In a new role where I'm given very little guidance and feel like I was thrown into the deep end. I was given an assignment with minimal walkthrough that requires me to have existing knowledge (which I obviously don't have because I'm new). I've voiced my concerns but feel like it has fallen on deaf ears. I'm overwhelmed and heading towards burnout working long hours + some weekends trying to meet my deadline but definitely won't be done by then. Any advice on how to navigate this?

sorry you are going through this. it's happened to me in the past and I feel like it's no surprise as I am known to be reliable and plough through even if the workload and expectations are unreasonable. I wonder if it's also no surprise that this is typically done to women who typically want/need to prove themselves more, but I digress.
My recommendation: reiterate your worries in writing by email to the people you've already spoken to, starting with 'as mentioned back in [date]...' and make sure to spell out that you pull in extra time ('fear of burnout as outcome' is up to your discretion) and despite this the deadline won't be met. Save this and every email that follows. I imagine that there is probably a list of people that you need to warn in priority before you escalate to other key stakeholders, so follow your best judgement and do just that. I imagine your manager or project lead are amongst the first to be informed. if no action is taken, it will therefore be their fault and no yours. Trust me: document everything (even a verbal discussion can be summarized and sent by email) bc even if you do a stellar job despite the situation and miss the deadline, they won't hesitate to throw you under the bus. Keep your head high and have no doubt in your head about your worth, skills and abilities when you discuss the issue: you tell them the issue and it's outside of your control (it's not up for debate). best of luck and sorry you are going through this.

This seems so prevalent, sorry you’re going through this. I didn’t read all the comments but is there a senior analyst you can grab time with to be mentored? Or 1:1s to ask specific questions? The lack of training at so many companies is concerning. We get new roles and have to teach ourselves.

Temp or perm role? Sometimes being hired in Q4 sounds exactly like this whether temp or perm. Did the last person in the role provide any guidance via documentation regarding onboarding process? As far as hours only you can raise those concerns with proof of long hours etc. I would have a 30 day action plan. I would also set up a 1:1 with your boss with your concerns. Again, what was the expectation of the last person in the role? If it’s under 90 days based on experience. I would resign. I had to walk away from two jobs temp & perm because the red flags 🚩 I saw in the beginning regarding lack of WLB was the second reason I left. The first was a toxic boss. Granted I resigned once I landed a new role. Contract l literally just left within 30 days. See what changes in Q1 after meeting with your boss. By February I would resign. It’s early enough to be left off the resume.

I'm in a role like that currently, though I had some industry knowledge. They told me during the interview that I'd get to help with "program design". I found there wasn't much "program" already designed, so I rolled up my sleeves and did the work. The project team had pieces... but no one had bothered to see if they all fit together or made any sense in the real world. There were 2 of us on that program... and my teammate described it as his first "big boy job". It's been 2 years.... and now they're going to outsource it (and rearrange the whole team bc we're failing badly). My part of it - no goals that I could measure and given the nature of it, it's very dependent on the economy and if businesses are doing upgrades (it's not solar lol), so it's been a rough 6 months on that score, too. And this transition - I have no real info and am now expected to do 2 jobs. The moral of the story - don't wait for them to wake up, they won't. They may throw you out like the trash, despite your best efforts. Look after your own well being: this isn't the era of gold watches and 40 year jobs. Protect yourself, no one else will.

I have been there. It happened in the pandemic. 2 options. You can find another job and the second one, is to fight, start asking different people, make a puzzle and start making your mark, after a couple of months you will be doing great at your job, believe me..the funny part is that all of the people that did not give you a hand will say things like they always believed in you.
You got this! Show them what you have!

Do your best work, but don't overextend yourself.
The worst thing you can do is to commit and not deliver.
When you respond to an assignment, document your thoughts and your limitations.
For example:

Hi John,

I hope this message finds you well. I'd like to address the recent assignment, noting that this is my initial experience with the software. Although I've requested training, I'm still waiting for it. In the meantime, I've proactively familiarized myself with the system, leveraging its similarities to the ABC software I've previously used. To enhance my understanding, I've completed online courses [link] and thoroughly studied the manual [link]. I believe these efforts have enabled me to successfully complete the assignment.

However, to ensure the highest quality of work, I would greatly appreciate your expertise in reviewing my results. Your feedback would be invaluable, especially at this early stage, allowing me to make any necessary adjustments promptly. If possible, I would be very grateful for the opportunity to discuss my findings with you over a call. Your guidance would be a significant learning experience for me.

Please let me know a convenient time for you to have this discussion. Your support in this matter is highly appreciated.

Best regards,
[Your Name]

I’d genuinely make an action plan of how you think you can make the deadline and flag what’s missing at present eg is it subject matter expertise (could a senior lead step in to guide you every few days), is it capacity (do you need some extra resource you can manage and work with to get you to finish line, is it client changing scope and expectations of deliverable?

Once you have the root problem you can then suggest some solutions and not feel alone.

It’s okay to say you need help and can’t do it alone - I’d always rather my team did that then trundled through to finish line without wellbeing or deliverable intact.