Information Systems Security Officer (ISSO)

Apex Technology, Inc.•Los Angeles, CA

2d•$104,000 - $143,000•Hybrid

About The Position

Apex is looking for an Information Systems Security Officer (ISSO) to keep assigned systems secure, documented, and ready for customer or third-party review. You will work with system owners, IT, engineering, the SOC, and the Cybersecurity Lead to make sure security requirements are implemented in the environment and supported by evidence that holds up under review. The primary focus is NIST SP 800-171 and CMMC Level 2. This role will also support ATO activities, SOC 2 Type II, ISO-aligned compliance work, and other customer security requirements as Apex grows.

Requirements

Active TS/SCI clearance required
US Citizenship required
3 or more years of experience as an ISSO, security compliance analyst, security engineer, system administrator with security responsibilities, or a similar role
Strong working knowledge of NIST SP 800-171, CMMC Level 2, POA&M management, control evidence, and assessment preparation
Experience maintaining an SSP or equivalent system security documentation and supporting formal security reviews
Ability to understand and validate evidence from identity, cloud, endpoint, network, vulnerability, and logging platforms
Strong follow-through across multiple teams and the ability to write security documentation that clearly reflects what is actually implemented

Nice To Haves

Experience with ATO, RMF, NIST SP 800-53, SOC 2 Type II, ISO 27001, DFARS 252.204-7012, SPRS, STIGs, or classified system security
Experience with Microsoft GCC High, CrowdStrike, Palo Alto, Tenable, AWS GovCloud, Entra ID, or similar enterprise security platforms
Security+, CGRC, CISSP, or a comparable security certification
Experience supporting aerospace, defense, national security, ATO, RMF, or other regulated technical environments

Responsibilities

Serve as the security point of contact for operations and keep teams informed on the current cyber posture.
Work with the Cybersecurity team to assess requirements, risk findings, and due dates for contracts.
Maintain the SSP, system inventory, policies, procedures, and supporting evidence for our CUI environment.
Track NIST SP 800-171 and CMMC Level 2 implementation at the specific artifact level.
Support ATO and RMF activities including creating and updating security documentation and writing POA&Ms with target completion dates.
Validate evidence from our cybersecurity suite including CrowdStrike, Palo Alto, Tenable, and Jira.
Lead vulnerability and configuration remediation with system owners; make sure ownership, expectations, and target dates are clear.
Lead security reviews on privileged accounts, terminated users, vulnerability results, and other security requests from the program.

Benefits

Receive equity in Apex
100% company-paid medical, dental, and vision for you and your dependents
$100k life insurance at no cost
15 days vacation, growing to 20+ days annually
10 paid holidays
Competitive 401(k) plan with generous matching - 100% match on first 3%, 50% on next 2%
8 weeks paid parental leave
Childcare reimbursement up to $350/day for work-related travel
Daily catered lunch
Unlimited snacks
Monthly office socials
Pickleball tournaments
Run club
Gatherings for you and your family
Your dream desk setup and all the tools you need to be your most productive self