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

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.