M365 Developer

INEOS Belgium; Runcorn; On-site; GBP 70,000 - 90,000; Full time

Job summary

INEOS Inovyn is seeking a Senior M365 Developer to lead the design, development, and evolution of Microsoft 365 based solutions that drive digitalisation and data-driven decision making across the organisation.

You will own end-to-end delivery, collaborate with stakeholders, and shape the M365 and Power Platform strategy while mentoring junior developers in a distributed team environment. This full-time role is based in Runcorn, United Kingdom.

Qualifications

• Strong experience designing and developing solutions within Microsoft 365, including SharePoint, Power Apps, Power Automate, and Power BI.
• Proven ability to translate business requirements into scalable technical solutions and architectures.
• Experience integrating systems using APIs, including Microsoft Graph API and external services.
• Experience with development and integration tools such as Visual Studio, Visual Studio Code, Microsoft Graph Explorer, and Postman.

Responsibilities

• Partner with business stakeholders to understand processes, challenges, and opportunities, shaping effective M365-based solutions.
• Lead the design and development of scalable solutions across the M365 stack, including SharePoint, Power Apps, Power Automate, and Power BI.
• Own end-to-end solution delivery, including architecture, design, build, testing, deployment, and user adoption.
• Drive best practices in solution design, governance, security, and lifecycle management across the M365 platform.
• Act as a technical lead for M365 initiatives, including oversight of SIT, UAT, and go-live activities to ensure high-quality delivery.
• Maintain and optimise existing solutions, ensuring performance, reliability, and alignment with evolving business needs.
• Contribute to the definition and evolution of the M365 / Power Platform strategy, identifying opportunities to improve efficiency and standardisation.
• Support the adoption of modern development practices (e.g. CI/CD, DevOps, reusable components) within the platform.
• Provide guidance and mentoring to junior developers and support collaboration across a distributedteam.

Skills

Microsoft 365

SharePoint

Power Apps

Power Automate

Power BI

API integration

Azure

Governance & security

Agile delivery

Stakeholder engagement

Tools

Visual Studio

Visual Studio Code

Microsoft Graph Explorer

Postman

Job description

INEOS Inovyn is Europe's leading producer of vinyls and in the top three worldwide. With an annual turnover of €5.1 billion, INEOS Inovyn has circa 4,300 employees and manufacturing, sales and marketing operations in 8 countries across Europe.

INEOS Inovyn’s portfolio consists of an extensive range of class-leading products arranged across General Purpose Vinyls; Specialty Vinyls; Organic Chlorine Derivatives; Chlor Alkali; Hydrogen and Performance Chemicals. INEOS Inovyn's annual commercial production volume is circa 10 million tonnes.

The Senior M365 Developer is responsible for leading the design, development, and evolution of Microsoft 365 based solutions that enable digitalisation, automation, and data-driven decision making across the organisation. This role combines hands-on technical delivery with platform ownership, working closely with stakeholders to translate business needs into scalable, secure, and maintainable solutions aligned with the overall M365 and Power Platform strategy.

Key Responsibilities

• Partner with business stakeholders to understand processes, challenges, and opportunities, shaping effective M365-based solutions.
• Lead the design and development of scalable solutions across the M365 stack, including SharePoint, Power Apps, Power Automate, and Power BI.
• Own end-to-end solution delivery, including architecture, design, build, testing, deployment, and user adoption.
• Drive best practices in solution design, governance, security, and lifecycle management across the M365 platform.
• Act as a technical lead for M365 initiatives, including oversight of SIT, UAT, and go-live activities to ensure high-quality delivery.
• Maintain and optimise existing solutions, ensuring performance, reliability, and alignment with evolving business needs.
• Contribute to the definition and evolution of the M365 / Power Platform strategy, identifying opportunities to improve efficiency and standardisation.
• Support the adoption of modern development practices (e.g. CI/CD, DevOps, reusable components) within the platform.
• Provide guidance and mentoring to junior developers and support collaboration across a distributedteam.

Skills and Experience

• Strong experience designing and developing solutions within Microsoft 365, including SharePoint, Power Apps, Power Automate, and Power BI.
• Proven ability to translate business requirements into scalable technical solutions and architectures.
• Experience integrating systems using APIs, including Microsoft Graph API and external services.
• Experience with development and integration tools such as Visual Studio, Visual Studio Code, Microsoft Graph Explorer, and Postman.
• Good working knowledge of Azure services, including Entra ID, App Services, and Function Apps.
• Understanding of governance, security, and compliance considerations within the M365 ecosystem.
• Experience working within distributed teams using modern delivery methodologies (e.g. Agile).
• Strong stakeholder engagement and communication skills, with theability to operate across technical and business audiences.
• Demonstrates high levels of professionalism, ownership, and accountability.

We are INEOS | INEOS Group
INEOS is one of the world’s largest chemical producers and a significant player in the oil and gas market. Learn more about who we are, today.

Job Details

• Location Runcorn, United Kingdom
• Discipline Other
• Type Full-time
• Posted 06 July 2026
• Closing Date 31 August 2026
• Requisition ID 3949