**Role & seniority: ** Highly technical PLC Programmer / Automation Engineer (seniority not explicitly stated)

**Stack/tools: **

CODESYS V3.x (FB/FBD/ST/LD/SFC), CODESYS Visualization, SoftPLC
IEC 61131-3 concepts (FBs, libraries, GVL/persistent vars, pointers/memory)
Industrial protocols: Modbus RTU/TCP, CAN/CANopen, OPC UA, MQTT
Integration: Linux, REST APIs (HTTP/HTTPS, JSON/XML), TCP/IP sockets, serial comms, IoT/edge
Debugging: monitoring, breakpoints, trace tools
Top 3 responsibilities:
- Develop/test/maintain CODESYS PLC applications using IEC 61131-3
- Design scalable modular architectures (FBs/libraries/OOP concepts) and configure task scheduling/real-time execution
- Implement I/O mapping/device config and integrate systems via industrial protocols/APIs; support commissioning/troubleshooting
Must-have skills:
- Deep CODESYS V3.x development (custom libraries/FBs, state machines)
- IEC 61131-3 programming; real-time control concepts
- Experience with Modbus, CANopen, OPC UA, MQTT (at least some/all mentioned)
- Linux + networking/integration basics (REST, TCP/IP, serial/sockets)
- Strong debugging and code organization; version control/library management
Nice-to-haves:
- Industrial cybersecurity knowledge
- Docker
- Real-time control + PID tuning
- Marine/yacht automation experience
Location & work type: Not specified in the provided t

Full Description

We are looking for a highly technical PLC Programmer / Automation Engineer with strong expertise in CODESYS-based development environments. The candidate must be experienced in IEC 61131-3 programming, real-time control systems, and industrial communication protocols, with the ability to design scalable and modular automation architectures. Key Responsibilities

Develop, test, and maintain PLC applications using CODESYS V3.x platform
Design software architecture using FB, FBD, ST, LD, and SFC
Create reusable and modular CODESYS libraries and custom function blocks
Implement OOP concepts (interfaces, inheritance, encapsulation)
Configure task scheduling and real-time execution
Perform I/O mapping and device configuration
Debug using monitoring, breakpoints, and trace tools
Manage version control and libraries
Integrate systems via APIs and industrial protocols
Support commissioning and troubleshooting
Required Skills & Technical Expertise

CODESYS (Mandatory)

CODESYS V3.x
Function Blocks, Functions, Programs
Library creation and management
GVL and persistent variables
Pointers and memory handling
State machine design
CODESYS Visualization
SoftPLC environments

Industrial Communication Protocols

Modbus RTU
Modbus TCP/IP
CAN Bus / CANopen
OPC UA
MQTT

Systems & Integration

Linux-based systems
REST APIs (HTTP/HTTPS, JSON/XML)
TCP/IP, sockets, serial communication
IoT and edge devices

Preferred Qualifications

Industrial cybersecurity knowledge
Docker (bonus)
Real-time control and PID tuning
Marine or yacht automation experience
Soft Skills
Strong debugging skills
Clean and modular coding practices
Good documentation
Team collaboration

please share your CV

walid.alsalti@sunreef.com

What We Offer

· Competitive salary and benefits package
· Opportunity to work on innovative and sustainable projects
· Supportive and growth-oriented work environment
· Exposure to international standards and advanced technologies