How to describe a lot of experience in a formal way? [closed]

I am writing a formal introduction article, I want to describe somebody who has a lot experience on software engineering.

Is there any formal words to replace "a lot"? For example, I have ____ experience on xxx.

Thanks in advance.

Solution 1:

The transparent metaphorical usage of wealth is often used to express this, though it sounds better not used in a first-person setting:

Jane has a wealth of experience in handling delicate relational situations.

The loose quantifier 'a wealth of' is given by, for example, Cambridge Dictionary:

wealth noun (LARGE AMOUNT)

​ C2 [ S ] a large amount of something good:

Jim has a wealth of teaching experience.

It is certainly not out of place in a formal setting.

Solution 2:

If it's applicable, then a time reference works well:

(name) has more than a decade of experience...

source

Also: (more than) fifteen years of, a lifetime of... etc

Another option:

... we have a depth of experience in helping clients...

source

And another one:

Top-level managers (such as CEOs) tend to be big-picture strategic thinkers with a substantial amount of experience in the industry and/or function they manage.

source

Solution 3:

Abundant, considerable or extensive would fit. Depending on the nuance you are looking for you might want wide-ranging or indepth.

But there are a lot of possiblities This thesaurus suggests 169 synonyms including ample experience, long-standing experience, significant expertise. The list goes on!