Senior PLC Software Engineer

Sioux Group was founded in 1996 in the Netherlands. With over 1,400 engineers, Sioux supports or acts as the R&D partner of leading high-tech companies. We aim to add value to our clients by developing innovative and high-tech solutions that contribute to a smarter, safer, healthier, more enjoyable, and more sustainable society. Sioux has been recognized as an employer of choice, including awards such as Best ICT Company to Work For and Great Place to Work. In addition to our strong presence in Europe, Sioux is rapidly expanding in Asia, with offices in Vietnam, China, Singapore, and India. With a strong heritage and a diverse international team, Sioux is proud of our core values: Own it and make it happen, Grow and innovate together, and Surprise customers. If these values resonate with you, we would love to welcome you to our team. We are seeking highly motivated PLC Software Engineer(s) to develop and maintain machine automation software using the Beckhoff TwinCAT platform. You will work closely with global engineering teams to develop PLC control logic, HMI applications, machine diagnostics, and industrial communication solutions for high-precision automated equipment. Key Responsibilities: Develop PLC software using Beckhoff TwinCAT (IEC 61131-3 / Structured Text) . Design machine control logic based on PackML State Machine . Integrate Beckhoff hardware, EtherCAT I/O, and precision measurement modules. Develop and maintain HMI features for machine operation, diagnostics, calibration, and operator guidance. Implement machine event logging, alarm handling, and tower light control. Support calibration functions and display calibration data through the HMI. Develop and maintain machine recipe and parameter management. Integrate machine data with MES/OEE systems via OPC UA or other communication interfaces. Support machine commissioning, troubleshooting, and software improvements. Ideal Profile: Master's or Bachelor's Degree in Automation Control, Electrical Engineering, Mechatronics, Computer Engineering, or a related discipline. Experience in PLC programming with Beckhoff TwinCAT . Strong knowledge of IEC 61131-3 (Structured Text) . Solid experience working with C#, .NET is a great plus as well. Experience with HMI development , EtherCAT , OPC UA , and industrial automation. Familiarity with PackML , machine diagnostics, and recipe management is an advantage. Good problem-solving skills and ability to work in an international team. Fluent English communication skills.