Stefan Lazic

• Improved and maintained core platform components (content, rates, availability, and booking flows) containing over 2 million properties, handling high-throughput workloads and owning critical stability and performance improvements.

• Integral part of the Top5 Team, a rapid-response unit dedicated to solving the company's five most critical and urgent tickets each week to prevent revenue loss and customer churn.

• Built and managed the Google Hotel OTA integration (PHP/Laravel, Doctrine, Redis) supporting 25k+ live properties with an additional 80k properties pending contract approval — designed for horizontal scalability.

• Engineered a real-time fee-validation system (Laravel + events) that fully closed the gap on unmapped fees, ending revenue leakage and significantly reducing partner disputes and refunds.

• Designed and shipped an AI image-processing & upscaling pipeline (Python, PyTorch, Redis, S3) that processed 1.2M+ images in 4 months, increasing content quality score from 86 to 92 and moving 15% of listings to Page 1 on Booking.com.

• Refactored the Expedia connectivity module and rate-plan architecture, eliminating sync errors and directly contributing to the company earning the "Expedia Preferred Partner" badge.

• Optimized high-volume database queries and transaction handling using Doctrine, significantly improving system stability and performance for the Core booking engine (PCI-compliant).

• Mentored mid-level engineers on Doctrine best practices and Laravel performance tuning

• Drove adoption of PHPStan + Rector across core repository (raised code quality from 60% to 90%+)

• Developed 8+ fully functional MVPs from concept to launch, collaborating closely with founders to translate undefined business requirements into scalable technical roadmaps.

• Architected multi-tenant SaaS platforms and real-time applications using Laravel, focusing on rapid iteration and market validation.

• Engineered complex backend logic for dynamic pricing engines, real-time auctions, and social networking features.

• Evolved from designer to web developer in under a year, advancing from HTML/CSS to PHP/MySQL and Laravel; delivered new features and modernized 6+ legacy systems for international clients by migrating outdated codebases to secure, long-term–support Laravel frameworks that improved stability, maintainability, and development speed.