[professional haken] frontend lead (js/ts) | openai partner project.

■Location: Tokyo■Overview:Randstad, partnered with a leading global telecom company. In 2025, they launched an exclusive partnership with OpenAI to build Japan’s first enterprise-grade generative AI platform. They aim to create a system enabling artificial intelligence to develop another, more efficient AI model. That's through using AI agents which can perform tasks without human input. Now in its fast-moving, startup-style launch phase—with plans to spin off into a standalone entity—this project offers a rare, hands-on opportunity to shape cutting-edge AI infrastructure in direct collaboration with OpenAI. An experience you won’t find anywhere else in Japan.■Responsibilities:Build responsive, real-time web interfaces using modern JavaScript/TypeScript frameworks like React (Next.js/Remix) or Vue.js.Implement intuitive UIs that allow end users to interact seamlessly with generative AI models.Design and implement frontend logic to call OpenAI or other LLM APIs, including handling streaming data (e.g., using Server-Sent Events or WebSockets).Build robust error handling and retry mechanisms to ensure stable product interactions.Possibly contribute to prompt engineering or UI flows that optimize how users instruct and receive feedback from the product.

求められる経験
■Requirements
Team-based software development experience
3+ years of experience in Web application development (JavaScript / TypeScript)
Practical experience with one or more frontend frameworks: React (Next.js / Remix) or Vue.js
Integration of generative AI APIs into the UI layer, including SSE streaming and error retry mechanisms

保険
健康保険　厚生年金保険　雇用保険

休日休暇
土曜日　日曜日　祝日

給与
年収580 ～ 900万円

賞与
0
雇用期間
期間の定めなし