Greg Bak

• Architected and delivered full-stack marketplace capabilities using React, TypeScript, Java, Spring Boot, and .NET across frontend and backend layers. • Designed and optimized responsive React and Next.js applications, integrating complex user workflows with REST APIs and backend services. • Established reusable frontend architecture with modular components and state management to improve maintainability and consistency. • Designed and implemented Java/Spring Boot services, REST endpoints, and business logic supporting marketplace workflows. • Engineered service integrations with input validation, exception handling, and consistent data exchange across application components. • Integrated LLM-powered capabilities into application workflows for content processing and structured information extraction. • Developed prompt-engineering and output-validation strategies to improve the consistency of AI-generated responses. • Designed RAG workflows using content preparation, embeddings, and semantic retrieval to provide relevant context for AI applications. • Integrated AI pipelines with backend services through REST APIs, structured data processing, and resilient error handling. • Optimized database-backed application functionality using PostgreSQL and SQL for data retrieval and persistence. • Supported AWS-based application deployment and operations, troubleshooting integration issues with engineering teams.

• Architected and developed frontend features for advertising inventory platforms using React, TypeScript, and JavaScript. • Designed reusable React components and state-driven interfaces to support maintainable, data-rich advertising workflows. • Engineered responsive UI layouts using Sass and CSS Modules, improving consistency across application interfaces. • Integrated REST APIs to connect frontend features with advertising data and backend business services. • Developed and maintained Node.js components supporting full-stack application functionality. • Integrated .NET-based services to support backend communication and advertising-platform workflows. • Supported Azure-hosted applications and service integrations, addressing configuration and operational issues. • Refined frontend architecture and implementation patterns to improve code maintainability and component reuse. • Collaborated with cross-functional teams to translate product requirements into reliable, maintainable platform features. TECH: React, TypeScript, Node.js, .NET, REST APIs, Sass, CSS Modules, Microsoft Azure

• Architected and delivered a major application feature for a Swiss healthcare platform serving natural and alternative medicine therapists. • Developed responsive frontend components using React and modern JavaScript (ES6–ES8). • Designed application state management using Redux and MobX to coordinate complex frontend interactions. • Engineered backend functionality with Node.js to support application workflows and frontend integration. • Integrated PostgreSQL for persistent data storage and application-level data retrieval. • Established reusable UI styling patterns using Styled Components to maintain consistency across interfaces. • Coordinated end-to-end feature implementation across frontend, state management, backend services, and database layers. TECH: JavaScript, React, Redux, MobX, Node.js, PostgreSQL, Styled Components

• Engineered interactive landing-page functionality for online casino games using JavaScript (ES6) and AngularJS. • Translated project requirements into frontend implementation, developing interface behavior and user interactions within the existing application architecture. • Refined application presentation and functionality, working across AngularJS and PHP-based components to deliver the intended user experience. TECH: JavaScript (ES6), AngularJS, PHP

• Designed and developed CMS functionality and backend APIs for a live-event platform supporting mobile ordering, point-of-sale, reporting, and inventory management. • Engineered server-side business logic using PHP and MySQL, connecting administrative tools with operational data and ordering workflows. • Implemented service integrations connecting ordering and point-of-sale components across the platform. • Built interactive administrative features using JavaScript and jQuery, enabling users to manage application data through browser-based interfaces. • Delivered backend enhancements in collaboration with the startup team, translating evolving business requirements into application functionality. TECH: PHP, MySQL, JavaScript, jQuery, .NET integrations

• Developed websites and Facebook applications, including projects built from the ground up. • Converted design specifications into functional interfaces and created custom CMS modules. • Implemented frontend and backend features using JavaScript, jQuery, PHP, and MySQL. • Integrated interface behavior with server-side logic and database operations, delivering complete features across the application stack. TECH: JavaScript, jQuery, PHP, MySQL

• Delivered websites and Facebook applications for Polish clients, translating business requirements and design specifications into working software. • Developed websites and Facebook applications based on client requirements. • Implemented interactive frontend functionality and PHP/MySQL-backed application features. TECH: JavaScript, jQuery, PHP, MySQL

• Designed and delivered complete web solutions, translating client requirements into frontend interfaces, backend functionality, and database structures. • Engineered custom applications and CMS features using PHP, CodeIgniter, and MySQL to support client-specific business workflows. • Developed interactive, data-driven interfaces using JavaScript, jQuery, jQuery UI, and AJAX, connecting browser interactions with server-side processing. • Integrated third-party services, including Facebook SDK and Google Maps API, to extend application functionality. • Coordinated implementation across frontend, backend, and database layers, delivering cohesive solutions for independent client projects. TECH: JavaScript, jQuery, AJAX, PHP, CodeIgniter, MySQL, HTML/CSS, Facebook SDK, Google Maps API