Lead Developer

Prototyping Chaos Engineering

Skills: Kubernetes, LitmusChaos, Argo Workflows, GitOps, Flux, Terraform, Istio, Kube-Prometheus Stack, Loki, Nix

• Setup chaos engineering environment with LitmusChaos
• Implemented observability with Prometheus stack
• Created chaos workflows with Argo Workflows for two applications for a basic understanding of chaos engineering
• Introduced disruptions: latency, service outages
• Ultimate goal: improve application resilience.

Implemented GitOps processes on AWS, Kubernetes and Terraform

Skills: AWS, Kubernetes, Amazon EKS, GitOps, Flux, Terraform, GitHub, Slack, Datadog, Traefik, Amazon SNS/SQS

• Designed and implemented GitOps deployment processes for AWS EKS-based microservices with Flux and Terraform
• Integrated Kubernetes with AWS IAM
• Built continuous integration pipelines with GitHub Actions
• Connected Flux with Terraform
• Managed inter-service communication mostly asynchronously via AWS SNS and SQS
• Hooked up third-party shop catalog eventing via AWS EventBridge
• Implemented observability with Datadog
• Slack integration for alerting and deployment events
• Implemented service mesh with Traefik Enterprise

Greenfield setup of continuous delivery and infrastructure

Skills: GCP, GKE, Kubernetes, Terraform, Flux, GitOps, GitHub Actions, Apache Solr, Apigee, Clojure(Script), Spring Boot, Kotlin

• Designed and implemented GitOps change processes for Kubernetes and GCP resources
• Boosted team autonomy through infrastructure engineering
• Applied GitOps to Solr resources with Clojure/ClojureScript
• Implemented index feedback via machine learning
• Continuous integration with GitHub Actions
• Operated Solr via operator
• Deployed across three stages
• Wrote k6 load tests for Black Friday and the Super Bowl
• Alerting via OpsGenie, Google Operations and MS Teams
• Integrated Prometheus with Google Operations metrics
• Implemented fast recovery (criticality) via rebuild, restore and reindex
• Built search read cache with GCP Redis
• Executed canary migration with Apigee
• Trained staff on Terraform, Kubernetes and operations

Built cloud platform

Skills: GCP, Open Telekom Cloud, OpenShift, Kubernetes, Terraform, GitOps, Jenkins X, Helm, Skaffold, Draft, Docker, GitLab, Nexus, Docker Registry, ChartMuseum, Monocular, Git, GitLab CI, Prometheus, Elasticsearch, Fluentd, Kibana, Python, Go, Clojure

• Formed platform team to support feature teams
• Improved application lead times
• Deployed and managed various Kubernetes clusters: OpenShift PaaS, Kubespray + Ansible, Telekom CCE
• Covered observability, authentication/authorization (SSO), networking, key management, storage, databases, CI/CD, messaging
• Greenfield setup of GCP infrastructure with Terraform, Cloud Build and GitLab
• Led recovery of a major datacenter incident over a holiday in shifts with a war room

Built cloud-native platform on-premises

Skills: Kubernetes, GitOps, Jenkins X, Helm, Skaffold, Draft, Docker, Jenkins, Nexus, Docker Registry, ChartMuseum, Monocular, Git, Prometheus, Elasticsearch, Fluentd, Kibana, vSphere, Go

• Designed and implemented a highly available and scalable on-premises platform for a consumer document archive with Kubernetes
• Quickly evaluated many cloud-native solutions
• Set up a CI/CD process following GitOps principles
• Chose and configured storage, networking and observability solutions

Launched personal documents online campus

Skills: Java, Alfresco Platform, Spring, Solr, CMIS/REST Services, Freemarker, JavaScript, YUI, Java Swing, Groovy, Spock, Maven, MySQL, Git, Yeoman, Grunt, Bower, npm, AngularJS

• Designed and built a personal document management system (exams, applications, certificates) for students and faculty in a university online campus
• Implemented student lifecycle, document capture, search for editors, student view and authentication
• Integrated into the website
• Setup Linux server infrastructure

Service workflow for technical testing and inspection services

Skills: Java, Alfresco Platform, Spring, Spring Security, Solr, REST Services, Freemarker, JavaScript, YUI, Dojo, Groovy, Spock, Maven, MySQL, Git

• Designed and implemented document management and workflow solution for technical testing and inspection services
• Coordinated contractors and clients through a general contractor for technical services
• Imported service orders via REST interface
• Managed and tracked processes for contractors and clients
• Created processes for different document types like briefings and reports
• Built a multi-tenant solution with proper access control

Sidecar shopping cart

Skills: Groovy, Grails, Spring, jQuery, Spock, Angular, Selenium, Jenkins

• Built a shared-order shopping cart application with the Grails framework and Groovy
• Added features for group buyers, co-buyers and staff
• Communicated with surrounding shop system via REST and SOAP interfaces
• Managed cart and item lifecycles (replicated), co-buyer data and cart merging
• Implemented access control, fraud detection and email notifications

Quote workflow system for heat exchangers

Skills: AWS, Java SE/EE, Spring, Struts, JSP, JMX, JSR-170 (JCR), Groovy, SOAP and REST web services, Bootstrap, Hibernate, MySQL, SQL Server, JBoss, Tomcat, Alfresco Platform, UML, Git

• Designed and built a multi-tenant quote workflow and marketing application
• Integrated with the ERP system
• Tracked quotes
• Managed documents in Alfresco ECM
• Integrated an automatic pricing engine for binding quotes
• Synced data with ERP systems
• Set up Linux server infrastructure

Skills: Linux, Java EE, Spring, Apple WebObjects, Perl, Shell

• Planned, implemented and managed various finance sector projects using Linux, Java EE and Apple WebObjects