Senior Software Engineer

We’re looking for a Senior Software Engineer to help us accomplish our mission to improve and extend lives by learning from the experience of every person with cancer. Are you ready to be the next changemaker in cancer care?

Flatiron Health is a healthtech company using data for good to power smarter care for every person with cancer, around the world. Flatiron partners with cancer centers in the US, Europe and Asia to transform patients’ real-life experiences into real-world evidence and create a more modern, connected oncology ecosystem. Our multidisciplinary teams include oncologists, data scientists, software engineers, epidemiologists, product experts and more. Flatiron Health is an independent affiliate of the Roche Group.

What You'll Do

In this role, you will design, develop, and deploy robust software solutions to securely access, transfer, and transform raw patient data into high-quality, ready-to-use real-world evidence and data products. You will collaborate with Flatiron colleagues globally and work day-to-day with oncologists, clinicians, product leaders, quantitative scientists, and customers to understand their challenges and build technological solutions. In addition, you will:

• Drive key technical objectives within the team's roadmap and lead architectural decisions for your areas of scope, ensuring alignment with global Flatiron engineering standards.
• Lead the architecture, design, and development of data extraction and web applications that meet the needs of a rapidly changing business
• Devise creative solutions to solve tough business, security, and data privacy challenges
• Lead the hands-on deployment of solutions at hospital partner premises, directly navigating and troubleshooting complex local infrastructure, network configurations, and technical constraints.
• Mentor and guide other engineers, fostering a culture of technical excellence and continuous learning.

Who You Are

You're a kind, passionate and collaborative problem-solver who values the opportunity to think beyond the way things are. In addition:

• You have 5+ years of experience with software development using programming languages, such as C#, Java or Python
• You have 5+ years of experience with web technologies (such as HTML, CSS and JavaScript) and backend frameworks (such as ASP.NET Core and Spring MVC)
• You have 3+ years of experience with relational database systems, such as PostgreSQL and MySQL
• You have 3+ years of experience with Linux system administration
• You have experience working with infrastructure as code (IaC)
• You have deep expertise in system architecture, data modeling, and designing secure APIs.
• You have business-level proficiency in English
• You have native or advanced business-level Japanese proficiency, with the polished communication skills and professional etiquette required to lead technical discussions, align on requirements, and build trust directly with physicians, hospital executives, and vendor partners
• You have a strong understanding of networking fundamentals (TCP/IP, DNS, routing, firewalls, and proxy configurations) and experience troubleshooting connectivity issues in highly secure or restricted enterprise environments
• You are willing to travel to hospital partner premises to perform server operations when needed.

Extra Credit

• You have experience with developing or operating EHR systems or department systems
• You have experience with managing server hardware
• You have experience with development on AWS

Who We Are

Our people are at the center of everything we do. We strive to foster a culture where our teammates feel equipped and empowered to make meaningful contributions with confidence, compassion, and clarity.

Statutory Benefits

• Employment Term: Full time (indefinite)
• Probationary Period: 6 months
• Work Location: Tokyo, Japan
• Work Hours: The normal work hours are 9:00 - 18:00. This role is eligible for the flex-time system.
• Holidays: Saturday, Sunday and public holidays
• Social Insurance: Health, Pension, Employment and Workers' Accident
• Smoking: No smoking allowed in the office, smoking area is in the building