- Kubernetes기반 플랫폼 설치/운영** monorepo로 구성된 github repository에 Jenkins pipeline으로 CI/CD 구성** canary build, rolling update, multi-staged deployment** AWS사용 : ec2 master/node + ELB + route53- microservice architecture설계/개발** grpc server/client개발, gradle을 통해 build시 grpc code생성** grpc gateway개발** git workflow적용, code review프로세스 적용, code standard개발, linter 및 static analyzer(sonar)적용** git branch별 cluster provisioning개발** BDD framework(cucumber) 설계/개발- event sourcing architecture 설계/개발** axon framework기반 business workflow구현- data streaming architecture 설계/개발** kafka streams + kafka connect

kubernetes based CI/CD service development/operation- https://github.com/kakao/cite- integrated github enterprise to kubernetes.- on git push1. build & push docker image by buildbot2. create kubernetes service and replication controller3. update netscaler loadbalancerapp log & statistics service development/operation- aggregate server logs into multiple sinks : elasticsearch, hadoop hdfs, hbase, apache spark- stream processing via apache sparkkakaotalk(http://www.kakao.com/services/8) server development/operation- talk oauth2 server for authenticate users- media transcoder : transcode media by map/reduce method, using ffmpeg

Authentication- improved password based web authentication security by TLS-SRP integration. Additional system architecture improvement done by replace old in-house authentication middleware to open source nosql key-value storage couchbase.- refactoring : selenium2 based functional test design, prototype, implementUser Management- cleared out user personal information by replace korean SSN to DupeInfo/ConnInfo.- refactoring : robot framework functional test design, prototype, implementCRMS(Customer Relation Management Service)- improved and cleared out legacy code base by integrating Spring MVC Framework, Spring Testing Framework. Code coverage from 0 to 90%OpenID Provider- refactored whole code base by develop integrated test cases. Misc- Automated build, test, release cycle by jenkins. Maven profiling used for differentiate test/staging/release build.

IPTV HeadEnd server development- design protocol between STB and HeadEnd. encryption, load balancing, CDN, sync user accounts betwen POP, STB auto upgrade- android STB : web browser, streaming media playermedia transcoder/streaming server- analyze raw contents file and transcode for mobile/web/TV adaptive streaming. create synopsis, P2P CDN- generate torrent file for contents and distribute using private torrent tracker.

tmax ejb framework proframe C/Java development, technical support

EBSi 컨텐츠 관리시스템 개발

PKI서버/클라이언트 개발