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Mechanical Engineer Jobs in Puerto Rico (NOW HIRING)

RESPONSABILIDADES PRINCIPALES Asistir en los procesos de administrar, planificar, organizar, controlar y desarrollar proyectos comerciales e industriales (HVAC / Plumbing / Piping). Apoyar al ...

Supply Chain Engineering Job Sub Function: Facilities Engineering Job Category: Scientific ... Lead mechanical systems technical oversight for reliability-centered maintenance, failure ...

Validation & Engineering Group, Inc. (V&EG) a Pinnaql company is a leading services supplier who ... Supports commissioning, turnover, and startup for the process equipment and process-mechanical ...

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Mechanical Engineer information

What does a mechanical engineer do?

A Mechanical Engineer designs, develops, builds, and tests mechanical devices such as engines, machines, and tools. They use principles of physics and mathematics to solve engineering problems and improve existing products. Mechanical Engineers can work in a variety of industries, including automotive, aerospace, manufacturing, and energy. Their responsibilities often include creating blueprints, analyzing data, and collaborating with other engineers or professionals to ensure projects meet safety and quality standards.

What are the key skills and qualifications needed to thrive as a mechanical engineer, and why are they important?

To thrive as a Mechanical Engineer, you need a solid background in mechanical design, mathematics, and physics, typically supported by a bachelor's degree in mechanical engineering or a related field. Proficiency in CAD software (such as SolidWorks or AutoCAD), finite element analysis tools, and familiarity with industry standards or relevant certifications (like a Professional Engineer license) are common requirements. Strong problem-solving abilities, teamwork, and effective communication skills help professionals excel in collaborative and multidisciplinary environments. These skills are crucial for ensuring safe, innovative, and efficient engineering solutions that meet project and client needs.

What are common interdisciplinary collaborations for mechanical engineers in a typical project setting?

Mechanical Engineers often work closely with professionals from other disciplines such as electrical engineers, software developers, and industrial designers, especially when developing complex products or machinery. Collaboration is essential for integrating mechanical systems with electronics and software, ensuring functionality, safety, and efficiency. These interactions usually involve regular team meetings, joint problem-solving sessions, and coordinated testing to achieve project goals. Being comfortable working in cross-functional teams can significantly enhance your success and contribute to innovative solutions.

What is the difference between Mechanical Engineer vs Mechanical Designer?

AspectMechanical EngineerMechanical Designer
Required CredentialsBachelor's degree in Mechanical Engineering, PE license (optional)Bachelor's degree in Mechanical Design, CAD certifications (often)
Work EnvironmentDesign, analysis, testing, project managementCreating detailed CAD models, drafting, and design documentation
Industry UsageEngineering firms, manufacturing, aerospace, automotiveProduct design, manufacturing, industrial equipment

Mechanical Engineers focus on designing, analyzing, and testing mechanical systems, often overseeing projects from conception to completion. Mechanical Designers primarily create detailed CAD models and drawings based on specifications. While both roles require technical skills and knowledge of mechanical systems, Mechanical Engineers typically have broader responsibilities including analysis and project management, whereas Mechanical Designers specialize in detailed design work.

What type of jobs do mechanical engineers do?

Mechanical engineers design, develop, and test mechanical devices and systems such as engines, HVAC systems, manufacturing equipment, and robotics. They often work in industries like aerospace, automotive, energy, and manufacturing, utilizing skills in CAD software, thermodynamics, and materials science. Their roles may involve research, project management, and ensuring safety and efficiency standards are met.

What are the most commonly searched types of Mechanical Engineer jobs in Puerto Rico?

The most popular types of Mechanical Engineer jobs in Puerto Rico are:

What are popular job titles related to Mechanical Engineer jobs in Puerto Rico?

For Mechanical Engineer jobs in Puerto Rico, the most frequently searched job titles are:

What job categories do people searching Mechanical Engineer jobs in Puerto Rico look for?

The top searched job categories for Mechanical Engineer jobs in Puerto Rico are:

What cities in Puerto Rico are hiring for Mechanical Engineer jobs?

Cities in Puerto Rico with the most Mechanical Engineer job openings:

Infographic showing various Mechanical Engineer job openings in Puerto Rico as of August 2026, with employment types broken down into 90% Full Time, 8% Part Time, 1% Contract, and 1% Nights. Highlights an 97% Physical, 1% Hybrid, and 2% Remote job distribution.

Project Manager - Mechanical Engineer - WWTP

Lemartec

Guayama, PR

$87K - $118K/yr

Full-time

Re-posted 16 days ago


Job description

Overview

The Lemartec Project Manager - WWTP is responsible for managing, leading, coordinating, and administering the project from the conceptual stages through planning, engineering, procurement, construction, start-up, performance testing, initial operations, and prime contract close-out. Experience working in the construction of Waste Water Treatment Plants, including portable water distribution and pumping. Also supports customer communications and presentations. Supervises the development of budgets and schedules, manages performance, reports progress, and initiates action to assure project objectives and schedules are met, and work is performed within budget and according to specifications. 


Company Overview

Founded in 1979, Lemartec is a national general contractor and construction management firm and is part of the General Building group within MasTec’s Clean Energy and Infrastructure segment.

As MasTec’s vertical construction arm, Lemartec delivers complex projects across industrial, aviation, power, and large commercial markets. Led at the segment level by Manny García-Tuñón, the General Building Operating Group represents MasTec’s vertical construction capabilities and serves as the platform for future growth in this space.  As a MasTec company, Lemartec maintains international capabilities and strategic partnerships throughout the Americas and the Caribbean, enabling the execution of some of the most complex projects in the industries we serve. Through MasTec’s network of more than 22,000 professionals and subject-matter experts in Engineering, Procurement, and Construction across more than 400 locations throughout North America and the Caribbean, Lemartec is uniquely positioned to serve a diverse customer base.

With experience across all 16 construction disciplines, Lemartec combines deep technical expertise with the strength, scale, and financial backing of MasTec to successfully deliver projects of any size and complexity.

MasTec’s Clean Energy & Infrastructure (CE&I) segment generates over $4 billion in annual revenue, providing construction services across industrial, renewables, and infrastructure sectors. In infrastructure, we specialize in general heavy civil construction, underground utilities, structures, electrical work, material production, roadways, bridges, specialty pavement overlays, environmental projects, and commercial buildings. Sustainability and safety are foundational to our culture and influence everything we do. 

MasTec, a minority-owned Fortune 500 company, has shaped the construction industry for more than 90 years. With over 35,000 employees and 400 offices nationwide, we provide flexibility and career growth in dynamic work environments. Join one of the largest construction firms in the country (Engineering News-Record [ENR]: #1 in Power, #17 Top 50 Domestic Heavy Contractors, #20 Transportation Contractor). 


Responsibilities
  • Acts as the principal contact for the project scope of work with Customers and Lemartec management throughout the duration of the project.
  • Maintains contact with management personnel from suppliers, subcontractors, and governmental agencies as appropriate.
  • Maintains management-level relationships with other participating entities responsible for performing services in connection with the project, including organizations in the community.
  • Establishes an appropriate, integrated organizational structure, including off-project functional and specialist support.
  • Ensures scope, design basis, and objectives are defined; best practices/lessons learned are reviewed; and detailed work plans, schedules, budgets, and procedures are established, including the Project Execution Plan and Contract Management Plan. 
  • Monitors and controls all contractual commitments to ensure that all work is being performed in accordance with the specifications, drawings, and terms of the contract, that a trend program is in place, and that change orders and claims are processed in a timely manner.
  • Implements and maintains a change management control system. Ensures that all Customer communications on the prime contract are documented,
  • Conducts periodic project and Customer meetings consistent with the project communications plan to promote and facilitate communication, review progress/performance, discuss issues, and facilitate problem resolution.

Qualifications
  • Work Experience and Education

    • Bachelor’s degree in Architecture, Engineering, or Construction. An additional 5 years of relevant work experience in lieu of experience.
    • Minimum 10 Years of experience as a project manager overseeing commercial and industrial projects. Preferred 15+ years of experience.
    • Prior experience with wastewater treatment plant projects is required.
    • In-depth knowledge of all design disciplines, specifications, and drawings.

    Knowledge/Skills/Abilities

    • Familiarity with local specifications and supplements to each, and with reading blueprints
    • Proficiency in planning, scheduling, and production in P6, Microsoft Project, or equivalent software, and in the Microsoft Office suite (Excel/Word/Outlook), is also required, along with knowledge of estimating software.
    • Excellent organizational, presentation, and interpersonal skills.
    • High degree of professionalism and strong work ethic
    • Multi-task and stay focused on the big picture while addressing daily issues
  • MUST HOLD A PE

    Position may be subject to pre-employment screening, which may include background check and drug testing. Accessibility: If you need accommodation as part of the employment process, contact ceicareers@mastec.com. Due to the high volume of applications received, we are unable to respond to individual requests regarding application status. Please log in to your candidate profile for up-to-date information. 

    MasTec, Inc. is an Equal Employment Opportunity Employer. The Company's policy is not to unlawfully discriminate against any applicant or employee on the basis of race, color, sex, sexual orientation, gender identity, religion, national origin, age, disability, genetic information, military status, or any other consideration made unlawful by applicable federal, state, or local laws. The Company also prohibits harassment of applicants and employees based on any of these protected categories. It is also MasTec's policy to comply with all applicable state, federal, and local laws regarding the consideration of unemployment status when making hiring decisions.

    Disclaimer: MasTec and our Subsidiaries will never ask prospective employees for any form of payment or money transfer as part of a job application or onboarding. We do not ask prospective employees for information about credit cards or personal passwords, and we do not require applicants to purchase equipment or software. Ensure that all recruiter email addresses end in @mastec.com or @talent.icims.com. If you suspect you are the target of a scam, we advise you to contact your local law enforcement agency and report fraud at https://reportfraud.ftc.gov/.

    MasTec Clean Energy & Infrastructure and our subsidiaries do not work with any third-party recruiters or agencies without a valid signed agreement and partnership with the Corporate Talent Acquisition Team.

    #LI-LV1

    #LI-ONSITE

Qualifications:
  • Work Experience and Education

    • Bachelor’s degree in Architecture, Engineering, or Construction. An additional 5 years of relevant work experience in lieu of experience.
    • Minimum 10 Years of experience as a project manager overseeing commercial and industrial projects. Preferred 15+ years of experience.
    • Prior experience with wastewater treatment plant projects is required.
    • In-depth knowledge of all design disciplines, specifications, and drawings.

    Knowledge/Skills/Abilities

    • Familiarity with local specifications and supplements to each, and with reading blueprints
    • Proficiency in planning, scheduling, and production in P6, Microsoft Project, or equivalent software, and in the Microsoft Office suite (Excel/Word/Outlook), is also required, along with knowledge of estimating software.
    • Excellent organizational, presentation, and interpersonal skills.
    • High degree of professionalism and strong work ethic
    • Multi-task and stay focused on the big picture while addressing daily issues
  • MUST HOLD A PE

    Position may be subject to pre-employment screening, which may include background check and drug testing. Accessibility: If you need accommodation as part of the employment process, contact ceicareers@mastec.com. Due to the high volume of applications received, we are unable to respond to individual requests regarding application status. Please log in to your candidate profile for up-to-date information. 

    MasTec, Inc. is an Equal Employment Opportunity Employer. The Company's policy is not to unlawfully discriminate against any applicant or employee on the basis of race, color, sex, sexual orientation, gender identity, religion, national origin, age, disability, genetic information, military status, or any other consideration made unlawful by applicable federal, state, or local laws. The Company also prohibits harassment of applicants and employees based on any of these protected categories. It is also MasTec's policy to comply with all applicable state, federal, and local laws regarding the consideration of unemployment status when making hiring decisions.

    Disclaimer: MasTec and our Subsidiaries will never ask prospective employees for any form of payment or money transfer as part of a job application or onboarding. We do not ask prospective employees for information about credit cards or personal passwords, and we do not require applicants to purchase equipment or software. Ensure that all recruiter email addresses end in @mastec.com or @talent.icims.com. If you suspect you are the target of a scam, we advise you to contact your local law enforcement agency and report fraud at https://reportfraud.ftc.gov/.

    MasTec Clean Energy & Infrastructure and our subsidiaries do not work with any third-party recruiters or agencies without a valid signed agreement and partnership with the Corporate Talent Acquisition Team.

    #LI-LV1

    #LI-ONSITE

Education:UNAVAILABLEEmployment Type: FULL_TIME