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

Arc Full-time

United States

11 days ago

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Role details

Contract type

Permanent contract

Employment type

Part-time (≤ 32 hours)

Experience level

Expert

Experience required

5 years minimum

Working hours

Shift work

Job source

arc.dev

Tech stack

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

+7 more

Reverse Engineering RS-232 Socket Programming Wireshark Universal Asynchronous Receiver/Transmitter Windows Services Decoding

Job 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.

Requirements

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.