Most sourcing problems don’t announce themselves. A supplier rarely says “we can’t actually do this.” Instead, the warning signs show up quietly — in how they answer questions, what they avoid showing you, and small inconsistencies between what they say and what the paperwork says.
After 20 years working supply chains for Hyundai-Kia, Renault-Nissan, and joint venture projects with companies like BHP and Rio Tinto across Kazakhstan and Australia, these are the specific things that make me slow down before recommending a supplier.
1. Vague — or nonexistent — answers about who actually makes the product
If a company can’t clearly explain which parts of the process happen in-house versus subcontracted, that’s the first flag. More often, they simply don’t mention it at all. I’ve seen companies bring in subcontracted engineers or workers to their own headquarters right before an audit, so they can sit in for the visit as if they were regular staff.
Subcontracting itself isn’t the problem — plenty of legitimate manufacturers subcontract specific processes and disclose it openly, working as genuine partners with those subcontractors. The real issue is subcontracting done to cut costs while also shifting the cost and liability of any quality failure onto the subcontractor, and then hiding the arrangement from the buyer.
2. Photos that don’t match the visit
Marketing photos showing clean, modern equipment, but the actual facility looks different, is running older machines, or is clearly smaller than implied. I’ve walked into “factories” that were really small workshops subcontracting the real production elsewhere.
3. Reluctance to share basic corporate information
A legitimate Korean manufacturer will not hesitate to share its business registration number, corporate registration details, or basic company history. Hesitation here — vague answers, delays, “we’ll send it later” that never arrives — is one of the clearest signals something is being hidden.
4. Recent, unexplained ownership changes
Corporate registries show ownership history. A recent change in directors or majority ownership isn’t automatically bad, but if the company doesn’t volunteer an explanation when asked directly, that’s worth pausing on. Sometimes it’s a normal succession. Sometimes it’s someone stepping in right before a company was going to collapse under the previous owner.
5. Payment terms that don’t follow a clear structure
In export deals, payment terms need to be spelled out clearly upfront, or they become a source of dispute later. A typical structure looks like this: because material has to be ordered as soon as production is scheduled to start, the supplier usually collects 50–60% as a deposit after the PO is received, another 20% or so as a progress payment during production, and the remaining balance once shipping documents and supporting evidence (photos, etc.) are sent before shipment. Some buyers negotiate holding back a final 5%, releasing it only after the equipment is received, installed, and confirmed to be working properly.
A supplier pushing hard outside this standard structure — demanding full payment before shipment on a brand-new relationship, or refusing any milestone-based structure at all — is a flag worth weighing alongside everything else on this list.
6. Revenue concentrated in one or two customers
If your prospective supplier’s business is heavily dependent on one or two major buyers, ask what happens if that relationship changes. A company that loses 50% of its revenue overnight is a company that may not survive to finish your order — regardless of how good their factory looks today.
7. Quality documentation that’s inconsistent or incomplete
Ask for their quality control process documentation, inspection records, or certifications, and watch how complete and consistent the response is. Gaps, contradictions between what different staff tell you, or documents that look freshly created rather than part of routine operations are all signals that quality control is a presentation, not a practice.
8. No clear escalation process when problems happen
Ask directly: “If a quality problem comes up mid-production, what happens?” What you’re really checking is how quickly the PM or manager on the ground reports the issue up to company leadership, and whether the company can actually mobilize a response within 24 hours. A supplier with a clear reporting line and a defined response process is a fundamentally different partner than one that improvises every time something goes wrong.
9. No real timing schedule or documented follow-up process
Serious manufacturers manage delivery against a formal timing schedule — not just a target date. Ask whether this document actually exists, and whether it includes a remarks column where problems and the actions taken are logged as they happen. Ask if issues get discussed in internal meetings, and whether there’s a record — meeting minutes, a resolution log — of how those issues were closed out. If a problem gets solved, does the resolution actually get written back into the remarks column on the schedule? This tells you whether a company manages its timeline on paper only, or actually runs on it.
10. Financial strain signals that don’t match the sales pitch
This is the one buyers miss most often, because it doesn’t show up on a factory visit. Late payments to their own suppliers, delayed tax filings, frequent changes in banking relationships, or heavy short-term debt against fixed assets — these are financial-record signals, not factory-floor signals. A company can look completely healthy in person and still be under serious financial strain. This is exactly why financial due diligence and factory audits need to happen together, not as substitutes for each other.
None of these are automatic disqualifiers
To be clear — a single flag on this list doesn’t mean walk away. Companies subcontract for good reasons. Ownership changes happen for normal reasons. Payment terms can reasonably vary depending on the project. The point isn’t to treat every flag as fatal. The point is to ask the direct question, get a direct answer, and see whether the explanation actually holds up.
The suppliers I trust most are usually the ones who answer these questions without hesitation — not the ones with a perfect-looking factory and no good answer when something doesn’t quite line up.
This is part of a series on sourcing and project management in Korea, based on direct experience managing manufacturing and industrial projects across automotive and heavy industry supply chains.
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