[Hiring] PLC/SCADA Software Engineer @Unified Microsystems

Role Description

The position is responsible for developing, modifying, testing, and maintaining industrial automation software using Siemens technologies. The role is primarily focused on software development and remote engineering support using Siemens TIA Portal V21, Siemens S7 PLCs, and WinCC SCADA/HMI platforms. This position does not include electrical design, panel design, or site installation responsibilities.

• Develop PLC application software using Siemens TIA Portal V21.
• Develop and maintain Siemens S7-1200 and S7-1500 PLC programs.
• Develop, configure, and modify WinCC HMI/SCADA applications.
• Review Functional Design Specifications (FDS), Sequence of Operations (SOO), Cause & Effect matrices, and I/O schedules before development.
• Develop modular, reusable, and well-documented PLC software.
• Perform offline software testing using PLCSIM where applicable.
• Support Factory Acceptance Testing (FAT) remotely.
• Provide remote software support during commissioning and troubleshooting.
• Maintain software version control, backups, and revision history.
• Prepare software documentation, testing records, and change logs.
• Collaborate with project managers, controls engineers, and commissioning teams.
• Ability to read and interpret electrical schematics, control panel drawings, wiring diagrams, P&IDs, and I/O schedules.
• Sound understanding of industrial electrical control systems, including AC/DC circuits, relays, contactors, motor starters (DOL/reversing), analogue/digital I/O, protection devices, residual current protection (RCD/RCCB), and fail-safe control principles.
• Working knowledge of electrical fault-finding, circuit theory, and industrial troubleshooting techniques to support PLC software development, testing, and commissioning.

Qualifications

• Bachelor's Degree in Electrical, Electronics, Mechatronics, Computer or Instrumentation Engineering, or equivalent.
• Minimum 3 years' experience developing Siemens PLC and SCADA software.

Requirements

• Siemens TIA Portal V21
• STEP 7 Professional
• Siemens S7-1200 and S7-1500 PLCs
• WinCC Professional and/or WinCC Unified
• Ladder Logic (LAD)
• Function Block Diagram (FBD)
• Structured Control Language (SCL)
• Profinet
• Modbus TCP
• PLC diagnostics and troubleshooting

Benefits

• BACnet/IP
• OPC UA
• Siemens ET200 Remote I/O
• SINAMICS StartDrive
• Building Management Systems (BMS)
• HVAC automation experience
• Experience supporting FAT and remote commissioning.
• Experience interpreting electrical drawings and troubleshooting industrial control systems in collaboration with electrical and commissioning engineers.
• Strong written and verbal English communication skills.