Senior Backend Engineer — Payroll & Ledgers

Simplex Hires LLC is hiring for a senior backend engineer to own the payroll and financial systems in our NYC office. You will design double-entry ledgers, idempotent payment execution, and reconciliations that auditors can read, partnering with Platform Engineering and store owners to ensure accuracy across payroll, bills, and deposits. You will drive the financial-correctness standards, build integrations, and guide the code quality in a small, ownership-driven team that ships rapidly with