Goran – Ruby, Ruby on Rails, React Native

It's an enterprise fintech platform serving millions of members and managing billions in assets.

• Developed enterprise fintech platform features and back-end services in the investments domain.
• Worked on pension investments, fund logic, and related back-end services.
• Supported backend systems and CRM during the monolith-to-microservices migration.
• Optimized SQL queries and improved performance.
• Applied monitoring, detailed logging, and reliability practices for production financial workloads.
• Helped scale the engineering organization from 40 to 200+ engineers.
• Co-created internal tooling used company-wide.

It's a mobile app that includes a couple of screens from the larger company's application, which employees use to check their pensions.

• Contributed to the development of key customer-facing screens, including the letters and biometrics experiences.
• Helped enhance core product workflows by improving the usability and functionality of the letters and biometrics screens.

It's a mobile application for a food delivery company.

• Took ownership of an existing mobile application and delivered numerous new features.
• Added engaging gamification features to improve user experience and retention.
• Introduced CI/CD pipelines and automated testing to strengthen delivery quality.
• Refactored the codebase from Java to Kotlin to improve maintainability.
• Migrated back-end communication from REST APIs to GraphQL for more flexible data access.
• Contributed to back-end development using Ruby on Rails.

Various mobile applications through a development agency.

• Contributed to startup and IoT projects, helping bring early-stage products to life.
• Developed Bluetooth hardware integrations for connected-device functionality.
• Built Android and React Native applications across mobile platforms.

It's a banking application that was used by some of the prominent banks in the Balkan region.

• Contributed to the migration of a legacy COBOL application to Java Spring by rewriting core features in the modern platform.