Senior Systems Engineer I - Largo FL in Largo, Florida at Epsilon Systems Solutions, Inc

Senior Systems Engineer I - Largo FL
Job ID: 2026-447
Date Posted: 2026-11-09T00:00:00
Location: Largo, Florida
Minimum Experience: 6 years
Education: Bachelor's Degree

Epsilon C5I (www.epsilonsystems.com/c5i), a division of Epsilon Systems Solutions, is a 100 percent employee-owned company founded in 1998 with more than 20 locations serving the Department of Defense, Department of Energy, Department of Homeland Security, non-profit and commercial customers.

Epsilon C5I currently seeks to hire a Sr Systems Engineer to support programs related to US DOD activities.

Summary:
As a Sr Systems Engineer, you will be a member of an Integrated Product Team (IPT) responsible for the architecture, integration, security, and performance of complex networked systems, including IP voice and Unified Communications (UC) capabilities. Working alongside software engineers on system administration, identity management, Public Key Infrastructure (PKI), and application development, you will define system requirements and architectures, lead network and voice system integration, drive vulnerability management and cybersecurity compliance, and support integration, test and evaluation, and system qualification activities.

Successful candidates must be able to work independently and as part of a technical team and have effective oral and written communication skills. Successful candidates will also possess strong problem solving and critical thinking skills. This challenging position requires a diverse set of technical and task management skills and allows for the opportunity to contribute immediately to important, meaningful work. An active DoD Top Secret Security Clearance is required. Work is performed onsite in Largo, FL.

Duties and Responsibilities:

• Translate customer needs into testable and verifiable system requirements, and maintain requirements traceability using tools such as DOORS

• Develop system and network architectures, interface definitions, and design documentation for complex networked systems integrating voice, video, and data services

• Design, configure, and maintain network infrastructure, including routers, switches, LANs, and WANs (Cisco and/or Juniper)

• Architect and integrate voice and Unified Communications (UC) systems, including call signaling (SIP), media transport (RTP/SRTP), codecs, and session border controllers

• Analyze and optimize voice and video quality and network performance using Quality of Service (QoS) design, traffic analysis, and protocol analysis tools such as Wireshark

• Conduct vulnerability scanning using Nessus/Tenable (ACAS), analyze results, and recommend and track remediation strategies, including Plans of Action and Milestones (POA&Ms)

• Apply and verify security best practices and industry standards (e.g., DISA STIGs, NIST SP 800-53, Risk Management Framework) across IP networks, voice systems, and software development activities

• Collaborate with software engineers on the integration of hardened operating system images, PKI, user authentication and domain services, back-end services, and user interfaces into the overall system

• Conduct trade studies and provide recommendations on technologies, products, and system design approaches

• Develop test plans and procedures, and support integration, verification and validation, fault isolation, and system qualification testing

• Provide technical leadership and mentoring to junior engineers

• Participate in a highly collaborative team environment, contributing to all phases of the development lifecycle using Agile/Scrum methodologies

• Communicate with stakeholders such as other program personnel, government customers, and senior leadership

Required Qualifications:

• Bachelor’s degree in Electrical Engineering, Systems Engineering, Computer Engineering, Computer Science, or other closely related Science, Technology, Engineering or Mathematics (STEM) field.

• Six or more (6+) years of prior relevant experience in systems engineering, network engineering, or systems development, or an advanced degree in a related field and minimum 4+ years prior experience

• In-depth knowledge of TCP/IP, routing protocols, subnetting, switching, LANs, and WANs

• Hands-on experience configuring and maintaining routers and switches

• Advanced knowledge of voice and video protocols, with expertise in signaling, media transport, optimizing audio quality, and enhancing network performance

• Proficiency with vulnerability scanning tools (e.g., Nessus, Tenable) and the ability to analyze scan results and recommend remediation strategies

• Strong understanding of best practices and industry standards for system security across IP networks, voice systems, and software development

• Experience with or knowledge of agile development methodologies

• Must have strong written communication skills, possess good people skills, demonstrate strong attention to detail and have the desire to work on a highly focused technical team of engineers

• Possess effective communication and be able to collaborate with Customers, and cross-functional teams, document technical processes, and present solutions to stakeholders.

• Must be able to prioritize tasks effectively, manage deadlines, and handle multiple projects simultaneously.

• Excellent organizational skills and keen attention to detail, with the ability to multitask and prioritize effectively in a fast-paced, dynamic work environment.

• Enthusiasm for learning and adapting to new technologies and methodologies.

• Pursuant to the various government contractual requirements, all applicants must be U.S. Citizens.

• Applicant must have an active DoD Top Secret Security Clearance.

• Applicant must reside within commuting distance to Largo, FL or willing to relocate to the area.

Preferred Qualifications:

• Experience with enterprise UC platforms such as Cisco Unified Communications Manager (CUCM), Cisco Webex, or Microsoft Teams Phone

• Familiarity with Linux and Windows administration, including patching, hardening, and image creation

• Familiarity with Public Key Infrastructure (PKI), user authentication, and Active Directory/domain controller administration

• Familiarity with Board Support Package (BSP) integration and embedded systems

• Experience in Python, Bash, or PowerShell for scripting and automation

• Experience with Model-Based Systems Engineering (MBSE) tools and modeling languages (e.g., Cameo, Rhapsody, SysML)

• Professional certifications such as CCNP Enterprise, CCNP Collaboration, or equivalent

• CompTIA Security+

ADA Notations:

• Regular communication (hearing/speaking).

• Noise conditions range from very quiet to very noisy.

• Prolonged use of computer (typing/keyboarding).

• Frequently required to sit for long periods of time, stand, and walk.

• Ability to travel by car, air or other means of transportation, if required.

Epsilon Systems Solutions, Inc. is an equal opportunity employer. Qualified candidates will be considered without regard to legally protected characteristics.