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Application Security Engineering Manager

Synthesia· Engineering
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RemoteFull-timePosted 4mo ago

About the role

Engineering Manager for the AppSec team responsible for leading senior-level security engineers, shaping AppSec strategy, and embedding security into the development lifecycle at scale within an AI-centric SaaS company.

Responsibilities

  • Lead, support, enable and grow the AppSec team — owning hiring, onboarding, performance, and career development for a team of Senior and Staff-level Security Engineers.
  • Own the formalisation of AppSec strategy and roadmap, translating team input, business risk and engineering context into a clear, prioritised programme of work with measurable outcomes.
  • Be a credible technical partner to your team — able to engage substantively on threat models, security architecture, agentic tooling design, and risk decisions, and willing to get into the details when it matters.
  • Define and maintain the team's operating rhythm: OKRs, quarterly planning, cross-team coordination, and stakeholder communication up to leadership.
  • Act as a key interface between AppSec and the rest of the organisation and leadership — building relationships with business leadership, engineering leads, the Developer Platform team, Architecture Working Group, and partner functions like Legal and Moderation, to embed security into how Synthesia builds.
  • Participate in maintaining and evolving Synthesia's approach to AI-assisted development security, including how we secure our own use of agentic coding tools and how we assess the security of AI-generated code.
  • Own AppSec's relationship with the broader Security function, ensuring tight alignment between AppSec and other Infosec teams on shared risks, incidents, and cross-cutting initiatives.
  • Represent AppSec externally where relevant — with customers, auditors, and in the context of compliance programmes such as SOC2 and ISO42001.

Qualifications

  • Strong communicator capable of engaging across technical staff engineers, leadership, product and engineering partners.
  • Strong engineering background in application security with hands-on experience in threat modelling, secure design review, (AI-)SAST/SCA tooling, vulnerability management, and/or security automation.
  • Proficiency in Python and JavaScript; experience with AWS and/or GCP from a cloud infrastructure perspective; familiarity with GitHub Actions.
  • Meaningful people management experience including hiring, growing, and performance management of security engineers; understanding of what good looks like at senior IC levels.
  • Experience leading or significantly contributing to an AppSec programme in a fast-growing SaaS or AI company, ideally where engineering scaled rapidly.
  • Knowledge of AI-native security engineering — impact of LLMs and agentic tools on attack surfaces and defensive use.
  • Experience in mature engineering environments and embedding security as a collaborative partner.

Skills

Required:Threat modellingSecure design reviewSecurity tooling (AI-/SAST/SCA)PythonJavaScriptCloud (AWS/GCP)GitHub Actions
Nice to have:Vulnerability managementSecurity automation

Benefits

  • A flexible, remote friendly role based out of Europe or hubs in London, Copenhagen, Munich, or Zurich.
  • 25 days of annual leave + public holidays in the country of base.
  • Generous referral scheme.
  • Work from home setup.
  • Ability to work from anywhere for up to 60 days per year.
Last updated Jul 15, 2026. Interested? Apply on the company site.

About Synthesia

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Synthesia is a #1 AI Video Platform for Business. Our AI Video Generator enables anyone to create professional videos without mics, cameras, actors, or studios. Using AI, we’re radically changing the process of video content creation, making it scalable and affordable while maintaining high quality.

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