Engineer III

Northeast Energy & Commerce Association; Maine; On-site; USD 90,000 - 130,000; Full time

Job summary

Cornerstone Energy Services, Inc. seeks an Engineer III to serve as a senior technical leader across multiple disciplines.

You will drive engineering excellence, oversee quality, and support client satisfaction on complex projects from concept through delivery. This role requires independent judgement, proactive problem solving, and the ability to mentor junior engineers while advancing business development and maintaining safety and regulatory standards.

Qualifications

• Consistently demonstrates high levels of mechanical engineering technical knowledge, ingenuity, and creativity.
• Advanced knowledge of mechanical engineering principles and practices and the ability to apply them.
• Proven experience in solving complex problems, identifying alternative solutions, and evaluating outcomes.

Responsibilities

• Provide engineering leadership to a project or discipline.
• Maintain or set Company standards for quality, production, efficiency, and public safety.
• Review engineering reports, designs, and specifications for compliance.
• Design, draft, and plan proposed projects and assess determinations for guidelines.
• Represent the Company at events and maintain client relationships.
• Lead preparation of project proposals and participate in bid walks.
• May act as team leader, hiring, assigning, and training staff.
• Oversee budget tracking and long-range tactical planning on multiple projects.

Skills

Mechanical engineering

Leadership

Project management

Problem solving

Team mentoring

Job description

Engineer III

Organization: Cornerstone Energy Services

Date Posted: 2/24/2026

City: Portland

Location: Maine

Country: United States

Primary Category: Engineering

Subcategories: Energy, Engineering

Type of Position: Full-Time

Description & Details

Cornerstone Energy Services, Inc. specializes in engineering, survey, and land solutions for the energy infrastructure sector. From initial concept through project completion, we provide comprehensive services including civil, process, mechanical, and I&E engineering; project management; survey and mapping; and right-of-way acquisition.

We Collaborate Closely With Developers And Operators Of Oil And Gas Pipelines And Electric Transmission Systems, Supporting Both Extensive Linear Projects And Site-specific Developments. Our Work Is Guided By Three Core Values

• Safety – protecting the public, our clients, and our team
• Advocacy – prioritizing the best interests of our clients
• Integrity – upholding professionalism and accountability in every aspect of our operations

Job Overview

The Engineer III serves as a senior technical leader responsible for driving engineering excellence, operational performance, and client satisfaction across complex projects and multiple disciplines. This role combines advanced engineering expertise with strategic planning, quality oversight, business development engagement, and team leadership.

An Engineer III exercises independent judgement, identifies complex challenges, and develops innovative, practical solutions that align with Cornerstone’s commitment to quality, safety and client service. This position plays a critical role in maintaining company standards, strengthening client relationships, and supporting long-term organizational growth.

Job Responsibilities

• Provide engineering leadership to a project or discipline.
• Maintain or set Company standards for quality, production, efficiency, and public safety.
• Report findings and take necessary action to correct deficiencies.
• Design, draft, and/or plan proposed projects, review engineering reports, and specifications for compliance and guidelines.
• Responsible for ensuring that the Company is current on the latest industry technology and is using the best tools available for each application. Should make recommendations to the company for improvements where necessary.
• Meticulously follow Company quality procedures and utilize quality tools. Recommend and create additional tools to improve quality performance.
• Represent the Company at job fairs and at business development events and activities, including prospective client meetings and industry events. Proactively maintain client relationships.
• Act as primary business owner of contracts
• Engages in long range tactical planning on multiple projects including tracking and budgeting.
• Maintain compliance with applicable laws, regulations, and required permits. Consult with engineers concerning design modifications for projects, and respond to inquiries concerning civil and engineer laws and practices.
• May act as a team leader by interviewing and recommending for hire, assigning, overseeing, and reviewing work, and training new employees.
• Work with the Human Resources Coordinator to hire new engineering talent and conduct performance reviews with existing employees.
• Direct and supervise other engineer’s activities.
• Lead preparation of project proposals and participate in bid walks.
• Serve as a designated client contact.
• Exercise independent initiative/judgement in setting and implementing goals.
• Independently identifies complex problems and devises optimal and innovative solutions.
• Although not the primary responsibility of this position, when needed, an Engineer III has the ability to perform the responsibilities identified in the Engineer II job description.
• Perform other duties as assigned.

Job Qualifications

• Consistently demonstrates high levels of mechanical engineering technical knowledge, ingenuity, and creativity.
• Advanced knowledge of mechanical engineering principles and practices and the ability to apply them.
• Proven experience in solving complex problems, identifying alternative solutions, project consequences of proposed actions and implement recommendations to support goals.
• The ability to generate clear and effective proposals and cost estimates.
• The ability to lead a team, or teams, of engineers, field survey crews, designers, and/or drafters to complete tasks on one or more projects.
• The ability to plan, organize, and direct the performance of a team, or teams, and the resources provided to them.
• The ability to support and carry out the various policies and procedures of the organization.
• The ability to thrive in a deadline driven environment.
• The ability to prioritize tasks based on impact.
• The ability to be flexible and adaptable to changing priorities.
• Demonstrate the ability to manage certain aspects of projects within the confines of approved budgets.