R&D Mechanical Engineer Senior
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.
Want more jobs like this?
Get Science and Engineering jobs in Sofia, Bulgaria delivered to your inbox every week.

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!
Apply now
Current employees apply here
Perks and Benefits
Health and Wellness
- Health Insurance
- Dental Insurance
- Vision Insurance
- Life Insurance
- Short-Term Disability
- Long-Term Disability
- FSA
- HSA With Employer Contribution
- Pet Insurance
- Mental Health Benefits
- Virtual Fitness Classes
- On-Site Gym
Parental Benefits
- Fertility Benefits
- Family Support Resources
- Birth Parent or Maternity Leave
- Adoption Assistance Program
Work Flexibility
- Flexible Work Hours
- Remote Work Opportunities
- Hybrid Work Opportunities
Office Life and Perks
- Commuter Benefits Program
- Snacks
- Some Meals Provided
- Company Outings
- Holiday Events
Vacation and Time Off
- Paid Vacation
- Unlimited Paid Time Off
- Paid Holidays
- Personal/Sick Days
- Summer Fridays
Financial and Retirement
- 401(K) With Company Matching
- Performance Bonus
- Relocation Assistance
- Financial Counseling
- Stock Purchase Program
Professional Development
- Tuition Reimbursement
- Learning and Development Stipend
- Promote From Within
- Mentor Program
- Access to Online Courses
- Lunch and Learns
- Work Visa Sponsorship
- Leadership Training Program
- Internship Program
- Associate or Rotational Training Program
- Professional Coaching
- Shadowing Opportunities
Diversity and Inclusion
- Diversity, Equity, and Inclusion Program
- Employee Resource Groups (ERG)
Company Videos
Hear directly from employees about what it is like to work at Hitachi Energy.