Senior Software Engineer

■仕事概要
As a Senior Full Stack Engineer, you will own product development across the stack, from backend systems to frontend experiences. You will work closely with AI engineers and clinicians to deliver features used in real clinical settings. This role is ideal for someone who enjoys strong ownership, fast iteration, and building systems that directly improve healthcare operations.
Responsibilities
Own end-to-end product features from backend APIs to frontend UI
Design, build, and scale core application architecture and database infrastructure
Develop and maintain systems using Postgres, AWS RDS Aurora, and cloud-native services
Integrate real-time AI services such as speech recognition, summarization, and NLU through AWS and Azure
Deploy, optimize, and maintain cloud infrastructure on AWS
Collaborate closely with AI engineers, product members, and clinicians to ship impactful features
Improve system reliability, performance, and developer productivity
Perform additional engineering responsibilities as needed in a fast-moving startup environment
Senior level
Hiring Process
Document screening
1–2 interviews (Including a technical interview.)
Final decision

3+ years of full-stack software engineering experience
Strong backend development skills with technologies such as Nextjs, Django, FastAPI, Node.js, AWS Lambda, Postgres, and SQL
Solid frontend development experience
Strong product mindset with the ability to think across the full system
Comfortable working in a global team
Based in Japan, with the ability to commute to Tokyo
Business English
※No Japanese language skills required

Experience with AWS or Azure AI services
Experience with Infrastructure as Code (IaC)
Experience in healthcare, medtech, or other regulated industries
Can speak both Japanese and English fluently