The best freelancers
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System administration · Software and server configuration
Sumy, Ukraine
Professional system administration. Linux/Unix.
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My Skills and Experience I specialize in and work with various operating systems: Debian Ubuntu RHEL CentOS FreeBSD Windows I work with server hardware: IBM HP ProLiant Dell PowerEdge Supermicro I know how the following software should work: Web: Apache, Nginx, Lighttpd, OpenLiteSpeed Mail: Exim, Postfix, Dovecot FTP: ProFTPd, vsftpd, PureFTPd DNS: BIND, PowerDNS DHCP Gateway: NAT, traffic shaping Proxy: Squid Directory: LDAP AAA: FreeRADIUS VPN: IPsec-based, OpenVPN, PPTP, L2TP TFTP NTP Syslog TLS/SSL SNMP Virtualization: KVM, Xen, VMware ESX, OpenVZ, Proxmox Backup and Restore: RSYNC Revision Control Systems: CVS, SVN, Git File Sharing: NFS, SMB Software-Defined/Network-Based Storages: DRBD, Ceph, iSCSI, AoE Printing Systems: CUPS I am familiar with databases: PostgreSQL MySQL I have experience with monitoring systems: Zabbix Cacti Munin I also work with: Telephony: Asterisk (FreePBX, Elastix, MikoPBX) Routers: Mikrotik, All (Firmware OpenWRT, DD-WRT), hardware repair Billing systems for Internet Service Providers: Abills, Ubilling (building networks from scratch) Billing systems for hosting providers: BillManager, RootPanel, WHMCS Hosting panels: ISPManager, CPANEL, BrainyCP, VestaCP, ISPConfig, aaPanel, HestiaCP PON equipment (ONU, OLT): BDCOM Switches: Mikrotik, D-Link, TP-LINK, Cisco I have extensive experience in these areas. Feel free to reach out to me, I'll answer all your questions!
Please note: I do not engage in website development.
Installing, configuring and maintaining servers.
Frequently serviced services: Apache, Nginx, PHP, MySQL, FTP (vsftpd, proftpd), Mail server (Dovecot+Postfix+Roundcube), SVN/GIT, Asterisk (VoIP/Vicidial), SMS Server for GoIPx gateways, Samba, Internet-Gateway , Squid/Dansguardian, VPN/OpenVPN for accessing internal company resources from outside.
Setting up and working with Elgato SIM bank, Elgato GSM gateways and GoIPx GSM gateways, setting up and maintaining computer client systems and workstations, setting up and maintaining small local networks.
Router settings: Mikrotik, EdgeRouter, Keenetik, Ubiquiti Wi-Fi hotspots
Setting up DVRs and IP cameras: Dahua, Hikvision
DevOps · System administration
Kharkiv, Ukraine
I can manage with anything. If I don't know how to do something, I'll learn and complete it.
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- I am a System Engineer with more than 20 years of extensive experience in systems design,
administration, support including 5 years working as a DevOps Engineer.
- My expertise encompasses effective planning, design, installation, configuration, maintenance, and optimization of IT systems for achieving high availability and performance.
- I am skilled in working with cloud computing platforms such as Amazon Web Services, creating and configuring the infrastructure using IaC tools, and working with CI/CD process and source control tools.
- Additionally, I have experience as a Chief Technology Officer and Head of IT Department with 6 immediate subordinates and general team of 12 employees. It helped me to develop good planning and organizational skills, so I am confident working independently or as part of a team.
- work as an individual entrepreneur.
CLOUDS
- AWS: EC2, IAM, AMI, S3, VPC, SubNets, SecurityGroup, ACL, Routing, NAT GW, InternetGW, BastionHost, VPN, Route53, Lamda, ALB, ELB, Auto Scaling Group, Parameter Store, SNS, SQS, WAF, CloudFront, CodeCommit, Beanstalk, EKS, Kinesis, Redis
OS
FreeBSD, Linux (Ubuntu, CentOS, AWS Linux)
VIRTUALIZATION
Docker, Docker-Compose, Kubernetes ( K8s ), KVM, VMware ESXi
MONITORING
Nagios, Zabbix, Prometheus
MySQL
optimization, clustering (replication setup, configuration, recovering)
IaC, Config control
Terraform, SaltStack, Ansible
Dev auto tools : Jenkins (groovy scripting), GitLab (CI/CD, configuring gitlab-ci.yml)
Version control : Git
Scripting : Bash, Python
NETWORKING
- NET : TCP / IP stack. CARP
- Routing : OSPF, BGP
- CISCO : vlan, trunk, ports aggregation LACP, static routes configuring, acl.
FAILOVER
RAID, link aggregation; redundant channels and STP, net interfaces aggregation, load balancing and traffic distribution at various levels of the OSI model (CARP, BGP, OSPF, Nginx, HProxyServer, CDN GeoDNS)
TELEPHONY
VoIP server Asterisk integrated with PBX (with PRI) PBX - Samsung iDCS 500 (PCMMC OfficeServManager 3.75) programming, cross patching and laying of SCS. Mitel 3300, wifi Mitel phones
SATELLITE & GSM
Seatel ACU, iDirect modem, FB250, Iridium, Internet/telephony/TV via satellite systems and a GSM operator.
Misc
ELK Stack (Kibana), Jira, FireWall (ipfw, pf, iptables), VPN (OpenVPN, mpd5, netgraph), Samba, Postfix, Exim, Apache, Nginx, php-fpm, FTP
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Привет! Linux & VoIP инженер к вашим услугам, всего коммерческий опыт около 4х лет. Занимаюсь администрированием Linux-систем и, немного, разработкой под небольшие задачи. 4 года опыта работы с UNIX-подобными системами (Debian / Ubuntu).
✔️VoIP Telephony services (SIP):
Asterisk, FreePBX IP-PBX platforms
Experience with hardware like GSM, FXO/FXS gateways, PRI modules
Dialplan programming (AEL, LUA)
Asterisk AMI, AGI, ARI interfaces
A little experience with Kamailio
SIP trunking and carriers interconnection
✔️Linux and DevOps:
A power user and administrator of Debian/Ubuntu systems for about 5 years
VPS and Cloud Environments such as Hetzner, Digital Ocean, Vultr, Linode, Rackspace, GCP, AWS (Cloud Practitioner)
Experience with Terraform, Ansible, Puppet, Docker, LXC
Proficient with Proxmox (KVM)
✔️Monitoring:
Experience with Zabbix and Nagios
Prometheus, Grafana, ELK
✔️Software Development
Junior level of PHP, JS, Bash and Python
FrontEnd development (jQuery and React.js)
API development - Node.js (express, koa), Python (flask)
✔️Networking
Feeling comfortable about the most common networking protocols around me
Fell in love with SIP & (S)RTP, DHCP, HTTP(s), DNS, ICMP, WebRTC, STUN, SSH, VRRP and a few others
Proficient with Cloudflare (DNS, firewalling, SSL/TLS)
Experience with Mikrotik hardware (on my path to MTCNA now)
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