Aleksy Zaleński, Developer in Kraków, Poland
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Aleksy Zaleński

Verified Expert  in Engineering

Networks Developer

Kraków, Poland
Toptal Member Since
August 7, 2019

Aleksy is a DevOps engineer with a solid technical background. He's worked at the world's biggest CDN company, Akamai, as a solutions architect, preparing customers for prestigious events such as the World Cup and the Olympics. Aleksy is currently working as a DevOps engineer at a software company, where he's responsible for the cloud infrastructure, CI/CD pipelines, automation, and resolving various performance and scalability issues.


Amazon Web Services (AWS), Kubernetes, Apache Kafka, GitHub, Flyway, Git...
Toptal Client
Amazon Web Services (AWS), Kubernetes, CI/CD Pipelines, AWS DevOps, Ansible...
Amazon Web Services (AWS), Azure DevOps, Serverless, DevOps, Azure, Cloud...




Preferred Environment


The most amazing...

...project I've worked on is the migration of an entire company infrastructure to Kubernetes.

Work Experience

Senior DevOps Engineer

2022 - PRESENT
  • Maintained and managed infrastructure of 2000+ Amazon EC2 instances and over 40 Amazon EKS Kubernetes clusters.
  • Designed and created a database management process using Flyway and GitHub Actions for over 60 databases managed by over 100 developers.
  • Worked on multiple cost-saving projects that allowed the company to save 100,000+ dollars per year.
Technologies: Amazon Web Services (AWS), Kubernetes, Apache Kafka, GitHub, Flyway, Git, Scaling, MySQL, Networks, Helm

DevOps Engineer

2019 - PRESENT
Toptal Client
  • Created and maintained the customer infrastructure using Amazon EKS (Kubernetes) and GitLab CI/CD. Since it's a healthcare company, it requires HIPAA compliance. Terraform was used as IaC.
  • Developed and maintained the customer on-premise infrastructure using Kubernetes on a single-node deployment. The configuration was done using Ansible.
  • Created and maintained multiple Drupal and WordPress sites using many different Amazon EC2 instances, Docker containers, and ECS. The configuration of EC2 instances was done using Terraform and Ansible.
Technologies: Amazon Web Services (AWS), Kubernetes, CI/CD Pipelines, AWS DevOps, Ansible, GitLab, Amazon Elastic Container Service (Amazon ECS), Docker, Terraform

DevOps Engineer

2020 - 2022
  • Created and maintained architecture and resources for a fully serverless application in Azure.
  • Developed full E2E CI/CD pipelines for creating the infrastructure and deploying the application code to a Kubernetes cluster deployed in AWS.
  • Mitigated customer application performance issues.
  • Migrated a big company's on-premise infrastructure to Azure. We created Azure landing zones using the best practices of Terraform Cloud and Cloud Adoption Framework.
Technologies: Amazon Web Services (AWS), Azure DevOps, Serverless, DevOps, Azure, Cloud, CI/CD Pipelines, Website Performance, Infrastructure, Agile

DevOps Engineer

2018 - 2020
  • Created and maintained the company's microservices infrastructure deployed using Kubernetes Operations (Kops), Kubernetes, and AWS.
  • Developed CI/CD pipelines for deploying code to AWS.
  • Aided developers with the implementation and deployment of code into the infrastructure.
  • Solved different performance and scalability challenges.
  • Migrated the entire customer infrastructure to Kubernetes.
Technologies: Amazon Web Services (AWS), Bash, Kubernetes, Terraform, Docker, Linux, Laravel, Kubernetes Operations (kOps), Continuous Delivery (CD), Continuous Integration (CI)

Solutions Architect

2015 - 2018
Akamai Technologies, Inc.
  • Provided consultancy for customers as the technical expert.
  • Owned the technical components of a customer integration project, including configuration, debugging, documentation, testing, and go-live support.
  • Prepared configurations for significant events such as the Olympics and the European and World Cups.
  • Identified technical risks and provided mitigation strategies.
  • Developed automation scripts that helped the entire team with everyday tasks.
Technologies: JavaScript, Python, Streaming, HTTP, DNS, Content Delivery Networks (CDN), Transport Layer Security (TLS)

Migration of a Company Infrastructure to Kubernetes

I migrated the entire company infrastructure from bare cloud instances to a Kubernetes cluster. This involved creating the CI/CD pipelines, with self-contained Docker containers as an artifact, creating Kubernetes clusters for all three environments, deploying monitoring and logging, and ensuring the application is scalable and resilient to failures.

Migration of an Entire Customer Infrastructure to Terraform

I was responsible for migrating the entire customer AWS infrastructure, created manually using Portal, to an IaC in Terraform. The infrastructure consisted of many different AWS services (VPC, EC2, RDS, ElastiCache, IAM, etc.), so we needed to build and utilize many Terraform modules.

Migration of an Infrastructure from On-premise to Azure

Acting as a DevOps Engineer, I was involved in migrating a big company's on-premise infrastructure to Azure. We created Azure landing zones using Terraform Cloud and Cloud Adoption Framework best practices.

Preparing the Largest Streaming Companies for Big Events

I was working with the biggest streaming companies in the world and preparing them for events such as the Olympics, the World Cup, and the Euro Cup. This required validating and tweaking their entire streaming setup and ensuring it could handle the load of millions of users connected at once, with minimum latency and re-buffering.
2017 - 2018

Master's Degree in Information and communications technology (ICT)

AGH University of Science and Technology - Cracow, Poland

2013 - 2017

Bachelor of Engineering Degree in AGH University of Science and Technology

AGH University of Science and Technology - Cracow, Poland


Certified Systems Administrator

The Linux Foundation


HashiCorp Certified: Terraform Associate



AWS Certified DevOps Engineer Professional



AWS Certified SysOps Administrator Associate



CKA: Certified Kubernetes Administrator

The Linux Foundation

JULY 2020 - JULY 2024

Microsoft Certified: DevOps Engineer Expert


APRIL 2020 - APRIL 2024

Microsoft Certified: Azure Administrator Associate



Git, Terraform, GitLab, Grafana, Helm, Jenkins, Ansible, Istio, Amazon Elastic Container Service (Amazon ECS), GitHub, Flyway


DevOps, Azure DevOps, Continuous Delivery (CD), Continuous Integration (CI), Agile


Docker, Kubernetes, Amazon Web Services (AWS), Azure, Linux, Google Cloud Platform (GCP), Apache Kafka


Bash, JavaScript, Python, PHP 7


MySQL, Redis




Scaling, Website Performance, Infrastructure, AWS DevOps, Content Delivery Networks (CDN), DNS, HTTP, Networks, Cloud, Streaming, Video Streaming, Transport Layer Security (TLS), Prometheus, Kubernetes Operations (kOps), Serverless, CI/CD Pipelines, HTTP Live Streaming (HLS), Akamai

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