Przemysław Kozłowski

DevOps Engineer | Senior Backend Developer

linkedin.com/in/przemyslaw-kozlowski-devops | github.com/przemyslaw-koz

Summary

DevOps Engineer with 12 years of experience in IT, including 5+ years in .NET and 4 years in Node.js as Senior Backend Developer. Over last 3 years, changing role into DevOps, focusing on CI/CD pipelines, infrastructure automation and deployment processes. Strong development background gives me a solid understanding of both development and operations, allowing me to effectively bridge the gap between teams.

Experience

Most Recent Experience

• DevOps Engineer at PGS Software / Xebia (03.2023 – now)
  • Designed and maintained CI/CD pipelines and migrated classic Azure DevOps pipelines to YAML.
  • Automated infrastructure provisioning using Terraform and Ansible.
  • Built and maintained Docker-based environments.
  • Improved observability by upgrading monitoring stack (ELK and Grafana) to secure and up to date version.
  • Redesigned and optimized automation test pipelines to reduce execution time from ~10 hours to 3-4 hours.
  • Developed automation scripts in Bash to support deployment processes.
  • Worked on application startup process optimization - reduced deployment process and added readiness notification.
• Senior Node.js Developer at PGS Software / Xebia (04.2022 – 01.2023)
  • Developed and maintained backend applications using NestJS and TypeScript.
  • Replaced custom API Gateway application with Traefik simplifying architecture and reducing maintenance.
  • Designed and developed REST APIs supporting microservices architecture, written in NestJS.
  • Implemented unit tests using Jest.
• Node.js Developer at Future-Processing (01.2020 – 04.2022)
  • Developed and maintained backend applications using Node.js (JavaScript) with Hapi.js framework.
  • Developed serverless microservices using AWS Lambda, API Gateway and Serverless framework.
  • Implemented and maintained event-driven architecture with SQS.
  • Worked on ETL pipelines for data indexing in Elasticsearch.
  • Worked with DynamoDB and PostgreSQL.
  • Used Terraform and GitLab CI to support infrastructure and deployment processes.

Previous experience

• Software Developer at Future-Processing (11.2019 - 01.2020)
  • Developed REST API for sports tournament management system using ASP.NET and SQL Server.
  • Worked with Entity Framework and C#.
• Software Developer at NGK Ceramics (03.2018 - 11.2019)
  • Developed multiple applications supporting manufacturing production process, with ASP.NET and Oracle Database.
  • Automated data processing and tracking production progress, significantly reducing manual work.
• Software Developer at Rescop (05.2014 - 02.2018)
  • Built web application for documents generation and data processing using Web Forms and SQL Server.

Skills

Cloud & Infrastructure

• AWS (Lambda, API Gateway, SQS, Cognito)
• Docker
• Kubernetes

CI/CD

• Azure DevOps Pipelines
• GitHub Actions

IaC

• Ansible
• Terraform

Languages

• Node.js
• C#
• Python

Databases

• PostgreSQL
• DynamoDB
• MS SQL Server

Personal hobby projects

• Built and maintaining self-hosted infrastructure using Kubernetes (k3s).
• Managing containerized applications using both Kubernetes and Docker Compose.
• Implemented infrastructure automation using Ansible (roles for node preparation, configuration and service setup).
• Set up CI pipelines for Kubernetes manifests and Ansible playbooks linting and validation.
• Using Cloudflare Tunnel to securely expose self-hosted services to the internet without opening ports.
• Serving additional small web applications using Vercel and integrating them with own custom domain.

Education

• Silesian University of Technology – Mechanical Engineering (MSc)
• Silesian University of Technology – Biomedical Engineering (BSc)