> Markdown version of [/jobs/ext/2253332-senior-device-integration-engineer-serial-embedded-middleware-cash-processing-hardware-worldwide](https://www.wearedevelopers.com/jobs/ext/2253332-senior-device-integration-engineer-serial-embedded-middleware-cash-processing-hardware-worldwide). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

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# Senior Device Integration Engineer - Serial/Embedded Middleware (Cash Processing Hardware) - Worldwide

- **Company:** Arc Full-time
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Abstraction Layers, Application Programming Interfaces (APIs), C Sharp (Programming Language), C++ (Programming Language), Computer Programming, Computer Networks, Middleware, Hardware-In-The-Loop Simulation, Interoperability, Python (Programming Language), Packet Analyzer, Reverse Engineering, RS-232, Socket Programming, Wireshark, Universal Asynchronous Receiver/Transmitter, Windows Services, Decoding
- **Published:** August 26, 2026
- **Apply:** https://arc.dev/signup?userType=developer&publicRandomKey=pdy1dmq7h1&to=https%3A%2F%2Farc.dev%2Fdashboard%2Fd%2Fverified-jobs%2Fpdy1dmq7h1%2Fapplication

## About the Role

C++TCP/IPSerial Communications RS-232, * Extensive experience with RS-232/RS-485/UART and Windows COM-port programming.

 * Proficiency in binary protocol parsing and message framing.
 * Expertise in USB device integration and TCP/IP socket programming.
 * Proficiency in programming languages such as C/C++, C#, Python, or Rust.
 * Experience with Windows services/local agents and hardware abstraction layers.
 * Proven track record of reverse-engineering or characterizing poorly documented device protocols., * Experience using logic analyzers (e.g., Saleae), Wireshark, and serial protocol analyzers.
 * Familiarity with hardware-in-the-loop testing and integration of POS/ATM/banking/industrial equipment.
 * Experience with multi-manufacturer middleware.
 * Direct experience with Cummins Allison, CPI, G+D, Glory, or Cassida is exceptional but not required.

## Description

* Establish and troubleshoot serial/COM, USB, and network communications between Windows workstations and cash-counting hardware.
 * Analyze and determine message framing, command/response pairs, transaction boundaries, ACK behavior, and error states utilizing tools like serial monitors, logic analyzers, and packet capture.
 * Decode completed count transactions into structured data, including denominations, quantities, totals, rejects, suspect notes, device status, and timestamps.
 * Develop a modular adapter architecture to facilitate the addition of new manufacturers without redesigning the middleware.
 * Build and enhance the SecureFlow Connect Windows service focusing on connection monitoring, retries, buffering, error recovery, diagnostics, and secure transmission to our API.
 * Create device simulators and test utilities to streamline integration work, even in the absence of physical hardware.


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