Олег

OLEH KLIMOV
Senior IT & Telecom Engineer | VoIP/SIP | Monitoring | Automation | AI-assisted Engineering
Kyiv, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація»)
[відкрити контакти](див. вище в блоці «контактна інформація»)
ROLE TARGET
Senior IT & Telecom Engineer
CORE FOCUS
VoIP/SIP, Monitoring, Automation
AI POSITIONING
AI-assisted engineering workflows
LOCATION
Kyiv / Remote / Relocation-ready
PROFESSIONAL PROFILE
Senior IT & Telecom Engineer with hands-on experience in voice infrastructure, SIP platforms, Linux systems, monitoring, and internal automation. I combine telecommunications engineering with practical software development: PBX provisioning workflows, monitoring templates, reporting dashboards, data import/export utilities, JSON/XML integrations, and operational web tools. I use AI-assisted engineering for code review, config/log analysis, documentation, SQL/Bash/PHP/Ansible prototyping and deployment checklists, with human validation before use.
POSITIONING
Telecom
Asterisk, Kamailio/OpenSIPS, SIP/RTP/SDP, routing, PBX/IVR/queues
Monitoring
Zabbix, OpenNMS, SNMP, LLD, triggers, dashboards, operational metrics
Automation
PHP/MySQL, Bash, Go/C, JSON/XML/CSV, REST-style integrations, reports
AI-assisted
AI assistance for code, config/log analysis, docs and troubleshooting; human-reviewed
SELECTED IMPACT HIGHLIGHTS
AI-assisted engineering: Use AI-assisted workflows for code/script drafts, log/config analysis, documentation, troubleshooting notes and deployment checklists - with human review against real infrastructure.
VoIP automation: Develop automated PBX control tools and provisioning workflows for configuration management and operational support.
Critical telecom migration: Reprogrammed and migrated over 100 substations in a 330kV-750kV dispatching telecom environment.
Monitoring engineering: Built and tuned Zabbix/OpenNMS monitoring: templates, LLD scripts, triggers, dashboards, SNMP discovery, and operational metrics.
Internal development: Created PHP/MySQL tools for subscriber/SIM data, reporting, analytics, mass imports/exports, and JSON/XML processing.
SIP troubleshooting: Analyzed SIP/RTP/SDP call flows using logs, packet traces, sngrep and Wireshark to isolate signaling, routing and media-path issues.
WORK EXPERIENCE
Senior Systems Support Engineer | PJSC “Ukrposhta” | 29.11.2024 - Present
Develop and support automated PBX control tools and provisioning workflows for VoIP configuration management.
Build internal automation tools and dashboards using PHP, MySQL, JSON/XML parsing, and web interfaces.
Support SIP/VoIP infrastructure, PBX routing, monitoring data collection, logs, and operational troubleshooting.
Apply AI-assisted workflows for documentation, scripts, SQL/PHP/Bash debugging, config/log analysis and deployment checklists, with validation against actual system behavior.
Chief Communication System Administrator | NEC “Ukrenergo” | 24.02.2021 - 28.11.2024
Participated in the development and implementation of a new Dispatching Telecommunication System (DTS).
Reprogrammed and migrated over 100 substations ranging from 330kV to 750kV.
Maintained critical communication systems in high-risk conditions, supporting stability and operational continuity.
Coordinated technical changes, documentation, troubleshooting, and operational support for mission-critical communication infrastructure.
Head of Telecommunications and Communications Department | PJSC “Ukrposhta” | 01.06.2017 - 16.02.2021
Led telecommunications and communication operations for the Central Office environment.
Took part in the creation of a new contact center and implemented new DTS features.
Managed PBX/telephony administration tasks, call routing, IVR logic, queues, subscriber support, and operational changes.

TECHNICAL STACK
VoIP & Telephony
Asterisk; Kamailio; OpenSIPS; SIP/RTP/SDP analysis; sngrep; Wireshark; IVR; call routing; queues; PSTN/FXO/FXS; DSS1/EDSS1
Monitoring
Zabbix; OpenNMS; SNMP monitoring; network discovery; custom LLD scripts; macros; triggers; templates; dashboards; alert tuning
Automation & Code
PHP; Bash; C; Go; JSON/XML/CSV parsing; HTML/CSS; REST/JSON-style integrations; crontab; systemd; log analysis; reporting automation
AI-assisted Workflows
AI-assisted code drafting/review; config and log analysis; documentation; test cases; changelogs; README updates; anonymized troubleshooting; human validation
Databases & Data
MariaDB/MySQL backup, optimization and queries; basic PostgreSQL; large data processing; mass import/export; structured reporting
Systems & Network
Linux: Debian, Ubuntu, CentOS; FreeBSD; TCP/IP; DNS; DHCP; iptables; firewalld; pfSense; VPN; SSH tunneling; RDP
DevOps & Hosting
Git; GitLab CI/CD pipelines; repository mirroring; Ansible; Apache2; Nginx; Certbot/Let’s Encrypt; local DNS; NAT and port-forwarding
Security & Access
Linux hardening; fail2ban; sshd_config tuning; ACLs; sudoers; secure backup and transfer via SFTP/LFTP
Documentation
Markdown; reStructuredText; technical documentation; procedures; operational notes; team coordination under pressure
SELECTED PRACTICAL PROJECT AREAS
Telecom automation tools for PBX control, configuration workflows, routing changes, and operational support.
Kamailio/Asterisk-style SIP routing, registration, dispatcher/failover logic, troubleshooting workflows, and monitoring counters.
Monitoring templates, custom data collection scripts, triggers, dashboards, and Zabbix agent integrations for telecom and infrastructure systems.
PHP/MySQL web systems for subscriber/SIM data management, reporting, analytics, and import/export workflows.
GitLab CI/CD and Ansible workflows for controlled deployment, validation, backup, and rollback-oriented changes.
AI-assisted documentation workflow: turning rough notes, configs and logs into structured procedures, README files, checklists and technical summaries, then reviewing them against the real environment.
EDUCATION & CERTIFICATIONS
Degree in Automation of Technological Processes and Production | National Technical University of Ukraine “Kyiv Polytechnic Institute” | 1992 - 1998. Thesis: “Automation of the Water-Steam Path of the TGM-314A Boiler”.
Meridian Nortel Administration Courses | ICS “INKOM” | 2003 - 2004. PBX programming, DSS modules, analog line configuration.
Asterisk Administration Essentials | IT Education Academy Ukraine LLC | 17.02.2021 - 23.02.2021. Certificate of completion.
PROFESSIONAL DIRECTION
Interested in roles focused on telecom/network software development, SIP platforms, monitoring systems, backend automation, operational dashboards, infrastructure data engineering, and practical AI-assisted IT operations. Ukrainian - native; English - technical documentation, improving spoken/written communication.