Application Security Engineering Manager

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. Important to understand: we're not looking for someone to dictate the roadmap or daily activities of the team. What we need is someone to enable the…
• 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.
• What's in it for you
• Lead a small, senior team with high autonomy, and focus on creating leverage rather than running a ticket queue.

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