Rakuten Institute of Technology is seeking a research scientist to develop optimization methods and data-driven technologies for fintech services. The role is likely to involve research in mathematical optimization, machine learning, algorithms, statistics, or related fields, followed by practical implementation and evaluation. Candidates should have a PhD or equivalent research experience in computer science, operations research, mathematics, engineering, or a similar discipline. Strong programming skills, particularly in Python, C++, or related languages, are expected, along with the ability to publish research and communicate technical findings in English. Experience applying optimization or machine learning to financial, marketplace, or large-scale business problems would be valuable. The successful candidate will be expected to work independently, collaborate across international teams, and turn advanced research into usable products.
Rakuten is a major Japanese technology and internet services company founded in 1997 and headquartered in Tokyo. Its businesses cover online retail, travel, digital content, fintech, credit cards, banking, securities, mobile communications, and advertising. The company operates a broad ecosystem in which customers can use Rakuten services and earn and spend Rakuten Points. Rakuten Institute of Technology supports the group through research in areas such as artificial intelligence, machine learning, optimization, natural language processing, computer vision, robotics, and data science. Its researchers work with business divisions and international teams to apply advanced technology to real-world challenges. Rakuten is known for its global workforce, English-friendly corporate environment, and emphasis on innovation, though Japanese-language ability can be useful in some teams and daily life.
Japan offers opportunities in technology, fintech, engineering, data science, research, manufacturing, healthcare, tourism, and education. Tokyo has the largest international job market, while Osaka, Kyoto, Nagoya, Fukuoka, and Sapporo also provide strong career options. Japanese workplaces value reliability, teamwork, respect, and attention to detail; communication may be formal and consensus-driven. Life is generally safe and convenient, with excellent public transport, varied food, healthcare, and efficient public services. Housing and commuting costs are highest in Tokyo. Common work visas include the Engineer/Specialist in Humanities/International Services visa and the Highly Skilled Professional visa. Employers often sponsor applications, but qualifications, contracts, and immigration documentation are required. New arrivals should arrange housing, residence registration, health insurance, tax procedures, and a local bank account. Learning basic Japanese makes administration and social integration easier, even in international companies.
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