This position is closed and is no longer accepting applications.

Software Engineer, Full Stack (LLM/AI)

Mercari Minato-ku, Tokyo
  • 💴 No salary range given
  • 🏡 Fully remote
  • 🧪 2+ years experience required
  • 💬 No Japanese required
  • 🌏 Apply from abroad
  • 🧳 Relocate to Japan

About Mercari

Mercari Minato-ku, Tokyo

Mercari is a marketplace app that makes it easy for people to safely sell and ship their things. Having been downloaded over 100 million times, it is now among the largest peer-to-peer selling platforms globally.

Key benefits

  • Full flextime
  • Outside work encouraged
  • Employee stock ownership program

About the position

The Generative AI/LLM Team’s mission is 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


  • Developing the application of generative AI/LLM technologies in Mercari Group’s services
  • 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

Nice to haves

While not specifically required, tell us if you have any of the following.

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

Meet Mercari's Developers

Jieqiong shares her experience of joining Mercari and working as a tech lead. She explains their engineering culture and provides tips for potential applicants.

Read her story...

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