About the role: The Senior Applications Engineer provides advanced technical support, application development, integration, troubleshooting, and quality review for DDC/BMS/BAS control system projects. This role supports complex BAS network configuration, gateway integration, customer-facing technical discussions, portfolio standards, and issue resolution for active and existing sites. This position requires mature judgment, technical depth, independent problem-solving, and the ability to mentor others while supporting consistent, high-quality department output. The Senior Applications Engineer also performs the core responsibilities of the Applications Engineer role while preparing for broader technical leadership responsibilities. Key Responsibilities: Advanced Technical Application & Integration Troubleshoot and assist with BMS network setup, configuration, connectivity, and related system issues. Create gateway configurations used between Modbus and BACnet networks. Develop and support control system databases, interfaces, programming, and related deliverables for sequences of operation and project requirements. Provide customer-requested changes, updates, and enhancements to existing databases and application files. Support Service Teams with issues on existing sites and older projects, including technical investigation and resolution recommendations. Technical Leadership & Quality Review Review standards across portfolios and help ensure consistent, high-quality output across assigned work. Attend and provide technical input as needed in customer-facing meetings. Support, coach, and guide Applications Engineers and Associate Application Engineers on technical tasks, documentation, and project workflows. Shadow and collaborate with the Lead Applications Engineer to learn direction, workflow management, and leadership practices. Project Execution & Department Support Debug installation issues during static and dynamic start-up and commissioning of building controls and special systems. Provide input to sales staff as requested or required to assist in accurate estimation, design, installation, start-up, commissioning, and training for building systems. Communicate technical risks, missing information, status updates, and required decisions to appropriate stakeholders in a timely manner. Maintain organized project documentation, revisions, database support materials, and technical notes throughout the project lifecycle. Qualifications: Working knowledge of commercial HVAC, building automation systems (BAS), DDC/BMS controls, and related control sequences. Ability to read and interpret project specifications, sequences of operation, drawings, equipment submittals, and controls documentation. Familiarity with BACnet and Modbus communication protocols and BAS network concepts. Clear understanding of computer and BAS networks, including device addressing, connectivity, and troubleshooting fundamentals. Strong analytical, technical problem-solving, communication, organization, and time-management skills. Ability to work independently and collaboratively in a fast-paced project environment while maintaining a high degree of integrity and accountability. Experience with Delta Controls preferred; experience with Reliable Controls, KMC, Siemens, or similar product lines is a plus. Experience with EPMS integration, MSA FieldServer Protonode, Python, JavaScript, or other line-based coding is a plus. Experience 5+ years of experience programming BAS/DDC systems and integrating with third-party equipment preferred. Advanced troubleshooting experience with BAS networks, BACnet, Modbus, gateway configuration, commercial HVAC systems, and commissioning support preferred. Experience with mission-critical sites, data center environments, EPMS integration, Delta Controls, Reliable Controls, KMC, Siemens, or similar product lines strongly preferred.