Welcome: Engineering Dispatches on MES Architecture, GxP Compliance, and Industrial Automation

Welcome to My Engineering Dispatches

I am Vikas Phatak, a Senior MES and Industrial Automation Engineer specializing in regulated pharmaceutical manufacturing. Over the past fifteen years, I have worked at the intersection of operational technology (OT) and enterprise IT, building systems that turn complex physical processes into software you can trust.

In high-stakes pharmaceutical environments, software cannot just function correctly on a happy path. It must be resilient against failure, compliant by design, and verifiable under rigorous regulatory inspection. This blog serves as a repository of technical deep-dives, architectural patterns, and field notes from that intersection.

What I Build: Regulated Manufacturing at Scale

My engineering practice centers around four core pillars:

1. Electronic Batch Records (eBR) & MES Architecture

Transitioning pharmaceutical production from paper-heavy processes to digital execution requires deep domain knowledge. I design and configure enterprise Electronic Batch Records that implement review-by-exception workflows, automated equipment parameter verification, and 21 CFR Part 11 compliant electronic signatures. The objective is always eliminating transcription errors while accelerating batch release times.

2. GxP Compliance & Computer Software Assurance

Compliance is not an afterthought to be bolted on before an audit. I build systems structured around GAMP 5 principles, EU GMP Annex 11, and FDA regulations from the earliest substrate design. By utilizing modern risk-based Computer Software Assurance (CSA) methodologies, we focus testing efforts where risk is highest while maintaining end-to-end traceability from User Requirement Specifications (URS) to validation protocols.

3. Shop Floor IT/OT Integration

Modern manufacturing execution relies on continuous, clean data flow across traditional automation boundaries. I bridge Level 2 shop-floor control systems (PLCs, SCADA, and DCS) with Level 3 MES and Level 4 enterprise ERP systems like SAP. Leveraging industrial protocols such as OPC-UA and MQTT alongside modern RESTful microservices ensures reliable real-time historian tracking and synchronized material management.

4. ISA-88/95 Equipment Modeling

Standardization is the foundation of scalable industrial software. I structure plant hierarchies, process cells, and equipment units strictly aligned with ISA-88 batch control and ISA-95 enterprise-control integration standards. This structured modeling enables digital twins and modular software blocks that can be deployed across global manufacturing networks.

What to Expect Next

In upcoming dispatches, I will be sharing concrete implementations and technical tutorials covering:

• Designing review-by-exception MES workflows that survive regulatory audits.
• Best practices for OPC-UA and MQTT data pipelines in GxP environments.
• Practical applications of automated validation documentation and test protocols.
• Structuring ISA-88 state models in modern software architectures.

Thank you for visiting. You can explore my open-source projects on GitHub or connect with me on X (@ProcessArchX).