Sr. Software Engineer (Microservices, C++, Linux)

Full-Time, On-site in Salem, NH

About the role

Make an Impact on Mission-Critical Security Technology. We’re seeking a Senior Software Engineer to join a high-impact team supporting advanced, network-connected security screening systems. This is a hands-on role focused on stabilizing and enhancing production systems while contributing to next-generation (greenfield) capabilities. If you enjoy solving complex problems, improving real-world systems, and working across engineering disciplines—this role offers a strong balance of ownership, technical depth, and visible impact.

Responsibilities

• Architect and deliver new features that coordinate across multiple systems, designing secure and reliable inter-service communication to support them.
• Own and enhance existing production codebases.
• Contribute to targeted greenfield development as new capabilities are introduced.
• Support software releases, debugging, and issue resolution in production environments.
• Partner with systems, test, field, and manufacturing teams to resolve integration challenges.
• Create and improve technical documentation to support long-term system sustainability.

Requirements

• Experience with microservices architectures, including:
  • REST APIs, gRPC/protocol Buffers
  • Message brokers
  • Containerization
  • Securing communications channels
• Experience in C++, including multi-threading.
• Proven background working in Linux environments (must-have).
• Experience supporting distributed / networked systems in production.
• Comfortable working in and improving established codebases.

Skills

• Experience balancing system sustainment and new development.
• Strong debugging, code review, and system-level problem-solving skills.
• Background in complex, integrated environments where uptime and reliability are critical.
• Ability to operate independently while influencing technical direction.
• Passion for improving documentation and knowledge continuity.

Benefits

• Work on real-world, mission-critical technology.
• High visibility across cross-functional teams.
• Blend of stability work + forward-looking innovation.