Hellotext is the next-generation AI platform for eCommerce growth. Brands use Hellotext to power AI Playbooks that recover carts, re-engage customers, automate support, and send highly personalized WhatsApp/SMS campaigns.

We’re growing fast and we need a Senior Rails Engineer who can own complex integrations, scale our systems, and ship features that directly impact tens of millions of messages every month.

If you love:

Rails architecture
Hotwire/Turbo/Stimulus
High-volume integrations
Scaling data pipelines & jobs
Building product, not ticket factories

…then you will love this role.

What You’ll Do

As a Senior Full-Stack Ruby on Rails Developer you will:

1. Own integrations end-to-end

You’ll build and maintain the APIs and webhooks that power our automation engine:

Shopify, Woocommerce, Tiendanube, VTEX, Magento, Salesforce.
ERPs Integrations
MercadoLibre customers & orders
Meta (WhatsApp), AppsFlyer, attribution partners
Payment and billing integrations
Event ingestion for abandoned carts, purchases, inventory, returns, etc. ⠀ ### 2. Build and scale core product features You’ll work closely with Founder + Product to deliver new features

3. Build clean, reactive UI with Hotwire

No React. No SPAs. Pure Rails with:

Turbo Streams
Stimulus controllers
Tailwind CSS
Real-time updates (Inbox, Playbook stats)
Seamless multi-step wizards

4. Architect for performance and scalability

You’ll improve and scale the systems behind:

High-throughput message delivery (WhatsApp/SMS/IG/WA Cloud API)
Async processing (Sidekiq queues, concurrency tuning)
Webhooks ingestion at high volume
Caching strategies (Redis, DB read optimizations)
Reliable background processing & backpressure control
Database performance: indexing, partitioning strategies, slow query reductions
Horizontal scaling via Kamal + containers

5. Work side-by-side with our AI team

You don’t need to be an “AI engineer” but you’ll help wire the backend so these systems run flawlessly.

What Makes This Role Special

You ship features deeply used by big LATAM retailers and thousands of merchants
You will shape the foundation of the entire platform
You work directly with the founder, not layers of management
You never get bored — every week new integrations, new playbooks, new UX
You join a tiny team with massive leverage
You get to work with one of the most advanced AI architectures in eCommerce

This is not a corporate Rails job, this is the kind of role where your code is powering millions of messages, automations, and purchases every single day.

Our Tech Stack

Ruby on Rails, Hotwire (Turbo + Stimulus), Tailwind CSS, PostgreSQL, Redis, Sidekiq, Kamal (deployments), AWS & Hetzner, OpenAI.

Who You Are

You are a senior generalist who cares about shipping great products and solving real problems.

Core

5+ years of Ruby on Rails
Deep experience with API integrations and event-driven systems
Strong Hotwire/Turbo/Stimulus skills
Comfortable building product end-to-end
Superb debugging skills
Sidekiq mastery (queues, retries, concurrency, backpressure)
Experience maintaining systems that require high uptime

Scaling Experience (Required)

You’ve scaled Rails apps under high load
Designed & optimized background job pipelines
Handled webhook storms, retries, and burst traffic
Improved database performance (indexes, slow queries, partitioning)
Tuned Redis caching layers
Built or maintained multi-node environments
Familiar with rate limiting, idempotency, and reliability patterns
Understand messaging system bottlenecks (WhatsApp/SMS throughput, fan-out jobs)

Nice-to-haves

Experience with Shopify/VTEX
Understanding of LLM-based systems or AI agents
Familiarity with APM tools (New Relic, AppSignal, Datadog)
Interest in product design and merchant experience

Location

Latin America preferred (Uruguay, Colombia, Ecuador, Argentina, Brazil, Peru).
But we hire globally for the right candidate.