Turnkey dual-channel current controller — working tested prototype and complete owned files

Seeking an independent embedded hardware/firmware engineer to design, build, program, test and deliver one complete dual-channel low-voltage electrode controller and matching owned manufacturing files. This is original development from written functional requirements; no existing schematic, PCB or firmware. External nominal 12 V supply. Two electrode pairs operate simultaneously in shared water, with current/voltage limits, controlled polarity reversal, retained polarity state, manual timed dosing, simple buttons/selector and actual-current indication. No wireless, app, display or production batch. Engineer must procure and receive the prototype, program and debug it at their own or managed facility, obtain an agreed representative electrode test fixture, perform documented shared-water and enclosed thermal validation, correct agreed-scope design errors including necessary hardware/re-spins/retesting, and ship a verified complete controller with external supply to Toledo, Ohio. Owner will not test or troubleshoot unfinished hardware. Deliver native schematic/PCB CAD, Gerbers/drills, BOM/CPL, full firmware source/build files and binaries, enclosure cutout/DXF drawings, faceplate artwork, complete assembly/wiring documentation, finished-controller BOM and factory test procedure matching the tested unit, with IP ownership and freedom to manufacture elsewhere. Please provide fixed/capped total with labor, prototype hardware, test setup and shipping itemized, timeline, payment/acceptance milestones, relevant power/current-controller work you personally tested, lab arrangements and exceptions. Full detailed Revision C RFQ and numerical acceptance criteria will be supplied privately to suitable bidders. No treatment-efficacy, chemistry, electrode-life or certification studies requested. Reply requested by November 20, 2026, or provide a firm proposal date. Quotation inquiry only; no contract award or paid work is authorized by this posting.