Yaroslav Koval' Email & Phone Number

Czechia

Czechia

Czechia

Kyiv City, Ukraine

Kyiv, Ukraine

I’ve troubleshooted duplicating messages in Kafka that gave me deep understanding of docker and Kafka's internals.• Created and developed REST services• Enchased common services logic• Made refactoring for request validations to significantly improve testability• Worked with autogenerating code (from generating services by yaml to gotemplatingusing Go’s sprig library)• Worked with event-driven services• Deployed services in cluster• Deployed cluster itself and set it up entirely• Wrote deployment documentation• Monitored K8s resources during execution• Automated infrastructure processes• Managed EC2 node types/counts and releases configs, secrets, jobs...• Deployed custom Helmfile releases• Supported projects after long freezing

Kyiv, Kyiv City, Ukraine

I’ve worked with complicated high-load system at every level – from writing code to deploying, managing and examining k8s resources.• Learned Python and helped to integrate applied ETL technologies like airbyte, dbt and dagster• Implemented async processing• Worked with system with up to 60 millions of records in one table• Handled complicated data mapping• Created mechanisms for records deduplication, autobuilding dependency tree,dependency intersection during import• Provided optimization for ETL steps, like splitting T(transform) step into severalprojects and pipelines, separation of new/old records during snapshotting• Deployed and examined each part of system ensuring integrity and reliability

Kyiv, Ukraine

I’ve created project solution, developed and deployed application.• Planned project implementation and gathered customer needs• Created Go services using Gin framework• Implemented data interaction and migrations using pgxpool library• Implemented logging/tracing middleware• Implemented email notifications using AWS SES• Implemented telegram notifications• Created cutting-edge frontend application with NEXTjs framework using Server-SideRendering• Implemented data CRUD operations protected by auth• Created convenient and responsive layout• Created full CI/CD process for both front- and back-end for develop and productionenvironments involving docker and GitHub actions deployment• Fully managed AWS account and used a lot of services to store images (ECR), deployapplications (ECS), store data (RDS postgres), send emails (SES), make services public (Route53, Application LB), manage users and accesses (IAM, VPC), store secrets (SysManager) and last but not least - manage alerts and logs (CloudWatch)• Agreed with AWS support to turn off SES sandbox account

Kyiv, Ukraine

I’ve provided new useful architectural approach in frontend for common infrastructure of all projects.• Implemented loan issuance business processes in CRM system• Integrated Ukrainian credit history systems• Applied frontend layout with auth verifications• Maintained issues after release

Kyiv

Created from scratch and maintained projects by myself.• Created from the scratch "Employees applications system", that receives messages from different sources• Provided OLAP cubes integration for reports generation• Made integration with 1C• Maintained and supported different projects