Is there such a thing as a Ubuntu Certified Engineer?

It is actually called Ubuntu Certified Professional .

The initial Ubuntu Certification was Announced in 2006 jointly with Linux Professional Institute (LPI) for Ubuntu certification exam ,but later as Officially announced here in 2010

"We are really excited to support the Ubuntu 10.04 LTS release with a fresh course and certification programme," said Billy Cina, Director of Training at Canonical. "Having delivered hundreds of courses over the last four years, we listened to the requests from training partners and students for more Ubuntu-specific content. We have responded and are confident that the change will benefit students globally. This will also enable us to move from a multiple-choice- to a 'Live labs'-type exam which is entirely web-based, testing students' ability and Ubuntu skills far more effectively."...

...The Ubuntu Certified Professional course is designed for system administrators required to deploy Ubuntu into an office environment, a trend that is expected to accelerate with the release of Ubuntu 10.04 LTS. Students are not required to have any previous Linux experience but IT/system administration experience is a must. The course lasts for five days in a classroom or self-paced via e-learning. The exams will last 60-90 minutes and be delivered at Ubuntu Training Partner facilities or anywhere with a secure broadband connection ...

But the links are dead on this page

and also noted by h-online here says

Canonical has announced that it will offer its own certification programme for Ubuntu 10.04 LTS and that graduates will be entitled to claim an 'Ubuntu Certified Professional' certification....

The joint programme with the LPI had been very successful, but there was great demand for a pure Ubuntu certification. Now that the new Long Term Support version is nearing completion and release, Canonical has decided to start its own certification programme and offers an online pre-training assessment to determine if the programme is suitable for the prospective candidate.

The test can be taken here provided you have an Launchpad account

Pre-training assessment: Ubuntu Professional

According to this ,a bug was filed for missing Certification page , but the Training Exam page missing bug page doesn't exist any more .

The syllabus or contents covered in the course can be briefly seen here

Current Scenario - No formal announcement regarding the present Course Activity Standing has been made yet , so contacting the respective

Training Team at #ubuntu-training on irc.freenode.net at the Training wiki Home page or through

Ubuntu-training-community mailing list for Official answer would be a feasible and appropriate Idea.

EDIT: Further at Ubuntu Advantage Knowledge they mention about training

Skills training

Ubuntu Advantage offers training for systems administrators and end users training so you can get the most out of your Ubuntu desktops and servers. It also provides online training courses so you can boost in-house skills quickly and easily.

All training courses included with Ubuntu Advantage are structured in modules, allowing you to take different modules when it suits you, and revisit the course to complete any remaining modules when you have more time.

And at Ubuntu Advantage

Knowledge: access to exclusive technical articles from Canonical's Knowledge Base and formal training

while browsing through Server Support they mention Training at the Bottom as

Training link takes you to support page .

Bottom-line they seem to offer Training courses currently through Ubuntu Advantage only as Paid Enterprise service.

P.S. : I may be wrong about the new info , if so then please feel free to edit it.

I just took the
Pre-training assessment: Ubuntu Professional and got the following reply mail from them:

Dear Saji Nediyanchath,

Thank you very much for taking part in the pre-training assessment.

Your score is 9,

Visit: www.ubuntu.com/training for more information.

Best regards and good luck The Ubuntu Training Team

And when we visit:
www.ubuntu.com/training
it redirects to: http://www.ubuntu.com/support
And that page has no information related to any certification courses.
So I'm sure that no such certification exists now.

Update:

Now Ubuntu offers training for sysadmins and devops engineers to become Ubuntu OpenStack experts.

Ref: https://www.ubuntu.com/cloud/training

At this point, no. Not possible.

There is a wiki here. The issue is that at the very end of the first part of non-header text it states 'The below information is obsolete.'.

If you click the link for up to date information, it directs you to the Ubuntu Support page, which seems to me to be about paid support, not training.