Senior Superconducting Circuit Design Engineer

Qilimanjaro Quantum Tech is seeking a Senior Superconducting Circuit Design Engineer to strengthen our hardware R&D activities in analog quantum computing. This role focuses on the analysis, modeling, and design of superconducting quantum circuits based on circuit quantum electrodynamics (cQED), with particular emphasis on fluxonium-based architectures.

We are open to two complementary senior profiles:

(i) a purely theoretical cQED expert, focused on modeling and understanding superconducting circuits for quantum computing applications, and

(ii) a hybrid profile combining strong theoretical knowledge with experience in numerical simulation of physical circuits.

The exact scope of responsibilities will be adapted to the candidate’s expertise and background.

🫡Key Responsibilities:

Depending on the candidate’s profile, responsibilities may include a subset of the following:

• Develop theoretical models of superconducting quantum circuits within the cQED framework.

• Analyze static and dynamical properties of fluxonium-based and related superconducting circuits.

• Perform analytical and/or numerical simulations to extract relevant circuit parameters and predict device behavior.

• Contribute to the design and optimization of superconducting circuits for quantum computing applications.

• Collaborate closely with measurement, fabrication, and integration teams to ensure consistency between theoretical models and experimental implementations.

• Participate in technical discussions and contribute to internal documentation supporting long-term hardware R&D strategies.

• PhD in Physics, Electrical Engineering, or a closely related field, with a strong focus on superconducting quantum circuits or circuit QED.

• Solid theoretical understanding of superconducting qubits and their electromagnetic environments.

• Proven ability to work at the interface between theory and experimental constraints.

• Strong analytical skills and scientific rigor.

• Excellent communication and documentation skills.

🤹Preferred Skills:

• Strong experience calibrating and measuring multi-qubit transmon-based quantum processors.

• Experience measuring fluxonium-based superconducting circuits.

• Experience with tunable couplers.

• Familiarity with calibration workflows for digital quantum architectures.

• Proficiency in Python or similar programming languages for experiment control and data analysis.

• Experience with designing and/or fabricating superconducting devices.

• Ability to contribute to mentoring, knowledge transfer, and healthy team dynamics.

💻Additional Information:

The main working location is Barcelona. The role requires a significant onsite presence, with some flexibility for remote work during the week.

Please mention your availability dates and whether you require an EU work permit in your application.

Why don’t you join us? 🥇We offer:

• A unique opportunity to work on real superconducting quantum hardware

• Strong mentorship and technical growth

• Hands-on lab + design experience in Barcelona

• Competitive salary

• Clear development path toward Quantum Hardware CAD Engineer

Benefits:🏥 Private health insurance

💳 Cobee flexible compensation (transportation, meals, and childcare support)

⏰ Flexible working hours

🏡 Hybrid work model

❤️Diversity and inclusion:

At Qilimanjaro, inclusion and equal opportunities are part of our people-centric value. We are committed to creating a workplace where everyone feels valued and empowered to contribute, learn, and belong.

GDPR (General Data Protection Regulation):

DATA CONTROLLER: QILIMANJARO QUANTUM TECH S.L., B67429670, Carrer de Veneçuela, 74, 08019 Barcelona (BARCELONA), Data Protection Officer: qilimanjaro@delegado- datos.com.PURPOSES: Participation in recruitment processes and reference verification.LEGAL BASIS: Implementation of pre-contractual measures.DISCLOSURES: None are an ticipated.DATA RETENTION: For the duration of the selection process.RIGHTS: You may exercise your rights of access, rectification, erasure, restriction, and data portability with the data controller. In case of any disputes, you may contact the AEPD (www.aepd.es).