Sebastian Vaisov Email & Phone Number

Valencian Community, Spain

London, England, Gb

Bringing Fintech to the new heights!

Vilnius, Lt

• Strategic Product Development: Collaborated with clients for requirements gathering. Directed user-friendly feature development, improving usability and performance. Vetted and outsourced to development agencies.• Stakeholder Engagement: Supported CEO in investor pitches. Achieved GDPR compliance, enhancing platform trustworthiness.• Technical Leadership: Mentored and coached 6-member team, building skills, engagement, motivation, and high-performing workforce.• Infrastructure Management: Secured and optimized infrastructure for the platform and internal tools on AWS, leveraging services like EKS, RDS, SQS, Auth0, Sentry, Grafana/Prometheus and others.• Operational Excellence: Managed daily operations with a balanced approach, emphasizing productivity, accountability, and team well-being to prevent burnout, resulting in a motivated and efficient team.

Gibraltar, Gibraltar, Gi

• Team Building & Agile Transformation: Expanded DevOps team from 1 to 7 members within a year. Implemented Agile workflows, enhancing team dynamics, happiness and productivity.• Strategic Leadership & Coaching: Guided infrastructure planning, tool integration, and coached team using neuroscience principles, fostering technical and personal growth.• Process Optimization: Developed roadmap focused on team well-being and company goals. Streamlined communication and deployment processes, boosting overall efficiency.• Stakeholder Management & Technical Support: Organized and led stakeholder meetings and provided hands-on support across Kubernetes, GitLab, TimescaleDB, Postgres, NATS, Vault, Terraform, Packer, Ansible, and other tech.

Gibraltar, Gibraltar, Gi

• Infrastructure Optimization: Stabilized legacy ELK cluster for high availability and resilience. Resolved Kubernetes storage challenges and implemented HA solutions.• Automation & Streamlining: Automated cloud management and node bootstrapping with Ansible and Terraform. Implemented GitLab pipelines for optimized infrastructure management and deployment.• Security Enhancement: Secured existing infrastructure based on security best practices, safeguarding against vulnerabilities and threats.• Tech Stack Management: Managed diverse technologies including Kubernetes, Elasticsearch, Prometheus, Grafana, Opsgenie, GitLab, Terraform, Ansible, Nomad, TimescaleDB, Postgres, and multiple cloud platforms (AWS, Azure, GCP, Hetzner, OCI, Vultr, DigitalOcean and 100+ others clouds and hosting providers).• Technical Expertise: Demonstrated proficiency in systems, networking, troubleshooting, VPN, load balancing, security, and incident management for robust performance and reliability.• Cloud Automation Excellence: Automated VM and bare-metal server bootstrapping across 100+ clouds and hosting providers, enhancing deployment efficiency and scalability.

• System Architecture Design: Designed system infrastructure architecture tailored to meet specific requirements.• Automation and Deployment: Automated servers and services deployment utilizing Ansible.

Walnut, California, Us

• Cloud Migration: Helped the team with migration of microservices and data from GCP to AWS.• Monitoring Architecture: Architected and implemented dockerized TICK stack for monitoring, including automated Chronograf and Grafana setup using TeamCity and Docker.• AWS Infrastructure Automation: Automated infrastructure deployment to AWS using Terraform/Terragrunt, Chef, and TeamCity.

Copenhagen, Capital Region Of Denmark, Dk

• Zero-Downtime Upgrades: Accomplished zero-downtime upgrades of ELK and Kafka clusters on Kubernetes.• Optimization and Scaling: Enhanced ELK and Kafka statefulsets for improved efficiency and stability. Managed and scaled multiple Kubernetes clusters for robust infrastructure.• Strategic Consultancy: Provided expert advice on infrastructure scaling, growth, and cost optimization, guiding strategic decisions.• Kubernetes Management: Improved Helm templates for streamlined cluster management. Specialized in ELK and Kafka architecture, setup, optimization, and maintenance on Kubernetes.• Infrastructure Automation: Managed infrastructure creation and maintenance using Terraform and Ansible for efficient and reliable systems

Vilnius, Vilniaus, Lt

• Containerization and Cloud Migration: Led dockerization and migration of Python/PHP apps to highly scalable 200+ node Kubernetes clusters on multiple clouds.• Infrastructure Overhaul: Implemented robust security, high-availability, auto-recovery, backups, and cost optimizations to elevate existing infrastructure reliability and efficiency.• Resource and Team Management: Optimized cloud resources across Hetzner and AWS. Headed and mentored a 3-member DevOps team for major projects.• Kubernetes and Database Specialization: Managed advanced HA Kubernetes setups with Istio and Rancher. Optimized Couchbase, RabbitMQ, Redis, MongoDB for high availability, sharding, and performance.• Automation, Monitoring, and Documentation: Deployed Ansible, GitLab for CI/CD automation, and Nagios, Graylog for monitoring/logging. Created detailed procedure documentation for streamlined operations.• MySQL high availability implementation: Implemented MySQL replication and high-availability solution.• Performance troubleshooting: Skilled in identifying and resolving complex performance issues, maintaining high system reliability.

Berlin, Berlin, De

• Systems Updates and Automation: Designed and automated package updates using Python/Confluence. Utilized Chef, SaltStack, and scripting (Bash, Python) for automating daily tasks, custom backup solutions, and infrastructure setup/configuration management. Developed custom Nagios plugins.• Cloud, Database, and Server Administration: Managed VMs (Ubuntu, CentOS, VyOS), databases (Postgres, MySQL), mail servers (Postfix, Amavis), web servers (Apache, Nginx, Uwsgi) across ProfitBricks, Hetzner, AWS. Administered database setup, replication, maintenance, and optimal performance.• Infrastructure Monitoring Migration: Led migration from Icinga to Icinga2 for improved monitoring capabilities and system reliability.• Robust Monitoring and High Availability: Deployed Icinga/Nagios, Munin, Splunk for comprehensive monitoring. Administered RabbitMQ, GlusterFS, Memcached, Redis for high availability and caching.• System Security, On-Call and Troubleshooting: Configured network security with IPTables, Vyatta. Skilled in troubleshooting, debugging performance issues, and maintaining system stability. Provided on-call support and incident resolution.

• Pfsense, Munin, SolusVM, Plesk, Blesta setup, maintenance• VPS, Shared hosting customer support, troubleshooting

Vilnius, Vilniaus, Lt

• Atlassian Confluence Implementation: Designed, planned, and implemented the setup and maintenance of Atlassian Confluence company-wide.• Server and Application Management: Managed deployment and maintenance of IBM WebSphere servers, JAVA applications, and Tomcat. Handled MQ messages and queues.• On-Call Support: Provided on-call duty support and incident management.

Vilnius, Vilniaus, Lt

• Virtualization and Cloud Migration: Led migration of physical servers to OpenVZ virtual environment for improved efficiency and scalability. Handled setup and maintenance of AWS EC2 cloud instances.• Network and Security Management: Implemented and maintained Fortigate firewall, IPSEC/PPTP VPN setups for robust network security. Configured network protection measures.• Server Administration: Managed CentOS, Debian Linux, and Windows Server 2003/2008 instances. Handled installation, configuration, maintenance across physical and virtual environments.• Web, Database, and Monitoring Systems: Optimized Apache web and MySQL servers. Installed and configured Oracle DB, MSSQL, PostgreSQL with backup setups. Deployed and maintained Big Brother monitoring system and Jira for issue tracking.• End-User Support: Provided installation, configuration, maintenance for Windows workstations and PC hardware as part of local helpdesk duties. Delivered on-call technical support for critical system issues.

• Conducted basic configuration of Linux servers, ensuring operational efficiency.• Provided helpdesk support via phone and email, resolving hosting and email-related issues.• Set up networks for small office environments, ensuring reliable and efficient connectivity.