Join Numero as a Senior Backend Engineer to architect systems handling millions of daily requests and billions of records. You will scale our proprietary NumeroQL engine, integrate advanced AI agents into our product suite, and optimize high-volume payment processing. It’s a high-impact role building the infrastructure that powers consequential national campaigns.
Senior Software Engineer at Numero
Join Numero, the YC-backed platform powering the fundraising infrastructure for the country’s most consequential political campaigns and nonprofits. You'll work at the cutting edge of AI-integrated engineering, building agentic tools and scaling high-performance database queries in a remote-first, high-impact environment. If you want to ship code that moves the needle for mission-driven organizations while pushing the boundaries of AI-native development, we want to hear from you.
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Location
Remote (United States)
Compensation
$160k-$200k + Equity
Company
Numero
Role overview
At Numero, we build software for political campaigns and nonprofits. We were founded in 2019 (after our founders met while working together on a Congressional race) with the goal of building a modern fundraising software suite from the ground up – one that users actually want to use. In that time, we’ve scaled our platform to serve thousands of clients ranging from city council seats to US Senate races, and have helped them collectively manage over $10B in contributions.
Our platform is an all-in-one system comprised of a donor CRM, a broadcast email/text tool, and payment processing pages that our clients rely on for their work every day. We’re small, tight-knit team that has deep experience in this space and are backed by world class investors including 776, Y Combinator, and Initialized Capital.
What you will do
- Architect and scale backend systems using Ruby on Rails, Postgres, and OpenSearch to support billions of records and high-frequency election traffic.
- Develop and refine Numero Agents, a suite of AI-powered tools that allow clients to manage their platform using sophisticated natural language commands.
- Optimize complex payment processing and tandem fundraising features, ensuring high conversion and precise compliance reporting across Stripe and PayPal.
Who this is a fit for
- Possesses 6+ years of experience building and scaling user-facing backend systems with a deep, instinctive understanding of production performance and cost.
- Demonstrates high proficiency in SQL and relational data modeling at scale, with experience managing bottlenecks and indexing in high-volume environments.
- Maintains a bias toward high-quality architectural patterns and is eager to push the frontier of AI-integrated engineering workflows using tools like Cursor.
Why this role is remarkable
- Work on mission-critical systems where your code directly impacts thousands of campaigns and helps raise billions of dollars for important causes.
- Join a high-growth, YC-backed team with top-tier investors like 776 and Initialized Capital, operating at a scale few startups ever reach.
- Be at the forefront of AI-native development, utilizing agentic coding workflows and building LLM-powered features like Numero Agents on a proprietary Ruby stack.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Numero wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.