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I'm a software engineer with a passion for building large-scale, real-time data systems. I enjoy turning complex data problems into reliable, scalable backend solutions using Python, Java, and distributed technologies like Flink, Kafka, and Spark. Most recently at SmartNews and Tokyo Ads, I've led design improvements for ad targeting and data quality pipelines, delivering fast, real-time insights to millions of users and improving system reliability and efficiency. I thrive in collaborative teams and love solving hard problems at the intersection of data engineering and software development.…I'm a software engineer with a passion for building large-scale, real-time data systems. I enjoy turning complex data problems into reliable, scalable backend solutions using Python, Java, and distributed technologies like Flink, Kafka, and Spark. Most recently at SmartNews and Tokyo Ads, I've led design improvements for ad targeting and data quality pipelines, delivering fast, real-time insights to millions of users and improving system reliability and efficiency. I thrive in collaborative teams and love solving hard problems at the intersection of data engineering and software development.

Lynn

PRO

Full Stack Developer, Back-End Developer, Web Developer, +2

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I'm a software engineer with a passion for building large-scale, real-time data systems. I enjoy turning complex data problems into reliable, scalable backend solutions using Python, Java, and distributed technologies like Flink, Kafka, and Spark. Most recently at SmartNews and Tokyo Ads, I've led design improvements for ad targeting and data quality pipelines, delivering fast, real-time insights to millions of users and improving system reliability and efficiency. I thrive in collaborative teams and love solving hard problems at the intersection of data engineering and software development.…I'm a software engineer with a passion for building large-scale, real-time data systems. I enjoy turning complex data problems into reliable, scalable backend solutions using Python, Java, and distributed technologies like Flink, Kafka, and Spark. Most recently at SmartNews and Tokyo Ads, I've led design improvements for ad targeting and data quality pipelines, delivering fast, real-time insights to millions of users and improving system reliability and efficiency. I thrive in collaborative teams and love solving hard problems at the intersection of data engineering and software development.

Available to hire

Tokyo, Japan

I’m a software engineer with a passion for building large-scale, real-time data systems. I enjoy turning complex data problems into reliable, scalable backend solutions using Python, Java, and distributed technologies like Flink, Kafka, and Spark.

Most recently at SmartNews and Tokyo Ads, I’ve led design improvements for ad targeting and data quality pipelines, delivering fast, real-time insights to millions of users and improving system reliability and efficiency. I thrive in collaborative teams and love solving hard problems at the intersection of data engineering and software development.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Japanese

Fluent

Work Experience

Software Engineer at SmartNews, Inc.

October 1, 2024 - Present

Built and optimized real-time data processing pipelines and backend services using Python, Java, SQL, Flink, Kafka, NoSQL and Airflow. Led redesign of the Custom Audience ad targeting system, improving reliability to 99.9%+ SLA and restoring advertiser trust. Implemented a real-time location indexing system with Kafka and Flink for ~15 million users, achieving ~6 ms latency in ad targeting with real-time processing and batch processing. Drove cost-optimization initiatives for audience storage and processing (~32% savings) and contributed to data quality infrastructure and dashboards across Kafka, Flink, DynamoDB, and external sources.

Data Analyst at Japan Next Co., Ltd.

April 1, 2020 - September 1, 2021

Analyzed large-scale, high-frequency financial market data (prices, trades, volatility) to generate actionable insights for trading and business strategy. Built reliable data pipelines and analytics reporting ensuring data accuracy, reproducibility, and timely delivery for executive decision-making.