Kaito Kinjo

Senior Platform Engineer at ROMS

Tokyo, Japan · Remote

• Designed and implemented an OAuth 2.0–compliant authentication platform enabling unified and secure access across internal and external applications and APIs.
• Architected a schema-driven platform using gRPC and domain-driven design, spanning frontend, backend, and infrastructure layers.
• Led the migration of frontend architecture from Remix to React Router v7 to improve scalability, maintainability, and platform consistency.
• Developed high-performance gRPC services in Go and defined shared schemas for type-safe communication across teams.
• Managed cloud infrastructure using Terraform, implementing Infrastructure as Code to support reproducible, multi-environment SaaS deployments.

React, Next.js, Node.js, TypeScript, React Native, Expo, Remix, React Router

Frontend Consultant (Web & GIS) at kettle

California, USA · Remote

• Developed geospatial web applications from the ground up using Next.js and Mapbox GL JS, focusing on scalable frontend architecture and rendering performance.
• Implemented static vector tile delivery with PMTiles for fast access to large-scale analytical geospatial datasets.
• Built and deployed dynamic vector tile infrastructure with Martin to support scalable real-time geospatial data distribution.

Platform Engineer at ROMS

Tokyo, Japan · Remote

• Developed an automated warehouse management dashboard using Next.js.
• Integration project to renew existing dashboards, adoption of Next.js App router with RSC support, migration from SPA with GraphQL.
• Design and implementation of authentication and authorization features for multi-tenancy.
• Created a KIOSK app for small unmanned shops and developed a Picking Android app for retailers by Expo, managing over 100 client devices with Android Management API.
• Adopting schema-based and test-driven development.

React, Next.js, Node.js, TypeScript, React Native, Expo, Remix

Lead Engineer at yodayoda

Kyoto, Japan

• Developed 3D map maintenance service for self-driving cars, product design, data pipeline development.
• Experienced project management of global teams of researchers and engineers.
• Design and development of a drive recorder and navigation applications using Swift and the Mapbox Navigation SDK, including user testing conducted in San Francisco, US.
• Development of 3D visualisation tools using three.js, automated driving simulation of 3D maps using Autoware, pose estimation and 3D creation from lidar scan using Cartographer SLAM.
• Selected by Alchemist X as BtoB startups in 2021.

React, TypeScript, Three.js, Swift, Python, Ruby, PostgreSQL, Firebase, Mapbox, QGIS

Software Engineer at Nightley

Tokyo, Japan

• Developed geospatial analysis web application.(inbound insight)
• Manage large-scale data analysis platform, estimation of tourists' nationality and place of stay from SNS data. Collaboration project with the CSIS(Center for Spatial Information Science) of Tokyo University.
• Developed a web application from scratch in one month. Within three months we got 1,000 enterprise users.
• Visualisation of statistics data on maps using Mapbox GL JS, integration of client data and own location data.
• Front-end developping for managing complex map states using Vue.js, Vuex.

Vue.js, Vuex, PHP, Laravel, Python, Redis, PostgreSQL, PostGIS, MySQL, Mapbox

Software Engineer, Project Manager at Station P

Okinawa, Japan

• Enterprise software development at StationP, working as a development partner in collaboration with NEC.
• Contributed to project management and development of an ERP system for satellite manufacturing and development operations.

Java, C#, PHP, JS, Oracle, PostgreSQL