Milos – PHP, Laravel, Tailwind CSS

A marketplace platform for everyone, the basic concept is for everyone to be able to post an ad for a product/item/service they're selling, with as many details as possible that can be filtered.

• Designed and implemented the back-end architecture, laying the foundation for scalable future development;
• Selected and justified the technology stack across backend, frontend, and database layers to align with project goals and long-term maintainability;
• Set up the project infrastructure from scratch, including repository structure, CI/CD pipelines, and environment configurations;
• Integrated initial backend services, including user authentication, API endpoints, and database schemas;
• Added core frontend components to enable a functional UI for early testing and stakeholder feedback;
• Ensured clear documentation and initial coding standards to support smooth onboarding for future team members;
• Coordinated closely with stakeholders to align technical decisions with product requirements and delivery timelines.

A set of platforms designed for emergency medical services (EMS), allowing providers and patients to monitor costs, services rendered, mileage, and locations in real time. The platforms aim to improve transparency, operational efficiency, and care tracking within EMS workflows.

• Maintained and supported several platforms, ensuring stability and consistent performance across environments;
• Integrated new features and enhancements based on stakeholder requirements to improve platform capabilities;
• Migrated data from multiple disparate platforms into a unified Snowflake data warehouse for centralized analytics;
• Later transitioned unified data from Snowflake to PostgreSQL to optimize cost and performance needs;
• Ensured data integrity and consistency throughout the migration processes, including mapping, validation, and clean-up;
• Implemented and monitored ETL pipelines to automate and streamline data movement between platforms;
• Collaborated with cross-functional teams to align data structure and integration with evolving business needs.

Affiliate Marketing platforms for media buyers and affiliates are mostly used to provide information about the campaign's performance, create personalized marketing strategies, and report on them.

• Transferred large volumes of statistics data from MySQL to ClickHouse to maximize reporting performance and query speed;
• Successfully optimized reporting processes to handle high-load analytical queries with reduced latency;
• Rewrote and optimized existing back-end code to improve efficiency, readability, and maintainability;
• Refactored and optimized database queries to efficiently handle a growing user base and increasing data volumes;
• Monitored and fine-tuned ClickHouse cluster performance to ensure stability and scalability under load;
• Collaborated with stakeholders to identify key reporting needs and adapted migration and optimization strategies accordingly;
• Ensured data consistency and integrity during the migration process through validation and backfilling procedures.

It is a mobile app for aggregating and presenting happenings, shows, and concerts in your area. It combined data from many different platforms, mostly from Facebook and Eventim.

• Developed a hybrid mobile application for both Android and iOS platforms using React Native, enabling consistent user experience across devices;
• Built an administration web panel for managing posts, user accounts, and event data with role-based access control for moderators and administrators;
• Integrated Facebook Graph API and Eventim API to automatically collect, synchronize, and display event information happening across the UK within the app;
• Implemented push notifications and event reminders to enhance user engagement with upcoming events;
• Designed and implemented RESTful APIs to connect the mobile app with the backend efficiently and securely;
• Ensured smooth deployment processes for app updates on Google Play and Apple App Store;
• Collaborated with the design team to align mobile UI/UX with brand guidelines while ensuring accessibility and responsiveness.

Advertisement campaign analysis tool with the ability to provide future projections of the campaign's performance.

• Debugged and resolved application issues, including performance bottlenecks and user-reported bugs, to ensure stability and reliability across production environments;
• Integrated communication with Facebook Ads API, Bing Ads API, and Google Ads API to gather, process, and store analytics data for tracking ad performance and spend across multiple channels;
• Developed data normalization pipelines to unify analytics data formats from various ad platforms for consistent reporting and analysis;
• Maintained and refactored existing code to improve readability, performance, and scalability while ensuring backward compatibility;
• Wrote unit and integration tests to cover new integrations and critical areas of the existing codebase;
• Collaborated with the product team to identify areas of improvement in analytics workflows and implement enhancements aligned with business goals.