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quality engineer - saudi nationals only Jobs in Al Khobar

quality engineer - saudi nationals only

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quality engineer

Siemens Energy

<div><p><b>A Snapshot of your day</b></p><p>
Your day revolves around developing and maintaining quality documentation, inspection procedures, and tooling to ensure repairs meet Siemens Energy standards for OEM advanced and mature frames. It also focusses on conducting shop floor inspections, managing qualifications, preparing customer reports, and driving safety and efficiency while maintaining compliance with QMS systems and repair protocols.</p><p><b>
How You Will Make an Impact</b></p><ul>
<li>Develop and maintain quality documentation, shop inspection procedures, and tooling in accordance with Siemens Energy Repair Network standards for all OEM and qualified frames.</li>
<li>Perform shop floor quality control by conducting inspections and tests to ensure compliance with specific standards, while maintaining records of component qualifications.</li>
<li>Lead and update QMS system documents and records for the HGPR shop, ensuring compliance with repair processes and standards.</li>
<li>Prepare customer inspection reports and provide recommendations on repair scopes based on Siemens Energy repair categories.</li>
<li>Promote efficiency by completing accurate, error-free work within set timelines, adhering to HR policies, and maintaining a clean and organized workspace.</li>
<li>Drive a strong safety culture on the shop floor and collaborate with the EHS team to address and coordinate safety initiatives.</li>
</ul><p><b>
What You Bring</b></p><ul>
<li>Bachelor&rsquo;s degree in mechanical, Industrial, or Manufacturing Engineering (or equivalent) with 5+ years of experience in manufacturing or repair shop environments, preferably in Gas Turbine Component Repair.</li>
<li>Proficient in modern metrology, shop quality documentation development, engineering drawing interpretation, and critical-to-quality topics.</li>
<li>Strong communication, interpersonal, and problem-solving skills, with experience collaborating across multicultural and multinational teams, including US and German network shops.</li>
<li>Demonstrated ability to prioritize tasks, manage workloads independently, and handle multiple responsibilities effectively under pressure.</li>
<li>Sensitive to cultural, ethnic, and religious diversity, with proven integrity and high personal behavior standards.</li>
<li>Skilled in MS Office Suite and experienced in networking, negotiating, and influencing within diverse professional settings.</li>
</ul><p><b>
About the Team</b></p><p>
Our Grid Technology division enables a reliable, sustainable, and digital grid. The power grid is the backbone of the energy transition. Siemens Energy offers a leading portfolio and solutions in HVDC transmission, grid stabilization and storage, high voltage switchgears and transformers, and digital grid technology.</p><p><b>
Who is Siemens Energy?</b>
</p><p>At Siemens Energy, we are more than just an energy technology company. With ~100,000 dedicated employees in more than 90 countries, we develop energy systems of the future, ensuring that the growing energy demand of the global community is met reliably and sustainably. The technologies created in our research departments and factories drive the energy transition and provide the base for one sixth of the world's electricity generation.
</p><p>Our global team is committed to making sustainable, reliable, and affordable energy a reality by pushing the boundaries of what is possible. We uphold a 150-year legacy of innovation that encourages our search for people who will support our focus on decarbonization, new technologies, and energy transformation.
</p><p>Find out how you can make a difference at Siemens Energy: https://www.siemens-energy.com/employeevideo</p><p><b>
Our Commitment to Diversity</b></p><p>
Lucky for us, we are not all the same. Through diversity we generate power. We run on inclusion, and our combined creative energy is fueled by over 130 nationalities. Siemens Energy celebrates character &ndash; no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we do not discriminate based on our differences.
</p><p><b>Rewards/Benefits</b></p><ul>
<li>Opportunities to work with a global team
</li><li>Opportunities to work on and lead a variety of innovative projects
</li><li>Medical benefits
</li><li>Remote/Flexible work
</li><li>Access to a variety of employee resource groups
</li><li>Competitive Salary Package</li>
</ul><p>
https://jobs.siemens-energy.com/jobs</p><p>
The job posting will remain open for applications for 14 days from the posting date.</p><p>
#LI-JT1</p></div>

Quality Engineer - Saudi Nationals Only

<div><div><div><h3 class="jobSectionHeader"><b>&Uuml;ber die Aufgabe
</b></h3></div></div><div><div><div><div><b>Standort</b>
</div></div><div><div>Saudi-Arabien
</div></div><div><div>Ash Sharqiyah
</div></div><div><div>Dammam
</div></div><div><div><b>Unternehmen
</b></div><div>Siemens Energy Company Ltd.
</div></div><div><div><b>Organisation
</b></div><div>Gas Services
</div></div><div><div><b>Gesch&auml;ftsbereich
</b></div><div>Central
</div></div><div><div><b>Vollzeit / Teilzeit
</b></div><div>Vollzeit
</div></div><div><div><b>Erfahrungsniveau
</b></div><div>Berufserfahrene
</div></div><div><div><p><b>A Snapshot of your day</b></p><p>
Your day revolves around developing and maintaining quality documentation, inspection procedures, and tooling to ensure repairs meet Siemens Energy standards for OEM advanced and mature frames. It also focusses on conducting shop floor inspections, managing qualifications, preparing customer reports, and driving safety and efficiency while maintaining compliance with QMS systems and repair protocols.</p><p><b>
How You Will Make an Impact</b></p><ul>
<li>Develop and maintain quality documentation, shop inspection procedures, and tooling in accordance with Siemens Energy Repair Network standards for all OEM and qualified frames.</li>
<li>Perform shop floor quality control by conducting inspections and tests to ensure compliance with specific standards, while maintaining records of component qualifications.</li>
<li>Lead and update QMS system documents and records for the HGPR shop, ensuring compliance with repair processes and standards.</li>
<li>Prepare customer inspection reports and provide recommendations on repair scopes based on Siemens Energy repair categories.</li>
<li>Promote efficiency by completing accurate, error-free work within set timelines, adhering to HR policies, and maintaining a clean and organized workspace.</li>
<li>Drive a strong safety culture on the shop floor and collaborate with the EHS team to address and coordinate safety initiatives.</li>
</ul><p><b>What You Bring</b></p><ul>
<li>Bachelor&rsquo;s degree in mechanical, Industrial, or Manufacturing Engineering (or equivalent) with 5+ years of experience in manufacturing or repair shop environments, preferably in Gas Turbine Component Repair.</li>
<li>Proficient in modern metrology, shop quality documentation development, engineering drawing interpretation, and critical-to-quality topics.</li>
<li>Strong communication, interpersonal, and problem-solving skills, with experience collaborating across multicultural and multinational teams, including US and German network shops.</li>
<li>Demonstrated ability to prioritize tasks, manage workloads independently, and handle multiple responsibilities effectively under pressure.</li>
<li>Sensitive to cultural, ethnic, and religious diversity, with proven integrity and high personal behavior standards.</li>
<li>Skilled in MS Office Suite and experienced in networking, negotiating, and influencing within diverse professional settings.</li>
</ul><p><b>About the Team</b></p><p>
Our Grid Technology division enables a reliable, sustainable, and digital grid. The power grid is the backbone of the energy transition. Siemens Energy offers a leading portfolio and solutions in HVDC transmission, grid stabilization and storage, high voltage switchgears and transformers, and digital grid technology.</p><p><b>
Who is Siemens Energy?</b>
</p><p>At Siemens Energy, we are more than just an energy technology company. With ~100,000 dedicated employees in more than 90 countries, we develop energy systems of the future, ensuring that the growing energy demand of the global community is met reliably and sustainably. The technologies created in our research departments and factories drive the energy transition and provide the base for one sixth of the world's electricity generation.
</p><p>Our global team is committed to making sustainable, reliable, and affordable energy a reality by pushing the boundaries of what is possible. We uphold a 150-year legacy of innovation that encourages our search for people who will support our focus on decarbonization, new technologies, and energy transformation.
</p><p>Find out how you can make a difference at Siemens Energy: <b>https://www.siemens-energy.com/employeevideo</b></p><p><b>
Our Commitment to Diversity</b></p><p>
Lucky for us, we are not all the same. Through diversity we generate power. We run on inclusion, and our combined creative energy is fueled by over 130 nationalities. Siemens Energy celebrates character &ndash; no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we do not discriminate based on our differences.
</p><p><b>Rewards/Benefits</b></p><ul>
<li>Opportunities to work with a global team
</li><li>Opportunities to work on and lead a variety of innovative projects
</li><li>Medical benefits
</li><li>Remote/Flexible work
</li><li>Access to a variety of employee resource groups
</li><li>Competitive Salary Package</li>
</ul><p><b>https://jobs.siemens-energy.com/jobs</b></p><p>
The job posting will remain open for applications for 14 days from the posting date.</p><p>
#LI-JT1</p></div></div></div></div></div>

Riyadh Cables Group of Companies

<p>We are looking for QA/QC Engineer with &quot;High Voltage under ground Cable Project&quot; experience.</p><p>Should have Engineering degree (Electrical / Civil ).</p><p>6+ Years of experience is desired.</p><p>Kindly mail your CV to manawer.jilani@riyadh-cables.com</p><p>Job Type: Full-time</p><p>Application Question(s):</p><ul><li>Do you have experience of  high voltage under ground cable project.</li></ul>

QA/QC Engineer

Prince Mohammad Bin Fahd University

<div></div><div><div>Description<p></p><p><br>
AL-KHOBAR, KINGDOM OF SAUDI ARABIA</p><div>
</div><div>Position<b> </b><b>Quality Specialist &ndash; Engineering Projects</b></div><div>
Department Project Management / Quality Assurance</div><div>
Institution Prince Mohammad bin Fahd University</div><div>
Reports to Quality Manager / Project Director</div><div>
</div><div>General Description</div><div>
</div><div></div><div>The Quality Specialist ensures that all engineering project activities comply with contractual requirements, industry standards, and regulatory guidelines. This role involves monitoring construction/engineering processes, conducting inspections, ensuring proper documentation, and supporting project teams to deliver high-quality outcomes safely, on time, and within scope.</div><div>
</div><div>Qualifications &amp; Experience (Required)</div><div>
</div><div></div><ul><li> Master&rsquo;s degree in Engineering (Civil, Mechanical, Electrical, Industrial, or related field).</li><li> Professional certification in quality management (ISO 9001 Lead Auditor, Six Sigma, or CQE) is an advantage.</li><li> Proven experience in quality assurance/quality control within engineering, construction, or infrastructure projects.</li><li> Knowledge of international standards, building codes, and safety regulations.</li><li> Strong analytical and problem-solving skills with attention to detail.</li><li> Excellent communication and coordination skills with multidisciplinary teams.</li><li> Proficiency in MS Office and project management/quality management software.</li></ul><div>
</div><div><b>Key Competencies</b></div><ul><li> Technical expertise in engineering quality standards</li><li> Risk and compliance awareness</li><li> Strong documentation and reporting skills</li><li> Decision-making and problem-solving ability</li><li> Team collaboration and stakeholder management</li></ul><div>
</div><div>Duties and Responsibilities</div><div>
</div><p></p><ul><li> Develop and implement quality assurance and quality control (QA/QC) plans for engineering projects.</li><li> Monitor engineering, procurement, and construction activities to ensure adherence to specifications, standards (e.g., ISO, ASME, ASTM), and client requirements.</li><li> Conduct inspections, audits, and site visits to verify compliance with design drawings, codes, and safety regulations.</li><li> Review engineering documents, materials, and technical submittals for compliance with project specifications.</li><li> Identify non-conformities, issue reports, and coordinate corrective and preventive actions (CAPA).</li><li> Support project teams in applying risk management practices to minimize quality and safety issues.</li><li> Maintain project quality records, test results, and audit reports for compliance and future reference.</li><li> Liaise with contractors, consultants, and stakeholders to resolve quality-related concerns.</li><li> Provide training and guidance to project staff on quality standards and procedures.</li><li> Continuously monitor and recommend improvements in engineering project processes and methodologies.</li></ul><div>
</div><div>Remuneration and Benefits</div><div><br>
</div><div><br>
PMU offers an income tax-free compensation package, commensurate with rank and experience.</div><div>
</div><div>How to Apply</div><div>
</div><div></div><div>Application to this position require a letter of interest, curriculum vita (include a recent photo; state citizenship), unofficial copy of Diploma, as well as the names, addresses, phone numbers and email addresses of at least three professional references who may be contacted, with permission of the candidate, following initial evaluations by the search committee.</div><div>
</div><div>Career Portal:</div><div>
https://pmu.taleo.net/careersection/ex/jobsearch.ftl</div><div>
</div><div>Positions advertised on our job website and can be closed at the discretion of the department at any time. This position is open until filled. This employment site is updated on a regular basis. The length of the recruitment and screening process may vary from position to position, depending upon a variety of factors. Should review of your qualifications result in a decision to pursue your candidacy, you will be contacted by phone or email.</div><div><br>
Review of applications will begin immediately and</div><div>
</div><ul><li> Please mention the name of the source/website where you have seen this advertisement</li><li> Only short listed candidates will be contacted.</li></ul><div>
</div><div>Disclaimer</div><div><br>
</div><p><br>
PMU reserves the right to alter, amend and add responsibilities to this position in line with the institutional needs. Changes and amendments to this job description shall be within the academic framework and the general employment conditions.</p><div><br>
</div><div>
</div></div><div></div><div>Primary Location: Al-KHOBAR</div><div>
Job: Specialist</div><div>
Organization: Deanship of Business Development &amp; Community Service</div><div>
Schedule: Regular</div><div>
 Standard</div><div>
Job Type: Full-time</div><div>
Job Posting: Sep 21, 2025, 2:57:18 AM</div></div>

Quality Specialist – Engineering Projects

Nabors Industries

<div><p>Responsible for ensuring quality and compliance in fabrication, assembly, and inspection of Top Drive, Catwalk, and Casing Drive systems. Conducts welding inspections, WPS reviews, vendor coordination, and prepares technical reports. Supports API Q1 Audits, root cause analysis, and process improvement initiatives.</p></div>
<br><div><ul><li>Associate's degree (A.A.) or equivalent from two-year college or technical school; or nine plus years related experience and/or training; or equivalent combination of education and experience.
</li><li><p>Bachelor&rsquo;s degree in mechanical engineering.
</p></li><li><p>Minimum 7 Years experience in the field of oil and Gas.</p></li></ul></div>
<br><div><ul><li><p><b>Quality Planning </b>: Prepare quality plans and implement in coordination with departments.
</p></li><li><p><b>Inspection &amp; Testing: </b>Conduct Receiving, in-process and Final inspection for Top drive , catwalk, casing driving system and witness the factory acceptance test.
</p></li><li><p><b>Vendor &amp; Sub-Contractor Management: </b>Inspect, approve, and audit vendors and sub-contractors; support vendor development and qualification
</p></li><li><p><b>Documentation &amp; Reporting: </b>Prepare data books, Inspection Release Notes (IRN), and Non-Conformance Reports (NCR); perform root cause analysis for quality issues.
</p></li><li><p><b>After Market &amp; Sales; </b>Support customers by providing technical assistance with construction material and
</p></li><li><p><b>Calibration; </b>Responsible for ensuring availability of calibrated tools on shop floor operations.
</p></li><li><p><b>Deviation Request Co-Ordination </b>; Co-ordinate with Engineering for approval of materials substitution and exemptions proposed by vendor through VTQ system for part fabrication and servicing.
</p></li><li><p><b>Welding Oversight &amp; WPS Review: </b>Review Welding Procedure Specifications (WPS) and ensure welding activities comply with approved procedures and codes; conduct welding inspections and monitor welding quality. Review the WPS and PQR from the supplier for the supplier qualification.
</p></li><li><p><b>Audit Preparation: </b>Prepare and verify the relevant project document along with QA/QC inspector for the readiness.
</p></li><li><p>The employee is responsible for performing duties in accordance with the company&rsquo;s policies, procedures, and quality objectives.
</p></li><li><p>The employee has the necessary authority to make decisions within their scope of work and escalate issues as needed and collaborate with relevant stakeholders to ensure operational effectiveness.
</p></li><li><p>The employee is accountable for the quality, accuracy, and timeliness of their work, as well as for reporting any non-conformities or risks that may impact quality, legal compliances, safety, environment, or customer satisfaction.</p></li></ul></div>
<br><div>Nabors is a leading provider of advanced technology for the energy industry. With operations in about 20 countries, Nabors has established a global network of people, technology and equipment to deploy solutions that deliver safe, efficient and responsible hydrocarbon production. By leveraging its core competencies, particularly in drilling, engineering, automation, data science and manufacturing, Nabors aims to innovate the future of energy and enable the transition to a lower carbon world.<br>
<div></div><br>
<div><b>Equal Opportunity Employer<br>
</b></div><div></div><br>
<div>Nabors is committed to providing equal employment opportunities to all employees and applicants and prohibiting discrimination and harassment of any type without regard to race, religion, age, color, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws.&amp;nbsp; This applies to all terms and conditions of employment including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leave of absence, compensation, and training.&amp;nbsp; To learn more about our Fair Employment practices, please refer to the Nabors Code of Conduct .</div></div>

FIELD_SUPPORT.QA/QC ENGINEER I

Dar Al Riyadh

<div><p>We are seeking a highly experienced Site Architect Engineer with a minimum of 10 years of expertise in Construction supervision (CS) projects. The successful candidate will play a crucial role in overseeing architectural activities on-site, ensuring design compliance, and contributing to the successful execution of diverse projects.<br>
</p><p></p><p><b>Responsibilities:
</b></p><ul><li>Provide on-site supervision and technical guidance for architectural activities.
</li><li>Collaborate with contractors to ensure the proper execution of architectural designs.
</li><li>Ensure that architectural designs comply with approved plans, local codes, and industry standards.
</li><li>Collaborate with design teams to address any discrepancies and changes.
</li><li>Implement and enforce rigorous quality control processes to ensure the integrity of architectural installations.
</li><li>Conduct regular inspections to verify compliance with approved plans.
</li><li>Assist in the resolution of technical issues related to architectural design during construction.
</li><li>Conduct site visits to monitor and assess architectural construction activities.
</li><li>Act as a point of contact for clients regarding architectural matters on-site.
</li><li>Provide timely responses to client inquiries and concerns.
</li><li>Collaborate with multidisciplinary project teams to ensure coordinated project delivery.
</li><li>Address design coordination issues and conflicts among different engineering disciplines.
</li><li>Establish and maintain accurate records of architectural activities on-site.
</li><li>Ensure proper documentation of as-built conditions and changes.
</li><li>Stay updated on industry best practices and emerging trends in architectural engineering.
</li><li>Recommend improvements to enhance the efficiency and quality of architectural construction processes.
</li></ul><p><b>Minimum Requirements:
</b></p><ul><li>Bachelor's or Master's degree in Architecture or a related field.
</li><li>Minimum of 10 years of experience as a Site Architect Engineer in Construction supervision (CS).
</li><li>Strong knowledge of architectural design principles, codes, and standards.
</li><li>Excellent site supervision and communication skills.
</li><li>Proficient in architectural design software and tools.
</li><li>Bilingual proficiency in English and Arabic (both written and spoken).
</li><li>Professional architect license or relevant certifications.
</li><li>Experience in managing architectural activities for PMC projects within the Middle East region.</li></ul></div>

Architect Engineer

<div><div><div><h3 class="jobSectionHeader"><b>&Uuml;ber die Aufgabe
</b></h3></div></div><div><div><div><div><b>Standort</b>
</div></div><div><div>Saudi-Arabien
</div></div><div><div>Ash Sharqiyah
</div></div><div><div>Dammam
</div></div><div><div><b>Unternehmen
</b></div><div>Siemens Energy Company Ltd.
</div></div><div><div><b>Organisation
</b></div><div>Gas Services
</div></div><div><div><b>Gesch&auml;ftsbereich
</b></div><div>Service Middle East
</div></div><div><div><b>Vollzeit / Teilzeit
</b></div><div>Vollzeit
</div></div><div><div><b>Erfahrungsniveau
</b></div><div>Berufserfahrene
</div></div><div><div><p><b>A Snapshot of your day</b></p><p>
The Senior Welding Management Engineer ensures compliance with international codes, Siemens Energy standards, and customer requirements for all welding-related processes, while driving innovation and continuous improvement. This role also manages welding data systems, supplier and welder qualifications, technical documentation, and collaboration with regional and global teams to enhance local capabilities.</p><p><b>
How You&rsquo;ll Make an Impact</b></p><ul>
<li>Develop, approve, and maintain Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR), while leading welder qualification and standardizing welding practices across Siemens Energy Saudi Arabia Gas Services.</li>
<li>Support new product introductions by optimizing welding sequences and techniques, ensuring compliance with ASME, AWS, ISO, EN, and Siemens Energy internal welding standards.</li>
<li>Conduct weld inspections, audits, coordinate non-destructive testing (NDT), investigate welding non-conformities, implement corrective actions, and lead quality audits for suppliers and internal teams.</li>
<li>Implement Siemens Energy's digital welding management system for traceability, integrate welding data into digital platforms, and develop dashboards for real-time performance monitoring.</li>
<li>Evaluate and qualify welding-related suppliers, conduct capability assessments, support supplier development, and monitor their performance to ensure compliance with Siemens Energy specifications.</li>
<li>Mentor junior engineers and technicians, provide technical training to welders and production teams, research and implement advanced welding technologies, and drive initiatives to reduce defects and improve efficiency.</li>
</ul><p><b>What You Bring</b></p><ul>
<li>Bachelor&rsquo;s degree in mechanical engineering, Metallurgy, Welding Engineering, or a related field; Master&rsquo;s degree preferred.</li>
<li>International Welding Engineer (IWE) or Certified Welding Engineer (CWE); AWS CWI, ASME, or equivalent certifications; NDT Level II or III preferred.</li>
<li>Minimum of 15 years in welding engineering or quality management roles in heavy manufacturing industries such as turbines, pressure vessels, boilers, or pipelines.</li>
<li>Proven expertise with ASME, AWS, TUV, DEKRA, and ISO welding standards.</li>
<li>Proficiency in advanced welding techniques like GTAW, SAW, FCAW, and orbital welding, as well as experience with digital welding management platforms and data analytics.</li>
<li>Strong knowledge of metallurgy, heat treatment, and material science, combined with excellent problem-solving, leadership, and communication skills.</li>
</ul><p><b>About the Team</b></p><p>
Our Gas Services division offers Low-emission power generation through service and decarbonization. Zero or low emission power generation and all gas turbines under one roof, steam turbines and generators. Decarbonization opportunities through service offerings, modernization, and digitalization of the fleet.</p><p><b>
Who is Siemens Energy?</b>
</p><p>At Siemens Energy, we are more than just an energy technology company. With ~100,000 dedicated employees in more than 90 countries, we develop energy systems of the future, ensuring that the growing energy demand of the global community is met optimally and sustainably. The technologies created in our research departments and factories drive the energy transition and provide the base for one sixth of the world's electricity generation.
</p><p>Our global team is committed to making sustainable, reliable, and affordable energy a reality by pushing the boundaries of what is possible. We uphold a 150-year legacy of innovation that encourages our search for people who will support our focus on decarbonization, new technologies, and energy transformation.
</p><p>Find out how you can make a difference at Siemens Energy: <b>https://www.siemens-energy.com/employeevideo</b></p><p><b>
Our Commitment to Diversity</b></p><p>
Lucky for us, we are not all the same. Through diversity we generate power. We run on inclusion and our combined creative energy is fueled by over 130 nationalities. Siemens Energy celebrates character &ndash; no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we do not discriminate based on our differences.
</p><p><b>Rewards/Benefits</b></p><ul>
<li>Opportunities to work on and lead a variety of innovative projects
</li><li>Medical benefits
</li><li>Remote/Flexible work
</li><li>Time off/Paid holidays
</li><li>Competitive Salary Package</li>
<li>Targeted Bonus</li>
</ul><p><b>https://jobs.siemens-energy.com/jobs</b></p><p>
The job posting will remain open for applications for 14 days from the posting date.</p><p>
#LI-JT1</p></div></div></div></div></div>

Welding Management System Expert

Explore 253+ Quality engineer in Al Khobar this September. Find roles across top companies and apply now to boost your career.

253 quality engineer jobs IN Al Khobar

Quality Engineer - Saudi Nationals Only

Quality Engineer - Saudi Nationals Only

QA/QC Engineer

Quality Specialist – Engineering Projects

FIELD_SUPPORT.QA/QC ENGINEER I

Architect Engineer

Welding Management System Expert