Backend Engineer (DSOC)

We seek a knowledgeable and experienced software engineer to work in DSOC’s Nayose Group.

The Nayose Group is responsible for analysis and integration of Sansan’s digitized business card data and other contact data from various sources. Principally, it is responsible for recognizing which data corresponds to which individuals and companies, and effectively integrating them into our proprietary management system.

This process is essential to both of Sansan’s two main businesses; the B2B product Sansan, and the B2C product Eight. Sansan is Japan’s leading business card-based contact management solution for corporations with over 7000 corporate customers, while Eight has over 2.5 million individual users.

With Sansan’s global expansion underway, in order to further improve the efficiency and quality of integration of non-Japanese people and companies, we seek a non-Japanese engineer to join the Nayose Group. The role will involve UI and Web API development, as well as data handling and transactions, in close collaboration with DSOC’s R&D Team and Sansan’s Global Product Group.

We are driven by innovation, and are looking for a passionate and intelligent engineer who will demostrate initiative and ambition, devise new solutions and help drive the project ever forwards. We combine data, technology and operational acumen to generate unrivalled value and quality. We aim to be the best not only in Japan, but the world.

For more information on DSOC:

Development Environment

  • Language: Ruby 2.6
  • Famework: Ruby on Rails 5.2
  • Database: Aurora (MySQL)
  • Code review: Pull Request
  • Project management: GitHub
  • CI/Testing: CircleCI, RSpec
  • Infrastructure: AWS (incl. EC2, S3, Athena, Redshift, DynamoDB, Elasticsearch, ElastiCache, SQS, Lambda), GCP (BigQuery)
  • Monitoring platforms: Datadog, Opsgenie
  • Infrastructure management: Terraform
  • Deployment automation: Capistrano

Required Languages

  • Business-level Japanese
  • Business-level English

Required Skills

  • Over 5 years experience in developing web applications that use major MVC frameworks
  • Experience building and operating applications that use cloud services such as Azure, GCP and AWS

Preferred Skills

  • Experience developing and operating large-scale services
  • Experience analyzing large amounts of data, hypothesizing and problem-solving
  • Experience with architectural design
  • Successful project management experience
  • Team building experience in a growing team
  • Experience performance tuning with RDBMS

Employment Details

Employment Type

Full-time (正社員)

Annual Salary

¥6,706,000 – ¥11,522,000


Sansan ONE, One Omotesando 6F, 3-5-29 Kitaaoyama, Minato-ku, Tokyo, Japan


Flextime – 8 hours per day
Core working time is 10am – 4pm




Twice annually (January & July)

  • Japanese national health insurance
  • Transportation costs
  • 6 month probation period, with full pay and benefits
  • Salary includes 45 hours overtime pay (irrespective of whether any overtime is worked)
  • Any overtime beyond this will be paid additionally (though is discouraged)

Employee Empowerment

Here are some examples of the benefits which full-time employees can receive.
N.B. Most have monthly/annual limits per employee.

Know Me

Company subsidized eating/drinking out for colleagues in different teams.

Geek Seek

The company will pay for work-related books, hardware and software you request.
*Only for engineering, R&D, and creative positions.


Company subsidized language lessons.


Company subsidized rent for employees living within 2 train stops of Omotesando or Shibuya stations.


Working from home permitted up to 4 days per month.


Weekdays can be taken off in exchange for working on weekends/holidays.


Various benefits for new mothers, such as nursery fee subsidies.


Subsidies for parents of young children, covering babysitting and housekeeping fees.

Charge Leave

3 consecutive paid days off between July & October (not deduced from paid holiday allowance).

  • Weekends & national holidays
  • Annual paid holiday
  • New year holiday

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