---
title: 'Senior Software Engineer (TS/SCI w/poly) at SixGen, Inc.'
canonical: 'https://feeny.ai/job/senior-software-engineer-ts-sci-w-poly-sixgen-inc-ft-meade-ncd2g77hhhzc'
type: 'job'
last_seen: '2026-09-07'
---

# Senior Software Engineer (TS/SCI w/poly) at SixGen, Inc.

- **Company:** SixGen, Inc.
- **Location:** Ft Meade, MD
- **Posted:** 2026-03-25
- **Last confirmed live:** 2026-09-07
- **Apply:** https://job-boards.greenhouse.io/sixgeninc/jobs/5165232008

## Job description

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape.

## POSITION OVERVIEW

Position: Software Engineer Job Type: Full-time Location: Ft. Meade, MD Clearance Requirements: Active TS/SCI with Polygraph required Work Schedule: 5 days per week onsite Travel Requirements: None Experience: 14+ years

## WHAT YOU'LL DO

We are seeking a Software Engineer to support the implementation, troubleshooting, maintenance, and ongoing support of agile software development efforts focused on modernizing systems.

This role requires applying advanced software engineering principles, theories, and concepts while contributing to the development of new approaches and solutions. The ideal candidate will tackle highly complex technical challenges, operate with significant autonomy, and provide technical leadership and mentorship to team members when needed.

## KEY RESPONSIBILITIES

Software Development

- Design, develop, modify, and implement software applications using agile development methodologies.
- Write source code for new applications and enhance existing software solutions.
- Utilize both front-end and back-end technologies to develop complete software solutions.
- Support the modernization, maintenance, and enhancement of existing systems.

Engineering & Technical Problem Solving

- Apply advanced software engineering principles to solve complex technical challenges.
- Develop innovative approaches and solutions to meet mission requirements.
- Contribute to software architecture, integration efforts, and application development activities.
- Collaborate across cross-functional teams to deliver effective solutions.

## Team Collaboration & Leadership

- Work closely with technical teams in a collaborative development environment.
- Provide guidance and mentorship to team members as needed.
- Exercise sound judgment in technical decision-making and problem resolution.
- Support both short-term and long-term development priorities.

## QUALIFICATIONS

- Bachelor's degree in Computer Science and 14+ years of software engineering experience; OR
- 18+ years of software engineering experience in lieu of a degree.
- Experience with Java and JavaScript in a Linux environment.
- Experience writing source code for new applications and enhancing existing applications.
- Experience using front-end and back-end technologies to develop complete software solutions.
- Experience designing, modifying, developing, and implementing software applications using agile methodologies.
- Experience solving complex technical problems within collaborative, cross-functional teams.
- Active TS/SCI clearance with Polygraph.

## PREFERRED QUALIFICATIONS

- Experience with Java libraries including MongoDB, Spring, and OSGi.
- Experience with Perl, Python, Lua, and NGINX.
- Experience with Git, SQL, and Software Development Lifecycle (SDLC) processes.
- Experience with web application development technologies such as AngularJS, Angular, React, Vue.js, Microsoft C#, or related technologies.
- Experience with API development, integration, client-side development, and server-side development.
- Familiarity with AWS tools and cloud-based development environments.
- Ability to work in a fast-paced, highly collaborative, and team-oriented environment while balancing competing priorities.

## COMPENSATION & BENEFITS

At SIXGEN, we are committed to fair and equitable compensation practices. Compensation for this role will be based on experience, qualifications, technical expertise, and overall alignment with the position.

Additionally, SIXGEN offers top-tier benefits for full-time employees, including:

- Employer-paid health insurance premiums (medical, dental, vision) for you and your family
- Employer-paid short/long term disability insurance and basic life/AD&D insurance
- 401K with a 4% employer contribution
- Professional development reimbursement options available (training, certification, education, etc)​
- Flexible and remote work policies for most positions
- Flexible PTO and holiday schedule

For more information, please reach out to our Director of Human Resources, Amy Maxwell at amy.maxwell@sixgen.io.

## OUR COMMITMENT

SIXGEN is an Equal Opportunity Employer. We ensure that all applicants are considered for employment without regard to race, color, religion, sexual orientation, gender identity, national origin, disability, age, marital status, ancestry, projected veteran status, or any other protected group or class.

We are committed to fostering an inclusive culture that values diversity in our people, reflecting the communities we serve and our customer base. We strive to attract and retain a diverse talent pool and create an environment where everyone is empowered to be their authentic selves at work.

## About SixGen, Inc.

## Company Overview
- **One-liner**: SIXGEN is a cybersecurity company that provides mission-aligned cyber capabilities, tools, and operations to protect government, defense, and critical infrastructure organizations from global adversaries.
- **Entity Type**: Private (acquired by Washington Harbour Partners in November 2023)
- **Headquarters**: Annapolis, Maryland, United States
- **Founded**: 2014
- **Founders**: Ethan Dietrich

## Core Business
- **Primary industry/industries**: Cybersecurity, Defense & Aerospace, Critical Infrastructure Protection
- **Target customers**: Government agencies (U.S. and allied), Defense & Aerospace contractors, Energy & Utilities, Telecommunications, Commercial Enterprises, and other Critical Infrastructure sectors (B2B, B2G)
- **Mission or purpose statement**: To reveal threats, secure operations, and empower missions. They provide the tools, automation, insights, and tradecraft needed to adapt and operate in constantly shifting threat environments with a focus on the purposeful integration of machine speed and human expertise. [sixgen.io](https://www.sixgen.io/)

## Products & Services
- **Cyber Operations Services**: Highly skilled operators conduct research, assessments, and red team operations based on real-world threats, emulating global adversaries to report detailed and actionable findings on critical assets and infrastructures.
- **Applied Research, Reverse Engineering, & RF Development**: Services that involve deep technical analysis and tool development to uncover vulnerabilities and solve complex cyber challenges.
- **Cyber Training**: Train operators to execute across the full spectrum of cyber operations.
- **Automation, AI & Data Science**: Building tools that integrate machine speed with human expertise for threat detection, data security, and scalable growth-oriented solutions.
- **Infrastructure Security**: Services focused on IT/OT visibility, proactive mitigation, automated compliance, and unified visibility for legacy and modern systems.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (acquired, so no public market cap)
- **Key Metric**: Annual Revenue of **$15.3 million** | Total Funding: **$500,000** (Seed round in 2017)
- **Notable Investors/Partners**: Parent company is **Washington Harbour Partners LP** (acquired in Nov 2023). Previously acquired **Fourcast Management and Analysis** (July 2022). Board member includes **Stu Shea**.
- **Growth Signals**: 
  - Year-over-year headcount growth of **+11.7%** (currently approximately 80 employees).
  - Active job postings have increased **+87.5% year-over-year**.
  - Expanded into the United Kingdom.
  - Secured by a private equity backer, providing capital for further expansion.

## Competitive Advantages
- **Deep Government & Defense Ties**: A large portion of their workforce comes from elite government and military backgrounds (NSA, US Air Force, US Army, US Marine Corps).
- **Mission-Focused Approach**: They position themselves as a “non-traditional defense contractor” that combines innovation with deep expertise rather than bureaucratic processes.
- **Proven Track Record of Acquisitions**: The acquisition of Fourcast Management and Analysis shows their ability to integrate new capabilities and grow through M&A.
- **Full-Spectrum Cyber Operations**: They cover the entire range from offensive cyber (CNO, CNE, Red Teaming) to defensive and intelligence operations.

## Strategic Focus
- **Post-Acquisition Growth**: Under Washington Harbour Partners, the company is aggressively hiring (87.5% more job postings year-over-year) and expanding its market reach.
- **Space & Emerging Domains**: Actively hiring for roles like "Senior Intelligence & Cyber Analyst – Space Systems," indicating a push into securing space-based infrastructure.
- **Purposeful AI Integration**: Focused on integrating AI and data science not for its own sake, but to solve specific operational challenges in threat detection and automation.
- **Industry Diversification**: While rooted in defense, they are growing their commercial offerings in energy, utilities, and telecommunications.

## Why Work Here
- **Meaningful Mission**: Employees work on “missions that matter” involving national security and critical infrastructure protection against real-world adversaries.
- **Comprehensive Benefits**: 
  - **Health**: 100% paid health, dental, and vision premiums for employees and family. HRA funds up to $3,000. Coverage starts on day one.
  - **Financial**: 4% direct employer 401(k) contribution regardless of employee participation. Short/long-term disability and basic life/AD&D insurance (3x salary up to $300k).
  - **Time Off**: Flexible time off and paid holidays. Flex time allows for work-life balance across pay periods.
  - **Leave**: Parental leave, jury duty, military leave, and voting leave.
- **Professional Development**: Support for training, certifications, and conferences (DEF CON, IITSEC, etc.).
- **Culture**: Described as valuing innovation, integrity, and purpose. High percentage of technical staff (38%).
- **Work Model**: Mix of on-site (Fort Meade, Annapolis, Reston, Sterling, Huntsville, Columbia), hybrid (DMV Area), and some remote roles.
- **Compensation**: Competitive salaries; example ranges from LinkedIn data: Software Engineer ~$121,945/year, Offensive Cyber Operator ~$92,363/year.

## Sources
1. [sixgen.io](https://www.sixgen.io/)
2. [Greenhouse Jobs at SixGen, Inc.](http://job-boards.greenhouse.io/sixgeninc)
3. [SIXGEN Careers Page](https://www.sixgen.io/careers)
4. [LinkedIn Company Page - SIXGEN](https://www.linkedin.com/company/sixgenio)
5. [Tracxn Company Profile - SIXGEN](https://tracxn.com/d/companies/sixgen/__A6y0Vd77YhuDDhLrOmjxwRZ5q2qK4dqrOLR876uKVQk)

## Other roles at SixGen, Inc.

- [Red Team Operator and Infrastructure SME](https://feeny.ai/job/red-team-operator-and-infrastructure-sme-sixgen-inc-1jmjd9t9d7am)
- [Senior Engineer, Cyber AI R&D (TS/SCI)](https://feeny.ai/job/senior-engineer-cyber-ai-r-d-ts-sci-sixgen-inc-q5zz0j7z0nsq)
- [Principal Engineer, Applied AI (TS/SCI)](https://feeny.ai/job/principal-engineer-applied-ai-ts-sci-sixgen-inc-3xbd0hppqzdh)
- [IT Specialist (TS Required)](https://feeny.ai/job/it-specialist-ts-required-sixgen-inc-sterling-es0hawa4r9da) — Sterling, VA
- [Principal Targeting Analyst-TS Required](https://feeny.ai/job/principal-targeting-analyst-ts-required-sixgen-inc-ft-meade-z2ms0a741myh) — Ft Meade, MD
- [Senior Malware Analyst (Media, Malware, and Analysis – MMA) MD TS/SCI CI POLY](https://feeny.ai/job/senior-malware-analyst-media-malware-and-analysis-mma-md-ts-sci-ci-poly-sixgen-xswbcg9zt0xf) — Ft Meade, MD
- [Senior Cost Estimator/Analyst-TS/SCI & Poly](https://feeny.ai/job/senior-cost-estimator-analyst-ts-sci-poly-sixgen-inc-annapolis-junction-qsnwzxget7j5) — Annapolis Junction, MD
- [Senior CNO Developer](https://feeny.ai/job/senior-cno-developer-sixgen-inc-annapolis-junction-m9n8g5r8dtbp) — Annapolis Junction, MD
- [Senior Red Team Operator](https://feeny.ai/job/senior-red-team-operator-sixgen-inc-huntsville-s3wj9y7z7gk4) — & Huntsville, AL
- [Portfolio Director](https://feeny.ai/job/portfolio-director-sixgen-inc-dmv-area-1q38shrt1a5q) — DMV Area