Дмитро

Dmytro Krainiak
TechOps Engineer → DevOps | Linux | Docker | CI/CD | Networking | AWS

Location: Ukraine | Email: [відкрити контакти](див. вище в блоці «контактна інформація») | Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)| GitHub: https://github.com/deemon-k

Professional Summary

TechOps professional transitioning into DevOps, with 5 years of experience supporting Linux
systems, networking infrastructure, APIs, telephony, and operational automation. Strong
foundation in Linux, Bash scripting, Git, Docker, Ansible, CI/CD, and AWS cloud networking.
Backed by a software development background in Node.js and PostgreSQL, providing a clear
understanding of the full software development lifecycle. Focused on growing expertise in
Kubernetes, Infrastructure as Code, observability, and automated delivery pipelines.

Technical Skills

DevOps & Cloud: Git, Docker, Docker Compose, Ansible, Jenkins, CI/CD, AWS (EC2,
VPC, Security Groups), Terraform (Basic), Kubernetes (Pods, Deployments, Services)
OS & Automation: Linux (Ubuntu), Bash Scripting, Nginx, systemd, SSH, Task
Automation
Networking & Security: MikroTik, TCP/IP, DNS, DHCP, NAT, Routing, WireGuard
VPN, Linux Firewalls (iptables/UFW)
Development & Databases: JavaScript, Node.js, REST APIs, PostgreSQL, SQL,
Telegram Bot Development
Operations: Troubleshooting, Incident Investigation, CRM & PBX Systems (MikoPBX,
FreePBX), Technical Documentation

Professional Experience

TechOps Engineer — Contact Center

2021 – 2026

Administered and troubleshot MikroTik-based network infrastructure, including routing,
NAT, VPN connectivity, firewall policies, and network availability.
Configured, monitored, and troubleshot infrastructure and system availability issues
across networking, Linux, telephony, and software integrations.
Integrated and maintained REST APIs connecting CRM systems with internal and
external operational services.
Managed PBX telephony infrastructure, including MikoPBX and FreePBX.
Automated repetitive operational tasks by developing custom Telegram bots and internal
tooling, reducing manual team workload.
Investigated and resolved technical incidents across networking, Linux systems,
telephony, and software integrations.

DevOps & Infrastructure Projects

Full-Stack Application Platform

Node.js | PostgreSQL | Docker | Linux | Nginx | REST API

Designed and containerized a 3-tier application architecture consisting of frontend,
backend, and PostgreSQL database components.
Used Docker and Docker Compose for application deployment and environment
management.
Configured Nginx as a reverse proxy for traffic routing and SSL termination on Linux
hosts.
Managed database schemas and implemented RESTful API services.

Infrastructure & Linux Homelab

Linux | Docker | Docker Compose | Nginx | WireGuard | Networking

Built a personal Linux infrastructure lab for practical experience with server deployment
and operations.
Orchestrated multi-container applications using Docker Compose and managed Linux
services with systemd.
Implemented WireGuard VPN for secure remote administration and inter-system
networking.
Configured NAT, routing, and firewall policies using iptables/UFW, and troubleshot
connectivity and service availability issues.

Operations Automation Bots

Node.js | JavaScript | Telegram API | REST APIs

Built Telegram bots integrated with REST APIs to automate repetitive operational
workflows for team members.
Implemented asynchronous request handling, business logic, and external service
integrations.

Education & Certifications

DevOps Basic Certification — Hillel IT School (Verification)
Master in World Economics — National Aerospace University (2019 – 2020)
Bachelor in International Economics — National Aerospace University (2015 – 2019)

Languages & Key Strengths

Languages: English (B2 / Upper-Intermediate), Ukrainian (Native)
Core Strengths: Strong Linux & networking fundamentals, end-to-end understanding of
code-to-infrastructure deployments, strong incident investigation mindset, automation-
oriented thinking, fast self-directed learner.