Custom Software Development & Cybersecurity in San Antonio, TX

QUANT LAB USA combines custom software engineering with hands-on penetration testing rooted in the MITRE ATT&CK framework — not just selling development hours. San Antonio's buyers expect their vendors to speak fluent attacker, and we do.

San Antonio runs on cyber, medicine, and military logistics. Joint Base San Antonio — Lackland, Fort Sam Houston, and Randolph — is the center of gravity, hosting the 16th Air Force (Air Forces Cyber), the NSA Texas operation, and the Brooke Army Medical Center. Around that core sits one of the densest cyber-contractor ecosystems in the nation, plus the University of Texas at San Antonio, whose National Security Collaboration Center and cyber programs feed a steady stream of talent. The South Texas Medical Center is the region's second economic engine, and the biosciences corridor, USAA's massive insurance and financial operation, and a thriving tourism economy around the River Walk fill out a deep and varied mid-market.

Most generalist agencies cannot credibly speak to penetration testing methodology. We can. Active Directory abuse paths, lateral movement, ADCS certificate abuse, Kerberoasting, wireless attacks, and web app exploitation are in-house capability, not a subcontracted line item — and every line of software we ship is reviewed against the same threat models we use on offensive engagements. For San Antonio organizations selling into primes or running compliance audits, that combination is the entire pitch.

Our pen testing track record includes a full Active Directory engagement for a regional financial services firm — an end-to-end internal assessment running eleven attack modules, every finding mapped to a MITRE ATT&CK technique, with the full attack chain from standard user to Domain Admin documented in screenshots and timestamps. The client passed their compliance audit on the first attempt and re-engaged us on a six-month cadence. That is the same methodology we apply to every San Antonio engagement, whether the buyer is a cyber contractor, a Medical Center practice, or an insurance-sector SaaS vendor.

QUANT LAB USA is founder-led and accountable end-to-end. We ship production web and SaaS applications on a modern Next.js, TypeScript, PostgreSQL, and Docker stack, and we keep our proof generic with references available under NDA — we do not name-drop clients who did not sign up to be a marketing line.

San Antonio is one hour behind Georgia HQ, so our morning and your late morning overlap completely for standups and design reviews. Pen testing runs from a secure remote infrastructure with strict source IP allowlisting and authenticated client-side VPN tunnels for internal scope — and we fly into SAT for sensitive scoping discussions and for internal pen tests requiring on-site network access. Reports are delivered in two formats: a technical deliverable with reproduction steps and remediation detail for the security team, and a board-readable executive summary with a prioritized roadmap. Custom software builds are fixed-scope and fixed-price, with a weekly Friday staging URL and full handover of code and accounts at the end. Most San Antonio engagements close inside 4–6 weeks from kickoff to final report.