---
title: 'Information Systems Security Engineer at Excelity'
canonical: 'https://feeny.ai/job/information-systems-security-engineer-excelity-herndon-2xes2zkywj8w'
type: 'job'
last_seen: '2026-09-08'
---

# Information Systems Security Engineer at Excelity

- **Company:** Excelity
- **Location:** Herndon, VA
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-08-13
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.gem.com/excelity-careers/am9icG9zdDrvQ_8GDphLcFZDGwMaNsaC

## Job description

At Excelity, we're passionate about delivering innovative technology solutions that help businesses thrive. Whether you're looking to streamline your operations, improve efficiency, or enhance customer engagement, our team of experienced professionals is here to help. So why wait? Visit excelity.io today to learn more about how we can help you achieve your goals and take your business to the next level.

Excelity is seeking a ISSE for a project responsible for building the next generation Mission Integration System for an exciting Government customer with a very critical mission. The candidate will work with the engineering team and customer to ensure successful development of high profile, complex, technical deliverables that are core to the continued success of our award-winning projects.

Required Clearance: TS/SCI with CI Poly Description:

- Design and implement safety measures and controls. Monitor network activity to identify vulnerable points. Address privacy breaches and malware threats.
- Support the Assessment and Authorization (A&A) processes and Information Assurance documentation for multiple analytic and mission systems across all CLINs
- Generate and maintain the complete security Body of Evidence (BoE) while leading the A&A activities according to the Risk Management Framework (RMF) processes (ICD 503, CNSSI-1253, NIST 800-37, NIST 800-53, etc.) for all multiple information systems
- Author, complete and maintain the System Security Plan (SSP) within XACTA
- Develop the Security Controls Traceability Matrices (SCTM), and the Security Test Plan (STP) procedures within Xacta.
- Analyze existing security systems and make recommendations for changes or improvements
- Prepare reports and action plans if a security breach does occur
- Monitor the network and provide early warning of abnormalities or problems
- Communicate the system status and keep users informed of downtime or changes to the system
- Experience working with software developers and architects to understand security requirements
- Experience guiding the application developers on security policy, identifying security requirements, providing technical guidance for the satisfaction of requirements
- Experience creating and managing the plan of action and milestones (POA&Ms), and working with project managers and engineers to develop schedules and engineering actions that mitigate open findings
- Experience supporting the Continuous Monitoring of operational systems; experience monitoring and auditing operational systems for proper use
- Log Review/Analysis using SIEM tools (Splunk, etc.)
- Vulnerability Analysis and Review (ACAS, Prisma, SonarQube, JFrog X-Ray, GitLab Code Quality)
- DISA STIGs and STIG Viewer experience Required Skills:
- 9+ years supporting Assessment and Authorization (A&A) and information assurance processes and documentation using RMF, BS degree; 7 years of experience with a masters; an additional 4 years of experience required in lieu of a degree
- Hands-on experience to validate control implementations and test procedures
- Knowledge of current security risks and protocols
- Willingness to work outside of standard hours if circumstances require
- DoD Approved 8140 Baseline Certifications (eg, Security+) certifications
- RMF, Xacta experience
- Work 100% onsite in a secure environment Desired Skills:
- Experience working with AWS/Google cloud-hosted information systems or applications
- Experience working with Containerized Systems or Applications
- Experience working with Redhat or CentOS Linux operating systems
- Experience working in a DevSecOps environment and tool chain Benefits:
- Competitive salary
- Flexible work schedule
- 100% Health, Dental, Vision, and Life Insurance plans with Flexible Spending Account (FSA)
- Long and Short-term disability coverage
- Generous paid vacation and holiday time
- Safe Harbor 401(k) Retirement Plan with 6% Employer matching contributions
- Reimbursement for professional and training development
- Company-paid memberships to professional organizations

Excelity is an Equal Opportunity Employer

## About Excelity

## Company Overview
- **One-liner**: Excelity is a small business IT services provider that delivers Agile engineering, enterprise transformation, and data visualization solutions to the U.S. federal government.
- **Entity Type**: Private (bootstrapped – no external funding disclosed)
- **Headquarters**: Warrenton, Virginia, USA
- **Founded**: 2019
- **Founders**: Jason Dever (CEO & Leadership)

## Core Business
- Primary industry: IT Services & Government Contracting
- Target customers: U.S. federal government agencies (B2G)
- Mission or purpose: “Solve the government’s most systemic challenges by applying rigorous approaches to understanding the customer base in order to implement the right IT solutions and advance agency missions.”

## Products & Services
- **Enterprise Transformation**: Modernizing legacy systems using new technologies across the organization.
- **Agile Engineering**: Rapid, iterative development with Agile processes to deliver on time and within budget.
- **Capability Pilots**: Business case and mission analysis to run scalable pilots before full deployment.
- **User Experience (UX)**: Improving information delivery and resource access to enhance user adoption.
- **Infrastructure Engineering**: Planning, deploying, and managing cost-effective, scalable, and secure cloud, on-premise, and hybrid architectures.
- **Data Visualization**: Transforming raw data into actionable insights using modern tools.
- **Solution Governance**: End-to-end business and technical management to optimize solutions.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private)
- **Key Metric**: Total employees ~31 (per Built In); listed as “Small (25–49)” by Inc.
- **Notable Investors/Partners**: None publicly listed – operates as a government contractor with trusted partnerships.
- **Growth Signals**: Recognized as a 2026 Inc. Best Workplace for fostering work-life balance through remote work, wellness benefits, and training resources. Named an “Established Excellence” company (5–14 years in business) by Inc. for the Mid-Atlantic Region.

## Competitive Advantages
- Deep focus on federal government IT challenges, providing senior and thought leadership in Agile development.
- Strong emphasis on building trusted partnerships across customer organizations, from leadership to end-users.
- Modular, agile approach that adapts to changing mission priorities – enabling rapid delivery without sacrificing enterprise stability.
- Small, empowered teams that encourage creativity and innovation, directly tied to delivery outcomes.

## Strategic Focus
- Continue serving U.S. government agencies by applying rigorous customer understanding to implement effective IT solutions.
- Expand capabilities in enterprise transformation, cloud/hybrid infrastructure, and data visualization.
- Maintain a culture that attracts top talent through remote work, wellness support, and continuous learning.

## Why Work Here
- Named an **Inc. Best Workplace (2026)**, highlighting work-life balance, remote work, wellness benefits, and training resources.
- Fully remote-friendly with an on-site office in Herndon, Virginia (employees work from physical offices but typical time on-site is none).
- Small company culture (~31 employees) that empowers team members to be creative, innovative, and grow professionally.
- Focus on federal contracting provides meaningful, mission-driven work.
- Career opportunities visible on the Gem careers page; roles include Software Engineer and Scrum Master.

## Sources
1. [excelity.io](https://excelity.io/)
2. [excelity.io/who-we-are](https://excelity.io/who-we-are/)
3. [inc.com](https://www.inc.com/profile/excelity)
4. [builtin.com](https://builtin.com/company/excelity)
5. [jobs.gem.com](https://jobs.gem.com/excelity-careers)

## Other roles at Excelity

- [Database Engineer](https://feeny.ai/job/database-engineer-excelity-herndon-9v054mhxsbfq) — Herndon, VA
- [Information Systems Security Officer](https://feeny.ai/job/information-systems-security-officer-excelity-reston-sv607damd8e0) — Reston, VA
- [Information Systems Security Engineer](https://feeny.ai/job/information-systems-security-engineer-excelity-herndon-gxagkk2kpync) — Herndon, VA
- [Graphic Designer](https://feeny.ai/job/graphic-designer-excelity-herndon-nxvp3q11da6e) — Herndon, VA
- [Scrum Master](https://feeny.ai/job/scrum-master-excelity-herndon-p0hfn38hpqtf) — Herndon, VA
- [DevOps Engineer](https://feeny.ai/job/devops-engineer-excelity-herndon-1rb6y9em6mg6) — Herndon, VA
- [Software Developer](https://feeny.ai/job/software-developer-excelity-herndon-w7zr4rww80ks) — Herndon, VA
- [Test Engineer](https://feeny.ai/job/test-engineer-excelity-herndon-1p8k7av76jz6) — Herndon, VA
- [DevOps Engineer](https://feeny.ai/job/devops-engineer-excelity-herndon-khfjmpzh321p) — Herndon, VA
- [DevOps Engineer](https://feeny.ai/job/devops-engineer-excelity-herndon-qyhffq1ckjfd) — Herndon, VA