Build Large-Scale Ad Platforms | Java Full‑Stack Engineer

Join a high-impact ad tech team as a full‑stack Java engineer, taking ownership from design through production for large-scale marketing platforms. Collaborate across Tokyo and global teams to deliver reliable, data-driven systems and continuously enhance performance using modern tooling and AI.

Client Details

Our client is a leading Japanese internet and e‑commerce group with a significant advertising business supporting large-scale ad sales. The organization operates globally across Asia with distributed engineering teams and focuses on building advanced ad platforms leveraging big data and modern cloud technologies.

Description

Project Execution

• Gather and analyze requirements; translate business needs into technical solutions
• Design systems and implement features using Java (Spring Boot/Batch)
• Conduct code reviews and maintain high code quality standards
• Perform unit testing, validation, and verification
• Manage deployments (DEV/STG/PROD) and handle rollbacks when needed
• Monitor post-release performance and conduct ongoing maintenance

• Work closely with project managers, tech leads, architects, and engineers
• Partner with QA and DevOps teams for quality and reliability
• Collaborate within cross-cultural, cross-border development teams

• Proactively identify technical improvements across systems and products
• Anticipate future business needs and recommend scalable solutions
• Explore and adopt emerging technologies, including AI tools and models

Job Offer

• Opportunity to build and scale high-impact ad platforms within a major tech ecosystem
• Exposure to global, cross-functional teams across Asia
• End-to-end ownership with strong engineering autonomy
• Access to large-scale data environments and modern AI tooling
• Long-term engagement with stable project continuity

To apply online please click the 'Apply' button below. For a confidential discussion about this role please contact Serena Wu on +81 3 6627 6137.