Analog / Mixed-Signal IC Design Engineer, Brain-Computer Interfaces

ABOUT THE ROLE AND TEAM Quantum Motion is a fast-growing quantum computing start-up based in London. We are developing quantum processors based on industrial-grade silicon chips, with the potential to radically transform computing power in areas such as materials modelling, medicine, artificial intelligence and more. We have recently moved into a new office in Islington with state of the art cryogenic facilities and have an outstanding interdisciplinary team spanning quantum physics to IC design. Since 2021 our team has been listed every year in the “Top 100 Startups worth watching” in the EE Times, and our technology breakthroughs have been featured in The Telegraph, BBC and the New Statesman. Our founders are internationally renowned researchers from UCL and Oxford University who have pioneered the development of qubits and quantum computing architectures. Our chairman is the co-founder of Cadence and Synopsys, the two leading companies in the area of Electronic Design Automation. We’re backed by a team of top-tier investors, and we have recently closed our Series C funding of $160 million. We bring together the brightest quantum engineers, integrated circuit (IC) engineers, quantum computing theoreticians and software engineers to create a unique, world-leading team, working together closely to maximise our combined expertise. Our collaborative and interdisciplinary culture is an ideal fit for anyone who thrives in a cutting-edge research and development environment focused on tackling big challenges and contributing to the development of scalable quantum computers based on silicon technology. Our team of 100+ is based in Oxford and London, with a centre of mass in our Islington lab. OUR TEAM The IC Team is responsible for the design and test of the integrated circuits which operate at deep-cryogenic temperatures and interact with the qubits. This role is a unique chance to work at the bleeding edge of technology development where you will measure, optimise, and analyse the performance of innovative circuits to tackle the engineering challenge of implementing a large-scale quantum computer in silicon. This is a rare and exciting opportunity to be an early employee at a start-up shaping the future of quantum computing. There are vast opportunities for professional growth and to make an impact within the company.  FUNCTIONS OF THE ROLE * Design and verification of continuous-time and discrete-time circuits like amplifiers, filters, high accuracy and high performance data-converters in CMOS technology. * Working with layout team on layout of Analogue and Mixed-Signal blocks * Supporting post-silicon setting up and debugging to evaluate the Performance of the IC * Collaborate with cross-functional teams, including the RF IC Design team, the IC Validation team as well as the Quantum physics team to achieve the project goals. * Documenting own work and contribute in design reviews EXPERIENCE - ESSENTIALS * Solid understanding of Analogue and Mixed-Signal CMOS IC design  * Experience in design of Analogue integrated circuit with silicon-proven results * Familiar with design of Switched-Capacitor circuits and Data Converters in CMOS technology * Strong analytical and problem-solving skills with a high-level of self-management and self-motivation * Familiar with design and verification CAD tools. * Experience in Layout and design strategy EXPERIENCE - DESIRABLE * Experience in design of ADCs and DACs for high-frequency, high-performance or low-power applications.  * Experience in clock generation circuits and PLL * Knowledge of CMOS fabrication technology * Familiar with Cryogenic CMOS design  * knowledge of Verilog, Verilog-A  or Verilog-AMS * Knowledge of MATLAB * Knowledge of DSP and communication system BENEFITS * Be part of a creative, world-leading team * Competitive salary and share options scheme * Contributory pension scheme * Group private medical insurance scheme * Life Assurance * Cycle-to-work Scheme  * Central London location EEO STATEMENT Quantum Motion is committed to providing equal employment opportunity and does not discriminate based on age, sex, sexual orientation, gender identity, race, colour, religion, disability status, marital status, pregnancy, gender reassignment or any other protected characteristics covered by the Equality Act 2010

MEET ARAGO AND THE ARAGONIANS Arago is an AI and computer hardware company whose mission is to drive the course of history forward. We do so by accelerating breakthroughs at the intersection of AI and semiconductors. Founded in 2024 by AI researchers and physicists with deep expertise in photonics, electronics, software, mathematics, and machine learning, Arago brings together a lean team of engineers and scientists from the world’s top companies and research labs. Composed of nine nationalities and operating from hubs in France, North America, and Israel, we believe in great science and fast achievements. Our work is guided by these core principles: 1. Do great things: we deliver work we’re proud to sign our name to. 2. High velocity: speed matters. We move quickly, one step at a time. 3. One unit: we’re all in this together, with relationships grounded in trust, respect, and camaraderie. Arago is backed by executives from Apple, Arm, Nvidia, Microsoft, and Hugging Face, as well as prominent US and European deeptech venture firms and exited founders. WHAT YOU’LL DO Design high-performance analog and RF ICs optimized for precision, power, and area, driving Arago’s prototype and product iterations from architecture to silicon validation. RESPONSIBILITIES * Design and simulate analog and RF integrated circuits, including critical blocks such as amplifiers, mixers, PLLs, ADCs, DACs, and bias/reference circuits, with a focus on signal integrity, linearity, and precision. * Optimize circuits for power, area, and performance trade-offs, ensuring designs meet system-level requirements across process, voltage, and temperature (PVT) variations. * Collaborate closely with optics, simulation and PCB teams to define architecture and block-level specifications for Arago’s successive prototypes and product iterations, ensuring tight alignment with overall performance and integration goals. * Work with layout engineers to guide floor-planning and physical design, minimizing parasitic effects and preserving analog precision in layout-sensitive blocks. * Support post-silicon validation and bring-up, defining test plans, analyzing lab measurements, and correlating results with simulation to refine future design iterations. * Language: English at a proficient level. French is a plus. REQUIRED SKILLS AND EXPERIENCE * A sound mathematical understanding and deep physical intuition of analog electronics, as well as analog voltage-to-current and current-to-voltage conversion at low and high frequencies. * Experience in designing high-precision analog systems for signal processing or power electronics. Experience working with high-frequency analog signals is valued. * Extensive experience in IC design and post-layout design methodology using standard industry tools like Cadence Virtuoso. * Proficiency in designing and optimizing mixed-signal circuits, including DACs and ADCs at low (kHz-MHz) and high (>GHz) frequencies, and signal conditioning circuits, ensuring flawless integration between analog RF components and digital processors. * Strong understanding of signal integrity, crosstalk, and noise reduction techniques in mixed-signal environments, particularly in high-frequency RF systems interfacing with digital processors. * Advanced node experience required (<28nm). PAY AND BENEFITS * Competitive cash compensation, with final package based on location, experience, and the pay of team members in similar positions. * Meaningful stock option plan offered at the earliest stage of the company (included in the majority of full time offers). * Relocation bonus and coverage of moving expenses for relocation within 20 minutes of the company’s location. * Healthcare coverage (including family-friendly options), pension contributions, professional development support, and 25 days of PTO, in addition to public holidays. * Ownership of a key technical domain, with significant vertical and/or horizontal growth opportunities, based on performance and individual drive. * Reimbursement of 50% of the public transport subscription fee. * A high-paced, multicultural (with 9 nationalities), and engineering-led environment.