Vitalii Turzhanskyi

Ruby on Rails Developer · Backend Engineer · FinTech Specialist

Location: Khmelnytskyi, Ukraine

LinkedIn · GitHub — Turzhanskyi · GitHub — TurVitAn · GitHub — vitaliit-vvd · GitLab · Telegram @TurhVitalii

Email: [email protected] · [email protected]

CV_Vitalii_Turzhanskyi.pdf

SUMMARY

Ruby on Rails developer with 4+ years of experience building enterprise-grade financial platforms, usage-based billing systems, and complex multi-role applications. I specialize in scalable backend architectures, event-driven payment pipelines, and integrating external APIs — payment gateways, banking (Plaid), OAuth2, and blockchain — with a strong focus on clean code, comprehensive testing, and production observability for mission-critical fintech systems.

What I work with:

• Backend: Ruby on Rails 6/7/8, Service Objects, SOLID, dry-rb, Sequel & ActiveRecord
• APIs: REST, GraphQL, JWT, OAuth2, OpenAPI/Swagger (rswag)
• Data: PostgreSQL (optimization, N+1 prevention, UUIDs, JSONB), ClickHouse, Redis, Elasticsearch
• Event-driven: Kafka/Redpanda, Google Pub/Sub, Sidekiq, Clockwork
• Payments & banking: card gateways (NMI), Plaid, Stripe, multi-currency ledgers, HMAC/JWT webhooks
• Observability & DevOps: OpenTelemetry, Grafana, Prometheus, Loki, Sentry, Docker, Nomad, Terraform, CI/CD
• Testing: RSpec, TDD, 90%+ coverage, FactoryBot, VCR

What I value: Clean, maintainable code; thorough automated testing; production observability; pragmatic problem-solving; clear documentation; and mentoring teammates.

CORE COMPETENCIES

• Backend Architecture: Rails 6/7/8, Service Objects, SOLID, STI, Design Patterns
• API Design: REST, GraphQL, JWT, OAuth2, OpenAPI/Swagger Documentation