Senior Mechanical Design Engineer (onsite)

About Johnson Controls 
Johnson Controls, a global leader in thermal management, mission-critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education.  

For more than 140 years, Johnson Controls has delivered performance where it really matters. Backed by advanced technology, lifecycle services and an industry-leading field organization, we elevate customer performance, turn goals into real-world results and help move society forward.  

Visit johnsoncontrols.com for more information and follow @Johnsoncontrols on social platforms.  

What you will do
Johnson Controls is seeking a Senior Mechanical Design Engineer! In this role, you will be responsible for mechanical analysis, detailed design, subsystem integration, and overall mechanical performance of HVAC equipment across Enviro‑Tec air-handling, fan-coil, and blower-coil platforms. You'll support new‑product development, sustaining engineering, prototyping, laboratory validation, and manufacturing execution. You will have the opportunity to collaborate closely with electrical, controls, test lab, compliance, sourcing, product management, and operations teams to deliver market‑leading, safe, compliant, serviceable, and cost‑effective HVAC products.

You will lead complex and exciting mechanical development efforts—spanning sheet metal design, thermal/fluid performance, air‑moving systems, heat‑exchanger integration, mechanical safety features, A2L refrigerant adaptations, structural integrity, DFMEA, and field‑service considerations—while contributing technical leadership across NPD teams.

This position is onsite based in Largo, FL. Candidates must be commuting distance to the facility, or able to relocate. Johnson Controls offers various relocation packages depending on your needs.

How you will do it

• Mechanical Design & System Integration
• Perform mechanical analysis and detailed design for AHUs, FCUs, BCUs and related subsystems including sheet metal, enclosure structures, panels, fan/motor assemblies, coil integration, and airflow pathways.
• Develop innovative design solutions for custom HVAC equipment based on customer-specific requirements and product performance targets.
• Execute design improvements that optimize manufacturability, serviceability, acoustics, energy efficiency, and product quality.
• Create and maintain mechanical engineering standards, CAD models, technical documentation, and design specifications.
• Develop design rules and logic used in configurable/dynamic BOM generation.
• Mechanical Compliance, A2L Adaptation & Safety Requirements
• Interpret and implement UL 60335-2-40 mechanical safety and A2L refrigerant requirements for clearances, airflow paths, compartment construction, and enclosure integrity.
• Coordinate with compliance partners and agencies (e.g., Intertek/ETL) to validate mechanical requirements and securement tests.
• Ensure mechanical designs meet relevant safety, installation, and regulatory standards.
• Lab Validation, Prototypes & Testing
• Define and execute test plans in partnership with the Largo Test Lab (airflow performance, thermal testing, vibration, structural integrity).
• Lead prototype builds and fit‑up verification for assembly feasibility and service access.
• Oversee testing of fans, motors, mechanical components; analyze data and drive corrective actions.
• Manufacturing, Sourcing & Cross‑Functional Collaboration
• Support manufacturing engineering with BOMs, routings, assembly sequencing, and DFM/DFA improvements.
• Evaluate mechanical vendors and qualify new components including fans, bearings, heating elements, insulation materials, and assemblies.
• Provide mechanical guidance to marketing, applications, sales engineering, service, and field teams.
• Generate clear and accurate drawings, installation details, and mechanical instructions.
• Support PFMEA reviews, root‑cause analyses, corrective actions, and engineering change processes.
• Maintain consistency with Largo drafting/documentation standards and mentor drafters/designers.

What we look for
Required

• Bachelor’s Degree in Mechanical Engineering.
• 5+ years of mechanical engineering experience in product development.
• 5+ years of 3D CAD software experience.
• Experience designing sheet‑metal assemblies.

Preferred

• HVAC industry experience
• Experience with lab testing, vibration/structural analysis, acoustics, or CFD.
• Knowledge of sheet-metal fabrication, brazing/welding, fastening, gasketing, and insulation.
• Understanding of DFMEA, DFM/DFA, cost modeling, and value engineering.
• Experience with configurable platforms and dynamic BOM logic.
• ·Cross‑functional experience with test labs, compliance, sourcing, and service.
• Understanding of thermodynamics, heat transfer, and airflow fundamentals.
• Preferably fan/motor systems, coil integration, heater assemblies, and structural components.

HIRING SALARY RANGE: $100,000 - $125,000 (Salary to be determined by the education, experience, knowledge, skills, and abilities of the applicant, internal equity, and alignment with market data.) This role offers a competitive Bonus plan that will take into account individual, group, and corporate performance. This position includes a competitive benefits package. The posted salary range reflects the target compensation for this role. However, we recognize that exceptional candidates may bring unique skills and experiences that exceed the typical profile. If you believe your background warrants consideration beyond the stated range, we encourage you to apply. To support an efficient and fair hiring process, we may use technology assisted tools, including artificial intelligence (AI), to help identify and evaluate candidates. All hiring decisions are ultimately made by human reviewers. For details, please visit the About Us tab on the Johnson Controls Careers site at https://jobs.johnsoncontrols.com/about-us

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Johnson Controls International plc. is an equal employment opportunity and affirmative action employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, genetic information, sexual orientation, gender identity, status as a qualified individual with a disability or any other characteristic protected by law. To view more information about your equal opportunity and non-discrimination rights as a candidate, visit EEO is the Law. If you are an individual with a disability and you require an accommodation during the application process, please visit here.