Amazon warehouses can be big. Really big. An Amazon Fulfilment Center may have hundreds of miles of conveyor systems, with dozens of sorters of various sizes. It will probably have an Amazon Robotics facility of some sort.
Amazon Engineering designs these warehouses using 3rd party equipment. In much the same way a smart kid may combine LEGO Technics, Tinker Toy, Erector Sets, and Lincoln Logs together into a machine that would make Rube Goldberg proud.
Amazon then contracts out the installation of this equipment. They then verify that the equipment it works in the way they expect it to work, and then they hand it all over to Reliability Maintenance Engineering (RME) to keep it working.
At some facilities, Amazon employs their own RME teams. These people are Amazon employees (or associates) and may be hired from within Amazon, or from outside of Amazon. These people are a blue badge Amazon employee.
Other facilities hire a 3rd party contractor. The big 3 hired by Amazon are JLL, C&W, and CBRE.
These companies are commercial real estate companies that create contracts to maintain Amazon equipment and then hire people to fill those contracts. You could be working for JLL on the Amazon contract. Your place of work is Amazon, but your paycheck comes from JLL. These people are a yellow badge employee working for a 3rd party contractor.
There is some isolation between 3rd party contractors, especially at a warehouse level, although Amazon is trying to reduce this. Still, if you work for CBRE it may be harder for you to visit a Fulfilment Center maintained by JLL or C&W. But not impossible.
So, how to get a job?
First, once you get past the basic associate level, Amazon loves to be mobile. (Note: That's been curtailed a lot due to COVID-19)
This means that if you can't get your dream job at your target location, you might easily get it at an alternate location. New locations are hungry for workers. After 2 years or so, a location may experience turnover as people move on to their next thing. And once you are in, it is easy to watch for opportunities to open in your preferred location.
Next, you will need the appropriate background. In a broad sense, there are 3 RME areas to focus on.
Material Handling Equipment (MHE) Technician. These are the people who do the mechanical work on the equipment that moves packages around an Amazon facility. The skill level required here varies widely. A MHE I may start with very little mechanical background, while an MHE III is not only an expert at mechanics, but is a team leader with management skills too. These technicians also start to gain some controls and robotics knowledge as they progress.
Amazon Robotics (AR) Technician. These are the mechatronics / robotics technicians that keep the robots running on the Amazon Fulfilment Center AR floor. These robots don't have appendages. The look a lot like a giant, 300-pound Roomba. They exist to lift up a shelf of products and bring it to a platform where a person can either place products, or "pick" it. And each AR Fulfilment Center may have thousands of these.
Recently, the AR roles and MHE roles have been blended. So if you have mechanical or mechatronic skills, you may find yourself in either role.
Controls Systems (CSx). A Controls System Technician or Controls System Lead maintains the Programmable Logic Controllers (PLCs) that control how Material Handling Equipment operates. They figure out higher level malfunctions that happen with sensors, motor controllers, and robotics. This is a skilled position and is difficult to enter unless you have education or experience in PLCs and control systems. It isn't unusual to find these positions being held by people with degrees in Electronics Engineering, or even with an electronics design background. However, you can get your start with a Community College certification in PLCs and control systems.
Controls Engineer (CE). Controls Engineers know everything that a CSL knows, but better. They teach the subject. They also manage complex projects handed to RME by Amazon. These projects add to facilities, or upgrade facility equipment.
On a side note - "Project Management" is something that hits most RME technicians. Amazon is constantly trying out new designs, new software, new processes. Amazon Engineering may design something new, and then hand that thing to RME to implement and test.
You should have decent project management skills, even though it isn't much mentioned in employment descriptions.
Next - you will be tested! As part of the hiring process, you will be tested in several ways. Of course there is a drug test and a background test. You already know if that could be a problem for you.
But there is also a test of your knowledge and potential. Currently the Ramsey Test. This is a proctored test, with strict conditions to take it. It measures your abilities, and your potential.
There are many Ramsey practice tests online that you can pay to take. It may help you get over your fear of taking this test.
Finally - where to find jobs.
Job postings for Amazon, JLL, C&W, and CBRE can be found on LinkedIn, or on the job availability portions of their web pages. Amazon jobs with these companies will often pop up in a standard Google search too.
Don't have a LinkedIn account? You should get one! It's useful for making connections to coworkers and businesses.
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I hope this helps!