Principal Infrastructure Engineer / SRE

● Played a pivotal role in architecting a Cloud Native infrastructure within a Hybrid Cloud environment, while spearheading the recruitment and seamless onboarding of a proficient team of Full-Time Employees (FTEs)
● Delivered expert guidance on cloud architecture best practices within a prominent Blockchain Reputation company, ensuring alignment with industry standards and optimal performance
● Established and maintained a robust and scalable AWS EKS (Kubernetes) setup, characterized by its efficiency, cleanliness, and ease of maintenance
● Conducted real-time code profiling and executed comprehensive load and performance testing to optimize system performance and enhance reliability

• ●  Evaluated on-premises infrastructure sizing to ensure optimal resource allocation and efficiency.
• ●  Designed and operated an Extract, Transform, Load (ETL) solution using Jupyter Notebooks and Spark, facilitating efficient data
  processing and analytics

● Provided leadership and mentorship to a team of six DevOps/SRE professionals across the organization, fostering collaboration
and driving operational excellence

● Provided extensive support in maintaining a Hybrid Cloud infrastructure for over four years, ensuring seamless operations and optimal performance
● Diagnosed and resolved issues related to the Active Directory Distributed File System (DFS) roaming profile load balancing setup, leveraging a Prometheus Exporter for Windows machines

• ●  Integrated Active Directory (AD) authentication via Kerberos on Keycloak to enable Single Sign-On (SSO) across various services
• ●  Facilitated the migration and management of a SPNEGO-based AD Single Sign-On (SSO) solution on NGINX endpoints, ensuring

secure and efficient authentication mechanisms

• Implemented and managed CloudFlare Web Application Firewall (WAF) for proactive threat mitigation and incident response,
alongside the ELK (Elasticsearch, Logstash, Kibana) stack deployed on AWS for comprehensive log analysis and monitoring

● Facilitated the organization during the Go-Live phase of the product, ensuring operational readiness of the infrastructure for seamless deployment
● Implemented a metrics-based process to assess product quality from the end user's perspective, thereby influencing Objectives and Key Results (OKRs)
● Directed the activities of a team of 5 Site Reliability Engineers (SREs), overseeing their tasks and ensuring alignment with organizational goals

● Implemented CloudFlare Web Application Firewall (WAF) and managed Incident Response procedures, alongside ELK stack deployment on AWS for comprehensive log analysis

• ●  Managed vendor relationships and supplier partnerships to ensure seamless operations and timely delivery of services
• ●  Designed solutions with a focus on minimizing operational expenditure (OPEX) while maintaining high performance and reliability
• ●  Developed algorithmic approaches for the design of graph overlaps, ensuring efficient indexing and retrieval of data

●  Implemented Kubernetes with Helm, ELK stack, and Grafana/Prometheus, utilizing Docker on VMWARE/Xen virtualized systems.
●  Managed Content Delivery Network (CDN) for Distributed Denial of Service (DDoS) mitigation and DNS management, focusing on reducing the attack surface.
●  Conducted Application Performance Monitoring and assessed overall Infrastructure Performance to optimize system efficiency.
●  Provided support for Extract, Transform, Load (ETL) processes to ensure seamless data integration and processing.

● Conducted thorough evaluations and selection processes for Content Delivery Network (CDN), Secure Sockets Layer (SSL), and Domain Name System (DNS) vendors, providing internal coaching and guidance on related topics within OLX
● Led load and performance testing initiatives and conducted architectural performance design reviews to optimize system efficiency and reliability
● Developed comprehensive capacity planning strategies for migrating from bare-metal infrastructure to cloud-based solutions, ensuring seamless transition and scalability
● Provided coaching and support to over 50 engineers across the organization, fostering skill development and knowledge sharing to drive continuous improvement

● Designed and implemented a robust Network Time Protocol (NTP) infrastructure to ensure precise time synchronization across systems
●  Managed KVM/Ganeti Gentoo's package maintenance, ensuring the stability and reliability of the virtualization environment
●  Served as a subject matter expert in Hadoop, providing strategic guidance and technical leadership in implementing and
optimizing Hadoop-based solutions
●  Architected CEPH storage solutions to deliver scalable, high-performance storage infrastructure tailored to organizational needs.
●  Received official RH training in NYC Q1 2016 “Red Hat Ceph Storage Architecture and Administration (CEPH125)” by J. C. Lopez
●  Designed NFS storage systems to achieve optimal performance, with a throughput of 40 MBps per client and a target egress of 46
Gbps from a single node serving the rack
● Developed a Domain Specific Language (DSL) using the textX library for enhanced functionality and flexibility in querying the
graphite-api
● Provided comprehensive coaching and training to new hires (5), facilitating their integration into the team and ensuring proficiency
in their roles

● Acted as a System Operations (sysop) and Developer for the Business Intelligence team, overseeing critical infrastructure and software development.
● Developed and implemented a Python-based FLASK Google Analytics API fetcher to gather and process data for analytical purposes.

• ●  Installed, configured, and managed a Hadoop/MapR M3 cluster consisting of 5 nodes, facilitating big data processing and analysis.
• ●  Integrated HIVE and SquirrelSQL via Thrift2/JDBC to enable seamless interaction with the Hadoop ecosystem, empowering Data
  Scientists to extract insights efficiently.

● Pioneered various data intake pathways optimized for long-distance and high-latency scenarios, ensuring robust data acquisition
across diverse environments.
● Provided expert support to the team in executing Extract, Transform, Load (ETL) business processes, optimizing data workflows
for enhanced efficiency and accuracy.

●  Held the role of Chief Troubleshooter with a direct reporting line to CTO Ronny Rentner.
●  Demonstrated expertise in troubleshooting various technology stacks, ranging from patching on PHP / Zend Framework and SQL
profiling, to debugging Couchbase, Nginx, and PHP-FPM, along with 3rd party Java servlets.

• ●  Led capacity testing, deployment automation, and continuous delivery initiatives to enhance system efficiency and reliability.
• ●  Designed a high-latency tolerant file transfer solution utilizing stunnel+rsyncd, tailored to address challenges encountered in South
  East Asia based ventures.

● Orchestrated bug fixing efforts to address recurring issues across fork-based code handling for 300 ventures, ensuring smooth
operation and minimal disruptions.

●  Spearheaded the development of eBook reading technology, specializing in Adobe DRM-related technologies
●  Conducted REST API user acceptance and load & performance testing
●  Led emergency and root cause analysis efforts during critical incidents
●  Implemented operational monitoring strategies to ensure system stability and performance
●  Proficient in coding with Python, Ruby, C++, and Java
Additional Contributions:
●  Developed a Ruby-based test automation solution utilizing Cucumber and Selenium frameworks
●  Engineered an XML, XPATH, and XQUERY search engine for efficient data retrieval
●  Spearheaded a proof of concept initiative involving Hadoop technology
●  Executed CDN and RUM testing, leveraging JMX-based instrumented metrics for performance assessment
●  Facilitated code reviews to ensure code quality and adherence to best practices
●  Oversaw reporting and coordination activities for a team of 3 UAT engineers

●  Implemented a Debian-based KVM private cloud solution
●  Served as Deputy Operations Team Lead, overseeing a team of 6 engineers
●  Conducted software packaging activities
●  Proficient in Python scripting and experienced in configuration management tools such as bcfg2 and Puppet
●  Managed monitoring and backup operations effectively

●  Supporting 7 different teams related to Nokia Maps / NAVTEQ in a DevOps capacity
●  Setting up continuous integration processes
●  Packaging for REDHAT/CentOS systems
●  Scripting in Python and Ruby, and utilizing configuration management tools like Puppet
●  Handling operations related to development data centers.

●  Assisted in teaching network socket programming on GNU/Linux systems at Politecnico di Milano as a Teaching Assistant.
●  Managed system administration duties for GNU/Linux systems, including Suse, Debian, Yellowdog, RedHat, and Mandrake distributions.
●  Contributed as a Frontend Developer, utilizing Macromedia tooling suites to enhance user interfaces.
●  Led a team responsible for developing ECDL Libreoffice simulations, overseeing a team of three.
●  Executed PLSQL migration from Solaris to Linux within banking premises.
●  Conducted security auditing on behalf of a telecommunications company.
●  Engaged in embedded software development, focusing on Linux-based firewall solutions and QT development.
●  Designed and developed PHP applications to meet specific project requirements.
●  Actively contributed to OpenLDAP, Kerberos, and PKCS#12 protocols as part of the OpenGroupware - Gosa^2 project.
●  Developed XML-based databases and implemented full-text retrieval systems, integrating with Openoffice document merging
functionalities.