Backend Engineer (Ruby on Rails / PostgreSQL / LLM Pipelines), Product Testing Data
Sierra Studio · Remote · Brazil (Remote) ·
COMPENSATION
€•• – ••k
Listed on the employer's job board (Ashby)
- Fully remote
- Ruby on Rails
- LLM & Data Pipelines
- Early-stage startup
- 4+ years experience
Join an early-stage US startup transforming product testing by turning unstructured PDF reports into structured, comparable data. As a backend engineer, you will deepen core data pipelines, improve extraction accuracy, and build agentic workflows that help brands verify compliance and share transparent product information.
What you'll do
- Improve extraction pipelines converting PDFs to structured records using document AI and LLMs
- Build validation layers to catch and correct errors in compliance-critical data
- Create taxonomies for unit normalization and method equivalence across different labs
- Enable cohort analysis by comparing data across suppliers, products, and categories
- Design data models that serve diverse audiences without schema forking
- Build agentic workflows with verified outputs and auditable conclusions
What you'll need
- 4+ years of backend engineering experience with strong Ruby on Rails proficiency
- Deep expertise in PostgreSQL and complex data modeling
- Experience building ingestion pipelines for messy, uncontrolled external data sources
- Strong analytical rigor to determine statistical significance for customer actions
- Production experience with LLM or agentic APIs and handling non-deterministic outputs
- Comfort working autonomously in early-stage, high-growth startup environments
Nice to have
- Experience with analytical data stores like ClickHouse, BigQuery, or Snowflake
- Familiarity with Turbo (Hotwire) and Tailwind CSS
- Background in other backend stacks if accompanied by exceptional engineering skills
Stack
- Ruby on Rails
- PostgreSQL
- ClickHouse
- Claude API
- Reducto
- Turbo
- Tailwind
How you'll work
- Fully remote position
- US-based startup ecosystem
- Early-stage team environment