Maciej Sawicki

Experiences

Managing and maintaining infrastructure of over 200 bare metal servers from various vendors (OVH, Hetzner, Leaseweb)
Participating in on-call rotation to ensure high availability and performance of our services
Using infrastructure as code tools (Terraform, Ansible)
Managing and maintaining Kubernetes clusters (GKE and bare metal)
Troubleshooting and resolve issues in our public cloud environments (GCP and AWS)
Developing and maintaining CI/CD pipelines using GitHub Actions and Cloud Build
Managing HashiCorp Vault for secure access to secrets and systems
Leading the migration to SSH certificates and perform IAM audits

Managing DevOps/SRE team
Debugging production issues (Java-based stack)
Assuring system availability (thousands of request per second, 9 points of presence, hybrid cloud - GCP, AWS, Azure, on premises)
Improving monitoring system (Prometheus, Grafana/Zabbix)
Improving Ci System implementation (GitLab CI, Jenkins)
Improving deployment scripts (Terraform, Ansible)
Security hardening
Release management

Bootstrapped development infrastructure for Open Source Technology Center (Open Telecom Cloud)
Helping define and improve Software Development Life Cycle
Maintaining Continuous Integration environment (GitLab, GitLab CI)
Implementing automated security vulnerabilities and Intellectual Property compliance scans
Building on premises lab for physical hardware testing

Work on a multi-cloud project helping data scientists and ML experts work more effective.

Managing and mentoring data center operations team
Building, improving and documenting projects infrastructure (networks and systems)
Managing vendors and integrations
Developing, documenting, and implementing standard operating procedures
Defining IT policies, technical standards and methods
Ensuring Service Level Agreement accuracy compliance
Helping colleagues with complex and simple technical issues
Promoting knowledge sharing and DevOps culture

Planning and executing hardware and software deployments (including Cisco and Juniper network equipment, VMware clusters, Open Stack cluster and software developed for clients - SDN and BigData platforms)
Automating common tasks (using Ansible Configuration management software)
Planning and executing software updates
Configuring network devices according to project needs, securing infrastructure (managing Palo Alto Networks Firewalls, tracing security vulnerabilities database, responding to abuse notifications)
Continuous Integration server administration (Jenkins)
Bug tracking software administration (Jira)

Managing internal IT infrastructure (Proxmox cluster, Ubuntu and Mac OS X servers, network - MikroTik, UniFi APs)
Developing, improving and administrating internal continuous integration and continuous delivery solutions (Jenkins, Gradle)
Hardening back end apps and production deployments so they ware secure and high available (Python, AWS, Heroku, Nginx, PostgreSQL)
Building DevOps culture - organizing tech talks, working closely with dev teams on improving company's testing, releasing and deploying strategies

Organizing awesome events/conferences for everyone who develops (wants to develop) software using Google's technologies (Android, AppEngine, Chrome, etc).

Skills

SRE, Cloud Architect, GCP and Kubernetes Trainer, Infrastructure Gardener