Sergei Grenivetckii

Urent is a kicksharing and power bank sharing service.

Managing the DevOps team, SRE team, and Cloud Engineers helps improve incident management and stability

Hands-on experience:
- Yandex Cloud (Managed Kubernetes, LB, VPC, s3) managed by terraform
- Kubernetes (helm, helmfile, Argo rollouts, ArgoCD)
- victoriametrics
- ingress-nginx
- redis-sentinel, keydb
- rabbitmq, kafka
- elk / apm
- vault
- gitlab + gitlab-ci
- mongodb
- dwh stack (airflow, dbt, Clickhouse)

Results:
Incident count decreased- x8 - Y2Y
Cost Effective - 30% - Y2Y

YouDo is c2c service

Managing of IT Infrastructure (DevOps & SE) and B2B development; I combine 2 roles - Head of Infrastructure and Head of Engineering. Leading more than 20 technical specialists, direct reports - 4 (managers);

Main activity:
- Strategic planning;
- Building an organizational structure and processes, personal development of team leaders and managers;
- Setting up processes in an engineering team (Agile, incident management, technical works, duties, etc.);
- Setting up HR processes in collaboration with HRD: performance reviews, 1to1 meetings, introduction in and support of the company's value system to engineering/infrastructure teams;
- Validation of value indicators, drawing up a description of requirements for grades (hard- / soft-skills);
- Setting up OKRs for department managers;
- Managing the annual operating budget;
- Selection and organization of outstaff team work - QA, Backend, Frontend, etc;
- Infrastructure development;

Citymobil is Russian Uber.
Managing of DevOps/SRE, SE departments, Help Desk, VOIP support; Leading more than 55 technical specialists, direct reports - 5 (managers);
Main activity:
- Strategic planning of infrastructure development, technical support;
- Direct interaction with Heads of engineering;
- Bringing up new technologies to stack; Increasing technical expertise in teams;
- Setting up processes in an engineering team (Agile, incident management, technical works, duties, etc.);
- Building the organizational structure, leading, supporting and mentoring of Engineering Managers and Tech Leads to be more effective leaders;
- Setting up OKRs for department managers;
- Implementation of the practice of calculating SLO/SLI/SLA;
- Implementation of SRE practices in SE and SWE teams;
- Responsibility for uptime and infrastructure stability;
- Searching for and eliminating points of failure both within the infrastructure and in architectural solutions;
- System troubleshooting and problem-solving across platform and application domains (creating of task force, leading the process) - for example, errors in the Redis-client library, application resolution errors, errors in the network stack, post-incident cases;
- Participation in audits (Deloitte);
- Participation in acquisitions of third-party companies: CityDrive (ex-YouDrive), Proil;
- Working independently and with little direct CTO supervision;
- Management of the annual IT infrastructure budget (~ $15mm).

ATOL is company which provide online receipt services and retail products

Managing the Infrastructure Department (DevOps & Infra); Leading more than 12 technical specialists, direct reports - 4 (managers);
Main activity:
I was responsible for the operation of all business units in the Group of Companies: - Server and network equipment in 4 data centers;
- Implementation of advanced DevOps/SRE / OPS practices;
- Infrastructure as a code;
- Information security;
- Formation of teams in-directions;
- CAPEX, OPEX for IT;
- Implementation of modern SRE/DevOps practices and customer-oriented operation in ATOL Group;

Leading more than 10 technical specialists, direct reports - 2 (managers);
Main activity:
- Creating and implementing a RoadMAP (DevOps, infrastructure, SRE); - Division of operation into 3 areas (SRE, infrastructure, DevOps);
- Implementation of Agile processes;
- Providing the ability to live cross-dc;
- Building a hybrid cloud based on Opennebula;
- Implementation of ELK, Prometheus, SaltStack;
- Building a Hadoop cluster;
- Implementation of the Docker container orchestrator.

CIAN is NASDAQ listed company which helps to find property.
I worked in the following areas within the System Administration group:
- Quarterly planning and formation of tasks for sprints;
- Infrastructure (Implementation of the Salstack orchestrator, Improvement of SLI, SLA, Assistance in sawing the monolith and transferring it to a microservice architecture);
- Hadoop (Hortonworks hadoop cluster, Improving cluster stability and fault tolerance, monitoring, backup);
- Balancers (Fault tolerance of balancers, latency reduction, caching, balancing, working with
AntiDDoS providers);
- Monitoring (Prometheus-component software implementation, alerting, ELK-deploying and collecting logs from balancers, applications. Building visualizations and alerts based on data from ELK); - ElasticSearch5 (cluster support, fault tolerance, sharding, monitoring);
- Cassandra (problem solving, migration of cases to small clusters, implementation of flow for rolling migrations, monitoring);
- Docker (Nomad, Consul, Consul-template, cluster support, monitoring, problem solving).
We raised the SLA from 90% to 99.9%.

Rambler is first search engine company in Russia.

I was in charge of the operation group with 4 reporting employees.
Main activity:
- Training, motivation, recruitment of employees, ensuring interchangeability, the guys of the group have gone from system administrators to DevOps;
- Administration of FreeBSD/Linux services (Home, Search, News, Comments, Payment system, more than 15 projects in total);
- Implementation of SaltStack in all groups of operation, justification of implementation, training; - Changed operating systems from FreeBSD to Linux in 2 quarters;
- Resource optimization, actively eliminated Legacy, released more than 200 servers;
- Unification of assemblies in Docker, implementation of CI / CD processes from scratch based on gitlabci + rpm + salt-api;
- Administration of Hadoop clusters (Search, TOP-100) and accompanying pipelines for log delivery to HDFS;
- Forming requirements for services living in the infrastructure;
- Was involved in the purchase of new third-party projects, evaluated integration into the infrastructure, deployed ready-made applications/prototypes;
- Working with development team leaders and ordinary developers, developing solutions for deployment, support, and incident analysis;
- Launched 3 services in production based on Docker.
I formed the best operation group in Rambler&co, which went from system administration to DevOps.

• - Full circle of administration project Tvbreak
• - Site, Mobile (IOS, Android), SmartTV;
• - Installing and administering Jira+Confluence;
• - Oracle Linux 7.x, Centos 7.x, Ubuntu;
• - Virtualizations: VmWare ESX, KVM;
• - Haproxy, Tengine(nginx), Varnish, MariaDB, php, memcached
• - SAN: IBM DS-3512;
• - FibreChannel, OCFS2, Luminato, CDN providers;

• - Administration news portal km.ru (> 2-4 mln Visitors per month) - KVM, Haproxy, Lighttpd, Nginx, PHP-FPM, MariaDB, Varnish, Memcached;
• - Administration magazine hardnsoft.ru - Bitrix Virtual Machine
• - Mail Service corp.km.ru
• - Mail project mail.km.ru - Lighttpd, PHP-FPM, MariaDB, MongoDB