Product Engineer – Mid-Level

**About the company:** Starley Minato-ku, Tokyo At Starley, we’re developing "Cotomo," a leading voice-based AI conversation platform. Our goal is to redefine how humans interact with AI. Read more **Responsibilities:** Design and implement efficient, highly available infrastructure to support high traffic Build backend systems that integrate various AI models, including speech recognition, natural language processing, and speech synthesis Develop streaming systems to deliver high-quality, real-time voice communication Construct and optimize scalable frameworks for large-scale data processing Collaborate with product managers and designers to participate in product improvement and feature planning Requirements At least 3 years of experience in designing, implementing, and maintaining backend systems Proficiency with relational databases (e.g., PostgreSQL, MySQL) and NoSQL databases Basic understanding of real-time communication technologies (e.g.,WebRTC, WebSocket) Experience working with cloud platforms (e.g., AWS, GCP, Azure) Experience in building or improving CI/CD pipelines (personal project experience is acceptable) Practical experience in integrating new tools and technologies (e.g., RAG, Cursor, Devin) or equivalent hands-on experience Fluency in Japanese for daily communication Nice to haves While not specifically required, tell us if you have any of the following. Experience working in an early-stage startup environment Technical communication skills in English Exposure to machine learning model operations Experience with home server setup and management Basic familiarity with deep learning models (e.g., LLMs) and fine-tuning techniques Familiarity with speech recognition or natural language processing is a plus Compensation ¥7,500,000 ~ annually. With performance-based stock options. **Requirements:** At least 3 years of experience in designing, implementing, and maintaining backend systems Proficiency with relational databases (e.g., PostgreSQL, MySQL) and NoSQL databases Basic understanding of real-time communication technologies (e.g.,WebRTC, WebSocket) Experience working with cloud platforms (e.g., AWS, GCP, Azure) Experience in building or improving CI/CD pipelines (personal project experience is acceptable) Practical experience in integrating new tools and technologies (e.g., RAG, Cursor, Devin) or equivalent hands-on experience Fluency in Japanese for daily communication **Nice to have:** While not specifically required, tell us if you have any of the following. Experience working in an early-stage startup environment Technical communication skills in English Exposure to machine learning model operations Experience with home server setup and management Basic familiarity with deep learning models (e.g., LLMs) and fine-tuning techniques Familiarity with speech recognition or natural language processing is a plus **Compensation:** ¥7,500,000 ~ annually. With performance-based stock options.