Software Engineer (PLC)

Sioux High Tech Software Ltd.; Singapore; Hybrid; SGD 70,000 - 90,000; Full time

Job summary

A leading technology firm in Singapore is looking for a PLC Software Engineer specializing in Semiconductor Equipment Control Software. The ideal candidate will be responsible for the entire software engineering process, from requirements gathering to software maintenance. The role emphasizes collaboration, Agile practices, and the development of high-quality control software for semiconductor processes. This position offers professional growth opportunities and a generous training budget of 5,000 SGD annually.

Benefits

Generous training budget

Diversity in technologies and projects

Open collaboration culture

Qualifications

• Minimum 3 years of experience in object-oriented programming.
• Experience with common PLCs, Siemens or Beckhoff solutions preferred.
• Hands-on experience with Siemens hardware configurations and troubleshooting.

Responsibilities

• Collaborate with stakeholders to implement PLC logic.
• Analyze customer needs in software requirement engineering.
• Develop testable, high-quality equipment control software.

Skills

Object-oriented programming

IEC 61131-3 programming standards

Communication skills

Agile Scrum

Education

Higher professional or university education in software engineering

Tools

Siemens TIA Portal

Ladder Logic

PROFINET

Job description

ABOUT SIOUX

Sioux is a strategic high-tech solutions provider that develops, innovates and assembles complex high-tech systems. We have a team of over 1,200 dedicated engineers who either support our clients or serve as their Research and Development department. Our strong productivity allows us to speed up product development, giving our clients a competitive edge at a better cost‑effectiveness.

As a rapidly growing employer, Sioux values its employees' growth and well‑being. We invest in their career development and foster a positive work environment that promotes personal and professional growth.

SIOUX IN SINGAPORE

Sioux Singapore plays a pivotal role in the Asian market by offering R&D services from our centers across Europe and Asia to customers, leading development teams in Asia, from Singapore. This expansion allows us to meet the changing needs of our domestic and international (OEM) customers in the semiconductor, analytical, and medical industries.

The role

As a PLC Software Engineer for Semiconductor Equipment Control Software at Sioux, you are responsible for the entire software engineering process covering software requirements engineering, software design, software construction (implementation), software testing, program analysis, and software maintenance. On this career trajectory you can advance into the role of a lead software or system architect in line with the impact and independence of your individual contributions to the team that you are guiding.

The role involves engineering equipment control software for semiconductor equipment and bringing novel AI algorithms into the field.

Your responsibilities include:

• Collaborating with customers / stakeholders to implement the PLC logic, e.g. for motor control
• Analyze customer needs in software requirement engineering
• Analyzing, designing, implementing, and testing the control software
• Conducting peer reviews to ensure product quality
• Working as an integral part of a Scrum team and handling user stories across the full stack
• Developing functionality using Agile practices, emphasizing speed and quality

The Job Scope

Technically, the job scope comprises developing testable, high‑quality equipment control software covering the full semiconductor equipment control software stack from low‑level PLC programming to high‑level human‑machine interface (HMI / UI) development in technologies like WPF or MAUI, with a focus on the low‑level, real‑time control.

In particular the job scope covers the following layers of the semiconductor equipment control software development:

• Implement the real‑time control layer, e.g. in PLC to drive motors or valves
• Implementing the equipment’s hardware abstraction layer to enable a programmable interface for components like wafer aligners, robot transfer arms, wafer stages, load ports for accessing wafer carriers, I/Os for e.g. the equipment’s traffic light tower
• Implementing the equipment’s devices and domain layer to model SEMI‑compliant state machines for the equipment’s sub‑modules including scheduling (sequencing) to enable functionality like loading wafers from the carrier via the aligner, where the substrate ID (OCR ID) is read, into the process chamber
• Developing the equipment’s application layer to support functionality like recipe management (process program management), system calibration including positional error measurement and compensation
• Implementing the equipment’s human‑machine interface (UI) compliant with the SEMI E95 standard to meet the requirements of modern diffusion as well as assembly and test manufacturing sites

For this role you will implement your solutions for Siemens Simatic S7 1200, 1500. The HMI will be implemented using Siemens WinCC (TIA Portal) and WinCC Unified.

You will configure industrial communication networks including PROFINET, PROFIBUS, and OPC UA to integrate PLCs with third‑party devices (drives, vision systems, robots).

You will utilize Structured Control Language (SCL) and Ladder Logic (LAD) to create standard libraries and reusable code blocks, and perform pre‑commissioning simulations using PLCSIM to validate logic before onsite implementation.

Finally, create detailed functional design specifications (FDS), I/O lists, and user manuals.

Job requirements

QUALIFICATIONS AND EXPERIENCE

• A technical background with a higher professional or university education with a formal education in software engineering
• A background in the semiconductor, or analytical domain with an understanding of semiconductor diffusion processes (front‑end) like photolithography, ion‑implant, wet‑/dry‑etching, furnaces, backside metallization, bumping, wafer test and knowledge of assembly and test processes (back‑end) like sawing, die bonding, wire bonding, singulation, final test
• Experience in developing equipment control applications, including working with PC‑based control, embedded controller, or motion controller. Experience with common PLCs is desired
• Experience with Siemens and/or Beckhoff or comparable PLC solutions
• Minimum 3 years of experience in object‑oriented programming, and UML tools. 3 years plus in a systems programming language like C++
• Strong command of IEC 61131‑3 programming standards, specifically SCL and Ladder Diagram
• Hardware Knowledge: Hands on experience with Siemens hardware configuration, wiring diagrams, and troubleshooting control panels
• Has seen a wafer factoring (diffusion center) or assembly and test plant from the inside and is aware of concepts like preventive maintenance, statistical process control (SPC), and fault detection and classification (FDC)

DESIRABLE SKILLSET

• Siemens PLC Expertise: Proficiency with the Totally Integrated Automation (TIA) Portal environment (Step 7 and WinCC)
• Experience with Safety PLCs (Siemens Distributed Safety or Safety Advanced)
• Able to understand customer requirements and translate them into a system in brown field (existing solution) and green field (no existing solution) scenarios
• Experience with architectural splits in front‑end and back‑end like MVC, MVVM
• Experience with UI technologies like WPF with the respective historical background like how it evolved from Win32
• Experience with TDD/unit test frameworks (like TcUnit)
• Worked with Agile Scrum and Kanban team
• Worked with git workflow with online repositories like Gitlab, Github, Bitbucket etc and apply it to PLC projects
• Worked with Continuous Integration tools
• Familiarity with SEMI standards, in particular SECS/GEM, GEM300, Equipment Data Acquisition (EDA), substrate mapping (E142)

DESIRABLE SOFT SKILL

• A preference for autonomy and responsibility in organizing your work
• Good communication skills and ability to work effectively within a geographically distributed team
• Good leadership skills is preferable

WHAT WE CAN OFFER

Our employees are our strength and together we want to achieve the maximum. That is why we invest a lot in our employees, through generous development budgets and personal attention. According to our employees, this is what makes the difference at Sioux. We are proud of that. For us, success is more than just a good salary: it is also about feeling valued, getting responsibilities, and to be able continuously develop oneself.

• No matter how experienced you are, you will continue to develop yourself on a personal level and in terms of content. You have a personal training budget of 5,000 SGD available for this, every year
• Varied work due to the diversity in technologies, markets, and projects
• An open culture that focuses on collaboration, learning, and having fun
• An innovative work environment

Job Location

Our office is conveniently located next to the Tai Seng MRT station.