AI Platform Engineer (Backend / Architect)

SoftBank

Backend

GraphQL

JavaScript

About this role

This role sits within the system infrastructure development team responsible for building platforms that support enterprise AI use. The focus is an AI agent foundation that connects internal data, APIs, source code, and documentation while enabling secure and consistent business-system operations.

The engineer leads architecture and development across ontology and Knowledge Graph design, RAG integration, GraphQL gateways, REST API standardization, MCP Server connectivity, transaction control, approval and authorization flows, and update APIs for AI agents. The named stack includes Java with Spring Boot, Apache Beam, Netty and Reactor; Node.js, Python and Rust; PostgreSQL, Apache Ignite and Redis; Docker; Kafka, Flink and Solace; and JavaScript, Vue.js and TypeScript. GraphQL, WebSocket, WebRTC, SIP, Asterisk and LiveKit are also listed.

Applicants must have either backend development experience and leadership experience on large-scale business systems, including detailed design, implementation and review, or experience developing and operating backend APIs at an in-house web company together with BFF design experience.

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