Control Engineer for Wireless Power Transfer Systems

Willo is developing wireless power transfer that works over the air. We deliver power to devices that move and rotate freely, with no cables, no charging pads, and no line of sight between the transmitter and the device. We are one of the first teams in the world making this work at the power levels real devices need.

Our team has deep expertise in power electronics and electromagnetics, and many of us are postdoctoral researchers. One critical part is still missing: control. That is the part you would own.

Here is the opportunity. Our systems run at 6.78 MHz. Conventional WPT control is not sufficient. A new control method is required to ensure optimal operation of the wireless charging system, creating a need to hire control expertise to implement the control unit in-house. No existing method solves our issues, so the control approach has to be designed, built, and proven on real hardware. That is your work.

Willo launched in 2026 to make wireless power over the air a reality. We have raised 2.9 million euros in pre-seed funding from byFounders, Unruly Capital, Interface, and Prototype Capital. Our team includes postdoctoral researchers from Aalto University, the University of Pennsylvania, and Chiba University, working from a new office in the Merikortteli district of central Helsinki. Our ambition is to replace the last few meters of power delivery with wireless power, and to remove cables for good. We are building a generational company.

You would design and own the control unit. Its job is to hold the system at its optimal operating point for power and efficiency, even as conditions change from moment to moment. This covers the architecture, the real time firmware, the high frequency sensing, and the integration with our power stage.

You would work directly with our CTO, Nam Ha Van (PhD), in the research and technology team, alongside our power electronics and electromagnetics researchers.

You would also be our first dedicated control hire. This means you create the control capability from the start. You choose the tools and processors, define the control architecture, and decide how we develop and test real time firmware.

Bring the control unit from theory to a working, measurable unit on our hardware, able to follow the optimal operating point as the link changes. Set up the development and testing process that the rest of the team will rely on. Add the first building blocks for future telemetry and data driven control.

• A PhD in control engineering, power electronics, electromagnetics, or a related field. We will also consider a master's degree paired with strong, relevant industry experience.
• Deep experience in real time embedded control on DSPs or high performance MCUs (for example TI C2000, ADI SHARC, STM32 H7 or G4), or FPGA based equivalents.
• A solid understanding of class D, class E, class EF, and class Phi inverters, enough to specify, integrate, and debug the power stage.
• Direct experience with wireless power transfer control, where the physics and the control problem are already familiar to you.
• High frequency sensing at the MHz range: current and voltage sensing, phase and frequency tracking, synchronous sampling, and the analog front end behind them.
• Proven ownership of a control architecture on a real system, not only a contribution to one.

Nice to have: 6.78 MHz or AirFuel Resonant experience, experience tuning class E, class D, class EF, or class Phi inverters at MHz, PLL and active impedance matching for resonant systems, WPT publications or patents, or experience as a founding engineer.

• A gross monthly salary of 4,500 to 5,500 euro, depending on experience.
• Participation in our stock option plan, so you benefit as the company grows in value.
• Full relocation support to Helsinki from anywhere in the world, including relocation for your partner and children, and help with the residence permit process.
• The chance to turn Nikola Tesla's dream of wireless power into reality, with a team serious enough to do it.

We are an early stage company with global ambitions. Much of this work is new, and many of the answers do not exist yet. You will help create them. For some time, you will be the only control specialist on the team. If that prospect excites you more than it worries you, we would like to hear from you.

You can apply directly through LinkedIn. Attach your CV when you apply, since LinkedIn lets you include it with your profile. We take the rest of the process outside LinkedIn from there. If you want to add a short note on the most relevant control work you have owned, or you have any questions about the role, write to Marko at marko@willo.tech.

1. A short phone call with Marko, about 15 to 30 minutes, to get started.
2. A first round interview with two of our three founders.
3. A take home assignment related to the role itself.
4. A second round interview with all three founders, where we go through the assignment in depth.
5. A decision soon after the second round.

We are interviewing now, but we are patient. We would rather take the time to find the right person than rush the decision, because we care a great deal about who we bring into the team.

• Is this role really onsite only? Yes. The work is hands on with hardware and closely tied to a team that works together in person, so we are not offering remote or hybrid for this position.
• Do you support relocation and the residence permit? Yes. We help you and your family move to Finland and support the residence permit process. Finland has a fast specialist permit route that fits this role well.
• Can my partner and children relocate with me? Yes. Our relocation support covers them.