Senior Software Engineer, Money Movement

$220,000 – $300,000 Base Salary + Equity
New York City | In Office

A high-growth, venture-backed software company is hiring a Senior Software Engineer, Money Movement to help build the financial infrastructure behind its platform. You’ll work across payroll, banking, payments, accounting, and ledger systems, building products responsible for moving and accurately tracking real money. [Senior Sof…(NYC).pdf | PDF]

You’ll join a highly technical engineering team building financial products from the ground up, with ownership over systems where correctness, reliability, and auditability are non-negotiable. This is an opportunity to tackle complex fintech problems while directly shaping the architecture and technical standards behind a rapidly growing platform.

What You’ll Be Doing

• Build a payroll product from the ground up, including earnings calculations, tax withholding, payment execution, and filing integrations
• Develop bill pay and accounts payable infrastructure that allows customers to pay suppliers directly through the platform
• Build embedded banking capabilities that give customers faster access to their funds
• Own and scale accounting integrations, including synchronization of invoices, bills, journal entries, and sales data
• Design double-entry ledgers supporting financial products such as deposits, loyalty, and stored value
• Build systems around idempotency, reconciliation, atomicity, concurrent transactions, and financial correctness
• Establish engineering standards for money movement that can be adopted across the broader organization
• Leverage modern AI coding agents while maintaining the guardrails required for production financial systems 

Highlights

💸 Build Money Movement Products from 0→1 – Help launch new payroll, banking, and bill pay products from the ground up

🏦 Embedded Banking & Payments – Build infrastructure that moves real customer funds and powers critical financial workflows

📒 Ledgers & Financial Correctness – Design auditable double-entry ledger systems where being off by even a cent matters

💰 Build Payroll from Scratch – Own core payroll infrastructure spanning earnings, tax withholding, payments, and filing integrations

🔄 Accounting Infrastructure – Build and scale integrations with platforms such as QuickBooks and other accounting systems

🐘 Deep PostgreSQL Engineering – Design transactional schemas and concurrency-safe systems capable of supporting growing financial workloads

🤖 AI-First Engineering Culture – Use modern AI coding agents as part of the everyday development workflow

🚀 High Ownership & Impact – Join a small engineering team where your architectural decisions can become company-wide standards

What They’re Looking For

• 5+ years of experience building production backend systems
• Strong backend engineering experience, ideally with TypeScript / Node.js
• Deep understanding of transactional systems, including idempotency, atomicity, retries, concurrency, and failure handling
• Strong experience with PostgreSQL, including schema design, transactions, and performance at scale
• Experience building systems where financial correctness and data integrity are critical
• Track record of debugging complex production problems and solving the underlying root cause
• Ability to independently own complex technical projects from architecture through production

Nice to Have

• Experience building payroll, banking, payments, ledger, or other financial systems
• Experience with accounting platforms such as QuickBooks, NetSuite, or Xero
• Experience with payment processors, ACH, reconciliation, or money movement infrastructure
• Familiarity with Next.js, tRPC, Prisma, Vercel, ElastiCache, RDS, or RDS Proxy
• Experience working with AI coding tools such as Devin, Claude Code, or Cursor
• Background in retail, POS, multi-location operations, or cash reconciliation
• Experience establishing technical or architectural standards across engineering teams

Compensation & Benefits

• $220,000 – $300,000 base salary
• Meaningful equity package
• Fully company-covered medical and dental benefits
• 401(k)
• Catered meals
• High-impact role with significant technical ownership
• Opportunity to build foundational financial products from the ground up