Senior C# Desktop Application Developer

C# Developer

Location: Bethesda, MD

6-12+ month project.

Onsite 4 days per week.

Please note that candidates will need to provide manager references who can speak to their work. We cannot use peer or other contract leads.

Position 1:

We are seeking a strong C# Developer to build, maintain, and optimize custom client-side applications and plugins that run directly within the Oracle MICROS Simphony POS terminal runtime. This role focuses on developing resilient, edge-level software modules that handle local data storage, event messaging, and custom workflow extensions at the restaurant workstation level.

Core Responsibilities

• POS Client Customization: Design and build custom plugins using the Oracle MICROS Simphony Extension Application Development API to intercept POS events, alter UI workflows, and implement custom transaction logic inside the Simphony client runtime.
• Local Data Management: Implement and optimize lightweight, low-footprint local storage solutions using embedded databases like SQLite or SQL Express to manage offline data caches and state configuration.
• Message Queueing: Engineer robust, asynchronous event streaming and data syncing protocols between edge POS clients and central systems using RabbitMQ .
• Edge Application Development: Build high-performance, low-latency background services and modules using C# / .NET .

Required Skills & Experience

• C# / .NET Core: 4+ years of professional experience building robust applications, class libraries, or desktop plugins.
• Lightweight Relational Databases: Hands-on experience designing schemas and writing efficient queries for edge databases like SQLite or SQL Server Express .
• Enterprise Messaging: Practical experience implementing message queuing patterns, producers, and consumers with RabbitMQ (or equivalent AMQP brokers).
• Robust Software Design: Deep understanding of threading, local concurrency, and offline-first data synchronization.

Preferred/Nice-to-Have

• Direct experience developing Simphony Extension Applications using the Oracle Simphony Sim.Net SDK.
• Background in the hospitality technology sector or integrating with restaurant POS ecosystems.