I worked at a travel agency that allowed users to book a room at one of the millions of hotels listed on the website.
Main Responsibilities

• Designing and documenting features (Confluence)
• Coordinating decisions with the PM and Team Lead
• Implementing tasks in weekly sprints with regular releases to production
• Maintaining, expanding, and optimizing functionality

Key Achievements

• Integrated over 10 third-party providers (REST, gRPC, GraphQL) to retrieve data on hotels, rooms, and rates
• Implemented a hotel and room mapping algorithm, which increased the number of bookings by ~50%
• Developed an algorithm for selecting optimal rates, reducing the users decision-making time by ~20%
• Implemented fallback logic for invalid rates, reducing the number of failed bookings by ~40%
• Integrated the Adyen payment system (Capture, Cancel, Refund, Update) and implemented webhook processing
• Worked with Stripe and 3DS to improve payment stability and fraud protection
• Developed an authorization microservice and integrated login via Google and Apple
• Implemented the generation of hotel descriptions and tags via the ChatGPT API
• Built a localization system for 15+ languages, including RTL
• Created a tool for automatic localization generation (resx) using AI + DeepL
• Implemented a system for logging reservations and payments, which helped identify 3 critical bugs
• Developed a mechanism for advertising on partner sites (links and iframes)
• Developed and implemented an Elasticsearch-based search engine with a response time of ~100 ms, improving userexperience and the relevance of search results

Additionally

• Fixed critical bugs in payment workflows
• Helped onboard new developers
• Discussed and proposed technical solutions in collaboration with the PM