Sergey Yashchuk Email & Phone Number

Сан-Франциско, Калифорния, Соединенные Штаты Америки

AWS, CloudFormation, Terraform, Ansible, Jenkins, Deploy to ECS/EC2 etc.

Singapore

Scaling high-traffic distributed systems, developing fault tolerant and self-healing systems, define priorities based on system metrics, engineer extensive scripting and automation to enable applications to install and run in all environments with minimal manual intervention, Identify performance bottlenecks and troubleshoot performance issues, design and implement ideas (Architect).- Cloud: AWS (Easier to say what we don't use than provide list of AWS services)- Databases: MySQL, PostgreSQL (RDS), ES, Clickhouse, VictoriaMetrics- Linux: Ubuntu server, CentOS, Amazon Linux- Infrastructure as code: Terraform, Ansible- Containers: Kubernetes (own with EC2) and EKS, Docker- Monitoring and Logging: Prometheus, Grafana, Kibana, Logstash, Redash, Cloudwatch, custom exporters on Go- CI\CD: Slack bot, Github, Codeship, Gitlab, scripts, Helm- Other services: Kafka, Redis, Local environment for developers with Minikube, AWS Mocks- Programming: Python, Go, Bash- Providing information security (VPN, 2FA with hardware keys, Hackerone cases investigation, etc)Achievements:- Introduced Helm usage for deploying, implemented some standard library charts, external utilites, secrets storing to help developers make their charts easier, migrated hundreds apps to Helm- Infrastructure as code - 100% infrastructure resources migrated to Terraform- Bastion server (SSH jump host) with users provisioning on servers - fixes and improvements into open-source upstream, scripts, automation- On off boarding automation - roles, permissions, user accounts creation and delition in almost 20 services

Usa, San Jose

- Administering servers (150+, Ubuntu Server, Squid, Postfix, Apache, Nginx, HAProxy, Docker, Docker Swarm, RabbitMQ, Redis, etc. Backup, VPN\SSH, Firewall (iptables\ipset), Zabbix, Graylog)- DBA: MySQL, PostgreSQL, MongoDB, ElasticSearch, Druid;- Automate the deployment of new servers and services (Ansible);- Automation of work using scripts on Bash, Python;- CI: GitLab;- NodeJS apps deploying and supporting;- Clouds: AWS, MS Azure, DigitalOcean, Google Cloud;- Team management.

Usa, San Jose

- Administering servers (150+, Ubuntu Server, Squid, Postfix, Apache, Nginx, HAProxy, Docker, Docker Swarm, RabbitMQ, Redis, etc. Backup, VPN\SSH, Firewall (iptables\ipset), Zabbix, Graylog)- DBA: MySQL, PostgreSQL, MongoDB, ElasticSearch, Druid;- Automate the deployment of new servers and services (Ansible);- Automation of work using scripts on Bash, Python;- CI: GitLab;- NodeJS apps deploying and supporting;- Clouds: AWS, MS Azure, DigitalOcean.

Казахстан

- Administering servers (CentOS, Postfix, Apache, Nginx, HAProxy, RabbitMQ, Tomcat, etc. Backup, VPN\SSH, Firewall (iptables))- DBA: MySQL, PostgreSQL, VoltDB;- Automate the deployment of new servers and services (Ansible);- Automation of work using scripts on Bash, Perl;- Java apps deploying and supporting;- Virtualization: VMWare vSphere, kvm, Ceph, OpenVSwitch, OpenNebula

Canada

- Administering servers (100+, bonding, megaraid & mdadm, Ubuntu Server, Squid, Postfix, Apache, Nginx, HAProxy, Docker, Backup, VPN\SSH, FTP, Firewall (iptables\ipset), Nagios, Cacti)- MySQL administering (master, slave), MongoDB;- Automate the deployment of new servers and services (Chef);- Automation of work using scripts on Bash, Perl, Ruby, Python;- Wordpress websites administering;- PHP & Perl websites administering, debugging and base development;- Git and Gitolite;- DDoS\Web-bot protection, investigating and protection from websites hacking;- Google SafeBrowsing, Analytics, Webmaster Console, Dynect DNS, Cloudflare services.

Saint Petersburg, Russian Federation

- Administering of applications and services (Solaris, Suse);- Software testing and implementation;- Scripts development (Perl\shell, SQL \ PL\SQL Oracle 11);- Debugging of PL\SQL source codes in Oracle 11;- VB and Java applications debugging;- Root cause analysis via logs, database and source codes, identifying the issues which can cause issue in future;- Users support;- Preparation of technical documentation

Syktyvkar

- Planning Department. Flow of documents;- Negotiating with suppliers, contracts, setting targets and monitoring their performance;- Training and supervision of work staff;- Preparation of organizational and administrative documentation, technical documentation;- Introduction of new software and equipment;- Installation, configuration and maintenance of servers: Debian\RedHat (DHCP, DNS, NAT, Squid, Samba, Postfix, Apache, MySQL, Backup, VPN\SSH, Firewall, Zabbix); Windows 2k3 Server (Oracle 9i, Billing, Terminal Server);- Virtualization VMWare vSphere (ESX 5). Organization failover (Cluster vSphere, VMWare HA, FT, vMotion);- Service billing system m2000 (administration, revision and development of reports FastReports);- Administering and programming for Oracle 9i;- Automation of work using scripts on Shell (bash) and Perl;- Software development on PHP5, JavaScript, ExtJS, jQuery (WEB site for change Billing software);- Administering network equipment D-Link\Cisco L2\L3, Cisco BGP;- Ensuring the protection of information.Achievements:- All physical servers were moved in virtual infrastructure. Implementing the project of the fault tolerance. The backup system configurations of all servers, Billing and business data;- Deployment the monitoring system, monitoring of all network equipment, servers, running services and scripts. Collecting statistics on equipment load, network usage and customers requests for optimizing;- Implementation new service for connecting customers (IPoE: VLAN-per-user, in Billing customers binding to VLAN);- Development WEB-application for easy work with Billing.

Syktyvkar

- Planning Department. Flow of documents;- Training and supervision of work, staff Qualification Supports team;- Preparation of organizational and administrative documentation, technical documentation;- Introduction of new software and equipment;- Installation, configuration and maintenance of servers: Debian\RedHat (DHCP, DNS, NAT, Squid, Samba, Postfix, Apache, MySQL, Backup, VPN\SSH, Firewall); Windows 2k3 Server (Oracle 9i, Billing, Terminal server);- Virtualization VMWare vSphere (ESX 4). Organization failover (Cluster vSphere, VMWare HA, FT, vMotion);- Service billing system m2000 (administration, revision and development of reports FastReports);- Administering Oracle Database 9i;- Ensuring the protection of information.Achievements:- The reorganization of technical support that led to a significant increase in the quality of care;- Automation subscription department. Reducing the time of discharge subscribers and addressing emerging issues;- Aligning IT infrastructure in line with the Law on Protection of Personal Data;- Development of the project to ensure resiliency of critical nodes.

Emva

- Planning Department. Flow of documents;- Planning and organization of purchasing products and software. The introduction of new software and equipment;- Negotiating with suppliers, contracts, setting targets and monitoring their performance;- Preparation of organizational and administrative documentation, technical documentation;- Staff Qualification;- Develop a project to upgrade the network and PC fleet;- Installation, configuration and maintenance of servers: Windows 2k3 Server (AD, DHCP, DNS, GPO, Backup, Printservers, fileserver, MS SQL Server, Terminal Server); Debian and FreeBSD (DNS, DHCP, MySQL, Postfix, Squid, firewall, VPN \ SSH, Apache);- Administration user PC (130 PC);- Administration of local and wireless networks;- Ensuring the protection of information.Achievements:- Increasing the effectiveness of the department - planning, monitoring of working time and automated typical processes;- Reduce costs to the organization in the field of IT (Internet, accessories, consumables) for improving the quality of work.

Syktyvkar

- Administering servers: RedHat, Debian- Job, improvement and maintenance of billing system Bill-Master (MySQL, Perl, HTML-PDF)