Senior Mechanical Engineer

Senior Mechanical Engineer (Hybrid)RFS Engineering is now a Salas O'Brien companyThe Senior Mechanical Engineer leads the design, coordination, and delivery of complex building HVAC and thermal energy systems. This role provides technical leadership across heating, cooling, ventilation, and control systems while managing multidisciplinary design teams and working directly with clients. Candidates with extensive HVAC systems design experience or deep expertise in building energy modeling and life-cycle cost analysis are encouraged to apply.Responsibilities:Lead the design and delivery of complex HVAC and thermal energy systems across all project phasesProvide technical leadership, mentorship, and quality oversight to mechanical design teamsDesign and coordinate thermal energy generation and distribution systems, including hot water, steam, chilled water, geothermal wellfields, water-source and air-source heat pumpsPerform and oversee engineering calculations to determine HVAC system loads using IESVE or similar toolsDesign HVAC systems including air handling, energy recovery, precision temperature and humidity control, and radiant heating and coolingDevelop building automation and control strategies to support performance, efficiency, and occupant comfortPrepare mechanical master plans and support long-term infrastructure planningSupport sustainable design initiatives and certification efforts, including LEED, LBC, PHIUS, and WELLCollaborate with architects, owners, utilities, and contractors to resolve technical challengesParticipate in client meetings, presentations, and interdisciplinary coordination effortsQualifications and Experience:Bachelor of Science in Mechanical Engineering (BSME) requiredIdeally minimum of 10 years of experience designing and leading design teams for building HVAC systemsProfessional Engineer (PE) license preferredDemonstrated experience with complex HVAC and thermal energy systems (required)Proficiency with IESVE or similar HVAC system load calculation software requiredStrong written and verbal communication skills, with comfort in client-facing environmentsProven ability to manage multiple projects, priorities, and stakeholdersLocation: Laconia, NH/ Boston, MA/ Portland, MEWork Location Type: HybridTravel: Up to 20%Compensation & Benefits:The expected base salary range for this role is $110,000 - $150,000 USD per year. Actual compensation will be determined based on a number of factors including skills, experience, qualifications, and location. This role is also eligible for performance-based bonuses and a comprehensive U.S. based benefits package, including:Medical, dental, and vision insurance401(k) with company matchPaid time off and company holidaysWellness programs and employee assistance resourcesProfessional development supportFounded in 1975, Salas O'Brien is an employee-owned engineering and professional services firm focused on achieving impact for our clients, our team, and the world. We know that tomorrow's requirements are today's opportunities, and we are here to design lasting solutions for pressing challenges.We work across a variety of industries providing integrated engineering and consulting services. Our specialized experience includes design for data centers, healthcare, science and technology, high-rise buildings, clean energy, education, and other building types as well as structural and building sciences, infrastructure asset management, advanced robotics, and more.