Senior Full-Stack Software Engineer, Applied AI

🕒 Março 27

🇺🇸 Estados Unidos – Remoto (EUA)

💵 $130.000 - $140.000 / ano

⏰ Tempo Integral

🟠 Sênior

🧑‍💻 Engenheiro Full-stack

🦅 Patrocina Visto H1B

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Circle

SiteLinkedInTodas as Vagas

1001 - 5000 funcionários

Fundada em 2013

🔥 Investimento no último ano

💰 $1.000.000.000 Post IPO secondary em 2025-09

Construindo a Plataforma Financeira da Internet — impulsionada por USDC, Arc e Circle Payments Network.

Descrição

• 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.

🎯 Requisitos

• 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.

🏖️ Benefícios

• 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.