Senior Full Stack / Rails Engineer, Yuma AI

AI Product Focus

Salary not provided

+ Stock options

React

Redis

Sidekiq

Postgres

Next.js

Rails

Ruby on Rails

Senior and Expert level

Boston

Automated customer service for eCommerce brands

Open for applications

Automated customer service for eCommerce brands

21-100 employees

B2BArtificial IntelligenceCustomer serviceSaaSAutomation

Open for applications

Salary not provided

+ Stock options

React

Redis

Sidekiq

Postgres

Next.js

Rails

Ruby on Rails

Senior and Expert level

Boston

21-100 employees

B2BArtificial IntelligenceCustomer serviceSaaSAutomation

Company mission

To redefine customer experience with cutting-edge AI.

Job

Company

Role

Who you are

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

What the job involves

This is a foundational role
You will be joining Yuma as one of the core engineers on a tight, high-performing team of 5
We move fast, iterate aggressively, and care deeply about product quality and user value
Over the past two years, we’ve built an impressive amount of product surface area, AI systems, and automation
Yet what lies ahead is even bigger
As we scale our platform, models, and AI agents, your work will have a direct and immediate impact on the experience of thousands of users
This role goes far beyond classical backend development
You will work across the full product lifecycle: new features, A/B tests, model integrations, AI agent pipelines, and performance optimization
If you enjoy working at the intersection of backend engineering, product iteration, and applied AI, you will thrive here
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

Our take

Yuma AI is transforming eCommerce customer support with its AI-driven automation solutions. By integrating advanced AI agents into platforms like Shopify, Yuma enhances productivity, reduces operating costs, and improves customer satisfaction.

The platform stands out for its ability to generate human-like interactions, mirroring brand tone and boosting operational efficiency. This has proven a success and the platform is rapidly increasing ticket automation rates and reducing response times.

In its pursuit of continued growth, Yuma has closed a successful Seed funding round. With this capital, the platform aims to expand its capabilities and further revolutionize eCommerce customer support.

Freddie

Company Specialist at Welcome to the Jungle

Company

Funding (2 rounds)

Nov 2024

$5m

SEED

Mar 2023

$0.2m

SEED

Total funding: $5.2m

Company HQ

SoMa, San Francisco, CA

Leadership

Guillaume Luccisano

(Founder & CEO)

Previously co-founded Triplebyte where they served as CTO for 6 years. They also co-founded Socialcam where they served as the VP of Engineering for 3 years.

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