by crunchbase