This position is closed and is no longer accepting applications.

Senior Frontend Engineer - Realtime and Personalization

Treasure Data Minato-ku, Tokyo March 9 2026
  • 💴 No salary range given
  • 🏡
    Partially remote
  • 🗾 Japan residents only
  • 💬
    No Japanese required
    Business English
  • 🧪
    Senior level
    5+ years experience required

About Treasure Data

Treasure Data Minato-ku, Tokyo

Treasure Data is the only enterprise Customer Data Platform that harmonizes an organization’s data, insights, and engagement technology stacks to drive relevant, real-time customer experiences throughout the entire customer journey.

Key benefits

  • Highly Technical Founders
  • Globally distributed company
  • Open Source is in our DNA

About the position

At Treasure Data, we are not just maintaining a platform; we are actively reinventing how marketers interact with data. We are looking for a Senior Frontend Engineer to drive user interface development of our newest strategic initiative: a cutting-edge AI Agent for marketers.

In this role, you will be the frontend expert within a cross-functional squad. While the backend handles complex models, your challenge is to make those models accessible, responsive, and intuitive for the user. You will design the architecture for how our application manages state, handles complex data, and enables new ways of interacting with agents.

You will work out of our local office three days a week, collaborating directly with product managers and designers to ship features that have a tangible impact on our customers’ ability to generate value from their data.

Responsibilities

  • Translate designs into React applications. You will tackle challenges specific to AI interactions.
  • Partner closely with backend engineers to define API contracts. You will advocate for frontend needs to ensure efficient data fetching and rendering.
  • Assist with system design activities, bringing an experienced perspective to discussions to make the right tradeoffs.
  • Build with a mind towards scalability, performance and operationalization.
  • Keep a pulse on the evolving React and frontend landscape, advising the team on new tools or patterns that increase developer velocity or user satisfaction.

Requirements

  • 5+ years of software engineering experience , with a strong focus on building complex Single Page Applications (SPAs).

  • You have mastery over React, TypeScript, and the modern JS ecosystem. You understand the Virtual DOM, React hooks, and performance tuning deep down.

  • Proficient with modern state management libraries (e.g., Redux Toolkit, React Query/TanStack, or Context API).

  • While you focus on the frontend, you understand HTTP, REST, and GraphQL, and can effectively debug across the network layer.

  • You thrive in agile environments. You are a driver—you identify blockers and remove them.

  • Business-level English proficiency is required. You can effectively communicate complex technical concepts to non-technical stakeholders.

  • Must be able to work in the office 3 times a week.

Nice to haves

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

  • Experience building Chat Interfaces or integrating LLM/Generative AI features (handling streaming tokens, markdown rendering, etc.).

  • Experience working in global teams, coordinating with engineers in different time zones.

Meet Treasure Data's Developers

David discusses how he enjoys switching hats between ML and software, and why he finds Treasure Data’s “extensive ecosystem” so much fun.

Read their story...

Carlo, a Staff Software Engineer, shares how Treasure Data’s latest AI initiatives are opening up unprecedented opportunities for both the company, and his career.

Read their story...

Tyler is a software engineer at Treasure Data working on their Data Clean Room product. He talks about how Treasure Data supports their team’s learning and growth, and how they invest in the quality and performance of their services.

Read their story...

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