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Zdravko Iskrenov

@zdravkoiskrenov

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Senior DevOps Engineer with 13+ years of experience in automation.

Bulgaria

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What I'm looking for

I am looking for a role that challenges me and allows for continuous learning, ideally in a collaborative environment that values innovation and efficiency.

I am a Senior DevOps & Site Reliability Engineer with over 13 years of experience, specializing in managing large-scale infrastructures and implementing robust CI/CD pipelines. My journey has been marked by significant achievements, such as designing a CI/CD ecosystem that reduced package build times by 65% and deployment frequencies from monthly to daily for IoT fleets.

Throughout my career, I have demonstrated a strong commitment to automation and efficiency. I have successfully managed over 1,400 on-prem servers and have a proven track record of optimizing processes, such as cutting inter-DC sync windows by 1600% and delivering Linux automation solutions that save teams significant time. My technical expertise spans a wide range of tools and technologies, including AWS, Terraform, Ansible, and Docker.

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Experience

Work history, roles, and key accomplishments

Current

Freelance DevOps Consultant

Current

Self-Employed / Borea Design

Mar 2018 - Present (7 years 8 months)

Prototyped two AI-driven Flutter applications with Firebase and S3 backends, optimizing Dart code for 300% faster startup. Packaged Stable Diffusion with CUDA-enabled Docker, reducing image size by 35% and cold-start latency by 55%. Delivered Linux automation and performance tuning for 32 clients, saving teams over 10 hours per week through tooling and system optimizations.

Flutter Firebase S3 Docker CUDA Linux Dart AI

Senior DevOps Engineer

JLL Technologies and Envio Systems GmbH

Dec 2021 - Aug 2024 (2 years 8 months)

Designed and implemented a CI/CD ecosystem, migrating all pipelines to GitHub Actions post-acquisition, which reduced average package build time by 65% and release preparation time from 2 hours to 20 minutes. Defined and enforced organization-wide CI/CD and GitOps guardrails across 40 repositories and 3 product teams, enabling 100% automated deployments and reducing change lead time by 90%. Develo

CI CD GitHub Actions)GitOps

Senior Systems Engineer and Senior System Administrator

PROS Inc. and Vayant Travel Technologies

Sep 2011 - Feb 2018 (6 years 5 months)

Cut inter-DC sync window by 1600% using a custom BitTorrent-style nightly transfer for 100 GB of data, eliminating checksum errors. Deployed HA API edge with Nginx and Keepalived, and scaled Puppet to over 1400 nodes while maintaining configuration drift below 1%; led OS migrations (CentOS & RHEL 5 to 7) with zero unplanned downtime. Engineered multi-site MariaDB Galera & MongoDB clusters; tuned P

BitTorrent Nginx Keepalived

Web Hosting Technical Support

Hostway Corporation

Oct 2008 - Sep 2011 (2 years 11 months)

Delivered LAMP-stack support, handling over 40 incidents daily while consistently meeting SLA and CSAT benchmarks. Performed seamless Linux-based website migrations with zero data loss and minimal downtime. Maintained consistent top-tier performance and provided clear, empathetic customer communication.

LAMP Stack Linux Customer Support