Gartner Expert

Gary Olliffe

Distinguished VP Analyst

Gary Olliffe is a Distinguished VP Analyst with the Application Platform Strategies (APS) team in Gartner for Technical Professionals (GTP). Mr. Olliffe covers a range of technical topics, including application architecture, service-oriented architecture, microservices, event-driven architecture, APIs design, API management and application integration.

Previous experience

Mr. Olliffe previously led the enterprise architecture team at Mercer (a global leader in talent, benefits and investment consulting services, with 22,000 employees in more than 40 countries), responsible for application platform and solution architecture, standards and strategy across the enterprise portfolio. During his tenure, he reported to the global CIO and worked closely with global line-of-business CIOs. He was also responsible for M&A IT due diligence review and integration planning.

Professional background


Head of Enterprise Architecture


Senior Architect

Parallax Solutions

Software Architect

Areas of coverage

Software Development for Technical Professionals

Cloud Computing for Technical Professionals

Application Architecture and Integration for Technical Professionals


B.S., with honors, Computing Science, Durham University

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Top Issues That I Help Clients Address

1How to design and implement microservices, event-driven architecture and APIs (including REST and GraphQL), microservices and event-driven architecture

2How to manage and govern services and REST, GraphQL and Event Driven APIs for business and application integration

3Selecting and architecting application and integration platforms and infrastructure including aPaaS, API management, iPaaS and event brokers

4Integrating cloud-based applications with other cloud services and on-premises applications

5Implementing Platform Ops to support DevOps practices and product team agility.