Nazar Vinnychuk

Delivered backend and infrastructure improvements for confidential U.S. clients across financial services, construction SaaS, and FedRAMP-regulated environments.

Migrated a large Ruby on Rails application from Rails 4 to Rails 5 and subsequently to Rails 6. Contributed to the migration of APIs from REST to GraphQL and introduced project-wide RuboCop adoption.

Developed and maintained backend features for an online lending platform. Resolved application and production issues, refactored legacy code, and performed code reviews.

Developed backend and frontend features for a large-scale cloud learning platform built around Ruby on Rails and microservices. Configured AWS OpsWorks, implemented user-activity tracking with Mixpanel, and extended an assessment microservice.

Built Parse.com-to-PostgreSQL migration tooling, designed a Node.js architecture inspired by Trailblazer, and significantly improved ActiveAdmin performance.

Built backend features for secure mobile communications, including inbound email replies posted directly into chat rooms and automated messaging.

Built e-commerce features including a store-credit refund tool affecting approximately 30,000 customers, tax logic, internal APIs, and SendGrid integrations.

Performed major core refactoring to unify personal and company-wide employee skills within a performance-management SaaS platform.

Developed web applications and administered Linux and Windows servers.

Built web systems and production infrastructure, optimized complex SQL workloads, developed Ruby administration tooling and a Rails retail and inventory system, and created the VoKadio Chrome extension, reaching 21,000+ users.