Principal Full Stack Software Engineer - Tokyo, Japan

We are looking for a highly experienced, hands-on Principal Full Stack Software Engineer to lead the design, modernization, and delivery of enterprise Direct Marketing digital platforms. 

This role will play a key part in shaping scalable, secure, and innovative solutions that support customer-facing services, Direct Marketing agencies, partner channels, call center operations, customer acquisition, lead management, and servicing capabilities.

Key Responsibilities

•Lead solution architecture, technical design, and modernization roadmap activities across Direct Marketing platforms and related digital ecosystems.

•Convert business needs into scalable, secure, and maintainable technology solutions aligned with enterprise architecture, security, compliance, and operational standards.

•Drive end-to-end full stack engineering across front-end, back-end, APIs, integrations, databases, cloud platforms, DevOps, CI/CD, testing, deployment, and production support.

•Remain actively hands-on through coding, troubleshooting, code reviews, performance tuning, quality improvement, and complex technical issue resolution.

•Lead AI and Generative AI initiatives from PoC and pilot phases through production implementation, including the design and implementation of AI agents, agentic workflows, personalization, predictive analytics, agent-assist capabilities, content automation, conversational AI, and Copilot solutions.

•Partner effectively with business stakeholders, product owners, architects, project managers, vendors, and engineering teams, while communicating complex technical concepts clearly to both technical and non-technical audiences.

Requirements:  Please describe the required competencies, including experience, skill sets, etc.

Required Experience and Skills

•10+ years of software engineering experience in enterprise-scale environments, with a strong track record of leading full stack development and technical solutioning.

•Proven experience designing and delivering digital platforms for customers, Direct Marketing agencies, partners, call center operators, and internal business users.

•Strong hands-on engineering capability across solution design, coding, testing, deployment, production support, root cause analysis, performance tuning, security remediation, and complex issue resolution.

•Deep technical expertise in full stack development, solution architecture, system design, React/Angular/Vue.js, .NET/Java/Node.js/Python, APIs, integration, cloud platforms, databases, CI/CD, DevOps, security, performance, and scalability.

•Hands-on experience designing and implementing AI/ML, Generative AI, AI agents, agentic workflows, conversational AI, or Copilot-based solutions from PoC and pilot phases through production implementation; experience with Microsoft Copilot, Azure AI Services, Azure OpenAI/OpenAI, MarTech, CRM, CDP, marketing automation, or similar platforms is preferred.

•Ability to work effectively in Agile, global, and cross-functional environments; cloud, AI, or architecture certifications are a plus.

•Business-level English and Japanese communication skills are required; Japanese proficiency equivalent to JLPT N2 or above is expected.

Key Competencies: Technical leadership, full stack engineering, solution architecture, AI/Generative AI implementation, AI agent development, hands-on delivery, platform modernization, structured problem solving, stakeholder engagement, and business/technology alignment.

Success Profile: The ideal candidate is a senior technical leader who can set architectural direction, drive AI-enabled innovation, and personally contribute to high-quality software delivery for modern digital solutions supporting customers, Direct Marketing agencies, and call center operations.