SUMMARY
Certified and industrial DevOps / Data Engineer with 16 years of experience in banking and energy environments. Strong background in Kafka, Apache Flink, ClickHouse, Kubernetes, CI/CD, and observability. Hands-on experience running high-load streaming systems, supporting real-time data pipelines, and keeping production platforms stable, scalable, and reliable..
PROFESSIONAL EXPERIENCE
Lead DevOps Engineer / Big Data Engineer Dec 2024 – Present
Sberbank
Operate large-scale real-time data infrastructure in a banking environment with a strong focus on reliability, scalability, and observability.
Work with Kafka, ZooKeeper, Apache Flink, and ClickHouse as part of a high-throughput production data platform.
Support streaming pipelines processing more than 8 million events per second for fraud analytics and related data workloads.
Run and support a high-availability ClickHouse cluster of 150 servers and 5 PB, integrated with the wider streaming platform.
Build and maintain CI/CD pipelines with Jenkins, Groovy, Git, and Ansible for release delivery and operational changes.
Use Prometheus, Grafana, and ELK to monitor cluster health, troubleshoot issues, and improve visibility across the platform.
Automate operational tasks with Python and Shell, reducing manual work and improving response time.
Administer a large OpenShift environment across two data centers, improving deployment workflows and platform visibility.
System Administrator Oct 2013 - Dec 2024
GEH TER (Energy Trading)
Supported enterprise integration and infrastructure platforms in a high-availability environment.
Worked with PostgreSQL and infrastructure monitoring tools to improve operational stability.
Maintained monitoring and alerting in Zabbix to improve visibility and incident response.
Automated configuration and operational tasks with Ansible, reducing manual effort and increasing consistency.
System Administrator Dec 2008 - Oct 2013
TER-Novomicurinsk (Energy Trading)
Developed projects for the evolution of networks of 7 remote offices of the company by implementing new hybrid technologies Wi-Fi, VPN, WAN, LAN to increase network speed by 16 times and reduce the number of service denials.
Established Network Attached Storage (NAS) using software customization and project management skills to achieve industrial reliability storage and integration with existing business applications of 9 TB of enterprise data by implementing 3 additional Geo-distributed file servers.
Designed, managed and supported complex IT/OT environments including routing, switching, DNS, voice, wireless, security and load balancing platforms and technologies to ensure industrial performance and security.
EDUCATION
Ryazan College of Electronics | Ryazan, Russia 2002-2006
Degree: College Diploma (three years) GPA: 3.76 / 4.00
Major: Computer Systems and Networks Maintenance Technology (diploma with distinction)
Language Skills: • English – Fluent, • Czech – Intermediate • Russian – Native
TECHNOLOGICAL SKILLS
• Linux Windows Servers • Active Directory • Information Security • Exchange Server • Networking • Technical Support • Virtualization • Hardware • Cloud services • Firewalls
Streaming & Data: Apache Kafka, Apache Flink, ClickHouse, ZooKeeper, PostgreSQL Platform & Containers: Kubernetes, OpenShift, Docker, Istio Observability: Prometheus, Grafana, Zabbix, ELK Stack Automation & CI/CD: Jenkins, Groovy, Git, Ansible, GitHub Actions, AWS CodePipeline Programming: Python, Bash / Shell, JavaScript, PHP Cloud & Infrastructure: AWS, GCP, Linux, bare-metal and hybrid environments
SOFT SKILLS
• Project management • Problem-solving • Communication • Risk management • Teamwork • Determination • Mentoring
SELECTED CERTIFICATIONS & PROFESSIONAL DEVELOPMENT
ClickHouse Database Professional — ClickHouse (Apr 2026)
ClickHouse Data Warehousing Professional — ClickHouse (Apr 2026)
chDB Professional — ClickHouse (Apr 2026)
ClickHouse Observability Professional — ClickHouse (Apr 2026)
Advanced Kubernetes Operators — IBM (Apr 2025)
Containers & Kubernetes Essentials — IBM (Sep 2024)
Simplifying Data Pipelines with Apache Kafka — IBM (Dec 2024)
Python Essentials 2 — Cisco (Mar 2025)
Python for Data Science — IBM (Feb 2025)
AWS Knowledge: Architecting — Amazon Web Services (Aug 2024)
AWS Knowledge: Cloud Essentials — Amazon Web Services (Jul 2024)
| Full certificate list | Credly | Microsoft |
ACADEMIC CREDENTIALS
International Academic Qualifications, Certificate WES #6038574IMM Oct 2023
Issued by World Education Services (WES) - Toronto, Canada
International English Language Testing System (IELTS), Certificate #23TR506632KOZS002G Feb 2024
Issued by British Council - Istanbul, Turkey
Fire safety measures for managers, Aug 2022
Issued by Personnel training center in the energy sector - Moscow, Russia
VOLUNTEER WORK
Over the past 3 years, trained 7 student programmers for various industries as a mentor. All students successfully completed their studies and received diplomas.
EMPLOYEE REVIEW
I am attaching a link to an employee review from my employer, but please note that my colleagues do not speak English: employee review
CONTACT
Given the time difference, please let me know the time of your call
- email: hello@sergeykozlov.ru
- https://www.linkedin.com/in/sergeykozlovru
- https://www.credly.com/users/sergei-kozlov
- https://learn.microsoft.com/users/sergeykozlov
- https://stackoverflow.com/users/1895392/sergey-kozlov
- https://github.com/SergeyKozlov
- https://gitlab.com/SergeyKozlov