RF Design Engineer

Join Coherent and Shape the Future of High-Speed Optical Communications

At Coherent, we are driving innovation in photonics and semiconductor technologies that power the next generation of communication networks. We are looking for an experienced RF Design Engineer to join our growing team in Järfälla, Sweden, and contribute to the development of cutting-edge high-speed optoelectronic devices.

This is an opportunity to work in a highly collaborative environment where research, design, manufacturing, and product development come together to create industry-leading solutions.

About the Role

As an RF Design Engineer, you will play a key role in the design, modelling, characterization, and optimization of high-speed integrated optoelectronic devices. You will combine advanced RF engineering expertise with hands-on laboratory work to ensure our products meet demanding performance requirements.

Working closely with cross-functional teams across Design, Process Engineering, Operations, and Project Management, you will help transform innovative concepts into high-performance products ready for industrial deployment.

Key Responsibilities

• Design high-speed integrated optoelectronic devices such as electro-absorption modulators, Mach-Zehnder modulators, and related packaging solutions.
• Model RF characteristics and signal integrity to predict device performance in real-world applications, including drivers and interconnects.
• Perform advanced RF, microwave, and optoelectronic characterization to validate designs and support continuous optimization.
• Design, specify, and implement test methods and procedures for performance evaluation.
• Contribute to technology platform selection and technical solution development.
• Act as a technical expert within development projects and support product specification activities.

What We're Looking For

Required Qualifications

• PhD, or MSc with at least 5 years of relevant industry experience, with significant experience in RF, microwave, semiconductor, optoelectronic, or electrical engineering.
• Strong technical background in:
  • RF engineering
  • Signal integrity
  • High-speed electronics
  • Optoelectronic devices
  • Numerical modelling and simulation
• Hands-on experience with RF and microwave test equipment and methodologies for wafer-level and chip-level characterization.
• Experience performing laboratory validation, measurement, and troubleshooting of high-speed devices.
• Fluent in English, both written and spoken.

Preferred Qualifications

• Experience working with integrated photonics and semiconductor technologies.
• Knowledge of optical communications systems and device packaging.
• Swedish language skills are advantageous but not required.

Who You Are

You are a technically curious and driven engineer who enjoys solving complex problems and turning innovative ideas into practical solutions.

You thrive in collaborative environments, communicate effectively with both technical and non-technical stakeholders, and enjoy working at the intersection of design, testing, and manufacturing. You bring structure to your work, take initiative, and are constantly looking for ways to improve products and processes.

Most importantly, you are excited by the opportunity to work with pioneering technologies that help shape the future of photonics and high-speed communications.

Why Join Coherent?

We offer:

• A dynamic and international working environment.
• The opportunity to work with world-class experts in photonics and semiconductor technology.
• Unique technical challenges with products that define tomorrow's communication infrastructure.
• A collaborative and supportive company culture built on 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 us and help push the boundaries of what's possible in photonics and high-speed optoelectronics.