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Senior Mechanical Engineer

Job in Portsmouth, Rockingham County, New Hampshire, 03801, USA
Listing for: Subcom, LLC
Full Time position
Listed on 2026-03-04
Job specializations:
  • Engineering
    Electrical Engineering, Systems Engineer
Job Description & How to Apply Below
Position: Senior Mechanical Engineer (4133)
Are you looking for an opportunity with plenty of growth potential? Do you enjoy working in an exciting, fast-paced, collaborative environment? Are you interested in working with the world's most innovative companies to create a more connected world?

Connecting Continents. Impacting Communities.

The backbone of the Internet is a series of high-tech subsea fiber optic cables deployed throughout the globe - Sub Com has deployed over 50% of them. Our employees ensure data communications networks are engineered, manufactured, deployed to the highest standards, enabling faster and more reliable connectivity to communities worldwide. Every member of the Sub Com team plays a role in an end-to-end process that is critical to enterprises, governments, big cities, and rural towns.

We encourage, expect, and value creativity, thoughtful risk taking, openness to change, and diverse perspectives. Whether you're a seasoned applicant seeking a new and exciting challenge, or you're new to the workforce and looking for a flexible, rewarding, and fast-paced position with an innovative and stable organization (since 1953), Sub Com has opportunities to advance your career.

Position Overview

Work as part of the engineering team focused on the design and development of optical fiber submarine cable hardware product development, with special focus on covers, seals, and pigtails for undersea network elements (UNEs).

Responsibilities

* Perform development, analysis, and testing on undersea hardware for UNE cover assemblies, seals, and pigtails. Includes new product design, process development, documentation, and qualification.

* Collaborate with teams on the implementation plan of New Product Development and Introduction (NPDI) programs for undersea cable and hardware from the concept phase through to production ramp.

* Maintain existing undersea hardware designs through Sustaining Engineering. Includes providing support to Manufacturing and performing Value Analysis/Value Engineering (VAVE) activities to maximize the functionality of designs while driving down overall cost.

* Work collectively with a team of diverse professionals including factory process engineers, reliability engineers, manufacturing operators, and program managers.

* Create and perform undersea hardware qualification testing programs of new designs.

* Write clear and concise summaries of analyses, test results, and other work output.

* Support Repeater Closure with respect to process efficiency and continuous improvement. Areas including but not limited to:
Seal assembly, seal molding, gas block assembly, cover assembly, high pressure test, TIG welding, and vacuum dry.

* Establish an expertise in special UNE interconnections such as sealed cover penetrations, optical connectors, electrical connectors, interconnect hoses, etc.

* Develop a comprehensive understanding of various materials as pertaining to structural integrity, manufacturability, and thermal management for application in deep water undersea environments.

* Exhibit a deep knowledge of high pressure test systems, TIG welding, brazing, x-ray equipment, Helium leak detection equipment and operation, polyethylene molding, etc.
Position Requirements
10+ Years work experience
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