Senior Software Engineer (Backend)
Numero
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About this role
Build the backend that powers modern political fundraising infrastructure
Numero is building a modern platform for political fundraising, donor engagement, and campaign communications. As a Senior Software Engineer (Backend), you will help design and scale the systems that power donations, outreach, and automation for campaigns and nonprofits that need dependable technology.
This role sits at the intersection of backend infrastructure, product experience, and real-world impact. You will build scalable APIs, improve distributed systems, and create the reliability needed to support high-volume donation processing and time-sensitive communication flows.
At a glance
Salary
$160k–$200k
Workplace
Remote (United States)
Experience
Senior Level
About Numero
A startup building software that helps campaigns and nonprofits move faster
Numero is a small but ambitious startup building a fundraising technology platform for modern political organizations and nonprofits. The company was founded by operators who understood the pain points of grassroots fundraising, donor engagement, and campaign communication work.
The mission is straightforward: create software that helps organizations raise money and communicate more effectively without relying on fragmented tools or outdated workflows. The team combines product thinking with technical depth to create a cohesive experience for fundraising teams.
At the center of the platform is a donor CRM, a communications layer for email and SMS outreach, and a payments stack that helps organizations process contributions securely and at scale. The engineering work is deeply connected to product reliability and the speed of everyday fundraising campaigns.
Numero operates with a remote-first culture that favors clear communication, thoughtful ownership, and fast execution. Its small startup environment means every engineer has real influence over architecture, product choices, and the company’s technical direction.
The company is backed by Y Combinator and has the support of experienced investors who believe in the long-term opportunity to reshape how organizations engage supporters. That backing creates room for growth while preserving a thoughtful, mission-driven team culture.
For engineers, Numero represents a chance to join early, contribute broadly, and build software that directly supports democratic participation, advocacy, and community-led action.
Core responsibilities
Own critical backend systems and help the product scale
Design scalable backend services that power fundraising workflows and donor engagement systems.
Build and evolve APIs for integrations with payment processors, CRMs, and messaging platforms.
Improve system architecture for high-volume donation processing and real-time reliability.
Optimize performance, observability, and cloud infrastructure for low-latency experiences.
Collaborate closely with founders to ship production-ready features with measurable product impact.
Review code, mentor engineers, and raise the bar for quality across the engineering organization.
Required skills
Technical breadth that matches a high-growth startup
Preferred qualifications
- Senior backend engineering experience building mission-critical products at scale.
- Experience creating robust products for high-growth startups or demanding technical environments.
- Comfort with cloud platforms, modern frameworks, and database optimization techniques.
- A high ownership mindset with strong collaboration, communication, and shipping discipline.
Why join Numero?
A rare opportunity to shape a real product from the inside
Competitive Salary
Compensation designed to reward senior technical leadership and impact.
Fully Remote
Work from anywhere in the U.S. with a high-trust remote-first culture.
Small Team
Join a lean, collaborative team where your ideas move quickly from concept to launch.
High Ownership
Take ownership of architecture and product decisions from day one.
YC-backed Startup
Build with a company backed by Y Combinator and experienced operators.
Direct Founder Collaboration
Partner directly with founders on key technical and product decisions.
Modern Tech Stack
Work with modern tooling and infrastructure used to support high-traffic products.
Real Product Impact
Your work shapes the experience of campaigns and nonprofits nationwide.
Fast Career Growth
Grow quickly as the company expands its platform and customer footprint.
Flexible Work Environment
Work on a schedule that supports focus, balance, and sustainable delivery.
Benefits
The environment is designed for focused engineering and growth
Remote Work
Competitive Compensation
Flexible Schedule
Learning Opportunities
Startup Equity (if applicable)
Modern Engineering Culture
Career Development
Small Collaborative Team
Hiring process
A thoughtful, modern hiring experience
Submit Application
Submit your application and share your experience with the team.
Resume Review
The team reviews your background and experience for a strong fit.
Recruiter Call
A recruiter conversation helps clarify the mission, scope, and expectations.
Technical Interview
A technical screen evaluates your systems thinking and engineering depth.
Coding Assessment
A coding assessment highlights how you approach design and execution.
Final Interview
A final discussion covers product thinking, ownership, and long-term fit.
Offer
Successful candidates receive a thoughtful offer and next steps.
Onboarding
You join the team and start contributing with clarity, support, and momentum.
Salary information
Position
Senior Software Engineer (Backend)
Salary
$160,000–$200,000/year
Salary may vary depending on experience, interview performance, and final offer.
About remote work
A remote-first engineering culture built on trust and momentum
Remote-first culture
The company operates with a remote-first mindset that values thoughtful communication, documentation, and shared accountability.
Collaboration
The team uses asynchronous collaboration to keep work moving while staying connected through regular planning and feedback loops.
Ownership
Engineers are trusted to own delivery from planning through deployment, which creates room for initiative and growth.
Work-life balance
A flexible environment helps engineers stay productive while maintaining healthy schedules and sustainable focus.
Frequently asked questions
Everything you need to know before applying
Is this position fully remote?+
Yes. This role is fully remote within the United States, with a remote-first operating model built around asynchronous collaboration and clear ownership.
What is the salary?+
The salary range is $160,000–$200,000 USD per year, depending on experience, interview performance, and the final offer.
Who can apply?+
We welcome applicants with strong backend engineering experience, a history of shipping reliable systems, and a willingness to work in a fast-moving startup environment.
What technologies are used?+
The company works with modern backend systems, cloud infrastructure, and tools designed for reliability, scale, and product velocity.
Is sponsorship available?+
Visa sponsorship availability may vary based on timing and business needs. Please contact the hiring team for the latest guidance.
Does Numero hire internationally?+
The role is focused on the United States, but the company may consider broader talent needs across future opportunities depending on the hiring plan.
What experience is required?+
Candidates should bring senior-level backend experience, strong systems thinking, and a track record of building software that powers high-growth products.
How long does hiring take?+
The process typically spans several weeks, including application review, recruiter outreach, technical interviews, and a final discussion with the team.
What benefits are offered?+
Benefits include remote-first work, competitive compensation, learning opportunities, and the chance to join a highly collaborative startup team.
How do I apply?+
Use the official Y Combinator application link at the top of this page to submit your application directly.
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Ready to build
Ready to build software that makes an impact?
Join Numero and help build modern fundraising technology used by thousands of political campaigns and nonprofits.