Senior Software Engineer ($160k-$200k + Equity) at Numero

Role Overview

Join Numero as a Senior Backend Engineer to architect backend systems at high scale—supporting millions of daily requests and billions of records. You’ll also help integrate AI agents into the product suite and improve high-volume payment processing.

What You Will Do

• Architect and scale backend systems using Ruby on Rails, Postgres, and OpenSearch.
• Scale the proprietary NumeroQL engine and support high-frequency election traffic.
• Develop and refine “Numero Agents”: AI-powered tools that let clients manage the platform via natural language commands.
• Optimize complex payment processing and fundraising features with strong conversion and accurate compliance reporting across Stripe and PayPal.

Requirements

• 6+ years building and scaling user-facing backend systems.
• Deep, instinctive understanding of production performance and cost.
• Strong SQL and relational data modeling at scale, including indexing and bottleneck management.
• Clear bias toward high-quality architectural patterns.
• Eagerness to push forward AI-integrated engineering workflows (e.g., Cursor).

Nice to Have

• Experience integrating LLM-powered product features and/or agentic workflows.