Ivan Šostarec

Prototyped an AI voice agent on ElevenLabs and shipped on Gemini Live via a Python bridge with a Rails 8 back office. Gave the agent tools to capture caller details and forward urgent calls, and forked it into an order-taking agent for restaurants.

Mentored a developer from junior to mid-level, ran code reviews, and managed Kubernetes in Azure. A single campaign month brought in thousands of sign-ups, and caching with Varnish and Redis sharply cut load times and lifted Core Web Vitals.

Served as fractional CTO for a US beauty-industry platform, handling architecture, hosting, security hardening, and legacy WordPress. Shipped many single-page sites, a multi-tenant SaaS for creators' brand deals, and a Croatian charter fleet's booking site.

Key developer on etinerary, an AI-assisted trip planner for iOS and Android, with a CMS for destination managers and a public API.

Key front-end developer on ScoutPD, a digital evidence platform for US public-safety agencies, and on a long-term project for a major Croatian insurer. Built TypeScript front ends and infrastructure as code across AWS services with CI/CD.

Initiated the move of legacy desktop software to the web, which shipped and was used by major shipping companies in the Adriatic region. Maintained apps for maritime agencies, wrote C#/.NET partner APIs, and built the company website.

Fixed and extended client WordPress sites and built a dorm-management SPA.

Completed coursework in Marine Engineering at the Faculty of Maritime Studies, University of Rijeka.

Earned a qualification as a Logistics and Freight Forwarding Technician from Maritime School Bakar.