R&D Mechanical Engineer Senior

Bulgaria·Sofiasenior

OtherR&D Mechanical Engineer

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Overview

Location:Sofia, Sofia,

Technical Tools

OtherR&D Mechanical Engineer

Sofia, Sofia, Bulgaria

2026-09-18

HITACHI ENERGY BULGARIA EOOD

Engineering & Science

Full time

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.

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.

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

~1 min read

✓13th salary;

✓Monthly food vouchers;

✓Supplementary health insurance;

✓Additional bonuses.

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!