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Senior Application Security Engineer

Datadog· Security / Application Security
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Hybrid (Paris)full-timePosted 3w ago

About the role

Senior Security Engineer within Application Security at Datadog, focusing on securing emerging application architectures (including agentic apps, LLM-enabled products, protocol-driven tool use, and untrusted execution environments) by defining security models, requirements, and controls and partnering with product and platform teams to implement secure-by-default approaches.

Responsibilities

  • Define security models, requirements, and guardrails for emerging application architectures where established patterns are incomplete or do not yet exist.
  • Design, implement, and validate practical security controls that reduce risk in emerging architectures and high-risk system behaviors.
  • Shape how emerging systems authenticate, authorize actions, isolate workloads, and access data, applying least-privilege principles throughout.
  • Partner with product, platform, Infrastructure Security, and other engineering teams to identify security gaps and embed secure-by-default requirements from early design through production.
  • Lead threat modeling and security assessments for new and existing products, focusing on evolving threats, unfamiliar trust boundaries, and new interaction patterns.
  • Prioritize and drive remediation of emerging security risks, including continuous security testing where it provides durable coverage, and refine security approaches as architectures and threats evolve.

Qualifications

  • 5+ years of experience in software engineering or development in a collaborative environment, with Go, Rust, or Python experience preferred.
  • Experience in security and/or infrastructure/platform engineering, with exposure to distributed systems, application platforms, or agent-based architectures.
  • Designed or implemented security controls within application infrastructure (authentication, authorization, API security, zero-trust networking, workload protection, sandboxing, runtime hardening).
  • Understanding of common application security vulnerabilities and mitigation techniques, including those relevant to LLM applications and agentic systems; familiarity with LLM frameworks and protocols such as MCP or A2A is a plus.
  • Strong problem-solving skills, ability to work independently and collaboratively in ambiguous or rapidly evolving problem spaces.
  • Experience driving security initiatives with engineering and leadership stakeholders and commitment to staying current with security practices and evolving threats.

Skills

Required:Security modelingThreat modelingSecurity controls designAuthentication and authorization
Nice to have:Zero-trust networking

Benefits

  • New hire stock equity (RSUs) and employee stock purchase plan (ESPP)
  • Continuous professional development, product training, and career pathing
  • Intradepartmental mentor and buddy program for in-house networking
  • Inclusive company culture, Community Guilds (employee resource groups)
  • Inclusion Talks, internal panel discussions
  • Free, global mental health benefits for employees and dependents age 6+
  • Competitive global benefits
Last updated Oct 22, 2026. Interested? Apply on the company site.

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