Acting as Lead software engineer. Designed and developed a global cross-border e-commerce platform. - Planning: global e-commerce platform based on Spring Framework: streaming, multilingual, membership, home organization, product details, shopping cart, order, etc. - Development of payment platform: Interlocking with PG's manual payment method / PayPal integration - HLS platform development: User uploaded video HTTP Live Streaming processing. Cloud Pub/Sub, Cloud Run(serverless) - Infrastructure operation: Cloud DNS, GCLB, GKE, PostgreSQL, GCS, BigQuery, etc. - Service infrastructure construction in 10 AWS countries: Route53, LB, EC2, security group management - Big Data ETL Construction: PostgreSQL data to GCS, GCS to BigQuery ETL - Automated processing of all processes by linking with Jenkins

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Conducting prior research for the company's future - Machine Learning R&D: BJ Speech Recognition, Speech Synthesis, Noise Removal Prior Research & Development. Based on [Deep Speech 2](https://arxiv.org/abs/1512.02595), check the result of SOTA level - AKKA-based large-capacity chat server development: Cumulative downloads 15 million, MAU (monthly active users) 2.2 million. Re-developed Node.js-based chat server based on AKKA considering scalability and high availability

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It is developed in charge of all notification sent by the company. - Notification platform development: Planning & development of a platform that can send push, notification, text, email, and fax. All notifications that depended on AWS EC2 were converted to Serverless Lambda, and the introduction of Notification Talk reduced the total text sending cost by more than 500 million won a year.

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Development of anti-spam filter for integrated email security solution - Development of anti-spam solution in the form of appliance. Developed with care about application memory usage.

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Development of Linux kernel and large log processing application - Development of 2.6 kernel process for firewall log processing: In a multi-core environment, the kernel queue is used to ensure that all cores are processed equally. - Developing an application that communicates with the kernel and netlink to bulk load logs into mysql.

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