Senior Software Engineer
About The Position
Our client is building AI agents that automate accounts receivable for enterprise companies. The company replaces one of the most manual and operationally painful back-office workflows with AI-native software that improves collections, invoicing, reconciliation, and cash flow operations. Founded in 2023 by Harvard and MIT alumni, the company is backed by Y Combinator and Gradient (Google's AI venture arm) and recently raised a $17M Series A. The company is still early enough for engineers to have foundational ownership while already demonstrating strong traction, enterprise demand, and rapid scaling momentum. The platform combines: AI-powered accounts receivable automation, Invoice orchestration, Collections workflows, Cash application systems, ERP integrations, Event-driven backend infrastructure, Full-stack fintech applications, Enterprise workflow automation, Data reconciliation systems, Operational finance tooling. Engineering challenges involve building reliable fintech systems, event-driven architectures, full-stack product experiences, scalable APIs, safe database migrations, observability, and automation infrastructure for enterprise finance teams. The culture values ownership, speed, engineering excellence, autonomy, mentorship, and building software that directly impacts customer operations and revenue cycles.
Requirements
- 5+ years of experience in full-stack software engineering
- Experience at early-stage startups, ideally sub-30 employee environments
- Experience scaling B2B SaaS products from early users to meaningful ARR
- Strong proficiency in TypeScript across frontend and backend systems
- Experience with Node.js, Next.js, React, Prisma, and modern web stacks
- Experience building and operating event-driven systems
- Strong system design and architecture skills
- Experience owning products or major features end-to-end
- Strong software engineering fundamentals
- Ability to operate independently with minimal direction
- Experience mentoring engineers through code review and design review
- Comfortable working across frontend, backend, infrastructure, and data layers
- Experience building enterprise SaaS or fintech products preferred
- Degree from a top-tier CS program preferred
- Strong startup mindset and ownership mentality
Nice To Haves
- Founding Engineer or early engineering team experience
- Experience at YC-backed or high-growth VC-backed startups
- Experience at companies like Stripe, Plaid, Brex, Mercury, Datadog, Airbnb, or similar engineering cultures
- Strong TypeScript and React expertise
- Deep Node.js backend experience
- Experience with Prisma, MySQL, and schema migrations
- Experience with event-driven tools such as Inngest or Temporal
- Fintech, payments, AR/AP, or enterprise finance domain experience
- Track record of scaling B2B SaaS systems in production
- Demonstrated architectural ownership in small, high-performing teams
- Experience improving engineering standards, observability, and operational maturity
- Strong mentoring and technical leadership capabilities
- Ability to thrive in ambiguous, fast-moving startup environments
- Experience shipping high-quality full-stack products independently
Responsibilities
- Design and build full-stack product features across frontend and backend systems
- Develop scalable APIs and backend services for enterprise finance workflows
- Build customer-facing applications using Next.js, React, and TypeScript
- Own schema design, database migrations, and backfill strategies using Prisma and MySQL
- Build and maintain event-driven workflows using tools like Inngest or Temporal
- Drive architectural decisions across the platform as the first senior engineering hire
- Establish engineering best practices around observability, incident response, and runbooks
- Mentor engineers through code reviews and system design discussions
- Collaborate directly with founders on product direction and technical trade-offs
- Improve system reliability, uptime, and deployment safety in a high-stakes fintech environment
- Build end-to-end workflows spanning UI, API, database, and infrastructure layers
- Participate in system design and architecture planning for a rapidly scaling product
- Help define the engineering culture and technical standards as the team grows
- Ship production-grade software with significant autonomy and ownership
- Build infrastructure powering enterprise accounts receivable automation at scale
Benefits
- Competitive equity package
- Opportunity to join a fast-growing Series A AI fintech company
- Significant ownership over architecture and product direction
- Direct collaboration with founders and executive leadership
- Exposure to AI-native enterprise automation and fintech infrastructure
- High autonomy and influence as the first senior engineering hire
- Opportunity to shape engineering culture during a critical growth phase
- Work on meaningful operational problems with direct customer impact
- Onsite collaboration with a highly ambitious engineering team in San Francisco
- Career acceleration through broad ownership and visibility
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What This Job Offers
Job Type
Full-time
Career Level
Senior
