Full Stack Engineer (Future Tech Lead Path)

  • Tokyo
  • Partial Remote
  • Full-time
  • June 5, 2025
Conditions
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¥5M ~ ¥9M /yr
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Apply from Anywhere 👍
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Relocation to Japan 👍
(Overseas visa sponsorship supported)
Requirements
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Language Requirements
Japanese: Business Level
English: Not Required
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Minimum Experience
Junior or above

We’re Hiring: Full Stack Engineer (Future Tech Lead Path)

Location: Tokyo, Japan

Language Requirement: You're Japanese doesn't have to be perfect, but you should be able to do non-technical interviews in Japanese. For reference High JLPT N3/N2. (Certificate not required)

We’re looking for a Full Stack Engineer who wants to build great products, grow into a leadership role, and help shape the future of our platform, our engineering team/culture, and our company.

We welcome developers with experience in any language—Java, Go, Python, PHP, etc. As long as you’re excited to work in our stack (Next.js/TypeScript and Rails/Vue.js) and willing to learn, you’re a fit.

 

We’re hiring for multiple positions!

What You’ll Work On

  • Our product, KATIX, is currently focused on helping people sell bikes and cars, but we’re actively working to expand into new verticals.
  • The bike platform is built with Ruby on Rails, Vue.js, and Node.js
  • The car platform uses Next.js and TypeScript
  • Both systems are containerized with Docker and deployed to AWS. As a full stack engineer, you’ll join one of these teams and help us scale.

 

What You’ll Do

  • Build web frontends using Vue.js or Next.js
  • Build backend APIs using Ruby on Rails or Node.js
  • Support DevOps (CI/CD with GitHub Actions, ECS, ECR, Load Balancers, Monitoring, etc.)

 

What We’re Looking For

Minimum:

  • 2+ years of full stack web development experience (any language)
  • Able to interview in Japanese
  • You’ll either work in English or Japanese depending on your level, but passing the interview in Japanese is required
  • Experience working in a team based environment for more than 1 year (3+ members)

 

Bonus Points:

  • 5+ years of professional experience
  • Experience with Rails, TypeScript, Next.js, or Vue.js
  • JLPT N1 or native-level fluency
  • Experience as a Tech Lead
  • Experience working in Scrum teams

 

Why Apply?

  • You’ll ship real features from day one
  • You’ll have the opportunity to grow into a leadership role
  • We have a modern stack, a product-driven culture, and a young engineering team where your voice matters
  • We’re actively growing both the engineering team (2X) and the company (3X) and expanding to new markets

 

Ready to Apply?

No need for a perfect resume or cover letter. If you’re curious, passionate about product development, and ready to grow—just apply. We’d love to hear from you.

p.s. I will personally handhold every qualified individual through our interview process. My assumption is eveyrone who applies will have a decent amount of skill as a software engineer. So because we're looking for 'potential tech leads', what you'll effectively be measured against then is how well you can communicate with others. 

INTERFIRM believes that “Even valuable items can be safely sold online”. They developed KATIX, an online-complete selling service that connects "individuals who want to let go" with "stores that buy".

Users can simply take a photo of the item and enter the item details, and they’ll receive an offer amount the next day. Selling is easily completed with just a smartphone. This is a new service that has never existed before.

View INTERFIRM's company page

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Full Stack Engineer (Future Tech Lead Path) at INTERFIRM
APPLY NOW  ➜Japanese Required ⚠️