Migaku is looking for a Senior/Staff Backend Engineer to support our rapid scaling from 10k+ users. In this role, you will split your time between high-level architectural design and hands-on individual contributions. You’ll tackle significant technical challenges as we grow, including cross-device data sync, large-scale data processing, and real-time multimedia processing.

What You'll Do

Act as a senior/staff engineer within a team of ~4 backend engineers, collaborating frequently with the broader engineering team.
Develop client- and server-side backends on Google Cloud for new features, primarily using Kotlin or TypeScript.
Design feature and system architectures that meet robustness and scalability requirements.
Integrate with third-party systems such as LLMs or payment providers.
Mentor other backend team members.
Develop proof of concepts and implement features end-to-end.
Proactively suggest and carry out system and team improvements.

What We're Looking For

Proficiency in English and strong communication skills with both technical and non-technical stakeholders.
A role-model individual contributor capable of developing end-to-end features quickly.
Strong practical experience and theoretical understanding of scalable system designs and data structures.
Experience implementing cloud-based services.
Ability to work independently, prioritize your own tasks by balancing importance and urgency, and switch contexts quickly when needed.
A positive, solution-oriented attitude.
Ability to work in a diverse, fully remote team, with generally 4+ working hours overlap with JST timezone.

Nice to Have

Learned (non-native) 1+ spoken language to a high level and/or experience with CJK languages (Chinese, Japanese, Korean).
Experience with Google Cloud Platform, Docker, and/or Firebase.
Experience with Kotlin and/or TypeScript.
Experience in mobile development (e.g., iOS or Android native development and/or Kotlin Multiplatform).
Experience working with versioned release processes and/or multi-repo dependency coordination.
Experience interacting directly with user communities.