株式会社 UPSIDER
Open positions
B254. Backend Engineer - 請求基盤(Hermes)
Backend engineer on UPSIDER's 'Hermes' team, building the billing platform at the heart of its fintech products: designing invoice-to-payment-to-collections workflows in Go and Temporal, with high-precision financial calculations. Full remote / full flex (Tokyo office listed); stack includes gRPC, Kubernetes/GKE, MySQL, Prometheus, Terraform. Salary ¥8.1M–¥12M.
B257. FullStack Engineer - 法人審査基盤(Hestia / CfC)
Full-stack TypeScript engineer at UPSIDER (Tokyo-based fintech) building its corporate credit-review/underwriting platform: customer onboarding/eKYC screens, internal review-operator admin tools, and shared backend APIs/event integrations. Stack: React 19, Node.js/Hono, Prisma/PostgreSQL, gRPC/Pub/Sub, GCP; full remote, full flex.
B301. Systems Engineer（Corporate DX/AX）
Systems engineer at UPSIDER (fintech) to redesign corporate functions — Legal, Compliance, Risk Management, HR, Accounting — around AI: building LLM-based business systems, data platforms with audit trails/access control, and evaluation frameworks. Stack: Python/Go/TypeScript, Google Cloud, BigQuery, Terraform, dbt, Claude/Gemini. Full remote, full flex.
B243. Backend Engineer - 基盤開発(Solaris)
Backend engineer (Tokyo office, full-remote/full-flex) to lead design, development, testing, and operations of a new corporate-card platform foundation for alliance partners at UPSIDER, integrating with the existing payments stack. Stack: Go, gRPC/REST, PostgreSQL, GCP, Kubernetes, Terraform.