Hi, I'm Kostiantyn!

DevOps Engineer

I'm enjoy solving complex problems and believe that delivering sustainable and scalable solutions, while ensuring alignment with organizational goals, is key to success. My focus is on providing high-quality, reliable results that drive business growth.

User Avatar

Skills

Cloud & ci/cd

Design and implement high-availability, scalable, and cost-optimized infrastructures from scratch. Automate build, test, and deployment processes to ensure efficient and reliable application delivery.

Tools

Experienced in Terraform with linting, testing, and approval workflows for infrastructure changes. Utilize Terragrunt for managing multi-account organizations while following the DRY methodology. Proficient in Kubernetes for microservice architectures, including writing private HELM charts and building CI/CD pipelines for HELM-based applications with linting and testing. Strong focus on DevSecOps, integrating security scanning and code analysis within CI/CD pipelines.

Monitoring & tracing

We need the 'eyes' in every project for the proactive monitoring to predict and resolve issues before they impact production. This philosophy drives the design of robust monitoring and alerting solutions, ensuring system reliability and performance.

Build & deploy

Experienced in deploying applications across multiple programming languages, from Delphi to .NET and Rust. For example, this site is built with TypeScript and Next.js, running on AWS infrastructure. Primarily use Python and Bash for scripting and HCL and YAML for infrastructure as code, while also proficient in C# and JavaScript development.

AWS Services

Experience working with both traditional and serverless architectures, ranging from simple VPC-EC2-ALB deployments to complex event-driven solutions utilizing VPC, EKS, ECS, Fargate, Lambda, ALB, API Gateway, CloudFront, S3, SNS, SQS, and other AWS services. Skilled in optimizing AWS resource utilization and cost efficiency. For example, successfully implemented a solution where this site now operates at zero cost per month on AWS.

OS & Web

Manage Windows and Linux servers for both development and production environments. Configure and maintain web servers, proxies, and load balancers, implementing GeoIP filtering and security hardening to enhance system protection and performance.

Virtualization & Storage

Experienced in cloud and on-premise virtualization, managing networking across both hardware and cloud-based environments. Skilled in designing and maintaining distributed storage systems for on-premise solutions, ensuring scalability and reliability.

SQL & NoSQL

Configure and manage on-premise and cloud-based databases and clusters, ensuring security, optimization, and high availability for both SQL and NoSQL solutions. Expertise in auto-failover PostgreSQL clusters using Patroni, etcd, HAProxy, and PgBouncer, including implementation for a government system (NDA) as a high-availability on-premise solution.

Companies & Projects

Agiliway

Agiliway (Jun 2021 - Now)

[NDA] Projects

Designed and built cloud infrastructures from scratch on AWS. Implemented Infrastructure as Code (IaC) solutions using Terraform and Terragrunt and developed CI/CD pipelines with GitHub Actions and GitLab CI. Focused on enhancing security, optimizing architecture, and reducing costs to improve overall system efficiency.
Freelance

Freelance (Feb 2021 - Jun 2021)

[NDA] Projects

Designed and implemented high-availability infrastructures from scratch. Dockerized, built, and delivered projects across multiple languages including .NET, PHP, JavaScript, Go, and Python. Configured auto-failover PostgreSQL clusters using Patroni, etcd, HAProxy, and PgBouncer. Automated builds, tests, and deployments for all environments, and developed custom Telegram bots to automate CI/CD workflows. Implemented monitoring and alerting solutions using ELK stack and Prometheus + Grafana.
IT4Medicine

IT4Medicine (Apr 2017 - Feb 2021)

Telemedicine platform, medical information systems, PACS etc.

Implemented cutting-edge technologies into existing workflows. Designed high-availability infrastructures for high-load telemedicine platforms and medical systems, ensuring high-level security compliance. Led the migration of applications from Windows to Docker and Kubernetes, and transitioned CI/CD pipelines from TeamCity to GitLab CI. Developed unique backup services and integration solutions with GitLab, YouTrack, Telegram, and Grafana.