Engineering robust, scalable backend solutions to solve complex business problems
Translating business requirements into robust backend solutions using Java, Kotlin, Rust, or Go.
Modernizing outdated systems while ensuring business continuity and improved performance.
Expert guidance for entrepreneurs and graduate projects, focusing on architecture, scalability, and best practices.
Re-engineered a personalized asset delivery system, replacing a legacy multi-tenant solution with a streamlined Spring Boot 3.2 (Kotlin) application using coroutines and asynchronous caching. Achieved 8,000 RPS with minimal latency, exceeding peak demand of 7,000 RPS.
Led the migration of 36 Spark-Scala ETL jobs and 51 data lake tables to a new architecture, achieving a cost reduction of 548,000 yen daily (200 million yen annually) while maintaining data integrity and system performance.
Spearheaded the architecture and development of high-throughput, low-latency push notification services handling 120+ million daily notifications for diverse use cases, including transactional and promotional campaigns.
Designed and implemented a timeline notification delivery system from scratch, including drafting, requirements analysis, and implementation with Kotlin, Spring WebFlux, Cadence Workflow, and Kafka integration. Reduced 100 hours per month for the marketing team and increased annual GMV by 4M JPY.
Thorough understanding of business requirements and technical constraints before proposing solutions.
Creating robust, scalable architectures with a focus on correctness, performance, and maintainability.
Clean, efficient code using modern best practices and appropriate technologies for each problem.
Timely execution with clear documentation and knowledge transfer to ensure long-term success.
I work on a project basis rather than hourly, dedicating 4-5 hours daily outside regular working hours to ensure focused and effective delivery.
8:00 PM - 12:00 AM (GMT/JST)
8:00 AM - 10:00 PM (GMT/JST)
* Time zone is GMT or JST, depending on my current location.
Send an email with your requirements to:
I'll get back to you within 1-2 business days with a response to your inquiry.