Senior RF / Analog Design Engineer (m/f/d)

Your mission

The future of AI computing is light, not electrons. Q.ANT is building photonic processing systems that compute with light – delivering a scalable, energy\-efficient alternative to transistor\-based architectures for next\-generation AI and HPC applications.

As Senior GHz Analog \& Mixed\-Signal Engineer (m/f/d), you are the architect of the high\-speed electronic signal paths in the GHz\-range that make photonic computing real. You will design, simulate, and validate circuits that interface directly with cutting\-edge silicon photonic devices, custom ASICs, and advanced 2\.5D/3D interposer platforms. Working at the intersection of RF electronics, electro\-optics, and semiconductor heterogeneous integration, you will turn individual high\-performance components into unified, scalable subsystems.

Your Responsibilities

• High\-Speed Analog \& Mixed\-Signal Design: Specify, design, and simulate GHz\-band circuits including TIAs, ADC/DAC front\-ends, amplifiers, and PLLs – optimizing for noise, linearity, jitter, bandwidth, and power efficiency using tools such as SPICE, SpectreRF, and ADS.


• Electronic\-Photonic Co\-Design: Define and optimize electrical\-optical impedance matching, biasing, and signal conditioning for silicon photonic components including modulators, photodetectors, and waveguide interfaces.


• Interposer \& Advanced Packaging Integration: Develop and validate 2\.5D/3D integration architectures using interposers and chiplets; co\-simulate RF parasitics, TSV routing, and thermal behavior to ensure signal integrity across heterogeneous boundaries.


• ASIC Collaboration: Partner with ASIC designers to define high\-speed interface requirements and support SerDes, CDR, and mixed\-signal block integration.


• Lab Bring\-Up \& Validation: Lead hands\-on characterization of electro\-optic bandwidth, eye diagrams, jitter, noise spectra, and system\-level behavior using oscilloscopes, VNAs, BERTs, and spectrum analyzers.


• Innovation \& IP Contribution: Propose novel analog architectures and co\-integration strategies that push beyond conventional design limits, contributing to Q.ANT's IP portfolio and next\-generation photonic processor roadmap.

Your profile

• Educational Foundation: M.S. or Ph.D. in Electrical Engineering, Physics, Microsystems Engineering, or a related technical field.


• Industry Expertise: 5\+ years designing analog/mixed\-signal circuits in the 1–20 GHz range, with strong command of SPICE/Spectre, ADS, HFSS, and S\-parameter/EM co\-simulation.


• Electro\-Optic Experience: Hands\-on background integrating electronics with silicon photonic or optoelectronic components – modulators, photodiodes, optical packaging – is a strong advantage.


• Packaging \& SI/PI Know\-How: Demonstrated experience with high\-speed PCB design, signal and power integrity analysis, and advanced packaging concepts (CoWoS, EMIB, or similar).


• Analytical Toolset: Familiarity with Python or MATLAB for measurement automation and data analysis; experience defining test SOPs for reproducibility.


• Language: Fluent English required; German or another European language is a plus.

Why us?

• We hire for attitude and train for skills.


• We encourage self responsibility and accelerate professional development.


• We move fast and encourage experimentation.


• You have the opportunity to be part of developing breakthrough photonic computing technology and have a lasting impact on the future of computing.


• You can be part of a passionate international, highly skilled cross functional team.


• You will have access to the founders of the company.

About us

Who we are and what we do

Q.ANT is a deep\-tech scale\-up developing photonic processing solutions that compute natively with light and deliver a scalable alternative to transistor\-based systems. The analog co\-processors are optimised for complex computations and enable energy\-efficient performance for next\-generation AI and HPC applications. In collaboration with the Institute for Microelectronics Stuttgart IMS CHIPS, Q.ANT operates its own pilot line for photonic chips, based on the material system Thin\-Film Lithium Niobate TFLN. Q.ANT was founded by Michael Förtsch in 2018 and is headquartered in Stuttgart, Germany.

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