Semiconductor Design Engineer

Shape the Future of Semiconductor Photonics at Coherent

At Coherent, we develop advanced photonic and semiconductor technologies that power next-generation communication networks. We are looking for a Semiconductor Design Engineer to join our team in Järfälla, Sweden, and contribute to the design and development of high-performance optoelectronic devices.

This is an exciting opportunity for an engineer or researcher with a strong background in semiconductor physics and device modeling who wants to work closely with industry-leading experts and directly influence future products.

About the Role

As a Semiconductor Design Engineer, you will be responsible for modeling, designing, and characterizing advanced optoelectronic devices such as quantum-well-based lasers and modulators. You will play a key role in translating theoretical concepts into practical device designs while supporting verification, optimization, and performance improvements through modeling and laboratory validation.

Working across design, fabrication, and product development teams, you will help drive innovation in semiconductor photonics from concept to product realization.

Key Responsibilities

• Model and simulate advanced semiconductor optoelectronic devices, including quantum-well-based lasers and modulators.
• Develop numerical models to support device design optimization and performance prediction.
• Design dedicated test structures to extract critical material and device parameters.
• Define and develop test methods and characterization strategies for device verification.
• Analyze experimental results and feed findings back into the design process to enable continuous optimization.
• Contribute to next-generation device development.

What We're Looking For

Required Qualifications

• PhD, or MSc with a minimum of 5 years of relevant professional experience in:
  • Semiconductor devices
  • Optoelectronic devices
  • Semiconductor physics
  • Photonics engineering
• Strong understanding of semiconductor device operation and physics.
• Experience with numerical modeling and simulation of semiconductor or optoelectronic devices.
• Fluent in English, both written and spoken.

Technical Expertise

We are looking for candidates with expertise in:

• Semiconductor materials and device physics
• Optoelectronic devices and technologies
• Numerical modeling and simulation
• Quantum-well-based device structures
• Semiconductor laser and modulator design
• Experimental characterization and device verification

Who You Are

You are passionate about semiconductor technology and enjoy solving complex technical challenges. You combine analytical thinking with a hands-on approach and are motivated by seeing innovative concepts become real-world products.

You thrive in collaborative environments, communicate effectively with colleagues across disciplines, and enjoy working at the intersection of research, modeling, and experimental validation.

Most importantly, you are driven by curiosity and a desire to push the boundaries of semiconductor photonics technology.

Why Join Coherent?

We offer:

• A dynamic and international working environment.
• Collaboration with highly skilled experts in semiconductor and photonic technologies.
• The opportunity to work on innovative products that will shape tomorrow's communication systems.
• Challenging technical problems and significant opportunities for professional growth.
• A supportive and collaborative culture built around our ICARE values:
  • Integrity – Create an Environment of Trust
  • Collaboration – Innovate Through the Sharing of Ideas
  • Accountability – Own the Process and the Outcome
  • Respect – Recognize the Value in Everyone
  • Enthusiasm – Find a Sense of Purpose in Work
• Competitive compensation and benefits.

Join Coherent and help develop the next generation of semiconductor and optoelectronic technologies.