Full Stack Engineer

We’re looking for a full stack engineer to join our growing product team at KATIX. You’ll work on a modern TypeScript/Next.js monolith used by thousands of users every day, contribute across the stack, and grow into a tech lead role over time.

We welcome engineers from any language background such as Java, Python, Go, or PHP. If you’re excited about working with Next.js and TypeScript, and care deeply about building great products, we want to hear from you.

Most importantly, we are not looking for someone who just wants to change jobs. We are looking for someone who has looked into KATIX, understands what we’re building, and genuinely wants to be part of it. If you like the product, believe in what we’re doing, and want to grow with us, you’ll be a great fit.

 

What You’ll Work On

Our main product is a vehicle sales platform built as a large TypeScript/Next.js monolith. It includes features like auctions, escrow, AI integrations, user onboarding, and internal tools.

As a full stack engineer, you’ll work within this codebase, primarily using Next.js (App Router) and TypeScript. You’ll contribute to a wide range of areas based on team needs — from buyer flows and admin tools to operations dashboards and landing pages.

While engineers specialize later in their career, this role is designed for someone who can flex across the stack and collaborate with product, design, and other engineers. Over time, we expect engineers to develop expertise in areas like DevOps, SRE, or technical architecture.

 

Responsibilities

• Build and maintain frontend features using Next.js and TypeScript
• Develop backend logic using API routes, server actions, and shared packages
• Contribute to system design, database schema updates, and feature planning
• Write and review code for clarity, simplicity, and maintainability
• Support deployments using AWS, Docker, ECS, and GitHub Actions
• Participate in team planning, standups, and retrospectives
• Troubleshoot bugs and maintain reliability of tests and CI pipelines

 

What We’re Looking For

Minimum

• 2 or more years of professional full stack web development experience
• Comfortable communicating in Japanese (conversational level or higher)
• Experience working in an engineering team with 3 or more developers

 

Bonus

• 5 or more years of professional experience
• Experience with Next.js, TypeScript, Prisma, Docker, or AWS
• Experience mentoring others or leading small projects
• Familiarity with Scrum or Agile workflows

 

Why Join Us?

• You’ll ship real features from day one
• You’ll work in a clean, modern codebase with active mentorship and collaboration
• You’ll have a clear growth path into a tech lead role
• You’ll help scale a fast-growing product and business
• We’re a diverse, product-focused team (average age: 27, over 50% women)
• You’ll have the freedom to shape how we build software as we grow

 

Benefits

• Transparent compensation table and performance reviews every 6 months
• Two annual bonuses based on performance
• Housing allowance for those living near Shibuya
• Dedicated budget for learning, certifications, and study
• One remote work day per week (after the first 6 months)

 

How to Apply

You don’t need a perfect resume. If you’ve looked into KATIX, believe in what we’re building, and are excited to be part of the team, just apply. We’d love to hear from you.