Ruby on Rails Engineer Remote · Brazil · Full-time 🏔️ About Sierra Studio When you apply to Sierra, you join an ecosystem. We specialize in connecting talented Brazilian professionals with exciting career opportunities in a highly-vetted small community of growing companies in the US. Applying to Sierra seamlessly integrates you into this ecosystem, granting automatic eligibility for all relevant opportunities we offer. 💼 About Our Hiring Partner Our hiring partner is a fast-growing, fully bootstrapped SaaS company in the e-commerce space. They build loyalty, memberships, and cash back infrastructure exclusively for Shopify brands — helping online stores increase customer lifetime value and retention. The company is ~20 people, fully remote, and scaling quickly. 🛠️ About the Role As a Ruby on Rails Engineer, you'll work closely with a small engineering team to build and ship features on a Shopify app used by hundreds of brands. This is not a traditional "write code from scratch" role — the team operates a modern AI-assisted engineering workflow. Agentic tools propose plans and write code based on task tickets. Your job is to deeply understand the product and codebase, review and validate AI-generated proposals, catch what doesn't make sense, and ship confidently.

What You'll Do

Review and validate AI-generated code proposals — understand the architecture, catch edge cases, approve or redirect Ship features end-to-end within a Shopify app Triage bugs and tasks; work with agentic coding tools to resolve them Maintain platform stability and code quality Collaborate closely with engineering leadership on product direction Help establish engineering practices as the team grows

What We're Looking For

Strong Ruby on Rails experience, with hands-on Shopify app development Comfort working in an agentic coding environment — you know how to review AI-generated code critically Active GitHub: you've been shipping recently and consistently Familiarity with AI dev tooling (Claude Code, Codex, or similar) is a plus Startup mindset: scrappy, collaborative, no ego Strong written English communication Compensation $5,000–$7,000 USD/month, depending on experience.