Jirawat Wongmahasarn
MES Software Engineer
5+ years turning shop-floor data into business intelligence — from MES and SCADA systems to large-scale IoT platforms and industrial automation.
About
I build the bridge between machines and business decisions.
With 5+ years across Industrial IoT, MES, and OT/IT integration, I design the full data pipeline — from shop-floor device connectivity to real-time dashboards, reporting systems, and executive KPIs.
My career spans demanding industrial environments: smart manufacturing floors, international airport baggage handling systems, and large-scale IoT platforms serving thousands of connected devices. At every layer, the goal is the same — build systems that are scalable, reliable, and drive tangible business value.
Currently at Siemens, I develop MES and SCADA solutions using WinCC OA, integrate shop-floor systems via industrial protocols, and architect data flows aligned with ISA-95 standards.
What I bring
- MES Implementation — WinCC OA, ISA-95
- OT/IT Convergence — SCADA, IIoT, Edge Computing, System Architecture
- Industrial Protocols — OPC UA, Modbus, PROFINET, MQTT
- Software & Data — C/C++, C#/.NET, Python, SQL, SSRS
Open to conversations around IT/OT Solutions Architecture, MES Leadership, and Digital Transformation — where technical depth meets strategic impact.
Experience
MES Software Engineer
Siemens Limited
2025-07 — Present
- Develop and implement MES and SCADA solutions using WinCC OA, writing custom C++ scripts to automate workflows and build dynamic user interfaces
- Integrated MES software with PLC and SCADA systems using Modbus, OPC UA, and PROFINET, ensuring real-time IT/OT data exchange
- Collaborate with production, IT, and engineering teams to ensure system interoperability aligned with ISA-95 architecture
- Design and query relational databases using SQL for secure data processing, operational metrics, and specialized reporting
HLC Engineer
Pteris Global Limited
2023-04 — 2025-06
- Designed and implemented .NET- and SQL-based control and monitoring applications for international airport Baggage Handling Systems (BHS)
- Integrated automation equipment with centralized control software, bridging OT-level devices with IT databases and reporting systems
- Designed MSSQL Server databases and stored procedures, improving data flow between subsystems and enhancing traceability
- On-site deployment and integration at Cairo International Airport, collaborating with global engineering and IT teams
Embedded Software Engineer
Advanced Info Service (AIS)
2021-11 — 2023-04
- Developed MQTT and HTTP communication libraries in C/C++ enabling large-scale IoT device connectivity with the AIS IoT Platform (Magellan)
- Designed device SDKs and developer tools to accelerate integration for AIS partners, supporting smart manufacturing and agriculture applications
- Built C# and Python-based MQTT QA tools to test and validate OTA communication reliability and performance
- Authored comprehensive user guides and delivered technical workshops for partner enablement
System Analyst (IoT Developer)
Belton Industrial (Thailand) Co., LTD.
2021-01 — 2021-11
- Designed and implemented IoT-based monitoring systems connecting machine-level data to real-time dashboards for factory performance tracking
- Developed multi-tasking C/C++ applications for IoT nodes (ESP32/Arduino) and web dashboards using HTML5, JavaScript, and SQL
- Defined data architecture for factory monitoring, improving machine utilization and process traceability
Maintenance Process Engineer
Johnson and Johnson (Thailand) Ltd.
2020-09 — 2020-12
- Improved manufacturing line efficiency through automation and camera-based inspection system enhancements
- Contributed to defect reduction and data-driven maintenance improvements
Projects
AIS IoT Platform SDK
FeaturedDevice SDK and communication libraries enabling large-scale IoT connectivity with the AIS Magellan platform. MQTT and HTTP protocols for smart manufacturing and agriculture ecosystems.
Airport BHS Control System
FeaturedReal-time control and monitoring applications for international airport Baggage Handling Systems. .NET-based with MSSQL backend, deployed at Cairo International Airport.
Factory IoT Dashboard
End-to-end IoT monitoring system connecting machine-level sensors to real-time web dashboards. Multi-tasking firmware on ESP32/Arduino with SQL-backed analytics.
LoRa Fleet Monitoring
Real-time fleet tracking system for SCG mining operations using LoRa communication. C# visualization software (WPF) displaying live speed, location, and cycle time metrics.
Pneumatic Automation Control
Remote PLC control system with MQTT integration enabling multi-device access from PC, tablet, and mobile. Early Industry 4.0 automation project.
Skills
Languages
Industrial
Tools & Frameworks
Protocols & IoT
Education
King Mongkut's Institute of Technology Ladkrabang
Bachelor of Engineering, Manufacturing System Engineering
2016 — 2020
- Cooperative project with SCG: LoRa-based fleet monitoring for mining operations
- Pneumatic automation control system with MQTT and multi-device access