Senior DevOps Engineer
Vilnius, Lithuania | aizenberg.co.uk | LinkedIn | GitHub
Email: david@aizenberg.co.uk | Languages: English (Fluent), Russian (Fluent), Lithuanian (Proficient)

Results-driven Senior DevOps Engineer with over ten years of experience bridging infrastructure and development. Successfully architecting both cloud-native and hybrid-cloud solutions, implementing GitOps workflows, and building CI/CD pipelines. Passionate about delivering robust, secure, and scalable infrastructure while enabling development teams to ship high-quality code faster.

• Cloud & Containers: AWS (EKS, EC2, S3, CloudFront, Lambda, VPC, IAM, Route53), Kubernetes, Helm, Docker, LXD
• CI/CD & Automation: GitLab CI/CD, GitHub Actions, Jenkins, ArgoCD, GitOps, Ansible, Python, Shell scripting
• Infrastructure & Observability: Terraform, Infrastructure as Code (IaC), Prometheus, VictoriaMetrics, Grafana, ELK / OpenSearch Stack
• Security & Networking: Vault, mTLS, cert-manager, Network Security, Firewalls, VPN, IAM, Zero Trust
• Development & Databases: Python, Node.js, Bash, MongoDB, Redis, RabbitMQ

Senior DevOps Engineer Cryptocurrency Company | London, UK (Remote) | Dec 2020 – Mar 2025

• Architected Kubernetes Infrastructure: Led a migration to managed Kubernetes Cluster.
• Implemented GitOps Workflow: Decreased deployment times through ArgoCD and Helm-based CI/CD pipelines, enabled developers to enact changes on their dynamic test environments and introduced a written single source of truth to rollback and review configuration changes.
• Optimized Cloud Costs: Established resource usage monitoring and optimization strategies, cutting monthly spend significantly.
• Improved Observability: Built a robust observability platform with VictoriaMetrics, Grafana, and OpenSearch, enhancing system reliability and incident response times.
• Enhanced Security Posture: Established secure coding best practices, dependency pinning, secret management (Vault), private registries, and mTLS.
• Team Leadership & Mentorship: Assisted a 20+ developer team, defining best practices and resolving complex deployment and infrastructure issues.

Software Consultant SecurEdge Networks | Charlotte, NC, USA (Remote) | Apr 2020 – Dec 2020

• Containerized Legacy Apps: Streamlined application deployment and maintenance by designing Docker-based container workflows.
• Developed Python CLI Tools: Automated repetitive tasks, reducing manual effort and speeding up QA cycles.
• Implemented AAA Solutions: Deployed 802.1X, EAP, and RADIUS solutions.

Lead Developer → DevOps Engineer E-Farm GmbH | Hamburg, Germany (Remote) | Feb 2016 – Jan 2020

• Microservices Migration: Transitioned from a monolithic architecture to microservices, improving scalability and system resilience.
• Container & Orchestration Adoption: Deployed and managed Docker containers, eventually leading the introduction of orchestration platforms.
• Performance Optimization: Improved API response times by up to 10x through code refactoring and infrastructure tuning.
• CI/CD Implementation: Designed automated pipelines for building, testing, and deploying applications.
• Monitoring & Logging: Introduced centralized logging (ELK/OpenSearch) and metric gathering (Prometheus/Grafana).

System Administrator UAB JT Company | Visaginas, Lithuania | Jan 2014 – Dec 2014

• Server & Workstation Management: Managed Linux servers and Windows/macOS workstations for 70+ employees.
• Network & Security: Implemented security protocols, firewalls, VPNs, and provided end-to-end network management.
• Hardware Diagnostics: Performed component-level repairs on bespoke and impossible to replace hardware systems.