Senior Application Security Engineer

Tatari is on a mission to revolutionize TV advertising. , reach their customers using linear and streaming TV ads. Our platform combines sophisticated media buying with proprietary analytics to turn TV advertising into an automated, digital-like experience, enabling businesses of any size to advertise on TV.

That approach has earned Tatari broad industry recognition, including being named Best CTV AdTech Platform in the 8th annual MarTech Breakthrough Awards , as well as honors from Digiday ( Best Connected TV Platform) , AdExchanger ( Most Innovative TV Advertising Technology ), and Business Insider ( Hottest AdTech Companies) . Tatari has also been recognized as the Best Place to Work by Inc. Magazine .

Backed by an executive team of former founders and senior leaders from companies including Shazam, TrueCar, AdapTV, LiveRail, Amazon, Google, Meta, Microsoft, and Yahoo, Tatari continues to scale rapidly as TV advertising enters its next major era. We're a late-stage AdTech company with a recently attained SOC2 Type II attestation, and a clear mandate to mature our security and privacy posture. We're looking for the right engineer to make it happen.

The Role: As our first dedicated Application Security Engineer, you will define the security architecture for everything we ship. You will work directly with our Engineering teams to identify vulnerabilities, design mitigations, and build the tooling and automation that makes secure development the path of least resistance. You will report to the Head of Security as a key technical contributor to Tatari's Security program.

You write production-quality code. You think like an attacker. And you know how to bring engineers along with you.

Responsibilities

: Design and execute greenfield AppSec initiatives across Tatari's SaaS platform from threat modeling to remediation Build and maintain security automation integrated into CI/CD pipelines and manage software supply chain risk Own container security across build and runtime Develop internal tooling and libraries that make secure coding easier for application engineers Own SAST/DAST/SCA tooling: selection, tuning, CI/CD integration, and triage Conduct application security reviews and threat models for new features and architectural changes Identify and remediate vulnerabilities across APIs, services, and data pipelines Partner with Engineering teams to establish secure coding standards and provide hands-on guidance Assess and mitigate LLM-introduced risks in product features Integrate agentic tooling into AppSec workflows to reduce toil Contribute to security incident response when application-layer issues are involved

Qualifications

: Production Python experience with the engineering depth to review code meaningfully and build security tooling; Java or Rust is a bonus Significant hands-on application security experience, ideally at a SaaS company, including working knowledge of established standards (OWASP Top 10, API Security Top 10, ASVS, SPVS, AISVS) and how common vulnerability classes manifest in production systems Threat modeling experience with Product and Engineering teams Experience building security tooling or automation (scripts, pipelines, libraries) Familiarity with AWS and Kubernetes security controls as they relate to application-layer risks Working knowledge of how LLMs introduce new attack surfaces and how to mitigate them, with practical experience using AI tools in security or engineering workflows Demonstrated experience reviewing API designs and implementations for auth anti-patterns, token mismanagement, injection risks, and sensitive data exposure Track record embedding with Engineering teams: code review, design consultation, and standards definition Experi