Senior Security Engineer, Operations

K2 is building the largest and highest-power satellites ever flown, unlocking performance levels previously out of reach across every orbit. Backed by over $1 billion in total funding from leading investors including Altimeter Capital, ICONIQ, Kleiner Perkins, Lightspeed Venture Partners, Redpoint Ventures, and T. Rowe Price — and with over $1 billion in signed contracts across commercial and US government customers, we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. The rise of heavy-lift launch vehicles is shifting the industry from an era of mass constraint to one of mass abundance, and we believe this new era demands a fundamentally different class of spacecraft. Engineered to survive the harshest radiation environments and to fully capitalize on today's and tomorrow's massive rockets, K2 satellites deliver unmatched capability at constellation scale and across multiple orbits. With multiple launches in 2027 and plans to scale to 100 satellites a year, we're Building Bigger — helping develop the solar system and build toward a Kardashev Type II (K2) civilization. If you are a motivated individual who thrives in a fast-paced environment and you're excited about contributing to the success of a high-growth Series D-funded company, we'd love for you to apply. The Role   K2 is a target for sophisticated adversaries, from nation-state actors to criminal groups, all intent on stealing or disrupting the technology behind a new class of high-powered satellites. This role owns detection and response for our corporate environment: you’ll run and mature our SIEM, build detections against real adversary tradecraft, triage what fires, and drive incidents from first signal through containment, eradication, and lessons learned. You’llbe deeply hands-on across identity, endpoints, SaaS, network, and cloud telemetry, closing the visibility gaps you find rather than simply documenting them. This is a role for someone who thrives on real-world impact and operates with urgency when it counts. Every detection you write and every incident you shut down directly supports our ability to move fast, operate confidently, and deliver breakthrough satellite capabilities.   Responsibilities   Own day-to-day detection and response across the corporate environment, from alert triage and investigation through containment and remediation   Administer and mature the SIEM, including log source onboarding, parsing and normalization, telemetry enrichment, rule tuning, and platform health, retention, and cost   Write, test, and maintain detection content mapped to MITRE ATT&CK using detection-as-code practices, including version control, peer review, and automated testing   Act as incident commander for corporate security incidents, coordinating stakeholders and delivering timelines, root cause analysis, and post-incident follow-through   Build response playbooks and automation across SOAR, scripting, and vendor APIs to reduce time to detect, triage, and contain   Threat hunt proactively across endpoint, identity, SaaS, and cloud telemetry using threat intelligence and hypotheses about adversary behavior   Run adversary emulation and purple team exercises to validate detection coverage, then close the gaps you find   Perform host, network, and cloud forensics across macOS, Windows, and Linux to reconstruct attacker activity and scope impact   Investigate phishing, business email compromise, credential abuse, and insider risk in partnership with IT, HR, and Legal   Partner with IT and infrastructure teams to harden identity, endpoint, and network controls, including conditional access, EDR policy, MDM baselines, segmentation, and secure remote access, informed by what investigations reveal   Translate detection and incident findings into vulnerability management priorities and security architecture improvements   Participate in an on-call rotation for security escalations, including occasional after-hours and weekend response   Maintain runbooks, detection documentation, and standard operating procedures, and mentor junior team members on investigation and response tradecraft   Support compliance and audit efforts by producing monitoring, detection, and incident response evidence as needed   Qualifications   5+ years of experience in security operations, detection and response, or incident response, preferably in a fast-paced startup or technology environment   Hands-on experience administering and tuning a SIEM (e.g., Splunk, Microsoft Sentinel, Elastic, Panther, or Chronicle), including log source onboarding, parsing, and detection rule development   Demonstrated experience leading security incidents end to end, from detection and scoping through containment, eradication, and post-incident review   Strong working knowledge of attacker tactics, techniques, and procedures (TTPs), the MITRE ATT&CK framework, and the evidence sources needed to investigate them   Experience investigating endpoint, identity, network, and cloud telemetry across macOS, Windows, and Linux, including EDR, identity provider, and SaaS audit logs   2+ years of development experience with any modern programming language (including but not limited to Python, Go, C++, Rust) used to automate detection, enrichment, and response, in lieu of a degree; OR a bachelor’s degree in security engineering, cyber security, computer science, engineering, math, or other STEM discipline   Knowledge of operating systems, networking, cloud and SaaS platforms, security best practices, and log analysis at scale   Comfortable working with mission critical and sensitive systems, with a sense of urgency appropriate with responsibilities   Due to the high visibility of this position, excellent interpersonal skills, attention to detail, and problem-solving skills   Nice to Have   Bachelor’s degree (or equivalent) in computer science or