Member of the Database Engineering team under Application Data Services, Central Tech.- Perform capacity testing and fleet sizing for multi-hundred node MySQL clusters- Develop features for tooling and APIs (Python, Go) to provision and manage multi-cloud infrastructure for MySQL servers- Resolve highly critical violations related to capacity, failover and backup testing as well as security patching to ensure business continuity- Participate in the on-call rotation schedule (support internal requests, investigate issues related to database performance/availability/replication, join firefighting calls, define SLIs, write post-mortems after outages)- Participate in mass failover testing to stress infrastructure and check the resilience of database clusters- Migrate production-grade cron jobs from Puppet to a distributed, highly-available cron job management system as well as Booking Kubernetes Service (BKS)- Contribute features to MySQL Availability Reporter to measure availability and latency of production MySQL servers- Participate in SRE and Observability++ initiatives

Member of the Ezmeral RnD organization. Architecture and design of an observability stack for Data Fabric and Unified Analytics clusters. Involved with Kubernetes, OpenTelemetry, Prometheus, Grafana, Keycloak and Helm.

Member of the Core/Platform team, worked on components and features around Arrikto's cloud-native data storage framework (Rok):- Improved Rok's scalability on Kubernetes by reducing deployment times by 40% on clusters with 300+ nodes- Implemented mechanism for Arrikto's Container Storage Interface (CSI) driver to prevent loss of node-local volumes- Implemented features for Arrikto's volume manager that discovers, prepares and manages disks on major cloud providers (AWS, GKE, AKS)- Contributed to the configuration of Istio as service mesh (mTLS, authz) for Arrikto's stack- Mentored junior team members and participated in software release cycles- Provided enterprise-grade customer support on high-severity incidents

Design and implementation of web applications using Spring Boot, Maven, Docker, Vue.js and Oracle Databases. Established the Git Feature Branch workflow within my team. Monitored the availability of running services and mitigated incoming cyber attacks.

Member of the platform team, worked on components and features around Arrikto's cloud-native data storage framework (Rok):- Open-source contributions to Kubeflow (https://github.com/kubeflow/kubeflow)- Author and maintainer of the operator that installs, upgrades and manages Rok clusters on Kubernetes- Enhanced data security by adding support for transparent, block-level disk encryption using LVM and Device Mapper's dm-crypt target- Delivered an end-to-end monitoring stack for Rok clusters on Kubernetes - instrumented Python components to expose Prometheus metrics and built custom Grafana dashboards- Author of a declarative GitOps CLI that configures and deploys Arrikto's stack on Kubernetes (EKS, GKE, On-premises)- Delivered a framework for unattended upgrades of Rok clusters running on Kubernetes

Member of the SDN/NFV Agile team. Developed OpenStack and Opendaylight extensions to integrate heterogeneous Wi-Fi Access Points, providing centralized network management. Implemented the SNMP protocol as well as northbound/southbound APIs. Extended unit and e2e test suites. Introduced CI/CD pipelines with Jenkins. Packaged applications with Docker.

As a full-time intern delivered a reusable, feature-rich visualization library for the CERN Document Server (CDS), one of the largest data repositories in High Energy Physics. Heavily involved with Invenio, Elasticsearch, Flask, D3.js and REST APIs to efficiently retrieve, manage and visualize large-scale data. Worked with top-class engineers and enhanced my communication skills.

Thesis: An Ontology-based Data Center Infrastructure Monitoring Platform withProgrammatic ControlSupervisors: N. Koziris, V. Koukis, C. VenetsanopoulosDesigned and implemented a full-stack, ontology-based platform that offers real-time monitoring of Data Center infrastracture. My work involved Ceph, QEMU, InfluxDB, Icinga, Python, RESTful APIs, Grafana, SVG and Angular.