Senior developers (really seniors, not 3 year seniors) can trivially produce such amount of code, because they wrote almost same code dozen times already.
Maybe not the best example, but I used to work with a guy who had pretty large scripts that he was writing for one of our projects. It turns out it was mostly copy-paste, so it sort of got the job done -- except he fixed bugs in one place but not in the other. The whole thing was a huge mess to understand and maintain. And he was a senior engineer at the time (now principal, to my great amazement).
Why are they writing the same code again instead of writing different code? Why aren't they learning about new APIs for topics they aren't so experienced in? What makes them "senior developers" and not "senior transcriptionists"?
Who is tasked with digging into 10 year old code, written by an ex-employee, to find a subtle bug? Who is identifying and fixing performance issues?
How are these "senior developers" able to write 1KLoC/day plus documentation and developer tests? I find test code and documentation each take as much time as writing the code in the first place.
Why aren't some of these senior developers producing negative LoC? https://www.folklore.org/StoryView.py?story=Negative_2000_Li...
For example, 1M+ LoC of code, including build system, CI, test cases, built-in documentation, in 6 months is about 7kLoC per day, divided by 5 developers it's about 1400LoC per day per developer.
I completed 30+ projects already, I have 20+ years of experience. Few years ago I was able to close up to 20 tickets per two week sprint, when I worked with same level senior developers and dedicated PM, product owner, and QA team, at large outsource company at fixed-price projects.
It's easy when tickets are properly sized and described by PM, when PO is responsive and easy to reach, and when QA covers your back for complex test cases. 6 month project + 1-2 months to recover after, and then another such project.
Those numbers are ridiculous, and I say this having 25+ years of professional experience.
The typical industry numbers are under 100 LoC/day.
Eg, slide 20 of https://www.slideshare.net/ddskier/calculating-the-cost-of-m... ("A world-class developer (e.g. Facebook or Google senior engineer) will write 50 LOC per day")
"Improving Speed and Productivity of Software Development: A Global Survey of Software Developers" at https://uweb.engr.arizona.edu/~ece473/readings/9-Improving%2... (Fig 6) has Lines-of-Code per Total Man Months at about 1,750, so about 81 lines per day (assuming 21.62 work days per month).
"A Practical Approach to Software Metrics" at https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=819938&... says "Many industry rules of thumb describe programmer productivity in terms of lines of code, for example 350 [noncomment source statements] per engineering-month of effort." That's 16 lines per days.
Going the other way, in the COCOMO estimator at https://strs.grc.nasa.gov/repository/forms/cocomo-calculatio... your 1 MLoC for an "organic" project estimates 3390 person months. Not the 30 months you mentioned.
That said, it's really easy to distort LoC measurement. And I mean beyond the "put in 1,000 lines of the form 'a=1'" cheat.
For example, LoC traditionally refers to source code, not test, CI, etc. that you use. Why did you use that non-standard definition?
Test code, for example, may contain a lot of data records and autogenerated code. This doesn't require the same work as a source line of code.
Consider SQLite. https://sqlite.org/testing.html says the library is 143.4 KSLOC, while the test suite is 91911.0 KSLOC - nearly 100 million lines of test code! These tests were not all written by hand. At that ratio of test code to source code you would have about 1,400 lines of source code.
And it's possible to mis-measure source code. A few years ago I added about 400,000 lines of code to my project in a few weeks. These were auto-generated when I replaced a very confusing set of C preprocessor directives with a homebrew template system to compile specialized versions of functions across my parameter space.
I then added some Cython projects, which generates C files about 50x larger than the original pyx files.
Counting auto-generated code makes LoC a worthless measure.
You also wrote you have a QA team. I assume their test cases are in your repo, and counted in your 1M+ LoC count, but you didn't include their time.
The post-release defect rate per KLoC is about 7.47 (average) and 4.3 (median). See An Overview of Software Defect Density: A Scoping Study at https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6462687... .
If you write 1KLoC/day then you're likely generating 2 post-release defect bugs per day. That's in addition to bugs your QA team catches.
Your "up to 20 tickets per two week sprint" simply isn't enough to catch up with the number of bugs you likely generate.
Your numbers are so far outside of industry standards and academic findings that, with 20+ years of experience, you must know they are exceptional and difficult for anyone else to accept on your simple say-so.
> Are your fixed-price estimates based on LoC?!
I don't now. I was not a part of sales.
> Else, why aren't you embedding that knowledge in a corporate library ("contractors tools") which you license to all your future customers?
Because each customer has different requirements, different goals, different language and framework. Nobody wanted to pay for a library.
> If you write 1KLoC/day then you're likely generating 2 post-release defect bugs per day. That's in addition to bugs your QA team catches.
In practice, I had about 1 serious bug slipped per 1-2 weeks. Professional QA team known a lot of corner cases to test already. Professional developers know them too, even when writing in a different language using different framework. Moreover, we know how to prepare good CI, efficient automated tests, how to write efficient documentation, who is responsible for what, etc.
> Your numbers are so far outside of industry standards and academic findings that, with 20+ years of experience, you must know they are exceptional and difficult for anyone else to accept on your simple say-so.
How much I will be paid if you will accept my story? :-)
> Because each customer has different requirements, different goals, different language and framework
Sure, but that doesn't match your earlier statement that the senior developers 'wrote almost same code dozen times already'.
That is, I don't see how "almost the same code" is able to handle different requirements, etc.
How much would you pay me to accept your story? ;)