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

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Backend: Ruby on Rails

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Frontend: React (Next.js) / HTML / CSS

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Mobile: Flutter

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Infrastructure: AWS (GCP experience is a plus)

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Data Analysis: BigQuery, statistical analysis tools

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Version Control: GitHub

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Tools: Slack / Notion /Datadog

Team Structure (as of May 2026)

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Fullstuck: 2 engineers (Also handle infrastructure)

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Backend: 3 engineers (1 also handle infrastructure)

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Frontend: 1 engineer (1 part time member)

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Mobile: 4 engineers (3 part time members)

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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