To me at least it reads as a bit unfocused. You've clearly got a mass of experience but for any individual job much, if not most, of it isn't relevant. It's a CV that says "look at all the experience I've got" but doesn't really do a great job of saying why you'd be good for any specific role.
I'd look at three or four resumes, each more focused around a specific skill, industry or problem type. Maybe one as a hardcore Linux developer, one with a more web / multimedia focus and so on. Pick out three or four projects relevant to each one and write a few lines about them. While the fact you've got 35 years of C is impressive and maintain your own Linux distro, it's not going to be relevant for roles focusing on a higher level language and is just distracting from your abilities which are relevant.
Also, personally I'd put it on two pages and space it out far more. Larger font, larger borders, more white space generally.
TL;DR: You're probably better than 90% of devs out there but you're not selling it well. Overall aim for less content but with more punch and make it nicer to read.
Adding to Tyrannosaurs' sibling comment, describing those Open Source projects front and centre might make sense, given that Open Source is currently trendy.
I intended no disrespect. The person who was considering hiring me was the one who used the term. It was a casual discussion. And I will consider caregiver. I do well with older people.
There were two such positions. Both involved relatives of friends. In one case, the family doesn't feel that it's needed yet. In the other, my friend's business has grown more slowly than he'd hoped, so he lacks funds for new expenditures.
Developers who go on long enough are expected to obtain high-level titles by their 50s or to retire at about that time.
I'd like to discuss an issue that you might not have thought about: What's going to happen if you lose your job?
Employment in the 50s can be problematic. If somebody is skilled and employed, and has a high-level title or is a specialist or has useful connections, they should be able to obtain a new position.
Otherwise, they might go from well-off to homeless. It happens. I'm 55, my resume has been called pretty good, and I was worth $1M a decade ago. I'm a transient now. I've got some medical issues, no medical care, and no dentists. Potential jobs are primarily unskilled physical labor, which I'm not able to do.
I'll be taking a shot at tutoring. However, I don't expect that to provide more than gas money. The head of an admin assistant firm said that I can't be a secretary unless I already am one. Two people considered sending me to care for elderly relatives, but we didn't proceed. My title at one of those positions was going to be "poop scooper".
Don't let this happen to you.
For what it's worth, here's my advice:
1. Don't fall off of the employment ladder.
2. Become a specialist. Try to remain broad enough, though, that you don't become obsolete.
3. Build a network of people. Make it a large one.
4. Diversify your investments.
5. While you're employed, don't let medical issues, even minor ones, go untreated for long. If you lose your job and your assets, you'll lose medical care too and the issues may become serious.
6. Be kind to people. But don't be a fool. Most people that you help are not going to return the favor.
Regarding specialists, I did recruiting for a while in 2011 and I can confirm that the filters are heavily weighted against generalists.
I've spent about 35 years myself as a generalist. My jobs called for it. The place where I spent most of my career took any project that came along, code of any type. At a dot-com that followed, after the money ran out, I handled all of the technical roles; IT, websites, development, support, documentation, etc. I was able to do a bit of everything.
Later on, none of this made a difference. There are no job listings that say "a bit of everything".
After the dot-com shut down, 2003, I made a million dollars in the stock market. Lost most of it afterwards and reentered the job market. Learned that middle-age generalists were not in high demand.
In my case, there were other factors that won't apply to you. It's a story for another time. But if you're a generalist who falls off of the ladder in middle age, you can expect things like this:
"With a resume like that, why isn't he a CTO? Why doesn't he even have a job?"
You'll be asked questions about algorithms that you haven't thought about for 30 years. Or you'll go through coding tests under adverse conditions that don't allow you to show what you can do.
Plan ahead. Understand that the best-laid schemes of mice and men often go awry.
Jesse is starting out but is more determined than most. He has worked on a commercial game and is interested in internships or similar arrangements. He has demonstrated the ability to pick up new languages and frameworks. Might be an asset for startups with limited funds.
I can't address the email issue directly. But I know the person behind the product. She's always struck me as sincere. If there was an issue with email I believe she'd be responsive.
You get an email with the sizes the calculator calculated for future reference when they are needed and once the product launches you will be notified. We probably worded it bad, we're not native speakers :) But we're not going to spam folks.