Senior / Staff Application Security Engineer

Suno • Boston, MA

7d • $230,000 - $330,000 • Onsite

About The Position

We’re looking for a Senior / Staff Application Security Engineer to own the security of how our product is built. You’ll be the person who makes sure our code, APIs, and services are secure by design — threat-modeling the product, hardening the application layer, and building the AppSec practice from the ground up.

Requirements

• 6+ years in security engineering with deep, hands-on application-security expertise.
• Strong command of the vulnerability classes that cause incidents and how to eliminate them at the source — code, API, and authz design.
• A builder who has stood up AppSec practices and secure-SDLC tooling, not only operated established ones.
• Fluent in modern application stacks and comfortable in AWS.
• Able to work shoulder-to-shoulder with engineers and raise the bar without becoming a blocker.
• Able to write and ship production-quality code, not only review it.
• Curiosity about emerging AI/LLM threat classes and how to defend against them as the product evolves.

Nice To Haves

• Consumer product at scale
• Secure-by-design work on generative-AI or ML product surfaces
• Early security-hire experience

Responsibilities

• Execute application security end to end: threat-model features and services, and drive remediation of the most significant risks.
• Secure the application layer against the vulnerabilities that matter most — injection, broken authentication and authorization, and insecure APIs.
• Build and run a secure SDLC: code-review guardrails, SAST/DAST, dependency and supply-chain security, secrets management, and pre-production testing.
• Harden authentication, authorization, and session/identity handling across the product.
• Secure the AI-specific application surface — model and inference endpoints, prompt and input handling, and the new classes of vulnerability that come with shipping generative features.
• Partner with product and platform engineering to design security in early and raise the security bar across the codebase.
• Set the standard for how engineering reasons about and ships secure code.

Benefits

• Company Equity Package
• 401(k) with 3% Employer Match & Roth 401(k)
• Medical, Dental, & Vision Insurance (PPO w/ HSA & FSA options)
• 11 Paid Holidays + Unlimited PTO & Sick Time
• 16 Weeks of Paid Parental Leave
• Creative Education Stipend
• Generous Commuter Allowance
• In-Office Lunch (5 days per week)

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed