Decmil is a Macmahon Company and the Executive Management Team provides a strong foundation for future strategic and governance initiatives to ensure we remain fully aligned.
See Macmahon Board and Management >
Decmil Management
Deon Baddock
Managing Director - Civil Infrastructure West
Deon joined the business in 2022 through the acquisition of Decmil and was appointed Managing Director of West Coast Civil Operating Companies, in September 2025. He is a Chartered Professional Civil Engineer with 30 years of experience across the resources, infrastructure and renewables sectors in Australia.
Deon brings a strong blend of technical, commercial, and leadership expertise, with extensive experience delivering complex civil and construction projects.
Prior to joining Macmahon, he held senior roles at NRW Holdings where he oversaw major project governance, commercial performance and contractual strategy.
As Managing Director of West Coast Civil Operating Companies, Deon leads the business with a strong focus on strategy, operational delivery, commercial oversight, risk management and contract governance. He is responsible for driving sustainable business performance, ensuring safe and efficient project execution, strengthening client relationships and guiding the Operating Company’s long-term growth. Deon combines technical depth with strong commercial acumen to support the successful development and delivery of all projects from concept to completion.
Deon is a Chartered Professional Civil and Structural Engineer and holds various Postgraduate qualifications.
Simon Barnes
Managing Director - Civil Infrastructure East
Simon joined the business in 2022 through the acquisition of Decmil and was appointed Managing Director, Civil Infrastructure East, in September 2025. He is a Civil Engineer with 30 years of experience in civil infrastructure and construction across Australia.
Simon brings extensive experience delivering major infrastructure projects across diverse contract models, including alliance, design and construct, and public-private partnerships. He provides strategic leadership across governance, innovation and multidisciplinary project environments, ensuring the successful delivery of complex civil works.
Before joining Macmahon, Simon held senior executive roles with Acciona and Lendlease Engineering where he led large project teams and oversaw major transport and infrastructure programs.
As Managing Director of Civil Infrastructure East, Simon is responsible for strategy, operational performance, risk management, commercial oversight and client engagement across the region. He plays a key role in driving business growth, strengthening project governance and supporting high-quality execution from project concept through to completion.
