Full-Time

Senior Software Engineer

SixGen

SixGen

51-200 employees

Adversarial emulation and cyber operations

No salary listed

No H1B Sponsorship

Odenton, MD, USA

In Person

On-site 5 days per week; active TS/SCI with Polygraph required.

US Top Secret Clearance Required

Bachelor's

Category
Software Engineering
Required Skills
Agile
JavaScript
Java
Linux/Unix

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Requirements
  • 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.
Responsibilities
  • 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.
  • 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.
  • 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.
Desired 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.

SIXGEN provides cybersecurity services to government, defense, critical infrastructure, and commercial sectors, including adversarial emulation, incident response, penetration testing, reverse engineering, cyber training, and applied research. Its flagship product, RAVEN, is a DoD-certified, high-performance cyber operations platform that ships as a pre-configured computing node with AI-enabled threat detection and response. The company acts as a prime contractor for the Department of the Navy and as a subcontractor for major defense contractors, expanding through acquisitions to strengthen software infrastructure, electronic warfare, and reverse engineering capabilities. Its goal is to deliver mission-ready cyber solutions with speed and operational advantage as a non-traditional defense contractor owned by private equity, protecting critical assets and national security.

Company Size

51-200

Company Stage

Seed

Total Funding

$500K

Headquarters

Baltimore, Maryland

Founded

2014

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Simplify Jobs

Simplify's Take

What believers are saying

  • OASIS+ small-business award in December 2024 expands federal ordering pathways through 2029.
  • MDA SHIELD selection in December 2025 signals relevance for large defense programs.
  • Secure-EE and Boldend broaden software, data, and electronic warfare offerings for cross-selling.

What critics are saying

  • SIXGEN’s 2024 acquisition spree creates integration drag across Secure-EE, Boldend, and Kyrus Tech.
  • Heavy federal dependence exposes revenue to DoD procurement delays and budget reprogramming cycles.
  • If Washington Harbour’s roll-up fails, SIXGEN loses acquisition fuel and strategic differentiation.

What makes SixGen unique

  • SIXGEN combines cyber products, operations, and electronic warfare under Washington Harbour’s acquisition platform.
  • Jack Wilmer, former DoD cybersecurity leader, joined in April 2024 and sharpened federal credibility.
  • Board additions Andrew Boyd and Charles Moore strengthen intelligence and combat-networking relationships.

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Benefits

Health Insurance

Dental Insurance

Vision Insurance

Disability Insurance

Health Savings Account/Flexible Spending Account

401(k) Retirement Plan

Flexible and remote work policies for most positions

Flexible PTO and holiday schedule

Professional development reimbursement options available (training, certification, education, etc)

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

-1%

2 year growth

0%
Business Wire
Dec 3rd, 2024
Kyrus Tech and SIXGEN Join Forces to Create Preeminent Mid-Tier Across the Digital Battlespace

SIXGEN, a full-spectrum solutions provider across the digital battlespace to U.S. national security and critical infrastructure sectors, announced tod

Business Wire
Aug 7th, 2024
SIXGEN Acquires Boldend to Advance Innovation in US Defense and National Security

SIXGEN, a full-spectrum provider of cyber products, operations, and solutions to the U.S. national security and critical infrastructure sectors, annou

Technical.ly
Jul 9th, 2024
Baltimore Daily Roundup: Teaching Tech Leaders About Art; $1B For Free Med School At Johns Hopkins; Hospital Cyberattacks

What humanities can do for tech leaders. Rishi Jaitly, a Virginia Tech professor and advisor for OpenAI whose resume includes stints at some of the world’s biggest tech companies, sees the arts and related fields as crucial to the tech sector — and not opposed or tangential to it. “A world in which the humanities are more accessible and available,” Jaitly said, “is a world that’s more curious [and] more compassionate.”

Business Wire
Jul 3rd, 2024
SIXGEN Acquires Secure-EE

SIXGEN, a full-spectrum solutions provider of cybersecurity products and expertise to U.S. national intelligence, defense and critical infrastructure

Business Wire
May 13th, 2024
Sixgen Attracts Renowned Leaders To Board, Reinforcing Its Role At The Forefront Of Cyber And National Security

ANNAPOLIS, Md.--(BUSINESS WIRE)--In a significant endorsement of its leadership in cybersecurity across the digital battlespace, SIXGEN is proud to announce the appointment of two distinguished figures – Andrew Boyd and Lt. Gen. Charles Moore – to its board of directors. Mr. Boyd most recently served as the Director of the CIA’s Center for Cyber Intelligence, and Lt. Gen