Senior Software Engineer, Advertisement Optimization Group - Merchandising and Advertisement Department (MAD)
Location: Tokyo, Japan
Time Type: Full time
Job Description
Job Description:
Business Overview
Rakuten is a leading Japanese e-commerce and internet services company that offers a wide range of products and services to customers worldwide. With a strong focus on innovation, Rakuten aims to empower individuals, businesses, and society as a whole through its unique ecosystem of e-commerce, fintech, digital content, and communications services.
Department Overview
The Merchandising and Advertisement Department leverages AI-driven advertisement optimization, and pricing and inventory optimization systems based on demand forecasting. By closely integrating the information obtained from merchandising into our advertisement strategies, we maximize the synergy between both functions. This enables us to efficiently deliver optimal offers and information to our customers, thereby contributing to increased sales and enhanced customer satisfaction.
The Advertisement Optimization Group is a team of specialists in ad optimization, with AI at its core. We are responsible for the development and operation of highly effective ad optimization logic and platforms.
Our mission is to maximize publishers' ad revenue while maintaining and improving advertisers' ROAS (Return On Ad Spend). Specifically, we continuously improve ad delivery optimization, bidding/budget allocation, personalization, and performance measurement, contributing to the realization of a world that enhances both advertisers' ROI (Return On Investment) and user experience.
Position:
Position Details
We are looking for a Senior Software Engineer to lead the design, development, and optimization of complex data processing pipelines and high throughput APIs. You will guide technical decisions, mentor engineers, and ensure that our platforms remain robust, scalable, and aligned with long-term business goals. This role is ideal for individuals who thrive in highly technical environments and enjoy solving challenging problems with modern engineering practices.
Responsibilities
- Lead the design and architecture of large-scale, distributed software systems.
- Develop high-quality, maintainable code across the full SDLC.
- Collaborate with product, design, and engineering stakeholders to define technical requirements and project scope.
- Drive engineering best practices including code reviews, testing strategies, standards, and documentation.
- Mentor and support junior/mid-level engineers through guidance, pairing, and knowledge sharing.
- Identify and resolve complex issues related to performance, scalability, and system reliability.
- Contribute to long-term technical strategy, platform modernization, and technology roadmap planning.
- Evaluate and integrate new tools, frameworks, and technologies to improve development efficiency.
- Experience leading technical initiatives, migration projects, or cross-team engineering efforts.
Mandatory Qualifications:
- Bachelor’s or Master’s degree in Computer Science, Engineering, or equivalent experience.
- 10+ years of professional software engineering experience.
- Deep expertise in at least one modern language (e.g., Python, Java, Go).
- Strong understanding of system design, distributed systems, microservices, and cloud architectures.
- Experience with REST APIs, event-driven systems, and asynchronous processing.
- Proven experience developing and deploying applications on GCP.
- Strong competency in data structures, algorithms, and software design patterns.
- Hands-on experience with CI/CD, testing frameworks, and Git-based workflows.
- Ability to navigate technical ambiguity, make sound architectural decisions, and clearly articulate technical trade-offs to both technical and non-technical audiences.
Desired Qualifications:
- Experience with Docker, Kubernetes, or other container orchestration tools.
- Background in high-availability or mission-critical systems.
- Knowledge of SQL/NoSQL databases, caching strategies, and data pipelines.
- Familiarity with observability tools (Prometheus, Grafana, ELK, OpenTelemetry).
- Exposure to security best practices, secure coding, and compliance requirements.
#engineer #applicationsengineer #AI #aianddatadiv
There are more than 50,000 engineering jobs:
Subscribe to membership and unlock all jobs
Engineering Jobs
60,000+ jobs from 4,500+ well-funded companies
Updated Daily
New jobs are added every day as companies post them
Refined Search
Use filters like skill, location, etc to narrow results
Become a member
🥳🥳🥳 452 happy customers and counting...
Overall, over 80% of customers chose to renew their subscriptions after the initial sign-up.
To try it out
For active job seekers
For those who are passive looking
Cancel anytime
Frequently Asked Questions
- We prioritize job seekers as our customers, unlike bigger job sites, by charging a small fee to provide them with curated access to the best companies and up-to-date jobs. This focus allows us to deliver a more personalized and effective job search experience.
- We've got over 200,000 jobs from 15,000+ vetted companies. No fake or sleazy jobs here!
- We aggregate jobs from 15,000+ companies' career pages, so you can be sure that you're getting the most up-to-date and relevant jobs.
- We're the only job board *for* software engineers, *by* software engineers… in case you needed a reminder! We add thousands of new jobs daily and offer powerful search filters just for you. 🛠️
- Every single hour! We add 2,000-3,000 new jobs daily, so you'll always have fresh opportunities. 🚀
- Typically, job searches take 3-6 months. EchoJobs helps you spend more time applying and less time hunting. 🎯
- Check daily! We're always updating with new jobs. Set up job alerts for even quicker access. 📅
What Fellow Engineers Say