Senior Java Developer – Ignition SDK & Control Systems (Oil & Gas Domain)

• Analyze, reverse-engineer, and document an internally developed Sequential Control System toolkit based on Ignition SDK and Java.
• Sustain, enhance, and develop the toolkit codebase with minimal documentation and limited KT support from client.
• Identify code architecture, functionality, and integration with database and UI components.
• Work closely with client engineers to validate analysis findings and propose sustainable solutions.
• Provide long-term development, testing, and database management support for the ARTIE toolkit.
• Collaborate with controls engineers and other developers supporting Honeywell SCM and other toolkits.

• 8+ years of Java development experience with strong understanding of OOP, threading, memory management, and exception handling.
• 3+ years of experience with Ignition SDK or Inductive Automation’s Ignition platform (Designer, Gateway, Tags, Perspective/Vision modules).
• Strong Python scripting experience, especially in integrating with Ignition tags, SFCs, and display elements.
• Experience in reverse engineering legacy applications and documenting architecture and design artifacts.
• Hands-on experience with SQL databases – writing queries, optimizing data access, and schema understanding.
• Familiarity with Git or other version control systems.

• Ignition Vision HMI development and tag structures (UDTs, SFCs).
• Understanding of Ignition Designer layer and interaction with UI elements.
• Experience with integration of Ignition applications with control systems (DCS/SCADA/PLC).

• Prior experience with Honeywell SCM, UCM, RCM, or similar sequential control systems.
• Experience with Honeywell Experion systems, CAB (Custom Algorithm Blocks), control logic, and HMI development.
• Understanding of Purdue Enterprise Reference Architecture and system interactions between L2 and L4.
• Exposure to industrial process automation (chemical plants, distillation units, reactors).
• Familiarity with technical document management and ticket-based sustainment workflows.

• Highly resourceful and self-motivated with minimal supervision.
• Ownership mindset to proactively drive sustainment and development items.
• Strong written communication skills for documenting technical architecture and sustaining knowledge base.
• Responsive to sustainment ticket resolution with a customer-first approach.

Quest Global