Mobile App Engineer

Applications: candidates may apply from outside Japan. Visa sponsorship: available. Japanese: Business level. English: Not required. Japan Dev tags: Engineering, Mobile - Other, Flutter, Mobile, Kotlin, Github, Swift, Firebase, Figma.

What You’ll Do

As a Mobile app engineer, you’ll play a key role in leading the development and improvement of SAMANSA’s platform.
You’ll work closely with our cross-functional team to design, build, and optimize features that enhance the user experience and accelerate our product growth.

Responsibilities:

• Lead the design, development, and operation of our short film streaming platform
• Build and maintain features of mobile app
• Analyze user data to identify opportunities and implement product improvements
• Contribute to technical strategy and participate in key engineering decisions
• Mentor and support other engineers while improving development processes
• Drive continuous delivery and rapid iteration through efficient feedback cycles

Our Tech Stack

• Backend: Ruby on Rails
• Frontend: React (Next.js) / HTML / CSS
• Mobile: Flutter
• Infrastructure: AWS (GCP experience is a plus)
• Data Analysis: BigQuery, statistical analysis tools
• Version Control: GitHub
• Tools: Slack / Notion /Datadog

Team Structure (as of May 2026)

• Fullstuck: 2 engineers (Also handle infrastructure)
• Backend: 3 engineers (1 also handle infrastructure)
• Frontend: 1 engineer (1 part time member)
• Mobile: 4 engineers (3 part time members)
• Others: 1 Product Manager, 1 QA tester, 1 UI/UX Designer

You’ll be joining a young, collaborative, and ambitious team that values both technical excellence and creative freedom.

Who We’re Looking For

We’re seeking an engineer who doesn’t just “build what’s requested,” but takes initiative — someone who’s excited to propose improvements, explore new technologies, and contribute strategically to our product’s evolution.
If you’re passionate about both technology and cinema, this is a unique opportunity to make an impact on how films reach the world.

Why SAMANSA

• Work on a product loved by thousands of film enthusiasts
• Collaborate with a diverse and creative team
• Have a strong voice in shaping our technology and roadmap
• Be part of a fast-growing startup aiming for global reach