Senior Software Engineer Money Movement

This role is on-site M-F in the Flatiron District New York City NY.

Our client is a Series A point-of-sale software company in NYC.

We move fast and ship daily. AI-assisted engineering isnt a talking point here; agents like Devin Claude and Codex are part of how the team works every day and engineers who master that leverage ship multiples of what they could alone.

Money Movement owns everything that touches money after the sale: Payroll Banking and Lending.

Today that means the accounting backbone our merchants reconcile their businesses on QuickBooks sync for invoices bills COGS journal entries and sales mappings plus the ledgers behind loyalty gift cards and deposits where being off by a cent is a bug. Next it means payroll: our merchants run stores with hourly staff across multiple locations and they want to pay their people from the same system that already knows every shift and every drawer count. This team is where we go from recording our merchants money to moving it.

Youll be one of the first engineers on our payroll build and a technical owner of the financial systems where correctness is non-negotiable: ledgers accounting sync and the money movement rails underneath them. This means designing systems an auditor could read double-entry ledgers idempotent payment execution reconciliation that proves everything ties out and debugging from ambiguous production signals (this merchants books are off by $0.47 since the 9th) down to root cause. Youll partner closely with Platform Engineering whose sale write path your ledgers consume and directly with store owners whose payrolls youll run. Beyond building youll establish the financial-correctness patterns the rest of engineering adopts.

• Build our payroll product from the ground up earnings computed from shift data the platform already has tax withholding payment execution and filings integrations
• Develop our bill pay product that moves our customers from paying their suppliers by check to one-click handling accounts payable directly in our platform
• Embed bank accounts directly into our OS so that our customers have access to their card processing revenues in minutes
• Own and harden our accounting integrations (QuickBooks today) where a sync bug shows up as a merchants books not balancing at month-end
• Design and maintain the ledgers behind loyalty gift cards and deposits correct idempotent and auditable under concurrent writes
• Establish the financial-correctness patterns (double-entry ledgers idempotency keys reconciliation jobs timezone cutoffs) that other teams adopt
• Multiply your output with AI agents: direct review and productionize agent-written code as a core part of your workflow with the guardrails money-touching code demands

• 5 years building production backend systems ideally in TypeScript/Node though we care more that you write correct reviewable code in any language
• Practical fluency with transactional guarantees: idempotency atomicity retry semantics and what happens when a webhook arrives twice
• Real depth in PostgreSQL: schema design an auditor could follow transactions under concurrency and queries that stay fast as ledgers grow
• An instinct for the unglamorous parts of money reconciliation rounding tax rates with three decimals done exactly right
• A bias for root cause over patch and a track record of turning one-off incidents into eliminated bug classes
• Comfort operating with high ownership in a small team where your decisions become the standard

• Experience with payroll banking ledger or other financial systems where an auditor has actually read your data model
• Experience with accounting integrations (QuickBooks NetSuite Xero) payment processors or ACH rails
• Familiarity with our stack: tRPC Prisma Vercel ElastiCache RDS/RDS Proxy
• Experience directing AI coding agents (Devin Claude Code Cursor) and building the guardrails that make them safe at scale
• Retail or POS domain experience especially multi-location operations or cash reconciliation
• History of establishing technical standards or architectural principles adopted across teams

$220k $300k Meaningful equity

This range reflects the expected compensation for this role. Compensation within the range is determined based on experience skills and scope of addition to base salary we offer meaningful early-stage equity this teams work is the foundation the company compounds on.

• Fully company-covered medical and dental benefits.
• 401(k)
• Catered Lunches and Dinners: We provide dinner each evening for employees who would like to eat and connect with the team. Lunch is provided on a weekly basis.