English summary for screening — check the original posting before applying.
GenerativeX is seeking a Staff Software Engineer to define and uphold the highest technical standards, making critical architectural decisions across products and client solutions. You will lead efforts to resolve technical debt, evolve architecture, and improve developer experience, impacting business outcomes through technical dialogue with management and client CxOs.
Must-haves
- 8+ years of experience in designing/developing web applications or business systems using TypeScript, Python, Rust, etc.
- Proven track record of leading cross-organizational architecture design/redesign.
- Deep knowledge of designing/implementing non-functional requirements (RBAC, job management, auditing, scaling, security).
- Experience in independently driving infrastructure design to cost optimization in cloud environments (Azure / AWS).
- Ability to communicate and reach consensus on technical matters with management and client CxO-level executives.
- Experience in leading the writing and review of design documents and ADRs.
- Must work onsite in Tokyo and wear a suit.
Nice-to-haves
- Experience in architecture design and production operation of systems utilizing LLM / Generative AI.
- Practical experience in AI agent accuracy evaluation, hallucination countermeasures, and guardrail design.
- Experience in system development in highly regulated industries (finance, pharmaceuticals, manufacturing).
- Experience in designing and implementing multi-tenant SaaS.
- Experience in designing and operating Kubernetes / IaC / CI/CD pipelines.
- Experience in deployment and operation in on-premises or network-isolated environments.
- Experience in leading technical organization management, recruitment, and development.
- Ability to communicate technical information in English.
Tech stack
BunTypeScriptHonoOpenAPIZodPrismaMySQLNext.jsReact 19Vercel AI SDKClaudeOpenAIAzure OpenAIAnthropic Claude Agent SDKOpenAI Agent SDKMCPAzure Container AppsAWSDockerKubernetesBullMQRedisOpenTelemetryVitestPlaywrightGitHubSlackNotion
Work style
Onsite in Tokyo (Marunouchi Building 27F, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo). Discretionary labor system for specialized duties. Standard working hours: 9:00 - 18:00.
Other notes
Salary: 18,000,000 - 30,000,000 JPY (Determined based on experience and skills). Full-time employee. Probationary Period: 3 months.