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Security Engineer

Job in St. Peters, Saint Peters, St. Charles County, Missouri, 63376, USA
Listing for: TENEX.AI
Full Time position
Listed on 2026-06-18
Job specializations:
  • IT/Tech
    Cybersecurity, Network Security, Systems Engineer
Salary/Wage Range or Industry Benchmark: 100000 - 125000 USD Yearly USD 100000.00 125000.00 YEAR
Job Description & How to Apply Below
Location: St. Peters

Company Overview:

TENEX is an AI-native, automation-first, built-for-scale Managed Detection and Response (MDR) provider. We are a force multiplier for defenders, helping organizations enhance their cybersecurity posture through advanced threat detection, rapid response, and continuous protection. Our team is composed of industry experts with deep experience in cybersecurity, automation and AI-driven solutions. Backed by leading investors, we are rapidly growing and seeking top talent to join our mission of revolutionizing the AI-Native MDR landscape.

We’re a fast growing startup backed by industry experts and top tier investors led by Crosspoint Capital Partners and also backed by Shield Capital, DTCP (formerly Deutsche Telekom Capital Partners), Deepwork Capital, and the Florida Opportunity Fund. Seed round led by Andreessen Horowitz (a16z). As an early employee, you’ll play a meaningful role in defining and building our culture. Get in on the ground floor.

We’re a small but well-funded team that just raised a substantial round – joining now comes with limited risk and unlimited upside.

Culture is one of the most important things —explore our culture deck ex.ai to witness how we embody it, prioritizing the irreplaceable collaboration and community of in-person work.

This role will require 4 days onsite in Overland Park, KS.

The Opportunity:

We're looking for a highly motivated and skilled Security Engineer to join our dynamic team. This pivotal role is perfect for an IT administrator with a strong foundational understanding of security, eager to evolve into a full‑fledged security specialist. You'll play a crucial role in safeguarding our entire IT infrastructure and digital assets, including those of our valued customers. You will be designing, implementing, and optimizing cutting‑edge security controls and building out robust security capabilities from the ground up.

You'll be instrumental in ensuring seamless IT operations while proactively strengthening TENEX's and our customers’ security posture against an ever‑evolving threat landscape through robust engineering practices and intelligent automation.

What You'll Do:
Security Engineering & Operations:
  • Design, implement, and maintain a diverse suite of security tools and technologies, including next‑generation firewalls, Endpoint Detection and Response (EDR) solutions, Security Information and Event Management (SIEM) systems, Multi‑Factor Authentication (MFA), and Zero Trust Network Access (ZTNA) solutions.

  • Conduct comprehensive security gap assessments to identify vulnerabilities and weaknesses, proposing and implementing effective remediation strategies.

  • Actively assist with customer success initiatives by providing security expertise, integrating our solutions into customer environments, and addressing their specific security requirements.

  • Collaborate closely with our Security Operations Center (SOC) to enhance threat detection, incident response capabilities, and forensic analysis.

  • Contribute significantly to the development and enforcement of robust security policies, standards, and procedures across the organization.

  • Lead system hardening efforts for operating systems, applications, and network devices to minimize attack surfaces and enhance resilience.

Dev Ops Security Integration & Automation:
  • Champion the integration of security throughout the Dev Ops lifecycle
    , helping to build and mature our "security-as-code" capabilities.

  • Leverage APIs extensively to integrate various security tools with IT systems, enabling advanced automation and improved security orchestration. This includes automating alert enrichment, threat intelligence ingestion, vulnerability scanning, and automated containment actions in response to security incidents.

  • Develop and implement automated security workflows to streamline security operations, improve efficiency, and reduce manual intervention.

Requirements:
  • Experience: A minimum of 2+ years of progressive experience in IT, with at least 2 years specifically focused on cybersecurity operations or engineering.

  • Technical

    Skills:

    • Hands‑on experience with ZTNA, Mobile Device Management (MDM), EDR solutions (e.g., Sentinel One),…
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