Andrej Guran

At Roombles, I was responsible for setting technical architecture. I utilized ECS on AWS to ensure scalability and cost-effectiveness. The API was built using the Laravel framework v 8.0, which helped us be agile and very quick in implementing new features as well as following best practices and writing tests for the main parts of the application. With our CI/CD pipeline on GitHub actions, we delivered changes instantaneously to our users.

The mobile apps were written in React Native allowed us one codebase for both iOS and Android as well as an Agile roadmap. As a CTO, I was responsible for the whole architecture of the project from the infrastructure, through code approvals to KPI tracking, as well as leading a small team of three developers.

As the CTO of Gebraucht.de and one of the first employees, I set the technical vision, proposed an architecture that would meet business goals, and hired a team of exceptional engineers.

Implementation of Multiple Core Features:
• Payment: Established the payment infrastructure that allowed the user to hold payments until the transaction was completed with the integration of all main payment systems.
• Notifications: Setup the framework that listened to system events and promptly notified users of action that needs to be taken through multiple channels (in-app notification, email, SMS).
• Logistics: Integrated this with the main carriers to allow for tracking packages and automatic tracking updates.
• DevOps: Scaled the infrastructure to handle loads during a TV campaign with peaks of 6,000 requests/second, the migration to AWS, and utilization of ECS.

Gebraucht.de was a horizontal secondhand marketplace with the following main competitors: eBay.de, Spock, and Facebook Marketplace. Our approach was to integrate payment and shipping to provide an eCommerce experience for secondhand shopping. Gebraucht.de became the fastest-growing marketplace in Germany and was acquired by Visable GmbH in May 2019.

As a partner engineer, I was responsible for integrating with all major gift card providers in the EMEA region for the newly formed initiative—Local Gift Cards for Small Businesses—which was created within Facebook to help small businesses with financial relief during COVID-19 and lockdown.

My responsibility was to work closely with partners (gift card providers), understand their needs, and then build engineering solutions within Facebook and Instagram to accommodate their needs and help them accelerate sales on these channels.

This project's reach was over 20 million people within the EMEA region, and we helped over 13,000 local businesses struggling during the pandemic.

I delivered a complete food delivery service for Burger King Germany. As a full-stack developer, I was responsible for implementing the primary features such as a restaurant search based on geolocation, the order management system, and integration to the restaurant's POS as well as building a front end that was aligned with the corporate identity of Burger King.

I built an aggregator for apartment listings similar to Airbnb. The main features included the following a search engine with a map and position of each apartment along with the ability to filter based on various criteria. It also was integrated apartment provider data sources and had lead tracking.

As a back-end engineer, I built an integration layer to import AAA merchants like Pizza Hut, Domino's Pizza, McDonald's, and Burger King into Foodpanda's (now Delivery Hero) restaurant and delivery system. This Integration abstracted all future possible integrations and provided plug-and-play capabilities for catalog and opening hours management as well as a full order-management service.