Senior Software Engineer

Who is Recruiting from Scratch:

Recruiting from Scratch is a premier talent firm that focuses on placing the best product managers, software, and hardware talent at innovative companies. Our team is 100% remote and we work with teams across the United States to help them hire.

Senior Software Engineer

Location: San Francisco, CA

Company Stage of Funding: Series A / AI + Fintech + Accounts Receivable Automation Startup

Office Type: On-site (5 days/week in San Francisco)

Salary: $210,000 – $240,000 Base

Equity: Competitive Equity

Bonus: Competitive total compensation package

Visa: No sponsorship available

Company Description

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.

What You Will Do

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

Ideal Candidate Background

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

Strong Signals

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

Compensation and Benefits

Base salary: $210,000 – $240,000

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

Why Join

This is an opportunity to become the foundational senior engineer at a breakout AI fintech company attacking a massive and underserved operational problem.

Rather than building incremental SaaS features, the company is redesigning enterprise accounts receivable workflows from the ground up with AI-native automation.

You'll work directly with founders, own major technical decisions, and help build the engineering foundation for a company that is scaling rapidly after a major Series A raise.

The role offers a rare combination of full-stack engineering, fintech infrastructure, AI-enabled workflows, architectural ownership, mentorship, and startup impact.

If you enjoy building systems end-to-end, shaping engineering culture, operating with high autonomy, and solving real enterprise problems, this role offers exceptional scope and upside.