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About Bitfield Consulting

John Arundel, principal consultant of Bitfield Consulting, has been writing software for 35 years, managing Unix systems for nearly three decades, and working on infrastructure from nuclear power stations to Netflix since he was knee-high to a login prompt.

He is the author of several technical books, with sales of over 15,000 copies worldwide, and has worked with hundreds of clients as a consultant, including Dynatrace, CareZone, Wide Open West, AppDynamics (a Cisco company), Mark Boulton Design, Wordtracker, Intentional Software (now part of Microsoft), and many more.

His expertise includes:

  • Kubernetes
  • Docker
  • Puppet
  • Cloud infrastructure with Amazon AWS, Google Cloud Platform, and other providers
  • Monitoring and observability
  • Scalability, reliability, and performance
  • Configuration management
  • Infrastructure as code
  • Building great DevOps teams

When not writing or consulting, he tweets to more than 100,000 followers as @bitfield. You may like to follow him there too.

About John

I’ve called upon John several times across my career to provide his wisdom and guidance on all things systems. He is an excellent consultant, and a diligent proponent of all things DevOps. He has provided mentoring and support to our entire team, and is a fine ally and negotiator.”
—Mike Thomas, Head of Development, ThirtyThree UK

John is a pleasure to work with and helps us find order in the chaos. He offers expert, prompt and reliable service, and is flexible and willing to adjust to changing requirements and priorities. I recommend him without reservation.”
—Bridget Almas, Chief Architect, Alpheios Project

Superb from both a technical and business angle, John makes everyone in the meeting room happy with his work.”
—James Darling, Technical Lead, Government Digital Service

John combines strong technical expertise in both system administration and programming with excellent personal skills.”
—Stephen Nelson-Smith, principal consultant, Atalanta Systems

His skills have saved my life more than once.”
—Dan Webb, VP Engineering, Deliveroo

“John Arundel is both a superb engineer and, just as importantly, an excellent teacher/communicator.”
—Amazon reviewer

Get in touch

If you think you could use John’s help and advice, or just have a question, email

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