His legacy lives on
Rest In peace

micromanager: "Quick and easy win! Please have this done in 2-3 days to start repairing your reputation"

ticket: "Scrap this gem, and implement your own external service wrapper using the new and vastly different Slack API!"

slack: "New API? Give me bearer tokens! Don't use that legacy url crap, wth"

prev dev: "Yeah idk what a bearer token is. Have the same url instead, and try writing it down so you don't forget it?"

Slack admin: "I can't give you access to the slack integration test app, even though it's for exactly this and three others have access already, including your (micro)manager."

Slack: "You can also <a>create a new slack app</a>!" -- link logs me into slack chat instead. After searching and finding a link elsewhere: doesn't let me.

Slack admin: "You want a new test slack app instead? Sure, build it the same as before so it isn't abuseable. No? Okay, plan a presentation for it and bring security along for a meeting on Friday and I'll think about it. I'm in some planning meetings until then."

asdfjkagel.

This job is endless delays, plus getting yelled at over the endless delays.

At least I can start on the code while I wait. Can't test anything for at least a week, though. =/

My previous manager always complained about the programmer that used to be there before me was utterly incompetent and unable to work.

One day checking a legacy app that needed a minor update I was looking at the code and said: “It is true the previous programmer didn’t even know how to put together 2 lines of code, this is literally the shittiest thing I have ever seen, thank God he is not around anymore!”

…

Manager: “Actually I wrote this myself”

…
…

When you have to support over 20 years of legacy code.

In the begining of time, when The Company was small and The Data could fit in some fucking excel sheets, Those Who Came Before implemented some java tool to issue invoices, notify customers and clear received payments.

Then came the Time Of The Great Expanse, when The Company grew to unthinkable levels. Headcount increased with each passing day, and The Data shows that everything was going great!

But when the future seemed bright, came The Stall-Out. The days when The Company could not expand as fast as it did before. And Those Who Came Before left, abandoning their Undocumented Java Tool to its own luck.

Those who came after knew nothing of the inner workings of the Undocumented Java Tool. They knew only that the magical Jar would take a couple fucking excel spreadsheets and spit out reports and send emails like magic.
And those were The Dark Days.

In the darkness, The Data grew to be a monster. Soon a fucking excel spreadsheet could not hold The Data contained any longer. Those Who Came After, fearing the wrath of The Undocumented Java Tool, dared not mess with its code. Instead, they fucking cut away the lowest volume transactions from the fucking input spreadsheet, and left the company to report the unbilled invoices as "surprise losses". Fucking script kiddies, were Those Who Came After.

Then, at The Darkest of Days (literally, Dec 21st), marched into the project The Six Witchers, who fear not the Demon of Refactoring.

This story is still unfolding. Will The Six Witchers manage to unravel the mysteries of The Undocumented Java Tool? Will they be able to reverse engineer the fucking black box, and scale it's magic into a modern application?
Will they decrease revenue forecasting error by at least 2% in a single strike?

Only the future will tell.

[CMS of Doom™]
The gift that keeps on giving...
When you think you've seen it all after 7 months in legacy hell, you get another gift:

Let's say you use PHP, but your IQ is in the zero-ish range, then it is obvious to:
- use define() for constants in all your config.*.php files
- then include said config.*.php files multiple times
- and because define() doesn't overwrite the same constant, because it's - you know - a constant, you instead of including just do a file_get_contents() to read the PHP file as string and then parse the values by Regex.

The dev who wrote this was truly one of the devs ever.

An ancient legend goes that there exists sacred knowledge that enables anyone possessing it not to turn one’s career into a constant uphill battle with the management.

I sought this knowledge, I travelled the world, to no avail. Once upon a time, I climbed the Mount Fuji and met the wizard in his pagoda on the mount. I won in a CSS-golf battle with him, and he revealed the sacred truth: one need to chose companies that do business instead of constant backroom deals and dick-measuring contests.

Like Prometheus, I give this knowledge to you. An ancient scroll says that for this I’ll be chained to the mountain of PHP legacy code, and HRs will peck my brain for eternity, but I found Arachne, the queen of HRs, and exchanged the keto-diet secret for freedom.

My tech lead keeps assigning me incident tickets in the company's worst legacy app because I solved some bug in it a while ago. I'm the only one who gets assigned these.

If this keeps going, I know for sure that I will be regarded as the designated developer for this application. Then I will be truly fucked.

These fucking imbecile devs left me a bunch of bugs in a 150k LOC legacy hell...
Too bad it took some 8 months for them to finally surface in prod. God damned...
Technically, this whole codebase is one giant abyss filled to the brim with bugs.

What you see:
"we gonna build a new application to replace our legacy one"

How to read:
"we gonna make you put more shit in the legacy app whenever we want and still keep asking about the new app you don't have the time to make"

Fuck this completely abysmal CMS!!!!
Not even god damn Einstein would be smart enough to understand this stinky pile of legacy code!
No, it's not enough to write an HTML template in PHP with less than 500 lines of code, noooooo, every god damn template HAS TO BE AT LEAST 3000 FUCKING LINES OF CODE WITH RANDOM INCLUDES EVERYWHERE!!!
Every fucking thing I fix spawns at least 2 new bugs! I FUCKING CAN'T!!!
I swear, if I meet these fucking worms of developers... someone will eat fresh turds mixed with puke from a highway toilet!

There are so many weird hacks in the quite legacy app I work with I could write a book about all them hacks…

But I must admit, the worst of them all is internal time. Yes, so some blockhead thought it’s a good idea to represent time in a manner completely removed from Datetime objects or timestamps or even string representations. Instead we deal with them as intervals represented by integers - and because this is not fucked up enough by itself, the internal time doesn’t start at midnight, yet the integer representations do. It’s a bloody mess. No wonder most of the bugs we face have to do with dates and time…

Problem: ugly-ass php spaghetti code that has a technical debt of 16(!!!) years. I mean, it's so spaghetti that has two legacy frameworks that talk to each other inside the same monolith.

Observation: after two months my colleagues, trying to refactoring stuff, they were able to touch so little stuff that it almost made no difference.

How much is worth a rewrite? Because i don't think i can make a difference on a codebase so messy.
I know that rewrite is not the answer 99.9999% of the time, but i have tons of doubts here.

The most C++ I know is from 5 weeks of 'learning' it in college. Now I've been handed a legacy C++ project from sometime before 2004 and am expected to figure out how it works, update it to either a newer C++ version, and compile it to NOT a 16 bit dll (like the current version is) to replace the one on our servers.

Ummmm... wish me luck

So, first time ranting, sorry if I mess anything up.
When I first started my current job and got introduced to the system we were coding in, something seemed a little fishy to me. Didn't like the system anyway, but at least the language is a compiler language, so it runs quite quickly, right?
In theory, yeah. If the lead dev liked the IDE that came with it. But he has to REALLY fucking hate it, because rather than using it, he codes in plaintext. No syntax highlighting, no auto-indent, nothing. And he's built the entire damn system around doing that. Sadly the compiler is only integrated into the IDE, so what do we do there? Copy the code from the plaintext file to the IDE to compile it there? No no, why would you. The language has a function you can use to compile some code at runtime.
And so he does. Every. Single. Fucking. Script. There's a single main script that runs and finds the correct textfile to then runtime-compile and execute. So we effectively made a compiler language into a massively unoptimized interpreter lang.
I even mentioned that this might be a problem, but I was completely dismissed, so at that point it's not my problem anymore and I have then switched to a different system anyway.
Couple weeks later I heard the same guy complaining that the scripts were running almost the whole night so we'd probably need some better hardware or something.
Well if only there was a really obvious solution that would improve the performance by probably about a factor of 20 or so...

how often did this happen to you?

- fix a bug
- think, now that i'm here, let's smuggle in some refactoring, just this aspect, won't take too long
- spend more than half a day refactoring, finally finding yourself entangled in a spaghetti nightmare
- stash / shelve and revert all your refactoring changes
- continue on your other tasks and talk to noone about it ._.

Sometimes my boss wants me to fire a bullet without a gun, they want me to throw the bullet so hard that it feels like it was shot via a gun.

Maintaining a legacy app sucks so bad when you don't even have the full codebase and some douche bag decided to just randomly throw the codebase on the fucking SVN. 😠

So it turns out that one of our systems is so fucking old that its Log4j is off the hook. What they say of blessings being disguised as curses is real.

I think I’m going to lose my mind. This stupid website I’m working on keeps going down and at the worst times possible. Nothing we do seems to help. I’m again awakened in the middle of the night to attend to it and still have no good answers why. My anxiety is through the roof because I can’t get back to sleep after tonight’s outage. The client is beyond pissed even though a ton of problems would be solved if they would just get off of some legacy software and onto something more modern. But they insisted it be this way and the budget is already blown and then some even if they changed their minds. If it’s going to be that I continue losing so much sleep and sanity, I may just have to quit this job. I hate the thought of that because I always want to see things through to a happy conclusion. And I like my teammates and don’t want to let them down. But I’m too old for that kind of no-sleep development lifestyle now. Nobody’s shitty website is worth my physical and mental health.

"Biggest challenge you overcame as a dev?"
Overcame? I wish! I'm in the midde of fixing the worst legacy code clusterfuck I have ever seen...
Yes, it's even wayyyy worse than WorstPress...

There are days where my coworkers hear profuse laughter coming out of my lone bureau, some of them might already be thinking that I've gone mad. Maybe I have... bwahahahaha

I really hate sales people. My stakeholder wants to buy an address verification service but is hesitant to purchase now because the dev time needed would be substantial. Now the sales rep has planted seeds of doubt in my SH and SH thinks I grossly overestimated the labor I quoted.

Sales rep is all “major corporations have installed this in a weekend.” 🤬🤬🤬 Major corporations also have more than one developer and probably aren’t dealing with a website that has a dozen address forms that all work differently. Oh, and I DON’T WORK WEEKENDS MOFO.

My SH originally requested a labor estimate for installing the AVS on all address forms and that’s what I delivered. My audit revealed a dozen different forms. I’m working with a legacy code base that’s been bandaged together and maintained by an outside dev agency. The only thing the forms have in common is reusable address fields. They all work differently when it comes to validating and submitting data to the server and they all submit to different api endpoints. At least a quarter of those forms are broken and would need to be fixed (these are mostly admin-facing). I also had to provide an estimate on frontend implementation when I have no idea what they want the FE to look like.

My estimate was 5-8 weeks for implementation AND testing. I wrote up my findings and clearly explained the labor required, why it was needed, and the time needed. All was fine until the sales rep tried to get into SH’s head.

My SH is now asking for a new estimate and hoping for 1-2 weeks of labor, which is what will SH to buy the AVS. Then go to the outside dev agency you used to work with and ask for a second opinion. I’m sure they’d also tell you at least month if not more for testing, implementation, and deployment because you have a DOZEN FORMS you want to add this to. 1-2 weeks is only possible for a single form.

My manager doesn’t work in the same coding language I do, but he read my documentation and supports my original estimate.

I honestly want to ask my SH if this sales rep is giving a very good price for the AVS. If not, are there other companies in the mix? Because right now you have a sales rep that’s taking you for a ride and trying to pressure you all so he can get another notch in his belt for getting another “major corporation” as his account. I don’t think it’s a good idea to be locked in with a grimy sales rep.

There are devs who are chill. Then there's me. Deadlines give me anxiety. Being responsible for the code I didn't write and being blamed for the bugs I inherited stress me out.

"I'm a recruiter for this company that does mostly finances. It's a very stable company. It's over a hundred years old."

That sounds nice, but I can't help but wonder the abyss of legacy codebases a company that old can have. Specially since it's not a dev agency.

There is a commercially sold ERP solution that has it's DB schema in excel and Other documentations in MS Word. And its not even properly structured, no schema diagrams, last updated for a 4 year old major release 😒😫.
I have to develop a custom module for it and that requires building an ActivexDLL Project in VB fucking 6 😭😭 .

VB6
Unstructured Documentation
Legacy code
Incomplete documentation
FML

Tell me if you want ss in comments.

[CMS Of Doom™]
Ah, yes, their built-in bullshit newsletter module just sent the n-th user n emails. Wonderful considering n=368.

The culprit? Better don't ask...
OK, anyway: So the mailer is running as a CRONjob, but nah, not as a console script call but by a public HTTP GET URL call, fucking obviously (it's the CMS Of Doom for a reason).
So these fucking imbeciles "implemented" an ob_start() callback where HTML links are - for whatever fucking reason - modified by some regex (obviously everybody knows parsing HTML by Regex is trivial). In this case the link was somehow modified to recall the mailer Cronjob...
This must have upset the pngoing mailing process thus spamming mails. Whyyyy

And I've thought I've seen it all after 6 months in this legacy hell...
This is why you don't run a company consisting of only beginners in PHP (in cluding their "CEO")!

After a rough exit from one company, I was diverted into Ops just to continue to have food on the table and keeping the lights on. This, over time, unfortunately made me more or less unemployable as a dev again. Got stuck in that place 13 years doing almost no professional coding.

During the last 5 years I took courses, got side jobs writing articles and tutorials, went to interviews and generally worked hard to get the fuck out of ops and into development again.

After getting to choose between level 1 customer support and quitting in a re-org, I quit without having a new gig. I got a lucky break through someone I'd worked with earlier to start a junior position working on some legacy systems with legacy tech.

After all that work late nights churning away using up my passion for coding, I now can't make my self pick up even Advent of code or Hacktoberfest... My passion is dead... I hope I get it back, but for now I fill my spare time with my guitar...

A legacy custom made WordPress Theme.

Old developer made main styling sheet with 8000+ lines of code with no component separation.

Talk of PHP legacy codebase...

So I made an update to my React Native app. I changed UI of a couple of screen, added a few animations here and there, refactored how my graphQL resolvers work in the backend(no breaking changes), changed how data gets loaded into the database etc.

It worked in dev so I figured hey let's deploy it. Today is(was because it's now 3am but more on that later) a national holiday so no one goes to work so no one will use my app so I have an entire day to deploy.

I started at 15:00(because i woke up at 13:00 lol). I tested the update once again in dev and proceeded to deploy it to prod. I merged backend to master, built docker images, did migrations on the db, restarted docker-compose with new images. And now for the app. I run ./gradlew assembleRelease and it starts complaining that react-native-gesture-handler is not installed. Ugh, rm -rf node_modules && yarn install. It worked. But now gradlew crashes and logs don't tell me anything. Google tells me to change a bunch of gradle settings but none of them work. Fast forward 5h, it's around 20:00 and I isolated the issue to, again, react-native-gesture-handler. They updated from 2.2.4 to 2.3.0 which didn't fucking compile. 2 more hours passed (now 22:00) and I got v2.3.1 working which fixed the problem in 2.3.0 but made my app crash on startup. YOUR FUCKING LIBRARY GETS 250K WEEKLY DOWNLOADS AND YOU DONT EVEN BOTHER CHECKING IF IT COMPILES IN PROD ON ANDROID?! WHAT THE FUCK software-mansion?

After I solved that, my app didn't crash. Now it threw an error "Type errors: Network Request Failed" every time I fetch my legacy REST API(older parts use rest and newer use graphql. I'll refactor that in the next update). I'll spare you the debugging hell i went through but another 5h passed. Its 3am. My config had misspelled url to prod but good for dev... I hate myself and even more so react-native-gesture-handler.

C, C++, and Java are legacy programming languages.

So, for the ones who fear that the language will go away in mere 10-15 years. Chill. These languages will stay forever.

A sweaty furry sodomizing a dead dog would still be less disgusting than the codebase on which I have to work, some highlights are:
- The same class repeated 40 times with little variations instead of using some decent parametrization
- Inexistent encapsulation and separation of concerns, most changes requires to modify and recompile 2-3 indipendent Maven projects
- Abuse of inheritance which instead of being used to create "is-a" relationship as it should be it's used to reuse some methods of a class in another instead of using Spring dependency injection as we should be

It would be understandable in a 20 years old legacy projects but in something which started 2 months ago it drives me mad, I tried to fight to change it but in the big enterprise to which I'm "body-rented" it's impossible

Best:
- I built a good automation mechanism with a decent UI [slackbot]
- used as few frameworks and ext libs as I could. Mostly based on bare java
- client wanted to migrate it to Spring
- got 3 peeps assigned for the migration
- 2 months later their effort failed.
- win: my project has not been molested with Spring

Worst:
- i had an idea to develop smth on top of jmeter, using jmeter as a lib
- I downloaded and imported jmeter's src code
- static contexts, singletons, jmx/rmi everywhere [java is deprecating rmi support]
- not gonna happen... Not gonna build a new project on top of a legacy codebase.

Feels like every damn day I'm learning about another language feature that we CAN'T use... So much legacy code everywhere.

C# is more like C-blunt at this point.

I currently work on a legacy system for a company. The system is really old - and although I was hired as a programmer, my job is pretty much glorified data entry. To summarise, I get a bunch of requirements, which is literally just lots of data for each month on spreadsheets and I have to configure the system to make it work, which is basically just writing a whole bunch of SQL scripts.

It’s not quite as simple as that, because whoever wrote the system originally really wrote it backwards, and in fact, the analysts who create the spreadsheets actually spend a fair bit of time verifying my work because the process is so tedious that it’s easy to make a mistake.

As you can guess, it is pretty much the most boring job ever. However, it’s a full time job with decent pay, and I work remotely so I can stay home with my son.

So I’ve been doing it for about 18 months and in that time, I’ve basically figured out all the traps to the point where I’ve actually written a program which for the past 6 months has been just doing the whole thing for me. So what used to take the last guy like a month, now takes maybe 10 minutes to clean the spreadsheet and run it through the program.

Now the problem is, do I tell them? If I tell them, they will probably just take the program and get rid of me. This isn’t like a company with tons of IT work - they have a legacy system where they keep all their customer data since forever, and they just need someone to maintain it. At the same time, it doesn’t feel like I’m doing the right thing. I mean, right now, once I get the specs, I run it through my program - then every week or so, I tell them I’ve completed some part of it and get them to test it. I even insert a few bugs here and there to make it look like it’s been generated by a human.

There might be amendments to the spec and corresponding though email etc, but overall, I spend probably 1-2 hours per week on my job for which I am getting a full time wage.

I really enjoy the free time but would it be unethical to continue with this arrangement without mentioning anything? It’s not like I’m cheating the company. The company has never indicated they’re dissatisfied with my performance and in fact, are getting exactly what they want from employing me.

I recently graduated from university and landed a job as a junior devops engineer.

There’s so much tech stacks to learn and I’m in the process of converting a legacy CI system composed of only bash scripts to Python and I feel that 8 hours a day isn’t enough and I often feel that after working hours, I should be reviewing more so that the next day I can be more productive.

I am given tasks to do but I keep feeling the pressure that I need to prove myself.

Is this normal? I’m not used to this learning pace.

I need to make a legacy Java monstrosity asynchronous and came across a class which is currently making me cry blood.

It took our whole team 5 days to figure out how this thing works, including the weekend. At one place, It is adding an empty list, to another list.

The magic here is that if I remove the statement assigning data to the sub list, the data is still somehow being populated in the root list.

This clusterfuck somehow works in single threaded processing, but as soon as I make this multi threaded, all hell breaks loose.

Please send help!!

I’ve become so indecisive in terms of knowing what I want from my career.
All I know is what I don’t want (to end up a in management)

I’m definitely getting a new job and right now it looks like I’ve got 3 offers on the table

Option 1, a previous company I worked for. Still the same problems with the company there as before but the work was interesting and unusual. and my line manager was a good guy.
They have practically no legacy code.
Not much in the way of company benefits but they’re local and it would be nice to see friends again.
So feels like the pull to this is strong.

Option 2, a fully remote company that I’ve been referred to by an ex-workmate.
They’ve not even tech tested me because they’ve read my blogs and GitHub repos instead and said they’re impress. So just had a conversation with them. I feel honoured that they took the time to look at what I’ve done in my own time and use that in their decision.
Benefits are slightly better than option 1 (more hols)
But they’re using .net 6 and get a lot of heavy use on their system and have some big customers. I think the work is integrations to start with and moving services into docker and azure.

Option 3, even though I’ve got an offer from this one but they can’t actually explain the work until We can arrange a call next week (they recruit and then work out what team your in, but Christmas got in the way of me having a call with them straight away)
It’s working on government systems and .net is their least used stack so probably end up switching to Java. Maybe other tech stacks too.
This place has much better benefits than option 1 and 2 (more hols and more pension), but 2 days a week in office.

All of the above pay the same salary.

Having choice feels almost as bad as having no choice.
It’s doing my head in thinking about it , (even tho I might as well not think about it at all until the call with option 3 happens).

On the one hand with option 3, using a tech stack that’s new to me might be refreshing, as I’ve done .net for 10 years.

On the other hand I really like c# and I’m very good at it. So it feels a bit like I should be capitalising on that and using my experience to shape how the dev is done. Not sure I and I can do that with option 3, at least for a while.
C# feels like it’s moving forward nicely and I’m not sure I can say the same for Java or other languages.

I love programming and learning new stuff but so unable to let things go. It’s like I have a fear that c# will move on without me and I’ll end up turning into one of those devs whose skills are a decade out of date.

Maybe the early years of my career formed me in this way.
Early on I worked at a company where there was a high number of Cobol devs who thought they had a job for life.
But then redundancies came and many left. Of those who stayed they had to cross train to Java and they just couldn’t do it.

I don’t think the tech was hard for them, I think they were just so used to not learning that they could no longer adapt.
Think most of them ended up retiring after trying to learn Java for a few years.

About a year ago I had the great idea to enforce ago I had the great idea of proposing that we all lint our legacy code base using eslint to increase the overall quality of our JS.
I distributed the task of initially fixing all the errors eslint would find to the whole Frontend team (Luckily we only use JS there). I've finished my part in a couple of weeks and came across this piece of spaghetti.
One of the guys who has been with the company for over 10 years said, that the guy who wrote this monster was very proud of it...
In case you cannot understand what this does: It calculates the distance between 2 points on earth.

♫ It's high time we reviewed our design, ♫
♫ The code behind our system is just too byzantine, ♫
♫ We'll rewrite all the legacy and take it off line, ♫

How do you pick a new language to learn?

I am a C# developer and at work I work on desktop apps and legacy web services etc.

I fancy learning something else so I can have a bit of variety when working on personal projects etc.

I am doing a distance learning degree which has used Java and Python so far, with some PHP and JS etc to come later.

I’m drawn to Ruby as I already have experience there, but I was also thinking about looking at Node as that covers back end and front end all using JS which is definitely useful in general as I look at moving to a more web based role.

What have you suggested at work which sounded like a good idea at the time, but now sounds like a nightmare?

I inherited a nasty old legacy c# desktop app a few years ago, I was a sql developer so it was a steep learning curve, but I’ve tried to make it better, fixing things as I go.

I had the bright idea of mentioning that I would look at starting to add unit tests etc.

It seemed like a good idea at the time, but now I’m not so sure.

Every single morning I despair. I can’t stand this job.
Why pay very highly and get very skilled people to have them working 4 to a support ticket. Doing the most mundane support tickets you have ever seen in your life (mainly updating client contact details)?
And why have such a rigorous recruitment process to get people’s in in the first place?

The company is pissing money away by working like this and all the new starters like me think it’s complete shit.
But the bosses and anyone who’s been here a while think it’s great. Company still is making loads of money so they don’t even care about it.

I’ve never met senior developers who have never worked on a greenfield project in their entire careers until I came here.

I can’t believe how I got suckered into this (was head hunted).

Does anyone have a feel for the UK contracting market right now?

I’m considering the jump but I think I’d have to be looking for remote only contracts because where I live has few opportunities ‘on-site’. Preferably c# / angular.

Is there much competition for roles or is there a shortage of skills in the contractors?

The thought of going into another permanent role that could be as bad as this genuinely keeps me awake at night.
I’m not sure I can go somewhere and then have it in the hands of managers to decide what projects I’m going to do and what tech it will be on.

At any big company there’s going to be tech debt as well as new work. So becoming perm now feels like it’s 50-50 whether or not a new job will just mean being put into legacy stuff for a couple of years or doing something that is actually good.

I’ve been talking various people about roles in government departments (multiple different departments are hiring) and because priorities change none the gov recruiters can guarantee what the work is that they’re recruiting for actually is.
Just that the the big recruitment push is to bring work previously done by consultancies back in house. Presumably because consultancies have been fleecing them.

Big ass company paying me fat stacks to remake their 3 important legacy projects (hospitals, gov, big companies) into another stack.
Will require me to no-life.

Or chill local medium sized company which creates apps to help museums, education and other wholesome shit.

Feels like i need to choose the big one because "carreer" but i am haunted by all the burn-out horror stories online.

Currently on my way to the latter for my last interview with them.

I've been asked to release a project which has been written by someone else, then rewritten by another developer, and both have left the company.

I can't release it yet because there is an inconsistent bug throwing some values out.

We've got it running side by side with an older legacy system which it's going to replace. Before the 2nd developer left they added some logging to our live system to record both values so that they could be monitored to make sure there was no inconsistency.

There are some inconsistencies... however, when I run the same data through the new system and the legacy system in a test environment they both come out correct.

FML

I've considered quitting...

Can a React.JS expert help me to understand something?

In short, I would like to know what are the main differences between react version 15.6 and 17, in terms of browser issues, and component compatibility?

We have a legacy code base that is in version 15.6 and the team wants to upgrade it and I am attempting to argue with my dumb CTO to upgrade to version 17. However, I’m not versed in react, I'm just a PO and the CTO doesn't know anything but for some odd reason is adamant about staying on an older version. The developers gave me their opinion but I'm interested in an outside opinion.