Senior Frontend Engineer - Realtime and Personalization

**About the company:** 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. **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. APPLY FOR THIS POSITION DO YOU NEED MORE INFO? ASK A QUESTION Meet Treasure Data's Developers Scaling ML Algorithms for Enterprise with David Landup 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... Overcoming Imposter Syndrome at Treasure Data with Tyler Welsh 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... **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 have:** 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. APPLY FOR THIS POSITION DO YOU NEED MORE INFO? ASK A QUESTION Meet Treasure Data's Developers Scaling ML Algorithms for Enterprise with David Landup 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... Overcoming Imposter Syndrome at Treasure Data with Tyler Welsh 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...