Олег

Oleg Siekhin
Cloud / Infrastructure Engineer · Windows Server · Networking · IaC (Terraform) · CI/CD · Monitoring
Odesa, Ukraine · Remote / hybrid · EU timezone [відкрити контакти](див. вище в блоці «контактна інформація») (Telegram / Viber) [відкрити контакти](див. вище в блоці «контактна інформація») LinkedIn
English B2 - written + spoken technical OK

SUMMARY
Infrastructure-leaning engineer with a long Linux / Windows Server background and years of running production services in Docker
and hybrid environments. Hands-on with networking fundamentals (DNS, VPN, firewalls, subnetting/routing concepts),
Infrastructure as Code (Terraform / scripting), CI/CD (GitLab CI, GitHub Actions), monitoring, and PostgreSQL/MySQL operations.
Earlier system administration covered Linux, FreeBSD, and Windows Server (mail, DNS, VPN) - a solid foundation for cloud
infrastructure work. Seeking a remote Azure Infrastructure Engineer / Cloud Infrastructure role; comfortable ramping up on
Microsoft Azure services (Virtual Networks, NSG, RBAC, Azure Virtual Desktop, Azure Backup / Site Recovery, Azure Monitor) and
IaC with Terraform / Bicep. Open to B2B / ФОП.

CORE SKILLS
Cloud & IaC AWS basics (EC2, S3, networking concepts); Terraform / scripting for repeatable infra; cloud-ready patterns; Azure
fundamentals (VNet, RBAC, storage concepts)
Windows & Linux Windows Server (AD DS, DNS, Group Policy concepts); Linux CLI, systemd/services, SSH, firewalls; FreeBSD (earlier)
Networking DNS, VPN (site-to-site concepts), subnetting, routing, firewalls, network segmentation
Containers & K8s Docker (images, compose, registries); Kubernetes basics (Deployment, Service, Ingress, kubectl)
CI/CD GitLab CI, GitHub Actions; Jenkins familiarity; build → test → deploy pipelines for IaC
Observability Prometheus / Grafana concepts; logs, health checks, alerting, uptime for production services
Data stores PostgreSQL, MySQL/MariaDB, Redis; MongoDB basics; backup / restore mindset
Automation Bash / Python scripting; PowerShell / Azure CLI familiarity; Git / GitLab workflow

WORK EXPERIENCE
DevOps / Platform Engineer - LEMAN 04.2025 - Present
Internal platform · Docker / Linux · CI-friendly delivery of API & AI services
Packaged and ran production services in Docker on Linux (API gateways, workers, RAG/LLM tooling).
Maintained deployment flow for FastAPI/Python and internal tools: env configs, restarts, health checks, rollback-friendly releases.
Supported CI-oriented delivery (build images, run tests/jobs, promote to staging/prod) and day-to-day Linux ops.
Worked with PostgreSQL / MS SQL connectivity from services; access control and network boundaries for corporate data.
Helped keep production platform services stable: logging, resource usage, alerting, incident follow-up with developers.
Automated repetitive ops with scripts and workflow tools (scheduling, batch jobs, n8n-style pipelines).
Explored cloud-ready patterns (container registry, AWS basics, IaC with Terraform) for moving workloads beyond a single host.
Stack: Linux, Docker, Git, FastAPI/Python services, PostgreSQL/MS SQL, Redis, Bash/Python scripts, CI pipelines, AWS basics, Terraform,
OAuth/network ACLs
Backend / DevOps Engineer - Qualium Systems 03.2024 - 03.2025
qualium-systems.com · Docker delivery · Linux · queues
Participated in Docker-based delivery and day-to-day Linux server tasks for Laravel/Yii2 products.
Helped wire CI-friendly releases: build artifacts, env separation, Redis/Horizon workers as systemd/container jobs.
Tuned high-load paths with Redis, queues, and async workers; watched service health under load.
Documented REST APIs (Swagger/OpenAPI) and collaborated with developers on deploy/runtime issues.
Supported Postgres/MySQL-backed services - migrations awareness, connection limits, backup / restore mindset.
Stack: Linux, Docker, Git, Laravel/Yii2 services, Redis, Horizon/queues, PostgreSQL/MySQL, Swagger, CI/CD practices

PHP Developer / Platform support - Brander 11.2022 - 02.2024
branderstudio.com · production Yii2 · Linux
Kept production Yii2 backends stable: deploys on Linux, config, retries/timeouts for external APIs.
Built REST APIs and worked with frontend on release/UX of admin tooling.
Practiced safe production changes (fallbacks, logging) - useful habit for infrastructure ownership.
Stack: Linux, PHP/Yii2, REST, Git, production ops
Full-Stack PHP Developer - OxTech 03.2022 - 11.2022
OxTech (LinkedIn)
Developed product features with Dockerized local/dev environments on Linux.
Delivered REST APIs with Swagger; fixed cross-stack issues with the team.
Stack: PHP 7, Symfony 4, Linux, Docker, Swagger, Git
Backend PHP Developer - Wizardsdev 02.2021 - 02.2022

Built REST APIs; used GitLab, Docker, and YouTrack in a team delivery process.
Worked with MySQL-backed services and containerized tooling for day-to-day development.
Stack: PHP 7, Symfony, Laravel, MySQL, Docker, GitLab CI/workflow, Swagger
PHP Developer - Intertelecom 10.2016 - 03.2021
intertelecom.ua · telecom / billing · high availability
Owned backend services under high-availability expectations; Linux / Docker when needed for delivery.
Integrated payment/billing APIs; profiling and refactoring for stable production load.
Partnered with ops on MySQL/MariaDB/PostgreSQL-backed services and HA / failover awareness.
Stack: PHP, Laravel, Yii2, MySQL/MariaDB, PostgreSQL, Docker, Linux, Git/Hg
Full-Stack Developer - Teletrade 10.2012 - 10.2016
Delivered company web projects end-to-end; basic Linux server administration alongside development.
Stack: Yii, PHP/MySQL, Linux admin, JavaScript, HTML/CSS

PHP / Web Developer - Citrus Discount 01.2011 - 10.2012
Maintained e-commerce stacks; MySQL optimization, migrations, and hardening against DDoS.
Stack: PHP, Bitrix, Zend, MySQL, Linux
Full-Stack Developer - WEB-studio 07.2010 - 12.2011
Client sites on Joomla/WordPress/custom PHP; ongoing support and bugfixes.
Stack: PHP, Joomla, WordPress, MySQL
CMS / Web Developer - jcsystem.de 09.2008 - 06.2010
CMS implementations and client support (Joomla / WordPress).
Stack: PHP, Joomla, WordPress
System Administrator / PHP Developer - Intercom 09.2005 - 09.2008
Administered Linux, FreeBSD, and Windows Server (mail, DNS, VPN) - core ops foundation for hybrid / cloud infrastructure
work.
Built and supported small PHP sites alongside infrastructure work (DevOps-leaning role).
Stack: Linux, FreeBSD, Windows Server, mail/DNS/VPN, PHP

EDUCATION
Odessa State Economic University - Finance, Odesa
Ukrainian State Academy of Telecommunications named after A.S. Popov - TKS, Odesa