R&D Mechanical Engineer Senior

Location: Sofia, Sofia, Bulgaria Job ID: R0144119 Date Posted: 2026-09-18 Company Name: HITACHI ENERGY BULGARIA EOOD Profession (Job Category): Engineering & Science Job Schedule: Full time Remote: No Job Description: Join Hitachi Energy and help shape the next generation of On-Load Tap Changers (OLTCs), motor drives, and transformer accessories through innovative mechanical design. As a Senior R&D Mechanical Engineer , you will lead the development of high-performance electromechanical products, transforming requirements into reliable, manufacturable, and cost-effective solutions. Working closely with cross-functional teams, you will drive product innovation, continuous improvement, and technical excellence throughout the product development lifecycle. You will play a key role in advancing technologies, solving complex engineering challenges, and ensuring the highest standards of quality and reliability. This is an exciting opportunity to make a lasting impact on critical power infrastructure while contributing to a more sustainable energy future. How you’ll make an impact Act as the lead mechanical design engineer for new product development, product upgrades, and technology development projects related to On-Load Tap Changers (OLTCs), motor drives, and transformer accessories. Develop innovative design concepts that meet customer, functional, reliability, manufacturability, cost, and serviceability requirements. Drive continuous improvement initiatives for existing products focusing on reliability, performance, manufacturability, quality, cost, and sustainability. Lead mechanical design reviews and provide technical recommendations throughout the development lifecycle. Support laboratory testing, prototype evaluations, product validation, and qualification activities. Define test objectives , test setups, acceptance criteria, and verification plans. Participate in root cause analyses of field failures, production issues, and customer complaints, identifying corrective and preventive actions. Participate in FMEA, risk assessments, and technical reviews for new products and product modifications. Collaborate closely with materials, electrical, manufacturing, quality, service, and supply chain teams. Develop and maintain design guidelines, best practices, lessons learned, and engineering standards. Your background Bachelor's or Master's degree in Mechanical Engineering or a related engineering discipline. Significant experience in mechanical design and product development within industrial equipment, power systems, electromechanical products, or related industries. Knowledge of design for manufacturability (DFM), design for assembly (DFA), reliability engineering, and cost optimization principles. Proficiency in 3D CAD modeling, engineering drawings, geometric dimensioning and tolerancing (GD&T), and product data management systems. Experience developing engineering documentation, specifications, test plans, design standards, and technical reports. Understanding of material selection, mechanical calculations, tolerance analysis, fatigue, wear, and failure mechanisms. Experience supporting prototype development, laboratory testing, product validation, qualification activities, and design verification processes. Strong analytical and problem-solving skills, including experience with root cause analysis and corrective action implementation. Working knowledge of risk assessment methodologies, including FMEA and product design reviews. Good written and spoken English . What we offer 13th salary; Monthly food vouchers; Supplementary health insurance; Additional bonuses. More about us Join Hitachi Energy and work in a team that is dedicated to creating a future where innovative digital technologies allow greater access to cleaner energy! Applications will be reviewed on an ongoing basis, so don’t delay – apply today! Accessibility and reasonable accommodation Qualified individuals with a disability may request a reasonable accommodation if you are unable or limited in your ability to use or access the Hitachi Energy career site as a result of your disability. You may request reasonable accommodations by completing a general inquiry form on our website. Please include your contact information and specific details about your required accommodation to support you during the job application process. This is solely for job seekers with disabilities requiring accessibility assistance or an accommodation in the job application process. Messages left for other purposes will not receive a response. Use of Al and automated tools in recruitment As part of our recruitment process, Hitachi Energy uses digital and automated tools, including Al-supported solutions, to assist with activities such as application screening, job matching, and interview scheduling. These tools are designed to support our recruiters and do not replace human decision-making. Candidate data is processed in accordance with applicable data protection and employment laws as well as Hitachi's Global Data Privacy Notice. Background Screening and Security Checks As part of the hiring process, Hitachi Energy conducts pre-employment background checks that may include verification of employment history, education, criminal records, and other relevant information, in accordance with applicable laws. For certain roles—particularly those involving access to sensitive information, financial responsibilities, client data, regulated environments, or security-sensitive functions—additional or more comprehensive background or security screenings may be required. These may include, but are not limited to, enhanced criminal history checks, credit history reviews (where legally permissible), sanctions screening, or other due diligence measures aligned with the responsibilities of the position. The scope and depth of any background or security review will be determined based on the nature of the role and business necessity, and will always be conducted in compliance with applicable federal, state, and local laws. Candidates will be notified and, where required, asked to provide consent prior to the initiation of any such checks.