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

Tokyo 23 Wards Temporary ¥6,000,000 - ¥8,000,000 per year Foreign Multinational View Job Description
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.
  • Work on high-scale ad platform powering billions in revenue
  • Own design-to-deploy lifecycle in a global, AI-forward team

About Our Client

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.

Job 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

Collaboration

  • 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

Drive Continuous Improvement

  • 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

The Successful Applicant

  • 5+ years of hands-on software development experience
  • Strong system design, coding, and problem-solving abilities
  • Practical experience with Agile/Scrum methodologies
  • Proactive, ownership-driven, and able to perform under pressure
  • Effective communicator with both technical and non-technical stakeholders
  • Experience with AI-assisted development tools (e.g., Copilot, Claude, Cursor)

Technical Skills (Must-Have):

  • Java (Spring Boot, Batch)
  • MySQL and NoSQL (e.g., MongoDB)
  • Cloud/data tools (e.g., GCS, BigQuery, Dataproc or equivalent)
  • Kafka (or similar streaming platforms)
  • Git and issue/project tracking tools (e.g., Jira)

Nice-to-Have:

  • Big data technologies (Hadoop, Hive, Spark)
  • Frontend frameworks (React, Angular)
  • Additional NoSQL (Redis, Cassandra, Couchbase)
  • CI/CD (Jenkins), testing (JUnit), code quality tools (Sonar)
  • BI tools (Tableau, MicroStrategy)
  • Enterprise/data pipeline architecture design experience

Language Requirements:

  • English: Business conversational level
  • Japanese: Not required

What's on 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



Contact
Serena Wu
Quote job ref
JN-062026-7042252
Phone number
+81 3 6627 6137

Job summary

Function
IT
Specialisation
Programming / Development
Specialisation
Technology & Telecoms
Location
Tokyo 23 Wards
Job Type
Temporary
Consultant name
Serena Wu
Consultant phone
+81 3 6627 6137
Job Reference
JN-062026-7042252
Company Type
Foreign Multinational

Diversity & Inclusion at Michael Page

We don't just accept difference - we celebrate it. We encourage applicants from all backgrounds to apply for this role and are committed to building inclusive, diverse workplaces where everyone can thrive. If you require any support or reasonable adjustments during the recruitment process, please let us know.