This position is closed and is no longer accepting applications.

Senior/Lead Engineer

Lunaris Musashino-shi, Tokyo
  • 💴 ¥8M ~ ¥12M annually
  • 🏡 Partially remote
  • 🧪 5+ years experience required
  • 💬 No Japanese required
  • 🗾 Japan residents only
  • 🧳 No relocation support

About Lunaris

Lunaris Musashino-shi, Tokyo

We started out as an otaku-centric online shop called Solaris Japan, and now offer solutions to other e-commerce platforms. We're small enough to where your ideas and work can have a huge impact but self-funded, and mature enough to be stable.

Key benefits

  • Self-funded and stable
  • Free weekly Japanese lessons
  • Free weekly massage

About the position

We are looking for a senior/lead engineer to join us! In this role, you’ll have an opportunity to lead development on several e-commerce products and features using Elixir with the Phoenix framework, React, and PostgreSQL.

As a small, self-funded company with around 10 members on our engineering team, you’ll have an opportunity to really make an impact and drive the direction of the team and company going forward. As such, we are looking for someone who has both excellent technical knowledge and skills, as well as someone who can be invested in the future of the engineering team and the company as a whole. If you’re someone who takes initiative, is assertive, and approaches complex problems with confidence and care, you’ll excel on our team.


  • Lead development on performant and scalable systems across our products
  • Have a keen eye for quality UX
  • Play an active role in shaping the engineering team by participating proactively in the recruiting and interview process, onboarding, and fostering growth through mentorship and performance reviews
  • Be forward thinking; consider not just what exists now, but also what the company can do in the future with technology and for our current and future clients
  • Set standards for the engineering by defining code review and testing practices


  • At least 5 years of experience as a full stack software engineer
  • At least 5 years of experience designing relational databases and writing performant SQL queries using PostgreSQL (preferred) or another RDMS
  • Experience leading software project development from conception to release
  • Experience with cloud infrastructure such as AWS (preferred), GCP or Azure
  • Experience with front-end technologies such as React (preferred), Vue or Angular

Nice to haves

While not specifically required, tell us if you have any of the following.

  • Previous professional experience with Elixir and Phoenix framework
  • Knowledge of CI/CD
  • Experience with container orchestration with tools like Docker and Kubernetes
  • Previous experience mentoring other engineers
  • A degree in computer science or other related field


8 to 12 million JPY annually.

Includes bonuses, paid out twice per year

Hiring Process

  1. 1

    Online Interview with Founder and Senior Engineer(s) - 60min

    We’ll discuss your engineering background and past experience, and give you a chance to learn more about our company.

  2. 2

    Technical assignment

    You’ll have a chance to show off your technical skills by completing a small assignment. You have some freedom in what language(s) and technologies you use to complete this assignment, so don’t sweat it if you’ve never used Elixir before!

  3. 3

    In-person or remote interview with the team - 90-120min

    If you’re currently based in Japan, you’ll have an opportunity to enjoy lunch or dinner (on us!) at our office in Kichijoji. If you’re based outside of Japan, we’ll have a group video call. Either way, this will be a chance to meet and talk with members from various teams at our company. After that, there will be a technical interview with our engineers where you’ll discuss your solution to the above technical assignment as well as discuss other technical topics.

Meet Lunaris's Developers

Sébastien is a developer at Lunaris, where he is in charge of developing and maintaining their ecommerce site, Solaris Japan, and the related applications. He talks about what makes Lunaris stand out as a workplace and how he turned a part-time opportunity into his current role.

Read his story...

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