Hardened Web Application Rebuild for a Regulated Financial Services Firm

Overview

Rebuilt the public and client-facing web application for a regulated financial services firm whose existing site had accumulated years of technical debt and hadn't been architected with today's security expectations in mind. The rebuild followed secure-by-default practices throughout — strict input validation, hardened session handling, and a minimized attack surface on every public-facing endpoint — reviewed against the compliance requirements the firm's industry demands. We worked from a security-first checklist agreed with the firm's compliance officer before writing any application code, rather than treating security as a final review step. The rebuild also included a staged migration plan so the firm could move traffic over without a disruptive cutover. A regulated financial services firm's public and client-facing web application had accumulated years of technical debt and hadn't been architected with today's security expectations in mind, creating real compliance exposure. We rebuilt the application following secure-by-default practices throughout — strict input validation, hardened session handling, minimized attack surface — reviewed against the firm's compliance requirements from a security-first checklist agreed before any code was written. We agreed a security-first checklist with the firm's compliance officer before writing any application code, treating it as a design input rather than a final review step. The rebuild was migrated in stages, validating each piece against the checklist before moving traffic over. The rebuild closed several longstanding security gaps identified in the firm's prior compliance audit, giving them a clean foundation heading into their next review cycle instead of carrying forward the same flagged issues.