Senior Software Engineer

Senior Software Engineer

$200,000 - $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.

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

• $200,000 - $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