Senior Software Engineer

Own system design and end-to-end delivery of backend microservices for a high-load utility infrastructure platform, covering architecture, deployment, scaling, service boundaries, and resilience.

Integrated Claude Code and agent-driven workflows across planning, implementation, testing, and code review. Built observability with Prometheus, Grafana, structured logging, and distributed tracing; load-tested services with Apache JMeter and improved database response times by approximately 30%.

Designed event-driven, queue-based processing and deployed microservices to Kubernetes using Helm charts and ArgoCD GitOps workflows.

Designed and built a healthcare treatment-planning engine that supports personalized patient care plans with exercises, articles, videos, and progress tracking.

Built and extended RBAC for multiple desktop and mobile client platforms from a shared backend. Integrated AWS Cognito, S3, and Lambda, and implemented encryption and audit logging to protect sensitive patient health data.

Optimized complex SQL queries to improve data retrieval performance.

Led the end-to-end delivery of a mission-critical system for a major Ukrainian telecom operator, meeting performance and delivery expectations.

Managed and mentored a team of three engineers through code reviews, technical decisions, workflow improvements, and the introduction of architecture and coding standards.

Integrated a Ring-Back Tone value-added service through Apollo GraphQL with SMS subscriber control, and implemented client-side SSO and OAuth authentication using Keycloak.

Identified and fixed an SEO issue that was harming product search rankings, improving organic visibility and traffic.

Developed an administration application for a sports betting platform and created an embeddable coupon widget containing seven mini-games for third-party website integration.

Implemented Google OAuth authorization and contributed code reviews and quality checks for colleagues.

Developed a widely used cryptocurrency application in the Netherlands from initial concept through deployment and scaling.

Built a high-performance, SEO-focused Next.js project, integrated Prismic CMS, and migrated content from WordPress. Used WebSockets to support real-time user interactions.

Built an influencer-brand collaboration platform and introduced unit testing practices within the team.