GS-12: In addition to the Basic Requirements for this position, your resume must also demonstrate at least one year of specialized experience at or equivalent to the GS-11 grade level or pay band in the Federal service or equivalent experience in the private or public sector. Specialized experience must demonstrate the following: Experience working with marine propulsion systems including gas turbines systems, steam turbine systems, medium speed diesel systems, slow speed diesel systems, and diesel electric systems. Experience managing ship life cycle plans by planning, directing and coordinating the maintenance and repair activities requiring industrial assistance for assigned ships. Experience prioritizing shipboard work requirements against life cycle plans, budgetary requirements and limitations. Experience coordinating development of test programs for overhauled equipment or for new installations of all types of shipboard equipment and systems including main machinery and boilers. GS-11: In addition to the Basic Requirements for this position, your resume must also demonstrate at least one year of specialized experience at or equivalent to the GS-09 grade level or pay band in the Federal service or equivalent experience in the private or public sector. Specialized experience must demonstrate the following: Experience working with shipboard main and auxiliary systems including main propulsion systems, electrical distribution systems, heating ventilation and air conditioning systems, refrigeration systems, firefighting systems, cargo systems, fuel systems, lubricating systems, communicating systems, seawater systems, auxiliary boiler systems, and all varieties of piping systems. Experience developing and reviewing plans, work items and cost estimates for maintenance and repair and ship alteration work for assigned ships. Experience conducting ship checks to verify the work items technical requirements and regularly work with the ships force to troubleshoot systems and technically analyze the cause of casualties. Experience supporting field inspections of shipyards to determine maintenance capabilities in advance of ship maintenance contract awards. Additional qualification information can be found from the following Office of Personnel Management website: https://www.opm.gov/policy-data-oversight/classification-qualifications/general-schedule-qualification-standards/0800/mechanical-engineering-series-0830/ Experience refers to paid and unpaid experience, including volunteer work done through National Service programs (e.g., professional, philanthropic, religious, spiritual, community, student, social). Volunteer work helps build critical competencies, knowledge, and skills and can provide valuable training and experience that translates directly to paid employment.