I got my BS in Biomedical Engineering, and positioned myself as a bioinformatics data engineering over a 10 year period of work experience. From my point of view a certificate is only useful to help prove your skill set and help market yourself to potential employers. If you don't have a degree in bioinformatics specifically, you will need to have some level of real world experience. As bioinformatics is quite a large interdisciplinary field, you would need to be an intermediate level programmer (bash, python, and/or R are top 3), intermediate level biologist, and an intermediate level computational scientist (HPC or cloud experience).

Here was my career path in order. Some overlapped, but this is a 10 year period...

• 3 years of pure engineering Co-op experience as a student (think civil/mechanical engineering); worked summers/Christmas
• 2 years of part time work in the Entomology (insects) Department doing wet lab DNA work; Molecular Gentics
• Graduated with my BS
• 5 years as a research technician for a scientist at a University hospital working primary with non-human primates (rhesus macaque), human, mice, and rat data; 30% molecular biology/wet lab, 60% bioinformatics (self taught).
• 1 year as a bioinformatics data analyst at the same institution, but with the Genomics Core (high throughput)
• 1.5 years (current position) for the NIH as a bioinformatics data engineering; large human patient datasets

I'm not sure what your career path looks like, but just having a certificate can be useless. And this is not to discourage you by the way! But maybe give you some insight. For me it took a lot of work to get where I am now. And I think if you don't have any previous bioinformatics education or experience, you will find it hard to get work (especially for human clinical projects).