Software Engineer, Full Stack (LLM/GenAI) - Mercari
Mercari, inc., Japan

"What can I do to help society thrive with the finite resources we have?" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential.For more information about Mercari Group’s mission, see Mercari's Culture Doc.

Here at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value. We also firmly believe that a mindset of Diversity amp; Inclusion is essential for us to achieve our mission.

This, of course, extends to our hiring practices as well. Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background. For more details, please read our Damp;I Statement.

The Generative AI/LLM Team’s mission:

To maximize the impact of Mercari’s business and dramatically enhance productivity across the company through the application of generative AI/LLM technologies in our products

(Learn more about Mercari's mission and values here.)

Specific work responsibilities include the following:

• Implementation of product and new development for various services within the Mercari Group using AI/LLM technology.
• Creating tools to enhance productivity across Mercari Group’s companies and the teams within
• Selecting technologies for generative AI/LLM services and designing architecture for applications
• Staying up-to-date with the latest generative AI/LLM technologies and making external presentations

• In this position, you will be able to leverage Mercari Group’s vast amounts of information to create products used by a large number of people.
• You will have opportunities to design and implement applications of cutting-edge generative AI/LLM technologies for services used by tens of millions of people.

• Shared belief in the mission and values of Mercari Group and its various companies
• Two or more years of experience in at least three of the following:
  • Backend: API development using a programming language such as Go or Java
  • Frontend: Development using such things as web browser markup languages, TypeScript, React.js, Next.js, or Redux
  • Mobile: iOS development using Swift or Android development using Kotlin
  • Data Platform: Development using distributed processing frameworks such as Dataflow, Spark, Kafka, or Flink, as well as knowledge of data schemas and file formats used in Avro and Protocol Buffers (Parquet, ORC, etc.)
• Ability to proactively drive the project along while appropriately communicating with the rest of the team
• Passion for the products and technologies

• Experience developing generative AI/LLM-related products
• Experience writing machine learning-related research papers and presenting them at conferences with peer reviews
• Experience working in English
• Knowledge of machine learning kept up-to-date by reading research papers on a daily basis

• Has leadership ability, flexibility, and time management skills
• Proactively learns new technologies and puts them into practice
• Thinks about what’s best for the product and how they can provide the most value through technology
• Sees diverse changes as opportunities for constant improvement and development
• Is able to consistently come up with ideas for improvement and act upon them

(See this page for details.)

• Either of the following is required:
• English: Independent (CEFR - B2)
• Japanese: Independent (CEFR - B2)
  *Check here for more information about CEFR.

Full-time

• Probationary period: First 3 months after joining the company. (During this period your contract conditions will be the same as that of a permanent employee.)

Roppongi

• Smoking is prohibited within our offices
• Mercari has introduced a work style policy called Your C

Job Rewards and Benefits