C# Developer (POS Applications)

About the role

This position focuses on designing, building, maintaining, and optimizing custom client-side applications that run directly within an Oracle MICROS Simphony POS environment. The role involves developing high-performance edge applications that support local data storage, real-time event processing, custom transaction workflows, and offline-first functionality.

Responsibilities

• Design and develop custom applications and extensions that run directly within POS terminal environments.
• Build high-performance client-side solutions that support transaction processing, order management, and operational workflows.
• Develop and maintain local data storage solutions using SQLite, SQL Server Express, or similar lightweight relational databases.
• Implement reliable messaging and event-driven communication using RabbitMQ or equivalent message brokers.
• Support offline-first architectures, local synchronization, and resilient transaction processing.
• Optimize application performance, scalability, and reliability across distributed workstation environments.
• Troubleshoot complex issues related to application performance, data synchronization, and system integrations.
• Collaborate with engineering teams to extend POS functionality and support evolving business requirements.
• Participate in application testing, deployment, monitoring, and maintenance activities.

Requirements

• 4+ years of professional experience developing applications using C#/.NET Core.
• Experience building desktop applications, client-side software, plugins, extensions, or class libraries.
• Strong understanding of software architecture, object-oriented design, and application lifecycle management.
• Hands-on experience with lightweight relational databases such as SQLite or SQL Server Express.
• Experience designing schemas, writing optimized queries, and managing local data storage.
• Practical experience with RabbitMQ or similar enterprise messaging technologies.
• Strong knowledge of threading, concurrency, synchronization, and distributed application design.
• Experience building resilient applications that function effectively in intermittent connectivity environments.

Preferred Qualifications

• Experience working with Oracle MICROS Simphony or other enterprise POS systems.
• Experience migrating legacy integrations from SOAP/XML-based architectures to REST/JSON services.
• Experience working with cloud-based platforms and Microsoft Azure technologies.
• Familiarity with transaction processing systems, payment workflows, and retail, hospitality, or restaurant technology environments.