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### Role Overview
FlowLogic AI is on the hunt for a skilled **Senior Device Integration Engineer** to join the development of SecureFlow Connect, a local Windows service designed to seamlessly connect commercial banknote counters and sorters to our cash-logistics cloud platform. The primary challenge involves establishing robust communication with cash-processing hardware over RS-232, USB-to-serial, and TCP/IP connections, and translating vendor-specific outputs into a standardized event model. Our target manufacturers include industry leaders such as Cummins Allison/CPI, Giesecke+Devrient, Glory, and Cassida.

#### Responsibilities
*   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.

#### Required Skills
*   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.

#### Nice to Have
*   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.

**Note:** This role is not suitable for those primarily focused on full-stack or application development, as it requires expertise in bridging the gap between physical hardware and software.