• Architect, build, and scale large Ruby on Rails applications
• Own major systems within our Rails API, including performance, reliability, and maintainability
• Manage PostgreSQL at scale: schema design, indexing, performance diagnostics
• Maintain and optimize Redis + Sidekiq pipelines for high-throughput workloads
• Lead backend-heavy feature projects, from design to deployment

AI / LLM Systems:

• Integrate, evaluate, and iterate on LLM providers and models
• Design systems that manage non-deterministic model outputs safely and predictably
• Build and own A/B tests, eval pipelines, and agentic workflows
• Optimize for latency, reliability, and cost across LLM-heavy features
• Contribute directly to prompts, agents, and AI system architecture

Product & Full-Stack Contribution :

• Collaborate tightly with founders and engineers to define product requirements
• Jump into frontend (Next.js/React) when needed to ship features end-to-end
• Run rapid product iterations: fast feedback loops, experimentation, data-driven decisions
• Maintain a high bar for product quality while optimizing for speed of execution

The Ideal You

• You have 5–10+ years of experience building and scaling production Rails applications
• Rails has no secrets for you : you know how to ship quickly and safely
• You are pragmatic: you make thoughtful trade-offs that maximize user value and iteration speed
• You naturally take ownership and thrive in high-velocity environments
• You have recent, hands-on experience with LLMs and already use AI in your day-to-day workflow
• You’re comfortable navigating ambiguity, experimenting, and working with non-deterministic systems
• You can contribute across the stack when needed (backend-first, but not backend-only)
• You deeply care about product quality, speed, and delivering a great user experience

The Alternative You :

If you're still early in your career but see yourself becoming the engineer described above within the next 2–3 years, don’t hesitate. We consistently leave room for raw talent and high potential, especially for people who learn fast, care deeply, and want to grow.

Why Yuma?

• High impact with ownership from day one : join a small, international engineering team where every feature you ship and every solution you design is directly visible in production.
• Competitive compensation based on experience and stock options
• Fast growth = fast learning curve : in this hybrid engineering role, you’ll quickly gain exposure to AI, product iteration, customer workflows, and cross-functional problem-solving
• Work closely with founders and product/engineering leadership : your ideas and your ownership will directly influence the roadmap.
• A culture of ownership, transparency, and continuous improvement : we move fast, iterate constantly, and empower people to grow

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.