Sr. Security Analyst

Sr. Security Analyst

Job Locations US-Washington, D.C. | US-TX-Austin | US-TX-Dallas

ID 2026-1783 Category Engineering Position Type Regular Full-Time

Who We Are

Ready to make a real impact in cybersecurity? At Critical Start, we're not just protecting organizations; we're redefining how it's done. We're a team united by an inspiring purpose: to stop breaches, simplify security, and shape the future of cyber defense. If you're passionate about cutting-edge technology, thrive in a collaborative environment, and want your work to truly matter, you've found your home.

We deliver 24x7 AI-accelerated, human-validated detection, investigation, and response across IT and OT. This means we cut through the noise, investigate real threats, and take trusted, SLA-backed action—all powered by the brightest minds and the latest AI. Since 2012, we've been helping organizations outpace evolving attacks with faster response , fewer escalations, and measurable risk reduction.

Innovation isn't just a buzzword here; it's our DNA. We pioneered the first MOBILESOC app for on-the-go detection and response, infused AI into automated alert resolution to eliminate noise, and slashed investigation time by an astounding 99.3%. We're transforming how security teams work, and you could be a part of it. From AI-assisted triage to analyst copilots that elevate human expertise, we combine machine intelligence with human judgment to deliver outcomes our customer’s trust.

If you're looking for a high-trust, high-impact team where your ideas are amplified by AI and valued by colleagues and customers alike, Critical Start is the place for you. Come build the future of cybersecurity with us!

Who You Are

The ideal candidate for the Senior Security Analyst role possesses at least 6 months of SOC experience, and a Security+ certification. They excel in triaging MDR alerts, analyzing events, and recommending or implementing response actions to mitigate threats effectively. As a Subject Matter Expert in our platform and proficient with EDR, SIEM, and security platforms like Microsoft Sentinel, Splunk, and CrowdStrike Falcon, they ensure accurate escalations and orchestration. They also contribute to creating and reviewing playbooks and automations to enhance efficiency and accuracy. With strong analytical and communication skills, they handle client communications for high-severity incidents and maintain operational integrity through meticulous review and verification processes. This candidate demonstrates technical expertise, attention to detail, and a commitment to ensuring robust cybersecurity measures.

What You Will Be Doing?

Initial Triage of MDR Alerts

Participate in shift-based teams performing 24x7 monitoring of customer networks to detect and stop attacks.

Analyze Events, Alerts, and Threat Intelligence data used in investigations of potential attacks against customer networks.

Recommend response actions for active attacks

Implement response actions to stop attackers with approval of Supervisor/Sr. Analysts

Approval of Security Analyst Escalations

Senior Security Analysts review post investigation Analyst escalations for response accuracy, protection actions, recommendations, and grammar before sending them to the customer.

Orchestration creation & approval for MDR alerts

Create playbooks, knowledge objects, and other automations within the MDR SOAR platform

Review Security Analyst created orchestration for decision accuracy, sound logic, and proper documentation prior to adding it to the Trusted Behavior Registry.

Client communications related to High & Critical investigations

Written and verbal when required

Subject Matter Expert (SME) within our platform

Able to clearly navigate and articulate all aspects of the ZTAP console to both Security Analysts and customers

Mid-level competence within MDR tool suite (13 total vendors)

EDR: Microsoft Defender for Endpoint, CrowdStrike Falcon, Palo Alto Cortex XDR, VMWare Enterprise Endpoint (Formerly CB-Response and CB-Defense), Trend Micro Vision One

SIEM: Microsoft Sentinel, Splunk, Devo

Other: Microsoft Defender Suite (M365D, Outlook, Identity, Cloud)

Verifier for Console Actions

Able to verify correct execution of Lead and Principal console protection actions to provide two-person integrity.

What You Will Bring?

At least 6 months of SOC Tenure (Beginning your first day on shift) or equivalent experience

Security+ Certification or Equivalent

What It's Like Working Here

Imagine a dynamic, enjoyable, and rewarding work environment. We are professionals, and the work we do holds immense significance, like saving our customers from potential disasters. However, we believe in not taking ourselves too seriously.

Prefer a casual dress code every day? No problem, as we find comfort enhances our thinking.

Our workplace in Plano, TX offers open offices, collaborative meeting spaces, phone rooms, and wellness rooms. In the breakroom, friendly competition arises with games like ping-pong, bubble hockey machine, foosball, or the gaming machine. What harm does a little healthy competition among friends do?

What does our Compensation and Benefits package entail?

Competitive salary with bonus potential

Comprehensive health benefits with generous employer contributions for medical, dental, and visio n

Additional Ancillary Benefits offered at 100% employee contribution

Unlimited PTO (Paid Time Off) policy

Paid Parental and Military Leave

Dental and