Senior Software Engineer/Engineer II

About the Role

As a Senior Software Engineer at 4C, you'll lead the design and development of software systems that support real missions across military, industrial, and commercial domains. You'll drive technical design within an agile team, own features and components end to end, and help shape the direction of our platform — including how we build and integrate AI-driven and agentic capabilities into our simulation and training solutions. You'll mentor other engineers, raise the bar on quality and process, and take on the most challenging technical problems on the team.

Key Responsibilities

• Lead the design and development of software systems across military, industrial, and commercial domains

• Own features and components from technical design through delivery and support

• Drive technical design decisions and help break down and estimate complex work

• Design and integrate LLM-based and agentic capabilities, with attention to reliability, evaluation, and safe, predictable behavior

• Troubleshoot and resolve complex issues across the codebase and in production

• Establish and maintain testing and quality standards, including automated testing

• Lead peer code reviews and mentor more junior engineers

• Drive improvements to team processes, practices, and technical standards

About You

You bring deep technical judgment and take ownership of outcomes, not just tasks. You're a strong communicator who can align a team around a design and explain technical tradeoffs to both engineers and customers. You have a solution-oriented mindset and thrive on hard, ambiguous problems. You raise the quality of the people and systems around you, and you stay current as technology — including agentic AI — evolves quickly.

What You Bring

• Deep knowledge of core computer science and software engineering concepts

• 5+ years of experience building, deploying, and supporting Angular/Java applications

• Strong experience with Angular and web technologies such as HTML5, CSS3/SASS/LESS, ES6+, RxJS, and NgRx

• Strong experience with Java/Jakarta EE technologies such as the Servlet API, JPA, JMS, JAX-RS, JAX-WS, WebSocket API, the Spring Framework, and servlet containers (Tomcat/Jetty)

• Hands-on experience with CI/CD and container orchestration in production, using tools such as GitLab CI, Git, JUnit, Playwright, Docker, and Kubernetes

• Solid understanding of distributed computing technologies such as REST, SOAP, OpenAPI, gRPC, and Protobuf

• Experience with distributed simulation (DIS/HLA) or comparable real-time, event-driven integration work

• Strong communication, analytical, and problem-solving skills

• Demonstrated ability to mentor engineers and build lasting customer relationships

Qualifications

• Bachelor's degree in Computer Science or a related field (or equivalent experience)

• U.S. citizen with the ability to obtain a Secret security clearance

• Ability to travel internationally to work with our clients and teams

What We Value

• Experience building production LLM-based and agentic systems (tool-calling, orchestration, retrieval, evaluation), and fluency with AI-assisted development tooling

• Deep knowledge of event-driven and message-based architectures and technologies such as AMQP, Kafka, and JMS

• Hands-on experience integrating distributed simulation systems using DIS (Distributed Interactive Simulation) and HLA (High Level Architecture / IEEE 1516)

• Experience in defense, training and simulation, or other mission-critical domains