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Yuma AI (YC W23) · 4 weeks ago

AI Product Focus - Senior Full Stack / Rails Engineer (Boston)

Boston, MA, US

Full-time

Onsite

Senior Level

$100K/yr - $150K/yr

6+ years exp

Yuma AI is a leading company in the AI Support Automation space, focused on building a next-generation orchestration platform for customer support in e-commerce. They are seeking a Senior Full Stack / Rails Engineer to join their core engineering team, where the role involves architecting and scaling Ruby on Rails applications, managing AI systems, and contributing to product development across the full stack.

Artificial Intelligence (AI)Customer ServiceE-CommerceGenerative AISoftware

No H1B

Responsibilities

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

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

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

Qualification

Ruby on RailsPostgreSQLRedisReactAI/LLM experience

Required

6+ years of experience

Experience building and scaling production Rails applications

Hands-on experience with LLMs and AI in day-to-day workflow

Ability to contribute across the stack when needed

Strong understanding of Ruby on Rails applications

Experience with PostgreSQL at scale: schema design, indexing, performance diagnostics

Experience maintaining and optimizing Redis + Sidekiq pipelines

Ability to architect, build, and scale large Ruby on Rails applications

Ability to manage performance, reliability, and maintainability of Rails API

Ability to collaborate tightly with founders and engineers to define product requirements

Ability to run rapid product iterations and maintain a high bar for product quality

Preferred

5–10+ years of experience

Pragmatic approach to making thoughtful trade-offs that maximize user value and iteration speed

Comfortable navigating ambiguity and experimenting with non-deterministic systems

Ownership mentality and ability to thrive in high-velocity environments

Benefits

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