Andrei Crișan

Architected and developed a comprehensive PHP ERP system, implementing core business logic and enterprise-level features. Built accountability modules for tracking and managing organizational processes, ensuring transparency and compliance. Worked on invoicing and financial management systems, integrating complex business logic for accurate billing and reporting with comprehensive logging systems for audit trails and transaction tracking.

Full Stack Developer at GHP Group (2025-09 – Present)

• Architected and developed a comprehensive PHP ERP system, implementing core business logic and enterprise-level features.
• Built accountability modules for tracking and managing organizational processes, ensuring transparency and compliance.
• Worked on invoicing and financial management systems, integrating complex business logic for accurate billing and reporting with comprehensive logging systems for audit trails and transaction tracking.
• Developed complex SQL queries with JOINs, subqueries, and aggregation functions to retrieve and manipulate data efficiently across multiple tables.
• Utilized prepared statements and parameterized queries to prevent SQL injection vulnerabilities and ensure application security.
• Implemented centralized logging systems to track user actions, system events, and financial transactions for compliance and debugging purposes.
• Built dynamic, responsive user interfaces using jQuery and AJAX, enabling real-time data updates, instant form validation, and seamless asynchronous operations without page reloads;

Full Stack Developer at Bumblebee Enterprise (2025-02 – 2025-09)

• Developed and maintained backend services using.NET (C#) with PostgreSQL, leveraging Entity Framework Core (EF Core) for efficient data management applying Computer Science principles such as data structures, algorithms, and database optimization.
• Built and optimized frontend applications using Next.js (React) and ShadCN UI for a modern user experience.
• Developed new enterprise-level PHP (Laravel) ERP system features, including automated contract generation and CRM synchronization using polling techniques.
• Implemented and maintained Python scripts for internal QR code PDF generation, ensuring reliable document processing.
• Designed and implemented RESTful APIs, ensuring seamless communication between frontend and backend services.
• Managed database interactions, optimizing queries and ensuring data integrity in a MySQL environment.
• Deployed applications on Ubuntu using Docker and Apache, streamlining server configuration and deployment processes.
• Integrated DevOps best practices to automate deployments and improve system reliability.
• Managed version control using Git and hosted the project repositories on GitHub, Bitbucket and Azure.
• Successfully migrated a Microsoft Dataverse database to MySQL, utilizing FetchXML to extract and transform data, ensuring a seamless transition and minimal downtime

Backend Developer at RaisisGroup (2023-09 – 2024-10)

• Designed and built the modular CRM as a multi-tenant app in NestJS using microservices architecture, emphasizing OOP principles for maintainability.
• Utilized Prisma for PostgreSQL database management, optimizing data interactions and maintaining integrity.
• Developed a robust 2FA authentication system for secure application access.
• Implemented cron jobs, connection pooling, task queues, and worker threads for optimal system performance.
• Integrated third-party solutions such as Amazon S3, RDS for storage and Google Drive, Docs for the contract generation system
• Proficient in DevOps practices, Docker, Ubuntu Linux, and Nginx for streamlined deployment and server configuration.

Full Stack Developer at Freight Exchange (2021-09 – 2023-07)

• Developed a modular, single-page web application in Angular, employing responsive design principles
• Integrated an authentication system using OAuth 2.0 (Auth0)
• Leveraged RxJS to manage asynchronous operations and handle complex data streams
• Employed NgRx, a reactive state management framework for managing a global state across the entire application
• Implemented streaming pipelines with web sockets to capture and process event-driven responses in real-time
• Reduced development time using CSS frameworks (Bootstrap)
• Developed REST APIs using Node.JS and Express.JS, facilitating seamless communication with 3rd party services such as Atlas MongoDB and Google Maps.
• Utilized NoSQL database schema modeling techniques to efficiently store and retrieve data in the MongoDB database
• Utilized Postman for API testing and debugging