In brief, No, currently there is no professional certification available for QGIS users.
However, there are several options to consider at this time, the most promising development as of March, 2019 is information I've come across via this blog post from NRGS - "NRGS and QGIS Certification" where the author highlights
all the talk centered around QGIS certification boiled down to two camps: You had your GISP Approach where your portfolio speaks for it’s self. You have a test (IT Certifications) that certify you on an exam. QGIS isn’t an org that can really do either – so they went with option 3 – the community decides who can and can’t be certified. I submitted my class for review and it passed.
ongoing development of a QGIS certification within QGIS organization using Projecta platform to provide this option - Certification programme overview
The certification platform in Projecta is designed to provide an easy path for projects to be able to issue certification certificates. The system allows a project to approve one or more certification providers. These providers can then set up training centers and course conveners. Course conveners prepare a course and then attendees are assigned to that course. Once the course is completed, certificates get issued by the course convener in digital form. There is the opportunity to charge a fee for each certificate issued. This mechanism can be used to support the parent project.
As a comparison, Esri does provide a technical certification for ArcGIS products.
The link (link is showing up as 404 as of 03/04/2019) you referenced above is the best source I've come across as well that provides a full layout of a "QGIS certificate" details and a certificate template.
How will / does it work?
The program provides a tiered system of certification, with each level only being accessible to those who have completed the underlying levels. A typical workflow will be:
Person attends a training course conducted by a certified trainer or by self study
Person attends a certification center where they complete an online test comprised of e.g. 50 multiple choice questions selected randomly from a pool of e.g. 500 questions. The test requires the user to perform an action in QGIS (running locally using standardised datasets) and then choose the correct answer based on the result they get in QGIS.
On successful completion of the test, a certificate is generated (pdf) presigned by Gary Sherman (PSC Chair) and then printed out and signed by the local examiner office. Each certificate issued is allocated a globally unique number.
On completion of one level of certification the user is eligible to sit exams for the subsequent level.
However, it doesn't appear that it has been finalized at the moment.
Yes, there is continued effort in working towards having a QGIS certificate as there have been meetings periodically discussing how to progress, like (link is showing up as 404 as of 03/04/2019) here and here.
The closest QGIS 'certificate' I found was a 5-sequence course offered by a College in the US - Del Mar College. That offer a certificate in 'Open Source Geospatial Technology'. It was also covered by a GIS content Magazine here
The five courses include:
GST 101—Introduction to Geospatial Technology Using QGIS
GST 102—Spatial Analysis Using QGIS
GST 103—Data Management and Acquisition Using QGIS
GST 104—Cartography Using QGIS and Inkscape
GST 105—Remote Sensing Using QGIS and GRASS The courses are designed to be self-contained complete with all the theory, software instruction, and sample data required to learn at home or office, at your own pace.
They have started with a cohort in 2016 and plan to open enrollment in the Spring of 2017.
Enrollment will be limited to a maximum of 25. If you are interested in joining the first cohort, please contact us. We will be evaluating applicants and selecting the first cohort during October 2016. The first course will begin in fourth quarter of 2016. The next cohort offering will begin in the first quarter of 2017. Email us for more information: firstname.lastname@example.org
Also, in elsewhere I found these programs available:
In British Columbia, Canada there is a program offered by Langara providing a certificate
the curriculum of this program is based on sound principles common to the entire field of GIS, and the classes will be conducted using QGIS
In India, there is a Certificate course in Public Health using QGIS here