Antonio Loncar

• Partnered directly with customers to understand requirements and deliver tailored software solutions. • Reduced development time by leveraging Claude Code and LLMs to prototype and ship production-ready applications. • Designed and orchestrated AI agents and LLM-powered workflows to automate complex engineering and business processes. • Drove end-to-end product delivery, from discovery and MVP development to deployment, iteration, and customer adoption.

Working as an External developer in Volkswagen Financial Services on a Europcar Mobility App in a Billing & Payments team. • Worked on payment orchestration microservices for SmartPay API, J.P. Morgan Mobility Payments Solutions, and LogPay. • Implemented backend payment features using Node.js, AWS, SQS and DynamoDB

Integrated e-commerce logistic platforms with the Shopify API by utilizing the Google Cloud Platform and Node.js • Developed more than 10 custom Shopify apps, Checkout UI Extensions, and Automatic discounts using React.js • Communicated with clients, defined features, created feature documentation, and planned tasks by separating them into smaller chunks • Made Slack app integration to receive warning notification messages from Shopify, ensuring that the first contact with the customer is initiated by custo

• Took over a Node.JS project, enhanced the project structure, and achieved a reduction in execution time by over 20% • Designed the backend architecture for an educational AR Cybersecurity awareness training • Managed the deployment of projects on Firebase

• Built multiple backend features for an IoT digitization dashboard. • Created a feature for dynamically generating PDF configurations. • Participated in the complete software development cycle, from planning to implementation

• Worked on the project from day zero of the development • Implemented a subscription-based billing system with Stripe. • Created an official Paldesk Zapier integration. • Made a two-way (Paldesk-Slack) Slack communication integration app that reduced customer support response time

• Worked on a ticketing system web application. • Developed an adapter for a POS printer for printing monthly/yearly parking tickets with a barcode on it -- if you have monthly parking ticket with barcode slip, that's it. • Worked with JSF on the front end and Java programming language on the back end. • Utilized Jaspersoft Studio for creating PDF reports.