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

Role Overview

Join Numero as a Senior Backend Engineer to architect and scale mission-critical systems that handle millions of daily requests and billions of records. You’ll scale the proprietary NumeroQL engine, integrate AI agents into the product suite, and optimize high-volume payment processing.

What You’ll Do

• Architect and scale backend systems using Ruby on Rails, PostgreSQL, and OpenSearch.
• Develop and refine Numero Agents, AI-powered tools enabling clients to manage the platform via natural language commands.
• Optimize payment processing and tandem fundraising features to ensure:
  • high conversion
  • precise compliance reporting across Stripe and PayPal.

Requirements

• 6+ years building and scaling user-facing backend systems.
• Strong instinct for production performance and cost.
• High proficiency in SQL and relational data modeling at scale, including handling bottlenecks and indexing in high-volume environments.
• Strong architectural judgment and preference for high-quality patterns.
• Eagerness to push AI-integrated engineering workflows (e.g., Cursor).

Nice-to-Haves

• Experience building or integrating LLM-powered features and agentic tooling.
• Familiarity with OpenSearch and large-scale search/analytics infrastructure.