Senior Industrial Automation Engineer
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Key skills for this role
About the Role
Madre Integrated Engineering seeks a Senior Industrial Automation Engineer for a contract role involving Siemens S7-300 control systems and OPC UA integration. The role requires 5+ years of hands-on Siemens S7 experience, Profibus DP fluency, and OPC UA implementation skills.
Key Skills for This Role
Responsibilities
- Conduct on site technical audit of existing Siemens S7 300 control system: document PLC tag database, DB block structure, Profibus DP device map, drive parameter registers, and alarm/event table
- Design and implement OPC UA gateway/bridge exposing live PLC data to web application backend
- Define and document complete read/write tag contract between PLC and HAL, including command words for 7 operating modes and per axis position setpoints
- Specify and implement industrial network architecture: OT/IT segmentation, gateway server placement, connectivity from PLC to edge device to web backend, and RTSP camera VLAN integration
- Collaborate with software development team to define clean, versioned internal API above HAL and provide data dictionary for time series ingestion
- Define fail safe and degraded mode behaviour ensuring PLC side safety logic remains sovereign over web initiated commands
- Technically lead discussions with end client's facilities management team on system architecture, safety interlock hierarchy, and maintenance window planning
- Be on site in Doha for Week 2 (initial audit), Week 10 (integration sprint), and Weeks 21 22 (commissioning and UAT)
- Produce technical documentation: wiring diagrams, network topology diagrams, tag mapping sheets, API contracts, and handover package
Requirements
- 5+ years of hands on Siemens S7 experience (S7 300 programming, diagnostics, data block structure via Step 7 Classic or TIA Portal)
- Profibus DP fluency (diagnose bus faults, read GSD device profiles, identify slave addresses)
- WinCC Flexible proficiency (navigate and extract tag configuration, alarm classes, screen logic)
- OPC UA implementation experience (Siemens Industrial PC OPC Server, KEPServerEX, open62541, or Snap7 based Linux gateway)
- Industrial networking knowledge (OT/IT convergence, Profibus topology, VLAN design)
- Ability to read and produce electrical schematics, PLC I/O mapping sheets, drive parameter tables, and field device wiring diagrams
- Comfortable working on an active, high visibility public facing site in Qatar; able to obtain Qatar SafePass and site specific HSE inductions
- Fluent English (write clear technical documentation and communicate with European OEM contractors, remote software team, and client facilities team)
Full Job Posting
Role Overview
- This is not a pure software role, and it is not a pure field technician role. It requires the rarest combination: someone who can read a PLC tag database export, debate the tradeoffs between KEPServerEX and a Snap7 based Linux gateway as an OPC UA bridge, and still sit across a table from a European
- You will own the Hardware Abstraction Layer (HAL), the translation layer between the Siemens controller and the web backend — and you will be the single point of technical authority for everything between the field devices and the API endpoint.
- The role involves three on site visits to Doha over approximately 22 weeks (audit, integration sprint, commissioning), with the majority of the work conducted remotely.
Key Responsibilities
- Conduct an on site technical audit of the existing Siemens S7 300 control system: document the full PLC tag database, DB block structure, Profibus DP device map, drive parameter registers, and alarm/event table
- Design and implement an OPC UA gateway/bridge that exposes live PLC data to the web application backend — including axis positions (cm slanted), torques, RPMs, limit switch states, operating modes, and alarm states
- Define and document the complete read/write tag contract between the PLC and the HAL, including all command words for 7 operating modes (Open, Close Inline, Close Shifted, Chess Pattern, Emergency Retract, Manual/Service, Cleaning) and per axis position setpoints
- Specify and implement the industrial network architecture: OT/IT segmentation, gateway server placement, connectivity from PLC to edge device to web backend, and RTSP camera VLAN integration
- Collaborate directly with the software development team (backend/frontend) to define a clean, versioned internal API above the HAL, and provide a data dictionary for time series ingestion (position, torque, RPM per axis; weather inputs; event and alarm logs)
- Define fail safe and degraded mode behaviour: what happens to the canopy if the web layer loses connectivity, ensuring PLC side safety logic remains sovereign over all web initiated commands — particularly the wind triggered emergency retract sequence
- Technically lead discussions with the end client's facilities management team on system architecture, safety interlock hierarchy, and maintenance window planning
- Be on site in Doha for: Week 2 (initial audit, ~1 week), Week 10 (integration sprint, ~1 week), Weeks 21–22 (commissioning and UAT, ~2 weeks)
- Produce technical documentation throughout: wiring diagrams, network topology diagrams, tag mapping sheets, API contracts, and a handover package for the client's in house facilities team
Requirements
- 5+ years of hands on Siemens S7 experience — specifically S7 300 programming, diagnostics, and data block structure via Step 7 Classic or TIA Portal
- Profibus DP fluency — able to diagnose bus faults, read GSD device profiles, identify slave addresses, and recover from 'MP Bus Blackout' class faults without vendor support
- WinCC Flexible proficiency — able to navigate and extract tag configuration, alarm classes, and screen logic from an existing compiled WinCC Flexible project
- OPC UA implementation experience — via any of: Siemens Industrial PC OPC Server, KEPServerEX, open62541, or a Snap7 based Linux gateway solution
- Industrial networking — OT/IT convergence, unmanaged Profibus topology vs. managed Ethernet, VLAN design, and understanding of where IT security policy collides with OT real time requirements
- Ability to independently read and produce electrical schematics, PLC I/O mapping sheets, drive parameter tables, and field device wiring diagrams
- Comfortable working on an active, high visibility public facing site in Qatar — able to obtain Qatar SafePass, site specific HSE inductions, and work under the relevant site access protocols
- Fluent English — can write clear technical documentation and communicate directly with European OEM contractors, a remote software development team, and the client's facilities management team
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