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.