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HPC Interconnect Specialist
Your Role and Responsibilities:We are looking for an HPC Interconnect Specialist to join our HPC Systems Operation group. You'll be responsible for the day-to-day operation, maintenance, and optimization of the high-speed interconnects underpinning our HPC clusters — ensuring the lowest possible latency and highest throughput for MPI workloads, distributed storage, and large-scale parallel applications. These HPC clusters comprise the national supercomputer at LRZ as well as additional state-wide HPC clusters of various size.
• Deploy, configure, and manage network switches, fabric management software, and host-software stacks.
• Monitor fabric health, diagnose link errors, and resolve performance bottlenecks.
• Run benchmarks and characterize the interconnect performance.
• Tune network performance for MPI, distributed file systems, and storage traffic.
• Collaborate with HPC system administrators, storage engineers, and application teams to optimize end-to-end data paths.
• Evaluate and recommend new interconnect hardware and technologies.
• Hunt and fix bugs, often in collaboration with vendor companies.
• Maintain detailed network topology documentation.

Basic Qualifications:
• University degree (master or above) in computer science, mathematics, or natural sciences
• At least three years of experience in high-performance computing
• Deep hands-on expertise with various HPC interconnects
• Experience with various flavors of the Message-Passing Interface
• Understanding of MPI communication patterns and how they interact with the network layer
• Solid Linux administration skills
• Proficiency with compiled programming languages (e.g. C, C++)
• Proficiency in scripting and automation (e.g. Shell, Python)
• Analytical mindset with a structured approach to fault isolation and performance tuning
• Excellent German and English in writing and speaking

Preferred Qualifications:
• Familiarity with GPU-to-GPU communication
• Knowledge of parallel file system networking
• Strong troubleshooting skills
• Ability to develop and implement practical solutions autonomously as well as in a team
• Service-oriented attitude

Conditions: Area High-Performance Computing Working time full time (40 hrs)flexible working model with electronic time recording Term of the contract 24 months, a further employment is intended Remuneration up to E 13, see Entgelttabelle TV-L Annual leave / compensatory time off 30 days (24.12. + 31.12. additionally day off)Overtime is compensated by additional time off Further trainings Individual support for in-service training and further education Mobile work up to 60% of work time, when applicable Benefits e.g. JobBike Bayern, bus and subway (U6) on the doorstep, free parking, pension plan of the Versorgungsanstalt des Bundes und der Länder (VBL), state-of-the-art work equipment, Cooperation Agreement with Sports Facility Providers for Discounted Membership
What can you find with us?Are you looking for a multifaceted and intellectually stimulating position in a dynamic, cooperative and innovative work environment? Then LRZ is the place to be for you! Here at LRZ a collegial, appreciative work environment meets an international crowd of experts who work together to advance IT services for ground-breaking research. We offer flexible work schemes for an optimal work-life balance. Our staff values their creative leeway. As an institute of the Bavarian Academy of Science and Humanities we offer all the benefits of public service. And of course, no wishes remain unfulfilled at the LRZ in terms of technical equipment. We share experiences, constantly review and improve our processes, and are proud that our service-quality and data-security are regularly certified and rated highly. We actively promote diversity and welcome applications from talented individuals, regardless of cultural background, nationality, ethnicity, gender and sexual identity, physical abilities, religion and age. We give priority to applications from people with disabilities who are equally qualified (SGB IX).

Further information:We are looking forward to receiving your complete application documents (including cover letter, CV and certificates) in a PDF file (other file types are not accepted) by latest 22.07.2026. Subject: HPC Specialist (2026/ 30 ) Are you unsure whether the job suits you or you suit us? Or do you still have questions about this position? Our colleagues will be happy to answer all your questions.
This job does not fit? Then take a look at https://www.lrz.de/en/careers/current-vacancies or send us an unsolicited application!

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About usSince 1962, Bavarian universities and research institutions have relied on the IT expertise of the Leibniz Supercomputing Centre of the Bavarian Academy of Sciences and Humanities. When it comes to the digital transformation of science, we are traditionally ahead of the game.