Principal Software Engineer – MERN Stack

The P4 Senior Software Engineer (MERN Stack) at Cubic Transportation Systems is a system-level full-stack engineer who owns critical modules, shared components, or subsystems and influences both frontend and backend architecture. This role balances hands-on development with technical leadership, ensuring long-term scalability, reliability, and maintainability of enterprise-grade transportation platforms. Key responsibilities include designing and developing complex full-stack modules, driving architectural decisions within the MERN stack, defining best practices, anticipating risks, mentoring engineers, and troubleshooting production issues across system layers.

Must Have

• Design and develop complex full-stack modules and components.
• Drive MERN stack architectural decisions for frontend and backend.
• Define best practices for React, API design, and data modeling.
• Mitigate performance, scalability, and security risks.
• Mentor engineers and lead technical reviews.
• Collaborate with DevOps on deployment and reliability.
• Troubleshoot complex production issues.
• Deep expertise in MERN stack (MongoDB, Express.js, React, Node.js).
• Strong experience designing scalable full-stack systems.
• Proven ability to optimize frontend performance and backend throughput.
• Experience with cloud platforms (AWS and/or Azure).
• Strong understanding of distributed systems and enterprise application design.

Role Overview

The P4 Senior Software Engineer (MERN Stack) at Cubic Transportation Systems is a system-level full-stack engineer who owns critical modules, shared components, or subsystems and influences both frontend and backend architecture.

This role balances hands-on development with technical leadership, ensuring long-term scalability, reliability, and maintainability of enterprise-grade transportation platforms.

Key Responsibilities

• Design, develop, and own complex full-stack modules and shared components
• Drive frontend and backend architectural decisions within the MERN stack
• Define best practices for React architecture, API design, and data modeling
• Anticipate and mitigate performance, scalability, and security risks
• Mentor engineers and raise the overall engineering bar
• Lead technical reviews and influence coding standards
• Partner with DevOps and System Engineering on deployment, observability, and reliability
• Troubleshoot and resolve complex production issues across system layers
• Contribute to system-level and cross-team technical discussions

Required Skills & Experience

• 8–10 years of professional software engineering experience
• Deep expertise in MERN stack (MongoDB, Express.js, React, Node.js)
• Strong experience designing scalable full-stack systems
• Proven ability to optimize frontend performance and backend throughput
• Experience working with cloud platforms (AWS and/or Azure)
• Strong understanding of distributed systems and enterprise application design
• Experience mentoring engineers or leading technical initiatives
• Comfortable working in global, distributed teams

Success in This Role

• Systems scale and remain stable due to your design decisions
• Teams reuse components, patterns, and practices you establish
• Production issues are resolved faster because of your system knowledge
• Engineering leadership trusts your technical judgment