Staff Security Engineer, Application Security

## About the role At Homebase, you'll join a team that's bold, fast-moving, and obsessed with helping small businesses thrive. We build with empathy, act with urgency, and take big swings that drive real-world impact. Here, every Homie shows up to raise the bar, support one another, and celebrate wins as a team. We're not just building an app—we're building unstoppable teams. So what do you say, are you in? ## 📍Your Impact Starts Here We're looking for a hands-on Staff Security Engineer to own and shape Homebase's Application Security domain. This is a technical leadership role at the E5 level—you'll define the multi-quarter strategy for how we secure our products, set architectural direction, and pioneer new capabilities that keep pace with our rapid growth. Homebase's product suite spans scheduling, payroll, time tracking, HR, team communication, and a growing ecosystem of AI-powered features. That breadth creates fascinating security challenges, from protecting sensitive workforce and financial data to securing the AI models and pipelines that are becoming central to our product experience. You'll be the recognized expert our engineering organization turns to for application security decisions. You'll work at the intersection of security, product, and engineering, partnering with engineering leaders to embed security into architecture from the ground up, while building the platforms and tooling that let developers ship safely at speed. ## These are the key ways you'll contribute and create impact in this role: ### Security Strategy & Architecture - Define and execute Homebase's multi-quarter Application Security roadmap, aligning security initiatives with business objectives and company OKRs. - Architect secure-by-default patterns, frameworks, and paved roads that developers adopt naturally, removing entire classes of vulnerabilities before they reach production. - Evaluate emerging security technologies and make build-versus-buy decisions that shape the security platform. - Drive security and product trade-off decisions at the architectural level, balancing protection with velocity. - Influence company-wide engineering practices and security investments through data-driven recommendations. ### AI Security - Lead threat modeling and security architecture reviews for AI-powered features, model training pipelines, and LLM integrations. - Design and implement security controls specific to AI/ML systems, including prompt injection defenses, model input validation, output filtering, and data pipeline integrity. - Create AI-powered vulnerability detection and security automation that multiplies the team's effectiveness. - Partner with AI engineering teams to establish secure development patterns for model deployment and inference infrastructure. - Stay ahead of the evolving AI threat landscape and translate emerging risks into practical engineering guidance. ### Secure Development & Tooling - Build and maintain security tooling and automation that integrates seamlessly into