Ruby Engineer

Smartscale; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Smartscale seeks a backend engineer skilled in Ruby on Rails to join Candy.ai’s remote, high-traffic production environment. You’ll own critical backend components, scale services, and leverage AI tools in daily workflows.

A startup mindset and strong ownership are essential for fast, decisive product decisions. Ideal candidates have 5+ years of Rails experience, thrive in high-traffic, production-grade environments, and are comfortable with NSFW content.

Qualifications

• 5+ years of backend engineering experience with Ruby on Rails in production.
• Experience building high-traffic, production-grade systems.
• Active use of AI tools (e.g., ChatGPT, Copilot) in development.
• Comfortable working in a startup environment with ambiguity and fast iteration.
• Must be able to work within CET ±3 for timezone overlap.

Skills

Backend engineering

Ownership & initiative

AI tool usage

Startup mindset

Timezone overlap

Tools

Ruby on Rails

Job description

Join a fully remote, cross-functional engineering team working on Candy.ai, one of the world's leading AI companion platforms. This role requires engineers who are 100% comfortable with NSFW/explicit content and thrive in a high-traffic, production-grade environment. Ownership and initiative are highly valued, with immediate product consequences for engineering decisions.

NSFW Comfort 100% comfortable with NSFW/explicit content as part of daily work.

Ruby on Rails Experience 5+ years of backend engineering experience with Ruby on Rails in production. Strong web fundamentals, comfortable working at scale. Production backend work at scale was their daily reality.

High-traffic Systems Experience with high-traffic, production-grade systems serving millions of users. Monolithic architecture and/or scaling challenges.

AI Tool Usage Actively use AI tools (e.g., ChatGPT, Copilot, Cursor) in their development workflow.

Startup Mindset Comfortable in a startup environment: ambiguity, fast iteration, direct communication. Ownership expected, takes initiative and makes decisions.

Timezone Overlap Must be able to work within CET ±3.