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Seeking a few Research Scientist or Postdoctoral Researcher (R-CCS2205)


Supercomputing Performance Research Team
RIKEN Center for Computational Science
(Team Leader: Jens Domke)

Research field

RIKEN Center for Computational Science (R-CCS), led by Center Director Satoshi Matsuoka, is an international research center in high performance computing and computational science in Japan. Our objectives are to investigate “the Science of (high performance) computing, by computing, and for computing”, to research and develop our technologies (R-CCS technology) and software (R-CCS software), which we consider our core competence, in order to produce world-leading scientific and engineering results for use in Japan as well as globally.

Also, R-CCS started operating Japan’s national flagship supercomputer Fugaku, as a shared national facility to support a wide range of research activities since 2021.

The Supercomputing Performance Research Team conducts performance studies of traditional HPC architectures and software subsystems such as processors, networks, memory, accelerators, and storage; and the team investigates non-traditional hardware, such as neuromorphic chips, optical processors, and quantum computing devices to analyze their applicability to speed up supercomputing workloads. The team’s mission is to improve the performance, efficiency, and usability of Fugaku and upcoming supercomputers by data-driven co-design.

Job title and job descriptions

Job title

Research Scientist or Postdoctoral Researcher: A few positions

Job description

The scientist will join a vibrant team and top-class HPC institute to collaborate with other computer science and domain science teams to conduct research on HPC performance, such as performance modeling, simulation, prediction, and monitoring, in order to enhance the community’s understanding of cutting-edge and future supercomputers as well as applications running on these systems. Furthermore, the scientist will be in charge of benchmark design and preservation of existing benchmark suites to conduct short-term analysis of various systems and long-term tracking of performance trends.

The scientist will be able to research novel methods to automatically apply performance tuning and/or portability approaches to large-scale simulations running on Fugaku or other supercomputers, and will disseminate the research findings through scientific publications.

In addition to the above research and development, the scientist might take charge of various tasks in our research team and she/he could be involved in the R&D for the next generation of supercomputers for the RIKEN Center for Computational Science.


Applicants must have a doctoral degree or expect to receive a doctoral degree before the date of appointment. In general, those who earned a doctorate within the past 5 years will be appointed as Postdoctoral Researcher, and those who earned a doctorate more than 5 years ago will be appointed as Research Scientist.

Applicants should have:

  • Experience in performance analysis, tuning, or modelling of hard- or software system;
  • Knowledge of high performance computing systems; scalable, parallel architectures; and Linux operating system;
  • Knowledge of typical high-level programming languages and parallelization paradigms used in the HPC field, e.g., C, C++, Fortran, CUDA, OpenMP, and MPI;
  • Knowledge of one or more common scripting languages such a Bash, Python, etc.;
  • A high degree of self-motivation, a drive to learn new things, and a desire to solve complex “puzzles”; and
  • Confidence in communicating in English, i.e., reading, writing and speaking.

Work location

Branch and address

RIKEN Center for Computational Science
6-3-5, Minatojima-minamimachi, Chuo-ku, Kobe, 650-0047, JAPAN

RIKEN has implemented a work-from-home system. Employees can work from home in accordance with the prescribed procedures.

Salary and benefits

  • 1.(Research Scientist) One-year fixed-term employment contract, renewable based on evaluation, up to seven years since the initial date of hire.
  • 2.(Postdoctoral Researcher) One-year fixed-term employment contract, renewable based on evaluation, up to five years since the initial date of hire.
  • 3.RIKEN may adjust the above maximum period of renewability based on a) the employee’s abilities, work load at the time of contract completion, performance and work attitude and b) the continuation of the employee’s center, laboratory or project and RIKEN’s management situation and budget at the time. In principle, employment contracts will not be renewed for individuals older than 65 years.

In principle, the first two months of employment is considered a trial period.
Salary will be an annual salary based on experience, ability, and performance, and will consist of a base salary and a variable salary. The variable salary will be determined each fiscal year based on experience, ability, and performance. The monthly base salary is 290,200 JPY for Postdoctoral Researcher and 417,300 JPY for Research Scientist as of April 1, 2022. The monthly base salary and variable salary are subject to change due to amendments to RIKEN regulations.
Discretionary work, commuting and housing allowances will be provided. Social insurance will be applied.
The approximate amount of annual salary at the time of employment:
The monthly salary including discretionary work allowance at the time of employment will be more than 350,000 JPY for Postdoctoral Researcher and 500,000 JPY for Research Scientist.
Mandatory membership in the RIKEN Mutual Benefit Society (RIKEN Kyosaikai).
This position falls under the specialized duties discretionary work system; one working day will be calculated as 7 hours and 30 minutes.
Days off include public holidays, New Year's holidays (Dec. 29 - Jan 3), and RIKEN Foundation Day.
Paid leave includes annual paid leave (up to 20 days per year depending on the month of employment), special paid leave (childcare, family nursing care, etc.), and work-life balance holidays (up to 7 days per year depending on the month of employment).
There are also additional leave systems such as maternity leave, childcare leave, and family nursing care leave.
No smoking on site
These and other provisions are in accordance with RIKEN regulations.

RIKEN is actively undertaking initiatives to promote gender equality and diversity, and moving forward with the establishment of a diverse and vibrant research environment. If multiple candidates are found to have the same aptitude following a fair assessment, active efforts will be made to recruit female candidates.

Also, eligible for an exemption from repayment for category 1 scholarship loans provided by the Japan Student Services Organization before fiscal year 2003, and eligible applying for the MEXT Grants-in-Aid for Scientific Research (Kakenhi).

Application and required documents

Required documents

Please prepare the following documents in English.

  • 1.CV
    No format specified. Please make sure to include applicant’s name, date of birth, nationality, academic background, work history including the applicant’s current affiliation, and email address.
  • 2. List of research achievements
    Include not only peer-reviewed papers but also awards and competitive funds received, achievements in research while working in the private sectors. Also include quantitative evaluation indexes such as the Google Scholar citation index as much as possible.
  • 3. Copies of up to five most important publications (Please mark the papers on the list of publications.)
    When the original publications are not in PDF format, scan the papers and save them as PDF documents prior to submission.
  • 4. List of external funds acquired, awards received, and other achievements including, contributions to university/institution operations, contribution to society through activities in academic societies, joint research projects, technology transfers, etc.
  • 5.Description of previous research, future research plans, and career goals: No format specified, approximately three to four A4 pages in total. It is desirable that a diagram describing the research is provided.
  • 6. Recommendation letters in English from one or two persons who can evaluate your work
    • *One recommendation letter should be written by the applicant’s current supervisor. When it is difficult to do so, a recommendation letter written by a third party may be accepted.
    • *The letters should be addressed to RIKEN R-CCS Director. Digital signature image can be embedded in the recommendation letters within the PDF file. Or please specify the referee’s contact information (name, affiliation, job title, phone number, and email address) in the letter.
  • 7.

    Consent form for handling personal information based on GDPR
    If you are a resident of the European Economic Area (EEA), you are required to submit the document, "Consent form for handling personal information based on GDPR" with your signature.

    *You will find detailed information about General Data Protection Regulation (GDPR) on the following website:
    Data protection | European Commission

How to apply

Combine the above documents into a single PDF file and upload them to the following website:
Applications for R-CCS Supercomputing Performance Research Team

The file name of the PDF should contain the job ad number “R-CCS2205, Supercomputing Performance Research Team” and the applicant’s name. Please write the name of the position that you apply for in the “Add additional information” box.
After you uploaded the PDF file, please let us (kobe-jobs [at] riken.jp) know the file name of the uploaded file. When you send us an email, please write your name, Job Ad number and the name of the position that you apply for.
If the recommendation letter is directly submitted from the referees, please send it to (kobe-jobs [at] riken.jp) by attaching it to the email. Please write "R-CCS2205 Supercomputing Performance Research Team, [name of the position], [applicant’s name] (Recommendation letter)” in the subject line and specify the applicant's name, referee's name and contact information in the email.

If a confirmation email is not received within 7 days after submission, please contact: kobe-jobs [at] riken.jp.

Note: Submitted documents will not be returned.


Applications will be accepted until the positions are filled.

Handling Personal Data

Submitted documents are strictly protected under the RIKEN Privacy Policy and will be used only for the purpose of applicant screening. Personal information will not be disclosed, transferred or loaned to a third party under any circumstances without just cause.

Selection process

Applications will be reviewed upon receipt, and interviews will be conducted for selected applicants (2 interviews for Research Scientist position and one interview for Postdoctoral Researcher position.) No inquiries on the selection process and results will be answered.

Start of employment

At the earliest opportunity (subject to negotiation)

Contact Information

For inquiries on research conducted by the team, please contact the Team Leader by email:
Jens Domke
Supercomputing Performance Research Team
RIKEN Center for Computational Science
Email: jens.domke [at] riken.jp


  • Updated as of Nov. 3, 2022: "Salary and benefits"
  • Updated as of May. 22, 2023: "Work location" and "Salary and benefits"