Custom Software Development & Penetration Testing in New York, NY

The wrong contractor burns weeks and tens of thousands. QUANT LAB USA's pitch in NYC is simple — founder-led, accountable, modern stack, security-aware from day one. Same time zone as Manhattan, full overlap, no junior layer between you and the engineer writing the code.

New York's software economy is uniquely demanding. Wall Street and the broader financial-services layer — Goldman Sachs, JPMorgan, Morgan Stanley, Citi, BlackRock, plus an enormous fintech and brokerage-adjacent vendor ecosystem — sets the technical bar most other cities aspire to. Ad-tech and media-ops anchored by IPG, WPP, Omnicom, and Publicis network agencies generates a steady demand for custom CRM, programmatic reporting, and creative-ops tooling. Hedge funds and family offices scattered from Greenwich south through Midtown need internal portfolio, position reconciliation, and broker-API integration work. And the relentless current of pre-seed through Series A SaaS founders — Brooklyn, FiDi, Williamsburg, Long Island City — keeps the MVP-velocity demand alive. Every one of those segments shares the same expectation: the vendor on the other end of the contract had better know what they are doing.

There is no junior layer between you and the engineer. Every project is led personally by William Beltz, every architectural decision is documented, and every line of code is reviewed before it ships. That is hard to find in the New York market at our price tier. We have shipped a production multi-strategy trading system with sub-12ms order latency and zero unplanned downtime, plus a full Active Directory pen test documenting a full attack chain from standard user to Domain Admin — both directly relevant for NYC fintech and financial-services buyers.

Production work includes J5 Sales OS, UEhub, ProtectWithBri, Wilder Recovery, and Northcrest Fence. The most directly relevant case studies for NYC buyers are the multi-strategy trading system — a production engine running MA Supertrend and VWAP in parallel with hard risk controls wired into the order path itself — and the Active Directory penetration test for a regional financial services firm. The trading system pitch resonates with quant and brokerage-adjacent NYC buyers; the AD pen test pitch resonates with fintech and SaaS founders preparing for institutional DD or NYDFS-driven review.

NYC sits in the same time zone as Georgia HQ — same business day, identical hours. Most kickoffs run as a 60–90 minute video session, with a fly-in for engagements above ~$25k. Atlanta to LGA or EWR is 2.5 hours; we plan on-site afternoons in Midtown, FiDi, Hudson Yards, Brooklyn, or Jersey City as scope warrants. Build cycles run weekly with a Friday staging URL, written notes, and the next-week plan. Most NYC engagements close on fixed-scope, fixed-price proposals — exactly the predictability a runway-conscious founder or institutional buyer expects. Every architectural decision is documented in the repo, every line of code is reviewed before merge, and every deploy runs strict TypeScript, ESLint, and CI checks. The deliverable at acceptance is the code, the database, the hosting accounts, and the architecture documentation in one handover — exactly what NYC procurement and engineering review processes expect.