Sebastian is available for hire

Sebastian Andrei Roman

Verified Expert in Engineering

DevOps Engineer and Developer

Location

Bucharest, Romania

Toptal Member Since

September 20, 2021

Sebastian is a DevOps engineer with a master's degree in networks and software for telecommunications. He is also a problem solver who is always ready to define the root cause of a problem and prevent further issues. Sebastian went from a service engineer to a specialist with a DevOps mindset, focusing on automation to find ways to eliminate manual tasks and challenging himself daily with various complex topics.

Linux DevOps Kubernetes Microservices Bitbucket DevOps Engineer Prometheus Infrastructure as Code (IaC)System Administration Cloud Amazon RDS Cloud Migration AWS DevOps Identity & Access Management (IAM)Bash Filebeat OCI

Portfolio

Deloitte Digital

Kubernetes, Docker, Git, Ansible, Terraform, Bash, Linux, Buildkite...

Ecoinvent Association

Amazon Web Services (AWS), DevOps, Kubernetes, Docker...

NexClipper

Grafana, Kubernetes, Prometheus, Amazon Web Services (AWS), CI/CD Pipelines...

Experience

Linux - 6 years CI/CD Pipelines - 5 years Docker - 5 years Git - 5 years Kubernetes - 5 years Terraform - 4 years Amazon Web Services (AWS) - 4 years AWS Cloud Architecture - 2 years

Availability

Full-time

Preferred Environment

Kubernetes, Docker, Ansible, Git, Terraform, Amazon Web Services (AWS), Google Cloud, Prometheus, CI/CD Pipelines, Amazon EKS

The most amazing...

...thing I've built is an app's full architecture: development, staging, & production environments. Its infrastructure is set with Terraform in DigitalOcean & AWS.

Work Experience

DevOps Consultant

2021 - PRESENT

Deloitte Digital

Developed a deployment pipeline for multiple microservices, including building Docker images and deploying them to AWS.
Created and automated infrastructure on AWS with Terraform code.
Developed a Bash script to automate tasks and facilitate steps for team development.
Architected monitoring and alerting for existing microservices.
Set up automation tests to run at specific hours and to notify on mail and Slack if failing.

Technologies: Kubernetes, Docker, Git, Ansible, Terraform, Bash, Linux, Buildkite, Continuous Delivery (CD), Continuous Integration (CI), DevOps Engineer, DevOps, GitHub, Amazon Web Services (AWS), CI/CD Pipelines, Monitoring, Helm, Alpine Linux, Jenkins, Amazon S3 (AWS S3), Amazon EC2, Amazon Elastic Container Registry (ECR), Infrastructure, AWS DevOps, Google Cloud Build, Google Cloud Engine, Google Cloud SDK, Bash Script, Vault, Amazon RDS, Telnet Protocol, Cloud, Scripting, Infrastructure as Code (IaC), Amazon EKS, Amazon Virtual Private Cloud (VPC), Identity & Access Management (IAM), Serverless, Site Reliability Engineering (SRE), Bitbucket, Elasticsearch, Cloud Computing, Load Balancers, SSL, System Administration, PostgreSQL, AWS IAM, AWS ELB, Cloud Native, DNS, Leadership, Azure, Containers, Microservices, Logging, Argo CD, Azure DevOps, Azure IaaS, LokiJS, Service Mesh, GitLab CI/CD, Architecture, GitHub Actions, Cloud Migration, Istio, AWS Lambda

DevOps Engineer

2023 - 2023

Ecoinvent Association

Designed, implemented, and maintained infrastructure on DigitalOcean.
Designed and implemented CI/CD pipeline for multiple stages to build and deploy code to Kubernetes cluster pipeline created in GitHub actions.
Implemented a monitoring and logging solution based on Prometheus and Loki Stack.

Technologies: Amazon Web Services (AWS), DevOps, Kubernetes, Docker, Infrastructure as Code (IaC), CI/CD Pipelines, Azure, Google Cloud Platform (GCP), Logging, Monitoring, DigitalOcean, Red Hat OpenShift, LokiJS, Bash, Helm, Vault, DevOps Engineer, GitHub, Architecture, Service Mesh, GitHub Actions, Istio

DevOps Engineer

2021 - 2022

NexClipper

Developed the infrastructure for the development, staging, and production environments.
Created pipelines for building, deploying, and configuring new code in the existing environment without downtime.
Helped developers debug and fix issues on the application level.
Managed GitHub code repositories and the Docker Registry Helm.
Helped the client to find and implement cost-optimization solutions for the infrastructure.

Technologies: Grafana, Kubernetes, Prometheus, Amazon Web Services (AWS), CI/CD Pipelines, Linux, Git, Harbor, Terraform, Infrastructure as Code (IaC), DigitalOcean, Helm, Amazon EKS, Amazon Virtual Private Cloud (VPC), Identity & Access Management (IAM), Serverless, Site Reliability Engineering (SRE), Bitbucket, RabbitMQ, Cloud Computing, Load Balancers, SSL, SSL Certificates, PostgreSQL, AWS DevOps, AWS IAM, AWS ELB, Cloud Native, DNS, Redis, Amazon DynamoDB, Google Cloud Platform (GCP), Leadership, Containers, Microservices, Architecture, Cloud Architecture, AWS Cloud Architecture, Logging, LokiJS, Service Mesh, GitLab CI/CD, Bash, Vault, DevOps, DevOps Engineer, GitHub, Cloud Migration, Istio

Senior Service Engineer

2017 - 2021

Orange Business Services

Developed a monitoring stack based on Prometheus for multiple services under management.
Built a monitoring stack based on Nagios and Centreon for two mailing services.
Implemented a log management stack based on Elasticsearch for all services under management.
Automated repetitive tasks with Ansible playbooks and configured them to run periodically.
Created Selenium tests with Python to check the FE interface of our services.
Built Bash scripts for configuring services on old machines.

Technologies: Linux, Bash, Prometheus, Grafana, ELK (Elastic Stack), Ansible, Kubernetes, Continuous Delivery (CD), Continuous Integration (CI), DevOps Engineer, DevOps, GitHub, CI/CD Pipelines, Monitoring, Logstash, Filebeat, Alpine Linux, Infrastructure, Bash Script, Python, Telnet Protocol, Kibana, Cloud, Scripting, Infrastructure as Code (IaC), Helm, Serverless, Site Reliability Engineering (SRE), Bitbucket, Elasticsearch, Cloud Computing, Load Balancers, SSL Certificates, System Administration, Cloud Native, DNS, Leadership, Containers, Microservices, Logging, GitLab CI/CD

Experience

Full Deployment Pipeline for a Messaging App

I created the full deployment of a messaging app in an on-premise cloud infrastructure, including monitoring and log management. I built the infrastructure with Terraform, and the app was deployed on multiple Kubernetes clusters depending on the environment. Databases were created as separate instances and had a daily backup. All steps were automated with Ansible playbooks and were deployed from GitLab CI/CD.

Observability App

A Node.js and Go-based app, packed into Docker containers and deployed into a Kubernetes cluster. All steps are done with a GitLab CI/CD pipeline, and all infrastructure is created with Terraform code. The app uses a Prometheus stack for monitoring and a Grafana stack for logging. It is hosted on DigitalOcean and AWS cloud providers, with the lower environments on DigitalOcean and production on AWS.

Public Sector App

A Java-based app packed into Docker containers and managed in a Kubernetes cluster. The infrastructure was created and deployed with a Buildkite pipeline into AWS. All environments, including development, staging, and production, are AWS-based with Terraform code. The pipeline is set on the YAML-based tool Buildkite—for building, testing, packing, scanning, and deploying new code into a Kubernetes cluster. Istio is used for mesh service, and Kong as an API gateway, deployed with Helm packages.

Education

2019 - 2021

Master's Degree in Networks and Software for Telecommunications

Politehnica University of Bucharest - Bucharest, Romania

Certifications

NOVEMBER 2022 - NOVEMBER 2025

AWS Certified Cloud Practitioner

AWS

SEPTEMBER 2022 - SEPTEMBER 2024

HashiCorp Certified: Terraform Associate

Hashicorp

JANUARY 2022 - JANUARY 2025

Certified Kubernetes Administrator

CNCF

OCTOBER 2021 - PRESENT

Oracle Certified Associate

Oracle

Skills

Tools

Bitbucket, Git, GitLab CI/CD, Terraform, Grafana, Helm, Amazon Elastic Container Registry (ECR), Vault, GitHub, Amazon EKS, Amazon Virtual Private Cloud (VPC), AWS IAM, AWS ELB, Logging, Istio, Ansible, ELK (Elastic Stack), Kibana, Logstash, Jenkins, RabbitMQ

Paradigms

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

Platforms

Linux, Kubernetes, Docker, Buildkite, Amazon EC2, Amazon Web Services (AWS), Harbor, DigitalOcean, Cloud Native, Azure IaaS, Alpine Linux, Google Cloud SDK, Google Cloud Engine, Oracle Cloud Infrastructure (OCI), Google Cloud Platform (GCP), Azure, Red Hat OpenShift, AWS Lambda

Languages

Bash, Bash Script, Python

Storage

Amazon S3 (AWS S3), Elasticsearch, LokiJS, Google Cloud, Oracle Cloud, PostgreSQL, Redis, Amazon DynamoDB, MySQL

Other

Containers, Prometheus, Monitoring, Amazon RDS, Telnet Protocol, DevOps Engineer, AWS DevOps, CI/CD Pipelines, Cloud, Scripting, Infrastructure as Code (IaC), Identity & Access Management (IAM), Site Reliability Engineering (SRE), Cloud Computing, Load Balancers, System Administration, Leadership, Argo CD, Service Mesh, GitHub Actions, Cloud Migration, Networking, Filebeat, Google Cloud Build, Infrastructure, Serverless, SSL, SSL Certificates, DNS, Architecture, Cloud Architecture, AWS Cloud Architecture

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