How to understand a confusing legacy software system you inherited
Inheriting unfamiliar legacy software with poor documentation and unconventional design leaves you trapped doing archaeological work instead of actual development. Without automated tests or clear guides, you are left merely putting out metaphorical fires and feeling completely lost during on-call shifts. This lack of comprehension makes it impossible to speak deeply on the codebase and threatens to stall your career.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Asking colleagues or online forums for help or historical context about legacy systems
- 2Adjusting expectations and accepting that simple support questions might take hours of digging
- 3Reverse engineering requirements through usage and testing
- 4Using AI and static analysis tools to understand code modules
- 5Conducting reverse knowledge transfer sessions where the team documents their understanding for validation
- 6Delaying the introduction of bank feeds for the first month of training to focus on traditional manual structure
- 7Completely disabling bank feeds and booking transactions manually based on statements
- 8Excluding app integrations and manually entering everything through the bank feed
- 9Refusing to take on clients who use cloud accounting platforms
- 10Migrating or looking into alternative platforms like Xero or Sage's cloud system
- 11Spending the weekend studying reference themes and basic template syntax instead of trying to learn everything.
- 12Going hands-on to set up a full working store quickly by trying to recreate a previous project.
- 13Experimenting with custom queries for customer segmentation
- 14Automating performance reports and sending them to Slack or email
- 15Analyzing past campaign and sales performance data
- 16re-wiring neuro pathways over a few weeks until it becomes second nature
- 17studying SuiteAnswers articles and going through the help center
- 18investing time to learn how to customize forms, create saved searches, and build custom reports
- 19adapting business processes to use out-of-the-box functionality instead of custom modifications
- 20Waiting for administrators to try features first before rolling them out by role
- 21Clicking new release banners or asking account managers or sales representatives
- 22Searching the help menu or documentation portal for prefix guides
- 23Typing the first few letters of a record type's name
- 24Using keyword shortcuts like 'new' combined with a term in the search bar
- 25Using scheduled middleware integration flows that run periodically every 15 minutes instead of real-time webhooks
- 26Searching for one-on-one meetings with knowledgeable individuals and reading documentation or watching tutorial videos.
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Have a new account that refuses to use excel or just about any software Ive used before. They swear by this being more efficient and user friendly but I’m completely lost. Anybody seen this before?”source ↗
“You’ll double-enter revenue. You’ll double-enter expenses. You’ll “match” things that aren’t matches. And you’ll feel like you’re bad at bookkeeping.”source ↗
“We recently went live on NetSuite and I’m trying hard to keep an open mind, but I honestly need a reality check from people who’ve lived in it longer than a few months.”source ↗
“In NS, I feel like simple tasks require way too many clicks, tabs, mappings, validations, uploads, approvals, etc.”source ↗
“Has anyone here actually found a useful use case for their email marketing platform's MCP with Claude or ChatGPT?”source ↗
“I feel like I'm underusing MCP. I'm not talking about writing subject lines or email copies, that's the obvious stuff. I'm more curious about the practical use cases, especially for Shopify stores.”source ↗
“I've seen more email marketing tools adding MCP support lately, but I don't see many people talking about how they're actually using it day to day.”source ↗
“Would love to steal a few ideas because I feel like I'm barely scratching the surface.”source ↗
“I've recently joined a team taking over a supposedly profitable software product of dubious quality (Poor documentation, lack of automated tests, unconventional coding conventions, high complexity, etc) from a startup acquisition, as an individual contributor software developer.”source ↗
“We hardly have the expertise that when we take over on call, whoever's on shift feels comfortable handling whatever could happen.”source ↗
“We can barely comprehend the product, algorithms and design choices, etc. and I worry this will hurt my career, being unable to speak deeply on these topics and my work experience besides putting out metaphorical fires and archaelogical work.”source ↗
“Anyway, I can't tell if this is something that is just going to be a part of base NetSuite or if it's a separate thing you have to enable.”source ↗
“How are you supposed to know if it's even available to you?”source ↗
“Is it one thing that you enable, or is it a bunch of disparate things you have to enable individually?”source ↗
“We have recently migrated to Netsuite and I completely agree with your points.”source ↗
“CSV uploads just seembso much harder than they need to be. I feel intercompany was much more user friendly on our older system.”source ↗
“THANK YOU. Validating to know that my frustration with QBO feeling like mashed together cash and accrual has been experienced by people with much better handles on bookkeeping processes than me.”source ↗
“However, I am not able to find any way to create an event subscription the way the articles suggest (Customization -> Scripting -> Event Subscriptions)”source ↗
“Are these articles a bunch of junk? Or am I missing something very obvious within Netsuite?”source ↗
“The new UI is utter dogshit and not intuitive if you have any experience at all. Add in the AI tools being forced upon us my company is going to look into what would be best to switch clients to after tax season.”source ↗
“Netsuite is not as intuitive as ms 360 ir other new erp, but it is still the most highly customizable. When i was new to it, it really felt clunky and all over the place.”source ↗
“Where can i find a master list of search prefixes?”source ↗
“I share the feeling that we're probably missing some of the bigger possibilities here.”source ↗
“I require a 50% proficiency in this tool within three days. I would greatly appreciate the assistance of a one-on-one meeting with an individual possessing in-depth knowledge of its functionalities.”source ↗
“I just started a new job and they are all about Workfront, so it’s critical I get up to speed fast. I’m finding all the trainings to be a little high level. Has anyone had experience with Workfront and have suggestions on how to get up to speed quickly?”source ↗
“I am having an interview about shopify web design. I have experience with webflow but not with shopify. I think I could learn fast, but lately it's hard to get hired without knowing everything to the dot and needing learning time.”source ↗
Where this came up
People with this problem also raised
- 3Why can't accountants open Apple Numbers files?
- 13Why do Microsoft software updates and account errors break everything?
- 3Why is classroom quiz software so cluttered now?
- 7Why is there no CRM with native AI insights out of the box?
- 3Vendor forced us from perpetual licenses to a subscription
- 8Why built-in software AI features don't fit real work