Arkadiusz Sieczak
Passionate about infrastructure automation, cloud technologies, and blockchain innovation. 8+ years of building scalable, reliable systems.
Complex infrastructure, made automated and reliable.
DevOps Engineer with 8+ years turning complex infrastructure into automated, reliable systems — from bare metal to GKE. Passionate about open-source, with a research background in blockchain and cybersecurity.
Professional skills
Work experience
DevOps Engineer
May 2024 — Present- Deploying and maintaining applications on OpenShift, Kubernetes and GKE clusters
- Creating automation scripts for deployment and configuration management using GitLab CI and Bash
- Member of the central DevOps team at the largest bank in Poland
- Promoting and enforcing DevOps best practices across teams and projects
DevOps Engineer
Jan 2021 — Apr 2024- Administering on-premises Kubernetes clusters, including upgrades and day-to-day operations
- Operating and maintaining large-scale ELK clusters on Kubernetes (~190 TB of data)
- Implementing GitOps workflows and application delivery pipelines using Argo CD
- Managing and hardening Linux systems (primarily Ubuntu) in production
- Developing automation tools and scripts using Python and Bash
- PostgreSQL database administration and optimization
- Designing and maintaining Ansible roles and playbooks for system configuration
- Monitoring infrastructure and applications using Prometheus Operator and Grafana
IT Systems Maintenance Specialist
Jul 2020 — Jan 2021- Leading the initiative to rebuild and enhance the existing ELK cluster infrastructure
- Administering and optimizing ELK clusters for performance, stability and scalability
- Designing and maintaining external monitoring clusters for critical environments
- Managing and securing Linux environments (primarily CentOS)
- Troubleshooting complex issues and ensuring high system availability
- Developing automation scripts using Python and Bash
- Creating and maintaining Ansible playbooks for configuration and deployment
- Maintaining and supporting CRM systems in production
Junior IT Systems Maintenance Specialist
Jun 2018 — Jul 2020- Maintaining and enhancing ELK clusters, including performance tuning
- Administering Linux systems (CentOS and RHEL) in enterprise environments
- Monitoring services and infrastructure using OP5 and Grafana
- Resolving internal client issues and service requests through JIRA
- Providing maintenance and technical support for CRM systems
- Collaborating with vendors and Technical Project Leads on infrastructure improvements
Certificates
Observability with Prometheus — PromQL, metric instrumentation, alerting and monitoring of cloud-native systems.
View credentialInfrastructure as code with Terraform — core workflows, state management, modules and provider integrations.
View credentialManaging OpenShift clusters, deploying containerized applications, and ensuring platform security and reliability.
View credentialEducation
Master's Degree, Blockchain Technology in Business
Blockchain applications for business processes and cybersecurity. Thesis on implementing blockchain solutions for enhanced cybersecurity frameworks.
Engineer's Degree, Electronics & Telecommunication
Electronics, telecommunications and computer systems, with a strong foundation in system architecture and network technologies.
Get in touch
Open to conversations about platform engineering, Kubernetes and automation.