Senior Software Engineer - Finance & Business Systems

About the Company A profitable, fast-growing SaaS platform in the mission-driven technology space, backed by a leading accelerator and a recent $140M growth investment. The company facilitates hundreds of millions in transactions annually and is on track to cross $100B in total volume over the next decade. With 130+ employees distributed across 30+ states and a $100M AI product investment underway, this is a company operating at meaningful scale with significant runway ahead. Remote-first role based in the US . Team members are expected to attend multiple company-wide and team-specific on-sites throughout the year. Contract to Hire after 3 months. Sponsorship not available. The Role This is not a traditional product engineering role. It is a deeply business-embedded engineering position at the intersection of Finance, Engineering, and Operations. The hire will build the systems and instrumentation that make unit economics visible, trustworthy, and actionable - working in close partnership with Finance, Operations, and Engineering leadership rather than from a standard product roadmap. Ideal for a Rails engineer who wants to apply strong technical skills to real operational problems and who is motivated by business impact, not just feature delivery. Responsibilities Own full-stack delivery from UI to backend services, including database tuning and performance Build new features start to finish - architecture design, coding, automated testing, and production support Work closely with teammates in a fast-paced, agile environment across pods and the broader Engineering org Tackle technical issues throughout the stack and contribute to shared documentation Contribute to coding standards, tech debt refinement, and system security monitoring Participate in interviewing and onboarding new team members Participate in on-call support rotation (team-based, paired) What They Are Looking For Strong experience with Ruby on Rails System design experience focused on incremental, scalable, resilient architecture Comfortable across the stack - backend services, databases, and light frontend Experience with modern frontend frameworks (React, Vue.js) SQL database experience (PostgreSQL, MySQL, SQLite) Deployment experience on Heroku, AWS, or similar 5+ years of hands-on development experience Comfort with financial concepts: margins, COGS, pricing, revenue recognition, or unit economics Experience building systems where correctness, auditability, and explainability matter Ability to work with non-technical stakeholders and translate ambiguous business questions into concrete technical work Comfortable with ambiguity - shaping the problem, not just executing against a spec BONUS Deep Ruby on Rails and RSpec expertise Postgres database administration experience Shipped code supporting tens of thousands of users including enterprise customers Operations/SRE experience including networking, caching, database, and performance triage Experience in fundraising, crowdfunding, fintech, or payments products Startup environment experience Experience building internal tools for Finance or Operations teams Compensation The base pay range for this role is $150,000 – $190,000 per year.