Yohei Senju

A software engineer at CyberAgent, inc.

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Experience

My Career as an Engineer

2023 - Present

Development Lead / Tech Lead

CyberAgent AI Division

Leading development of ad delivery products Dynalyst and GAIN Ads. Driving operations and improvements for a large-scale system handling 400K requests per second. Achieved ¥10M monthly cost reduction through hybrid cloud migration.

ScalaAWSKubernetesSnowflake
2021 - 2023

Backend Engineer

CyberAgent AI Division

Joined the Dynalyst team. Participated in launching GAIN Ads, a DSP for new install advertising. Worked on rebuilding the delivery system and logging infrastructure, and improving performance.

ScalaAkkagRPCDynamoDB
2018 - 2021

Engineer

aisaac, Inc.

Interned at a startup company. Handled the networking domain in application development, gaining a holistic perspective of system architecture.

Web DevelopmentNetworkBackend

Tech Stack

Covering a wide range of technologies from large-scale distributed systems to data infrastructure

Languages

  • Scala
  • Java
  • Ruby
  • TypeScript

Infrastructure

  • AWS (ECS, S3, Kinesis, Lambda)
  • GCP
  • Kubernetes
  • Terraform

Middleware

  • MySQL
  • Redis
  • Kafka
  • NGINX
  • DynamoDB

Data & Analytics

  • Snowflake
  • EMR / Spark
  • Datadog

Tools & CI/CD

  • CircleCI
  • GitHub Actions
  • Digdag

Domain Expertise

  • DSP / RTB
  • Ad Network Optimization
  • Bidding Logic
  • Data Infrastructure