Software Engineer III - TACKLE

Epsilon Systems Solutions, Inc; San Diego (CA); On-site; USD 115,000 - 165,000; Full time

Job summary

Epsilon C5I is seeking a Software Engineer III with 4–8 years of experience for work in San Diego, CA. Join a fast-paced, team-oriented environment building and securing modern multi-level security software and web-based applications on a PaaS platform.

The role emphasizes collaboration, rigorous software design, and practical problem solving, with opportunities to work on innovative solutions for warfighter information sharing and combat effectiveness. Requires DoD eligibility and U.S.

Qualifications

• BS degree in CS or related field.
• 4–8 years of software development experience.
• Experience with large-scale distributed systems.
• Ability to obtain DoD Secret clearance; US citizenship.
• Experience with JavaScript, Java or Python.
• Experience with AI-assisted development is a plus.

Responsibilities

• Design, develop, and integrate complex software on an MLS platform.
• Collaborate with cross-functional teams to drive architecture.
• Implement web and enterprise applications and secure containers.
• Leverage AI-assisted coding tools to accelerate delivery.

Skills

JavaScript

Java

Python

Software design

Distributed systems

Team collaboration

Education

Bachelor's degree in Computer Science or related field

Job description

Software Engineer III - TACKLE

Job ID: 2026-427

Date Posted: 2026-10-30T00:00:00

Location: San Diego, California

Minimum Experience: 4 years

Education: Bachelor's Degree

Epsilon C5I (www.epsilonsystems.com/c5i), focused on software development and systems engineering for complex command, control, intelligence and combat systems, is seeking a Software Engineer III, with 4-8 years of experience, for work in San Diego, CA. Our engineering efforts provide the warfighter with common enterprise solutions to improve information sharing and combat effectiveness. If you have a passion for excellence in engineering and enjoy working on challenging projects in a fast-paced, team-oriented environment – read on!

Summary

Our software team employs an Agile Scrum process to rapidly design, code, and integrate capabilities into a mature Platform as a Service (PaaS) solution. Work involves implementing new functionality, troubleshooting, and securing containers and container platforms. The ideal person would be security-focused and interested in solving practical software challenges, building modular web applications, and collaborating with a team to turn user needs into useful features.

Duties and Responsibilities

• Participate in the design, development, implementation, and integration of complex software systems onto an MLS (Multi-level Security) platform.
• Collaborate with cross-functional teams to define and drive software architecture and design decisions.
• Collaborate with developers and stakeholders to understand business requirements and translate them into technical solutions.
• Design, develop, test, deploy, and maintain web-based and enterprise software applications.
• Rapidly translate business requirements into functional applications, prototypes, and production-ready solutions.
• Actively leverage AI-powered coding assistants to accelerate development, improve productivity, troubleshoot issues, and streamline repetitive development tasks.

Required Qualifications

• Bachelor of Science degree in Computer Science or related discipline (e.g. Software Engineering, Computer Engineering)
• Four to eight (4-8) years of professional experience involving software development and design
• Experience in designing and developing large-scale, distributed systems
• Strong communication and interpersonal skills, with the ability to collaborate effectively with cross-functional teams, gain consensus, and get things done.
• Strong expertise in one or more programming languages (e.g., JavaScript, Java, Python)
• In-depth knowledge of software engineering principles, design patterns, and best practices.
• Experience working across multiple phases of the software development lifecycle, with demonstrated ability to independently develop and deliver software solutions.
• Demonstrated experience leveraging AI-powered coding assistants to accelerate software development, improve productivity, and support efficient delivery of high-quality applications.
• Proficient in working with various operating systems such as Windows and Linux.
• Ability to obtain and maintain an Active DoD Secret Security Clearance
• Pursuant to the various government contractual requirements, all applicants must be U.S. Citizens.

Preferred Qualifications

• Ability to Obtain and Maintain a DoD Top Secret Clearance with SCI Access

Pay Range

The pay range for this role is $115,000 to $165,000 annually. This is a reasonable estimate for this role. Individual salaries are determined by a variety of factors including, but not limited to: business considerations, local market conditions, and internal equity, as well as candidate qualifications, such as skills, education, and experience.

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, standing, and walking.
• 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.

Equal employment opportunity, including veterans and individuals with disabilities.