About me

My name is Mario Castellanos, I am a software developer and consultant focused on cloud infrastructure. I have 10 years of experience working to deliver software that matters to business and users.

I have advanced experience in cloud architecture design and running applications in the cloud. I regularly work with the following technologies:

  • AWS (IAM, Lambda, EC2, ECS, Security, Compliance, Networking, Route53, CodePipeline/Codbuild, Certificate Manager, GuardDuty, Secrets Manager, Security Hub, among others)
  • Infrastructure as Code: Terraform, Ansible.
  • Docker and all around containers.
  • Python, Bash, Linux administration skills.
  • CICD: Jenkins, CircleCI, GOCD, Concourse.
  • TestCafe, Selenium.

I strive to be a generalist, and have hands-on experience with other programming languages like JavaScript, Java ,Golang and Clojure and have done deployments with Google Cloud and Kubernetes.

What can I do ?

  • Infrastructure Development and Operations.

  • Training and Coach : Test Driven Development, software testing and quality, Agile and DevOps practices, Bussiness/Requierment Analysis, Cloud Architecture, Kanban and Lean, Pair Programming, Developer Productivity, Automation.

  • Test Automation (from UI to Infrastructure).

Culture matters as much as Tech

I believe that a culture of collaboration, continuous experimentation and fast learning matters as much as the engineering skills. I have successfully led on-prem to cloud migration projects, moving hundreds of applications to AWS, and helping multiple client teams to understand and embrace the DevOps principles.

Things I have done:

The last fiver years I worked in Germany for the technology consultancy ThoughtWorks, coaching from startups (20+ people) to the supremely large organisations (10K+ people).

Projects and clients I have worked for include:

  • One of the biggest automotive companies in Germany: I led and co-delivered a cloud migration project to deploy hundreds of applications in AWS and coached multiple teams to develop and operate them.
  • One of the top three e-commerce platforms in Germany: As general developer and quality coach,the plattform serves thousands of requests per second, and we deployed to production hundred of times per day.
  • A multinational retailer: As infra dev and quality coach, raising the bar on CICD and testing, we successfully delivered an offline & mobile friendly web application to replace a legacy sales & customer management software.
  • A Berlin based IOT Start-up: As infra dev helping the team to set-up metrics and monitoring.
  • Electric Paper GmBH: As developer, tester and infrastructure engineer for a Survey Management solution based on a web application. Test automation on the UI, performance and security testing, monitoring.

Contact

If you want to get in touch, then please reach me via Linkedin