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Viktor Kosinov

@viktorkosinov

DevOps Engineer at Welltory supporting a production platform; previously cut EC2 costs by 20–25% at Digital Finance International (Infinto).

Vietnam

Message

At Welltory, I support an internal platform hosted on Railway, troubleshooting deployments, production configuration, and PostgreSQL operations. I also investigate access issues and coordinate safe handling and rotation of application secrets and database credentials.

At Digital Finance International (Infinto), I maintained production infrastructure across AWS, Amazon EKS, and DigitalOcean. I reduced EC2 costs by 20–25% through utilization analysis and right-sizing, and PostgreSQL replica infrastructure costs by approximately 50%; I also built cf-logpush-listener to forward Cloudflare Logpush events to OpenSearch.

Experience

Work history, roles, and key accomplishments

Current

DevOps Engineer

Current

Welltory

Jun 2026 - Present (5 months)

Support an internal platform hosted on Railway, including application deployment troubleshooting, production configuration, and PostgreSQL operational tasks. Investigate deployment and access issues and coordinate safe handling of application secrets and database credentials.

Railway PostgreSQL GitHub Production Issue Diagnosis Secrets Management

DevOps Engineer

Digital Finance International (Infinto)

Mar 2019 - Apr 2026 (7 years 1 month)

Maintained production infrastructure for an international fintech platform across multiple environments, including approximately 150 EC2 instances, Amazon EKS, and DigitalOcean. Automated AWS and Cloudflare infrastructure with Terraform, used Ansible for configuration, and built GitLab CI/CD workflows.

Linux / Web Systems Administrator

Fast-Ru

Feb 2012 - Feb 2019 (7 years)

Administered Linux servers and high-traffic web infrastructure using Nginx, PHP-FPM, Memcached, MySQL/PostgreSQL, KVM, Ceph, Zabbix, and Ansible. Started in hosting technical support before moving to the Linux systems administration team.