Sr. Manager, Enterprise Cyber Defense

Dexcom; United States; Hybrid; USD 181,000 - 302,000; Full time

Benefits offered by this job

Medical, dental, vision coverage

Flexible work arrangements

Unlimited paid time off

Training & conferences

Career mentorship

Job summary

Dexcom is seeking a Senior Manager to lead Enterprise Cyber Defense, uniting detection engineering, incident response, threat hunting, and cyber readiness on a global scale. You will build a high-performing team, drive a threat-informed lifecycle, and coordinate cross-functional incident response with executive-level communication.

The role emphasizes AI-assisted automation, advanced telemetry, and readiness exercises, with travel 5–15% and a flexible remote/hybrid work arrangement.

Qualifications

• 10+ years of experience in cybersecurity, IT, or engineering; 5+ years focused on cyber defense, detection and response.
• Proven success building, transforming, or scaling enterprise cyber defense capabilities, with strong experience in detection engineering, incident response, and threat-informed defense.
• Strong understanding of modern detection and response technologies, including SIEM, SOAR, XDR, EPP, NDR, email security, identity telemetry, and cloud security.
• Deep knowledge of adversary behaviors, threat hunting, incident response, and detection methodologies, including practical use of MITRE ATT&CK; red/purple teaming or cyber readiness exercises is strongly preferred.
• Experience applying automation, AI, or machine-learning capabilities to security operations, including evaluating automated outputs, defining performance measures, and maintaining appropriate human oversight for security decisions.

Responsibilities

• Define and execute an Enterprise Cyber Defense strategy, operating model, and roadmap aligned to Dexcom’s business risk, threat landscape, and Information Security priorities.
• Build and lead a high-performing global cyber defense organization across employees, contractors, and strategic service providers.
• Build and mature a threat-informed detection engineering lifecycle that converts adversary behaviors into measurable detection and prevention coverage.
• Lead the cyber response to emerging and non-traditional risk scenarios and other evolving threats requiring cross-functional investigation, containment, and risk mitigation.
• Lead the agentic SOC and security automation strategy, using AI-assisted triage and investigation, and human-in-the-loop controls to improve response speed, consistency, and decision quality.
• Establish proactive threat hunting and adversary-validation capabilities, using threat intelligence, red and purple team activities, penetration-test findings, and technical simulations.
• Own the cyber readiness program, including tabletop exercises, technical response simulations, playbook validation, escalation testing, and readiness assessments.
• Provide oversight and incident command for high-severity cyber incidents, coordinating response across Security, IT, Privacy, Legal, business teams, and external partners, and ensuring lessons learned are translated into improved detections, automation, controls, and response practices.
• Set the strategy, architecture, integration, and optimization priorities for cyber defense platforms and telemetry, including SIEM, SOAR and case management, endpoint and network detection, email threat defense, and cloud security signals.
• Define and report cyber defense KPIs and KRIs that measure detection coverage and efficacy, response performance, false-positive reduction, automation and AI-agent performance, readiness, and risk reduction.

Skills

Threat hunting

Incident response

Detection engineering

Security operations

AI in security

Cross-functional leadership

Executive communication

Education

Bachelor's degree in a technical discipline

Tools

SIEM

SOAR

XDR

EPP

NDR

Cloud security

Email security

Identity telemetry

Job description

The Company DexcomCorporation (NASDAQDXCM) is a pioneer and global leader in continuous glucose monitoring (CGM). Dexcom began as a small company with a big dream: To forever change how diabetes is managed. To unlock information and insights that drive better health outcomes. Here we are 25 years later, having pioneered an industry. And we’re just getting started. We are broadening our vision beyond diabetes to empower people to take control of health. That means personalized, actionable insights aimed at solving important health challenges. To continue what we’ve started: Improving human health. We are driven by thousands of ambitious, passionate people worldwide who are willing to fight like warriors to earn the trust of our customers by listening, serving with integrity, thinking big, and being dependable. We’ve already changed millions of lives and we’re ready to change millions more. Our future ambition is to become a leading consumer health technology company while continuing to develop solutions for serious health conditions. We’ll get there by constantly reinventing unique biosensing‑technology experiences. Though we’ve come a long way from our small company days, our dreams are bigger than ever. The opportunity to improve health on a global scale stands before us.

Meet The Team: The Dexcom Information Security team is looking for a Senior Manager to lead our Enterprise Cyber Defense (ECD) function, a global defense capability designed to move beyond traditional reactive security operations. ECD brings together detection engineering, incident response, threat hunting and validation, cyber readiness, cyber risk response, security automation, and defensive technology engineering to reduce cyber risk and strengthen resilience against evolving threats.

Where You Come In:

• Define and execute an Enterprise Cyber Defense strategy, operating model, and roadmap aligned to Dexcom’s business risk, threat landscape, and Information Security priorities.
• Build and lead a high‑performing global cyber defense organization across employees, contractors, and strategic service providers.
• Build and mature a threat‑informed detection engineering lifecycle that converts adversary behaviors into measurable detection and prevention coverage.
• Lead the cyber response to emerging and non‑traditional risk scenarios and other evolving threats requiring cross‑functional investigation, containment, and risk mitigation.
• Lead the agentic SOC and security automation strategy, using AI‑assisted triage and investigation, and human‑in‑the‑loop controls to improve response speed, consistency, and decision quality.
• Establish proactive threat hunting and adversary‑validation capabilities, using threat intelligence, red and purple team activities, penetration‑test findings, and technical simulations.
• Own the cyber readiness program, including tabletop exercises, technical response simulations, playbook validation, escalation testing, and readiness assessments.
• Provide oversight and incident command for high‑severity cyber incidents, coordinating response across Security, IT, Privacy, Legal, business teams, and external partners, and ensuring lessons learned are translated into improved detections, automation, controls, and response practices.
• Set the strategy, architecture, integration, and optimization priorities for cyber defense platforms and telemetry, including SIEM, SOAR and case management, endpoint and network detection, email threat defense, and cloud security signals.
• Define and report cyber defense KPIs and KRIs that measure detection coverage and efficacy, response performance, false‑positive reduction, automation and AI‑agent performance, readiness, and risk reduction.

What Makes You Successful:

• BS/MS in Computer Science, Cybersecurity, Information Technology, Engineering, or a related field, or equivalent work experience.
• 10+ years of experience in cybersecurity, IT, or engineering; 5+ years focused on cyber defense, detection and response, or incident response.
• Proven success building, transforming, or scaling enterprise cyber defense capabilities, with strong experience in detection engineering, incident response, and threat‑informed defense.
• Strong understanding of modern detection and response technologies, including SIEM, SOAR, XDR, EPP, NDR, email security, identity telemetry, and cloud security.
• Deep knowledge of adversary behaviors, threat hunting, incident response, and detection methodologies, including practical use of frameworks such as MITRE ATT&CK; experience with red/purple teaming or cyber readiness exercises is strongly preferred.
• Experience applying automation, AI, or machine‑learning capabilities to security operations, including evaluating automated outputs, defining performance measures, and maintaining appropriate human oversight for security decisions.
• Demonstrate the ability to lead through high‑severity incidents and ambiguous situations, communicate technical risk to executives and non‑technical stakeholders, and drive cross‑functional teams toward timely decisions and outcomes.
• Strong background leading globally distributed technical teams and service providers.
• May bring certifications including CISSP, CISM, GIAC, or other relevant cyber defense certifications.

What You’ll Get:

• A front‑row seat to groundbreaking technology that impacts lives around the world.
• A full and comprehensive benefits program, including medical, dental, and vision coverage, and wellness programs.
• Competitive compensation with performance incentives and opportunities for advancement within a growing, innovative company.
• Work‑life balance support through flexible work arrangements and unlimited paid time off.
• Access to in‑house training, development programs, career mentorship, and opportunities to attend security conferences to support your professional growth.
• The chance to work in an inclusive, diverse environment that values teamwork, collaboration, and continuous improvement.
• The opportunity to connect with the #dexcomwarriors community and contribute to a purpose‑driven mission that makes a difference.
• Travel required: 5‑15%
• Remote Workplace: Your location will be a home office; you are not required to live within commuting distance of your assigned Dexcom site (typically 75 miles/120km). If you reside within commuting distance of a Dexcom site (typically 75 miles/120km) a hybrid working environment may be available. Ask about our Flex workplace option.

Salary: $181,000.00 - $301,600.00 #DexcomUS

Since 1999, Dexcom has simplified and revolutionized diabetes management, positively impacting millions worldwide. At Dexcom, we’re more than just a medical device company; we’re a collective of visionary thinkers, trailblazers, and problem solvers. Our mission transcends the ordinary. We aim to revolutionize healthcare, one groundbreaking technology at a time.

Experience and Education Requirements

Typically requires a Bachelor’s degree in a technical discipline with 13+ years of industry experience 5-8 years of previous people management experience.

An Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, age, national origin, or protected veteran status and will not be discriminated against on the basis of disability.