Engineering (Non-Software) jobs — page 3

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166 matches

  • Field Engineer I-II Oahu or Kauai

    QRSE LLC

    Honolulu, HIJooble

     ...Job Description Job Description Field Engineer I Core Focus: Document Control, Contract Administration, and Project Controls Foundation Overview The Field Engineer I supports construction projects under the direction of a Lead Project Engineer, Construction... 

  • HVAC Truck Based Service Controls Engineer

    Johnson Controls

    Tampa, FL$32K–$44K USDJooble

     ...projects to coordinate activities as required ethically and professionally.  Provides sketches of field changes and discrepancies for engineering corrections and drawings. May assist with job layouts and bid proposals. Install and modify software and graphics.... 

  • Construction Manager - Electrical Engineer

    APSI Construction Management

    Dallas, TX$100K–$125K USDJooble

     ...Job Description Job Description Job Title: CM-Electrical Engineer (CM-EE) Location: North Texas Veterans Healthcare System (NTXVHCS) - Dallas, Bonham, Garland TX VAMCs | 4500 S Lancaster Rd, Dallas, TX 75216 Name of Project: CM Support Services, North Texas... 

  • SHEET METAL MECHANIC (AIRCRAFT) (Title 32)

    Air National Guard Units

    Sheet Metal MechanicKelly AFB, Texas$65K–$76K USDUSAJobs

    In describing your experience in your resume, please be clear and specific. Assumptions regarding your experience will not be made. To be considered for qualification, your resume must include relevant experience with beginning and ending dates of employment/experience reflecting the following: SPECIALIZED EXPERIENCE: To qualify at the WG-10 grade level, your resume must include relevant experience with beginning and ending dates of employment experience reflecting experience or training in plan

  • Automation Engineer - Mechanical & Electrical

    Eagle Systems of Ocean Inc

    Ocean, NJJooble

     ...Job Description Job Description We are looking for: Automation Engineer – Mechanical & Electrical:  The ideal candidate will be someone who has broad experience, enjoys working with their hands, and is excellent at trouble shooting, diagnosing and resolving issues... 

  • Systems Engineer - Radar Signal Simulation & Processing

    Lockheed Martin

    Moorestown, NJJooble

     ...situational awareness, early warning, and kill assessment capabilities in the most demanding environments. Join a global team of 35 000 engineers, software developers, and cyber experts who turn complex challenges into reliable, next generation systems that keep warfighters... 

  • HVAC Controls Engineer

    Mechanical Resource Group

    Nashville, TNJooble

     ...Job Description Mechanical Resource Group , an HVAC, hydronics, sales, and service organization, is seeking an HVAC Controls Engineer with expert-level experience in Distech Controls and the Niagara N4 platform. This role is responsible for designing, programming... 

  • Quality Control Engineer, Integrated Project Quality (IPQ)

    Amazon Data Services, Inc.

    Berwick, PAJooble

    The Quality Control Engineer (QCE) plays an essential role in AWS Data Center Capacity Delivery’s (DCCD) Integrated Project Quality (IPQ) program. This position is responsible for overseeing and executing quality assurance and control (QAQC) processes throughout the lifecycle... 

  • Electrical Engineer / Building Systems Engineer

    Smith Miller Associates

    Pittston, PAhybridJooble

     ...Job Description Job Description Electrical Engineer / Building Systems Engineer - Hybrid | Ownership Track Smith Miller Associates Smith Miller Associates is seeking an Electrical Engineer to support the design of building electrical systems for a wide range... 

  • Field Engineer - States of OH & KY

    Sparks Group

    Cincinnati, OHJooble

     ...Job Description Job Description Job Summary/Company: Sparks Group is seeking a Field Engineer who will work in a rotating on-call schedule covering after hours/weekend calls and occasional overtime hours. This position requires daily travel (3-5 days a week... 

  • Senior Building Automation Field Service Engineer

    Entensiv

    Boston, MAJooble

     ...About the Role Entensiv is looking for a Senior Building Automation Service Engineer to join our growing team. This is a hands-on technical role for an experienced BAS professional who thrives on solving complex system challenges, building strong client relationships,... 

  • HVAC Specialist / Building Engineer (Commercial - Non-Union)

    Trandon Associates, Inc

    New York, NYJooble

     ...Job Description Job Description HVAC Specialist / Building Engineer (Commercial – Non-Union) We are seeking a highly skilled HVAC Specialist / Building Engineer to join the operations team at a premier Class A commercial office property. This is a non-union position... 

  • HVAC Field Service Engineer

    Havtech LLC

    Warrendale, PAJooble

     ...and equipment on assigned projects and ensuring customer satisfaction. Uses a variety of hand-tools, following blueprints or engineering specifications, to diagnose and repair units. Willing to be trained and gain proper working knowledge of the manufacturer’s service... 

  • AIRCRAFT MECHANIC

    Air National Guard Units

    Aircraft MechanicPortland, Oregon$78K–$91K USDUSAJobs

    Areas of Consideration: Area 1 - Current permanent and indefinite T32 technicians of the Oregon ANG. Area 2 - Current permanent and indefinite T5 employees of the Oregon ANG. Area 3 - Current service members in the Oregon ANG. Area 4 - Individuals in the active duty US Air Force, Air Force Reserve, or Air National Guard. Area 5 - US Citizens eligible to meet the military requirements for membership in the Oregon ANG. GENERAL and SPECIALIZED EXPERIENCE QUALIFICATION REQUIREMENTS: Work involves th

  • AIRCRAFT ORDNANCE SYSTEMS MECHANIC

    Air National Guard Units

    Aircraft Ordnance Systems MechanicPortland, Oregon$67K–$89K USDUSAJobs

    Areas of Consideration: Area 1 - Current permanent and indefinite T32 technicians of the Oregon ANG. Area 2 - Current permanent and indefinite T5 employees of the Oregon ANG. Area 3 - Current service members in the Oregon ANG. Area 4 - Individuals in the active duty US Air Force, Air Force Reserve, or Air National Guard. Area 5 - US Citizens eligible to meet the military requirements for membership in the Oregon ANG. GENERAL and SPECIALIZED EXPERIENCE QUALIFICATION REQUIREMENTS: Work involves tr

  • Controls Engineer-HVAC

    tekWorx

    Cincinnati, OHJooble

     ...individual to function as the lead technical representative for these large-scale HVAC projects. This role is ideal for a hands-on engineer who enjoys troubleshooting complex systems, takes initiative in the field, and has a strong interest in how mechanical systems,... 

  • AIRCRAFT PNEUDRAULIC SYSTEMS MECHANIC

    Air National Guard Units

    Aircraft Pneudraulic Systems MechanicPortland, Oregon$76K–$89K USDUSAJobs

    Areas of Consideration: Area 1 - Current permanent and indefinite T32 technicians of the Oregon ANG. Area 2 - Current permanent and indefinite T5 employees of the Oregon ANG. Area 3 - Current service members in the Oregon ANG. Area 4 - Individuals in the active duty US Air Force, Air Force Reserve, or Air National Guard. Area 5 - US Citizens eligible to meet the military requirements for membership in the Oregon ANG. GENERAL and SPECIALIZED EXPERIENCE QUALIFICATION REQUIREMENTS: Work involved in

  • Field Service Engineer- CNC Machine Tools

    Swift Placement & Consulting

    Wixom, MIJooble

    Job Description Job Description Can live anywhere in the Michigan Region   Methods Machine Tools is a family owned importer and distributor of high end CNC machine tools, and provider of standard and custom automation solutions. Methods offers market competitive...

  • Site Service Engineer

    Winbro Group Technologies

    Springfield, OHJooble

     ...working with some of the best global names in aerospace, medical and clean energy. We are looking for an experienced Site Service Engineer to work with our customer to ensure our products and systems provide maximum performance and to improve productivity, reliability... 

  • Field Commissioning Engineer

    Sécheron Hasler Group

    Pittsburgh, PAJooble

     ...have experience with custom electro-mechanical solutions or a passion for the electrified rail industry? This Field Commissioning Engineer role is your opportunity to join a globally recognized manufacturer specialized in DC switchgear, power conversion systems, and... 

  • Mechanical Technician

    SpaceX

    El Segundo, CAThe Muse

    SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today SpaceX is actively developing the technologies to make this possible, with the ultimate goal of enabling human life on Mars. MECHANICAL TECHNICIAN (FACILITIES)  As a member of the critical infrastructure team, you will help design, build, activate and maintain some of the world's most technically advanced manufacturing faci

  • Thermal Hardware Specialist, Casting & Leaching (Starship)

    SpaceX

    Rockledge, FLThe Muse

    SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today SpaceX is actively developing the technologies to make this possible, with the ultimate goal of enabling human life on Mars. THERMAL HARDWARE SPECIALIST, CASTING & LEACHING (STARSHIP) The Thermal Hardware Specialist is responsible for the continuous monitoring and operation of the tile production, casting, and leaching opera

  • Senior Specialist, Electrical Engineer

    L3Harris Technologies

    Anaheim, CAThe Muse

    As a Senior Specialist Electrical Engineer, the candidate must have experience with L band RF systems, able to work from customer requirements to derive additional requirements, define the architecture of a possible solution based on requirements, setup a requirements schema & link requirements to documents (systems/subsystem specification, hardware/RF architecture description document, etc.) and flow down applicable requirements to other groups (software, ASIC, & test) so that they can

  • METEOROLOGICAL TECHNICIAN - TITLE 32

    Air National Guard Units

    Meteorological TechnicianRobins AFB, Georgia$61K–$79K USDUSAJobs

    Each applicant must fully substantiate (in her/his own words) that they meet the requirements of the specialized experience listed below; otherwise, the applicant will be considered unqualified for this vacancy. DO NOT COPY THE VACANCY ANNOUNCEMENT OR THE POSITION DESCRIPTION. IF YOU DO THIS YOU WILL BE CONSIDERED UNQUALIFIED FOR THE VACANCY. Please ensure that you have included beginning and ending dates (month and year) for all jobs listed on your resume. Military Grades: E-5. Compatible Milit

  • ORDNANCE EQUIPMENT MECHANIC - TITLE 32

    Air National Guard Units

    Ordnance Equipment MechanicRobins AFB, Georgia$60K–$70K USDUSAJobs

    Each applicant must fully substantiate (in her/his own words) that they meet the requirements of the specialized experience listed below; otherwise, the applicant will be considered unqualified for this vacancy. DO NOT COPY THE VACANCY ANNOUNCEMENT OR THE POSITION DESCRIPTION. IF YOU DO THIS YOU WILL BE CONSIDERED UNQUALIFIED FOR THE VACANCY. Please ensure that you have included beginning and ending dates (month and year) for all jobs listed on your resume. Military Grades: E4-E5. Compatible Mil

  • SMALL ARMS REPAIRER

    Army National Guard Units

    Small Arms RepairingNorth Las Vegas, Nevada$72K–$84K USDUSAJobs

    In order to qualify for this position, your resume must provide sufficient experience and/or education, knowledge, skills, and abilities, to perform the duties of the specific position for which you are being considered. Education requirement is based upon the qualification standards for the specific position and is stated under the heading "EDUCATION". Your resume is the key means we have for evaluating your skills, knowledge, and abilities, as they relate to this position. Therefore, we encour

  • AIRCRAFT ENGINE MECHANIC

    Air National Guard Units

    Aircraft Engine MechanicForbes AFB, Kansas$73K–$85K USDUSAJobs

    Military Grades: E1 through E5 Compatible Military Assignments: 2AXXX GENERAL EXPERIENCE: Experience or training that has provided the ability to perform assembly and disassembly operations and make prescribed modifications to aircraft engines, engine assemblies, and accessories in accordance with technical specifications, procedures and requirements. Experience using hand and power tools common to the trade. SPECIALIZED EXPERIENCE: Must have experience or training performing standard, routine a

  • AIRCRAFT ORDNANCE SYSTEMS MECHANIC (TITLE 32)

    Air National Guard Units

    Aircraft Ordnance Systems MechanicAndrews AFB, Maryland$87K–$101K USDUSAJobs

    Permanent Change of Station (PCS): PCS not authorized Relocation Incentive: Incentive may be authorized Selected Reserve Incentive Program: Acceptance of this position will cause termination of Federal bonuses pursuant to respective Selected Reserve Incentive Programs (SRIP). This termination may be with or without recoupment of payments already made. NATIONAL GUARD MEMBERSHIP IS REQUIRED: This is an excepted service position that requires membership in a compatible military rank and assignment

  • AIRCRAFT PNEUDRAULIC SYSTEMS MECHANIC (Title 32)

    Air National Guard Units

    Aircraft Pneudraulic Systems MechanicPeoria, Illinois$66K–$77K USDUSAJobs

    AREA OF CONSIDERATION: The areas of consideration for this position, Title 32 Excepted Service (32 U.S. Code § 709), will be in the following manner and sequence: The FIRST area of consideration for this position will be all excepted permanent and indefinite temporary technicians within the ILNG. The SECOND area of consideration will be all current Federal Employees. The THIRD area of consideration will be all Federal re-employment eligible. The FOURTH area of consideration will be applicants wi

  • PLASTIC FABRICATOR LEADER (EXPERT)

    Department of the Navy - Agency Wide

    Composite/Plastic FabricatingPearl Harbor Naval Base, Oahu, Hawaii$87K–$102K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • SHIPWRIGHT LEADER (EXPERT)

    Department of the Navy - Agency Wide

    ShipwrightPearl Harbor Naval Base, Oahu, Hawaii$87K–$102K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • MARINE MACHINERY MECHANIC LEADER (EXPERT)

    Department of the Navy - Agency Wide

    Marine Machinery MechanicPearl Harbor Naval Base, Oahu, Hawaii$87K–$102K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • AIRCRAFT MECHANIC (Title 32)

    Air National Guard Units

    Aircraft MechanicPeoria, Illinois$53K–$77K USDUSAJobs

    AREA OF CONSIDERATION: The areas of consideration for this position, Title 32 Excepted Service (32 U.S. Code § 709), will be in the following manner and sequence: The FIRST area of consideration for this position will be all excepted permanent and indefinite temporary technicians within the ILNG. The SECOND area of consideration will be all current Federal Employees. The THIRD area of consideration will be all Federal re-employment eligible. The FOURTH area of consideration will be applicants wi

  • ARCHITECT

    Air Force Civilian Career Training

    ArchitectureSeymour Johnson AFB, North Carolina$55K–$84K USDUSAJobs

    In order to qualify, you must meet the specialized experience requirements described in the Office of Personnel Management (OPM) Qualification Standards for General Schedule positions, for Professional and Scientific Positions and Professional Engineering Positions. https://www.opm.gov/policy-data-oversight/classification-qualifications/general-schedule-qualification-standards/.s/#url=Group-Standards INDIVIDUAL OCCUPATIONAL REQUIREMENT: Basic Requirements: Degree: architecture; or related field

  • Boiler Plant Operator

    Veterans Health Administration

    Boiler Plant OperatingMemphis, Tennessee$57K–$66K USDUSAJobs

    To qualify for this position, applicants must meet all requirements by the closing date of this announcement. EXPERIENCE: A specific length of training and experience is not required, but you must show evidence of training or experience of sufficient scope and quality of your ability to do the work of this position. Evidence which demonstrates you possess the knowledge, skills, and ability to perform the duties of this position must be supported by detailed descriptions of such on your resume. A

  • Electronic Industrial Controls Mechanic (12 Month Register)

    Defense Logistics Agency

    Electronic Industrial Controls MechanicNew Cumberland Defense Logistics Center, Pennsylvania$62K–$73K USDUSAJobs

    Applicants will be rated in accordance with the Office of Personnel Management Qualification Standard for Trades and Labor Occupations. Although a specific length of time and experience is not required, you must meet any screen-out element listed, and show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties at the level for which you are applying. Emphasis is placed on how you gained the quality of experience, not necessarily

  • SHEET METAL MECHANIC (AIRCRAFT)

    Air National Guard Units

    Sheet Metal MechanicLincoln, Nebraska$58K–$76K USDUSAJobs

    NATIONAL GUARD MEMBERSHIP IS REQUIRED: This is a Title 32 excepted service position that requires membership in a compatible military assignment in the National Guard. Selectee will be required to wear the military uniform. Acceptance of an excepted service position constitutes concurrence with these requirements as a condition of employment. Applicants who are not currently a member of the National Guard must be eligible for immediate membership and employment in the National Guard in the milit

  • AIRCRAFT MECHANIC

    Air National Guard Units

    Aircraft MechanicCheyenne, Wyomingremote$58K–$78K USDUSAJobs

    AREAS OF CONSIDERATION: Primary consideration will be made from Areas 1, 2, 4 and 6. Area 1: All permanent and indefinite Wyoming National Guard (NG) WY ANG employees assigned to the 153 AMXS. Area 2: All permanent and indefinite Wyoming Air National Guard (ANG) T32 Dual Status technicians employed within the Wyoming Air National Guard. Area 4: All current military members of the Wyoming Air National Guard. Area 6: Current and prior military service members separated from any branch of the milit

  • AIRCRAFT PNEUDRAULIC SYSTEMS MECHANIC T32

    Air National Guard Units

    Aircraft Pneudraulic Systems MechanicTucson, Arizona$57K–$88K USDUSAJobs

    Military Grades: AB/ E-1 to SSgt/E-5 Compatible Military Assignments: Must possess or be able to obtain 2A6X4 SPECIALIZED EXPERIENCE: WG-8268-8: Must possess at least 12 months experience or training which demonstrates your knowledge of basic electrical and mechanical principles; knowledge of troubleshooting procedures used to isolate malfunctions in aircraft pneudraulic systems; and ability to use technical manuals, equipment specifications, and test calibration procedures in performing the wor

  • AIRCRAFT ORDNANCE SYSTEMS MECHANIC T32

    Air National Guard Units

    Aircraft Ordnance Systems MechanicFort Huachuca, Arizona$80K–$93K USDUSAJobs

    Military Grades: E-3/A1C to E-6/TSgt Compatible Military Assignments: Must possess 2W1X1 SPECIALIZED EXPERIENCE: Must possess 24 months of experience or training in planning and layout of repair sequence and ability to complete modification, repair, and installation of ordnance systems. Experience in diagnosing and troubleshooting malfunctions and determining remedies where complex relationships exist. Experience in hand tools and the use of a variety of measuring and test equipment. Experience

  • Marine Equipment Repairer/Operator (Dual Rate)

    U.S. Army Corps of Engineers

    Utility Systems Repairing-OperatingPortland, Oregon$63K–$82K USDUSAJobs

    About the Position: This position is aboard a hopper dredge. The Portland District's hopper dredges Yaquina and Essayons, work to ensure a safe "highway" for ships and other vessels. The hopper dredge is a specialized sea-going vessel designed to dredge and transport dredged material from ocean bars, fast flowing rivers and isolated harbors to open-water disposal areas. USACE offers a team-inspiring and collaborative work environment; providing challenging and rewarding careers across a variety

  • ELECTRONICS MECHANIC LEADER

    Department of the Navy - Agency Wide

    Electronics MechanicPoint Loma Complex, San Diego, California, San Diego, California$73K–$111K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • ELECTRICIAN LEADER

    Department of the Navy - Agency Wide

    ElectricianPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • SHIPFITTER LEADER (EXPERT)

    Department of the Navy - Agency Wide

    ShipfittingPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • WELDER LEADER (EXPERT)

    Department of the Navy - Agency Wide

    WeldingPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • SHIPFITTER LEADER

    Department of the Navy - Agency Wide

    ShipfittingPoint Loma Complex, San Diego, California, San Diego County, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • MACHINIST LEADER

    Department of the Navy - Agency Wide

    MachiningPoint Loma Complex, San Diego, California, San Diego, California$69K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • PIPEFITTER LEADER (EXPERT)

    Department of the Navy - Agency Wide

    PipefittingPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • MACHINIST LEADER (EXPERT)

    Department of the Navy - Agency Wide

    MachiningPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o

  • ELECTRICIAN LEADER (EXPERT)

    Department of the Navy - Agency Wide

    ElectricianPoint Loma Complex, San Diego, California, San Diego, California$63K–$105K USDUSAJobs

    Although a specific length of time and experience is not required for most trade and labor occupations, you must show through experience and training that you possess the quality level of knowledge and skill necessary to perform the duties of the position at the level for which you are applying. Qualification requirements emphasis is on quality of experience, not necessarily the length of time. Your qualifications will be evaluated on the basis of your level of knowledge, skills, abilities and/o