We’re looking for a Senior Backend Engineer who thrives at the intersection of architecture, execution, and business understanding.
In this role, you’ll lead the design and evolution of backend systems that serve as shared infrastructure across product teams. You’ll help re-architect legacy components pragmatically, shape platform-level tools, and create services that turn complex business needs into flexible technical building blocks.
Tech Stack
We use a modern, cloud-native architecture. You don’t need to be fluent in everything, but familiarity with several is highly valued:
- Languages: Go (primary), TypeScript, Python
- APIs: gRPC, REST, Protocol Buffers
- Infrastructure: AWS (EKS, RDS, S3), Kubernetes, AWS Amplify, RDS Proxy
- CI/CD & GitOps: GitHub Actions, ArgoCD
- Observability: Datadog (APM, metrics, logs)
- Databases: Amazon Aurora (MySQL-compatible), Vector DB, Redis
- Search: OpenSearch
- Realtime Communication: WebSockets, Server-Sent Events (SSE), gRPC streaming
- Authentication & Identity: AWS Cognito, JWT, internal session systems
- Frontend Touchpoint: React (via product teams), OpenAPI/.proto SDK generation
Responsibilities
- Design and implement scalable backend services and APIs that support cross-team usage and reduce redundancy.
- Translate complex and evolving business requirements into modular systems with clear separation of responsibilities.
- Drive re-architecture efforts that balance delivery speed, reliability, and long-term maintainability.
- Collaborate with product teams to ensure foundation systems empower them to move fast without reinventing the wheel.
- Apply strong testing, observability and monitoring practices to ensure operational excellence.
- Work across service boundaries and repositories to design cohesive solutions.
- Guide system design discussions and mentor team members on architecture, reliability, and code quality.
Requirements
- 5+ years of backend software engineering experience, with a track record of delivering robust, scalable systems.
- Proficient in at least one backend programming language and open to working across stacks.
- Deep understanding of API design, data modeling, distributed systems, and software abstraction principles.
- Experience working on systems used by multiple product teams or customer-facing domains.
- Familiarity with service-oriented or micro-service architectures and tooling such as gRPC, Protocol Buffers, Kubernetes, CI/CD platforms, and observability tools like Datadog.
- Ability to collaborate across backend, frontend, and infrastructure disciplines with strong communication skills.
Nice to haves
While not specifically required, tell us if you have any of the following.
- Understanding of the Identity Provider (IDP) domain and security concerns such as authentication flows, token management, and session modeling.
- Experience working with modern AI agent tooling or MCP (Model Context Protocol) server architectures.
- Familiarity with frontend technologies or patterns - enabling better API design and integration.
- Exposure to multi-tenant systems, permission models, or platform product design.
- Contributions to internal developer tooling, libraries, or DX initiatives.
Compensation
¥6,000,000 ~ ¥12,000,000 annually.
