Web App Engineer (Japan Team)

We are seeking passionate and driven international engineers to join our Tokyo-based product team.

Sansan is Japan’s leading business card-based contact management solution for corporations, and one of Japan’s leading SaaS products. Sansan is driven by innovation, and wants to boost this dynamism further by bringing international software engineers into our product development department. We seek motivated engineers who understand user and business needs, and can contribute passionately to the development process.

As this role will be in one of the Japanese development teams (to be assigned based on compatibility and aptitude), business-level Japanese is required.

Residence in Tokyo is required for the role, but applications from abroad are welcome. We will fully support successful applicants’ relocation to Tokyo.

You’ll be working in our head office, which is in a great location in the trendy and upmarket Omotesando area of Tokyo.

Development Environment

  • Languages used: C# 7, JavaScript (jQuery, Bootstrap, etc.), LESS
  • Framework: .NET Framework 4.6.1 (ASP.NET MVC, ASP.NET Web Forms, ASP.NET Web API, WPF)
  • Database: PostgreSQL 9.6, Redis 3.2
  • Repository: GitHub
  • Project Management: Jira, Gantter
  • CI/Testing: Jenkins, NUnit
  • Infrastructure: AWS (EC2, S3, SQS, DynamoDB, SES, RDS, ElastiCache, etc.)
  • Operation/Monitoring: Zabbix, Grafana, New Relic, Amazon Elasticsearch Service, Fluentd, Chef

Required Languages

  • Business-level Japanese

Required Skills

  • At least 3 years experience with web development (preferably using C#.NET Framework, MVC, HTML/CSS/jQuery, RDBMS (PostgreSQL))
  • Able to design domain models, database schemas and system architecture (experience with AWS is also welcome)
  • Able to write clean, maintainable and tested code
  • Experience in teams, doing code-reviews, git-flow, and releasing your own code
  • A confident and forward-looking understanding of user expectations and needs
  • A positive and motivated attitude

Employment Details

Employment Type

Full-time (正社員)

Annual Salary

¥5,530,000 – ¥8,050,000


Sansan Head Office Aoyama Oval Building, 5-52-2 Jingumae, Shibuya-ku, Tokyo


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 30 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 with colleagues in different teams.

Geek Seek

Company pays for work-related books, hardware and software you request.
*Only for engineering and creative positions.


Company subsidized language lessons.


Company subsidizes 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.


This plan provides subsidies for various services that support staff with children up to the sixth grade of elementary school in balancing work and childrearing.

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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