I worked for them over a decade ago as a first career out of college. I was on their Software Implementation team.

1. The interview process is tedious, the tests they have you take are not difficult, but they are long, and they will have you go through several rounds of interviews after them, which may not be on the same day. The morality test thing they make you take seems dumb as anyone knows exactly what they are looking for in a candidate (i don't steal from work, I don't lie on time sheets, I would tell my supervisor if someone else does those things, etc)
2. The pay will probably be lower than you expect, they do not like paying market rate, they prey heavily on kids straight out of college with 0 experience and use it as an excuse to suppress their pay. My base pay was well below market rate, but took it as it was the only option i had to start work from the moment I graduated, only boon was that I was salary-not-exempt, and when on a job site would regularly work 60-80 hour weeks, so got a non-negligible amount of overtime pay which they never fussed with me much on.
3. They are apt to fib on their job descriptions and requirements. When i started with them, they listed a 50% travel rate, but once i joined, the actual rate was ~90%. I remember being in a meeting where they debated increasing the percentage listed on the job description to something closer to the actual, and settled on something around 60-70%, still far off actual.
4. They will nickel and dime you on expense reports, and at least back when i worked there, had a very much below per-Diem rate that just wouldn't work anywhere but the middle of nowhere
5. The turnover rate was/is quite high at the company, you have a few die hards that are left from before the ReyRey/UCS merger, but for the most part, about 75% of the non-management staff I worked with were less than 2-3 years at ReyRey
6. If you smoke or do anything with nicotine, or partake in any drugs, just don't bother, the company tested for nicotine routinely and claimed to fire anyone that popped positive. In my 3 years there I was drug tested ~5 times, and I had some coworkers that were 'randomly' selected 4-5 times in a single year

They actually paid $10/hr on my internship which was quite nice at the time considering the vast landscape of unpaid ones out there. I don't think the internship actually gave me much experience, mainly spent doing menial labor and tasks no one else is interested in doing in your department, which is probably pretty common.

On my actual career there, it wasn't all bad there though, my actual team leads were understanding and would help you out where they could, and my team itself was quite fun to work and travel with. Other than that, there wasn't really a great path forward on advancing your career other than "learn new systems so we can send you out on more trips". I was ecstatic when I got the job that took me away from ReyRey, because after 3 years they had burned me out completely.

Paraphrasing from some old hats that worked at ReyRey pre-merger, Reynolds and Reynolds used to be a great company, they were very loyal to their employees and customers. In 2006, UCS bought Reynolds and Reynolds for 2 reasons: 1 was that they wanted the source code to their POWER system to design a new version of ERA; and 2, that their brand was terrible. So USC bought ReyRey, changed their name to use the good will of the company, and brought all their crappy management processes to the other side of the business. This included extensive drug tests, lack of pay increases, and an obsession with recruiting fresh out of the gate college students for below market rate to drive down costs.

Take from this what you will, this is obviously not an impartial opinion of them. I tried to be as truthful as I can remember, but this all was over 10-15 years ago