Michalis Mengisoglou - DevOps Engineer

About Me

I'm a DevOps engineer at HPE, where I build CI/CD platforms and cloud infrastructure. I also take on freelance work in automation and platform engineering. I enjoy working across the entire software stack - from low-level systems programming to APIs and frontend applications.

Outside of work, I build systems for the sake of understanding them. I've written an operating system from scratch twice, once in C++ and once in Rust. More recently, that curiosity has turned toward systematic trading, where I'm building portfolio management tools, backtesting engines, and the infrastructure that supports them.

Core Skills

AWS / DigitalOcean
Terraform / Ansible
Python / Go / Rust

Docker / Kubernetes
Helm / Kustomize
GitHub Actions / Jenkins

Linux, Bash
Monitoring (Prometheus, Grafana)
Networking & Security

Experience

DevOps Engineer (Freelance) - Nautech Systems

Mar 2026 - Present

Architected and deployed highly available infrastructure for the customer subscription platform on DigitalOcean using Terraform, including load balancing, VPC, managed databases, and automated configuration with Ansible.
Containerized the application with Docker and enhanced the CI/CD pipeline, enabling automated blue-green deployments for zero downtime releases.
Designed a Git-based promotion process: merged PRs auto-deploy to staging, while tagging a commit promotes to production.
Revamped the Stripe payment integration for reliability, resolving idempotency issues and out-of-order webhook events.

DevOps Engineer - Hewlett Packard Enterprise

Nov 2023 - Present

Developed and optimized CI/CD and release management pipelines to streamline development and deployment processes.
Managed highly available and reliable infrastructure to support development and operations teams.
Containerized internal applications (Jenkins, Harbor, JFrog) to achieve better maintainability.
Improved the build orchestrator, leading to 30% faster and more consistent builds, supporting developers in feature development and testing.
Streamlined product versioning under a unified semantic scheme, enhancing the overall release process.
Monitored and resolved software vulnerabilities (CVEs) to maintain a secure codebase.

IT Engineer - Hellenic Army

Sep 2022 - Sep 2023

Responsible for IT-related projects and digitalization initiatives as part of my mandatory military service.
Containerized applications and deployed them on Kubernetes clusters.

DevOps Engineer - Arrikto (MLOps Startup)

Nov 2020 - Jul 2022

Developed an automated tool to deploy Arrikto's Enterprise Kubeflow distribution on Amazon EKS, cutting setup time by over 50% and enabling faster customer onboarding and greater deployment scalability.
Oversaw AWS setup, provisioning all necessary resources like IAM roles, VPCs, subnets, and EKS clusters to facilitate seamless deployments.
Built multi-node Kubernetes clusters on cloud and local platforms (AWS, Vagrant).
Improved account management system with OIDC authentication integration, allowing connection to various customer identity providers like GitLab, Google, and Okta.

Full Stack Developer - Freelancer

2018 - 2020

Developed backend and frontend components for comprehensive solutions and deployed them to Azure App Service.
Managed APIs, creating RESTful APIs and SDK clients for efficient data communication.
Implemented payment integration with Viva Wallet for seamless online transactions.
Developed automated e2e tests using Playwright.

Education

Integrated Master of Electrical and Computer Engineering

2015 - 2020, National Technical University of Athens

Grade: 9.0/10 (Summa Cum Laude).

Featured Projects

AssetBloom

An app for managing long-term diversified investment portfolios. Fully automated deployment on a single VM with Terraform, Ansible and Docker Compose.

Visit AssetBloom

Me Operating System

A Unix-like operating system built from scratch with C++. It features virtual memory management, FAT file system support, process scheduling and a basic IP networking stack.

Visit Repository View a second attempt in Rust

Algo Trading

A set of algorithmic trading building blocks in Python, featuring bootstrap implementation, walk-forward optimization, risk of ruin calculations and visualizations.

Visit Repository

Portfolio Management

A Python library and CLI tool for managing my long-term diversified portfolio, with features like optimal weight allocation, rebalancing and performance tracking.

Visit Repository

Feel free to explore more of my projects on GitHub.

Contact

Email: michalis.mengisoglou@gmail.com

LinkedIn: Michalis Mengisoglou