Job switching among South Korean semiconductor workers has fallen by roughly half, even as postings for experienced hires surged 157%, according to data reported by BigGo Finance. The figures describe a labor market in which chip companies cannot find seasoned engineers because the engineers they want are staying put.

The pattern is what BigGo Finance calls talent "lock-in." Demand for experienced semiconductor professionals is rising sharply. Supply of those professionals, measured by actual job moves, has collapsed by about 50 percent. The 157 percent surge in postings makes the imbalance legible: employers are advertising far more roles than the market is filling through voluntary mobility.

What do the numbers show?

BigGo Finance's report, focused on South Korea, ties the phenomenon directly to the semiconductor boom. Two figures anchor the story:

• Job switching in the sector has halved, meaning about one in two moves that previously occurred no longer happens.
• Postings for experienced hires have risen 157 percent, a figure that measures employer demand rather than successful placements.

Read together, the two numbers point in opposite directions, and that is the point. Demand-side signals are expanding while supply-side mobility contracts. Markets resolve such gaps through price or through retention. The data suggest South Korean chip employers are relying heavily on the second mechanism.

Why does lock-in matter for chip supply chains?

South Korea hosts two of the world's largest memory producers, and the country's semiconductor output is a central pillar of the global memory supply. When experienced engineers stop moving between employers, the effect concentrates expertise inside incumbent firms. Startups, second-tier suppliers, and new entrants face a thinner pool of proven talent precisely when the boom raises demand for it.

The 157 percent figure is the strongest signal in the report. It is a posting count, not a hiring count. It therefore measures intent and budget rather than completed recruitment. The halved switching rate, by contrast, measures actual behavior. The gap between a 157 percent rise in postings and a 50 percent fall in switching is the quantitative definition of a talent shortage at the experienced tier.

Who holds the advantage?

Incumbent employers do, under current conditions. A worker who stays is a worker a competitor cannot hire, and retention becomes a competitive weapon in its own right. For the largest firms, lock-in protects institutional knowledge in process engineering and manufacturing, areas where experience compounds over years and cannot be bought quickly.

For smaller firms and challengers, the same data describe a hostile recruiting environment. Posting volume has more than doubled, yet the pool of people willing to move has shrunk. Each experienced-hire vacancy becomes harder and slower to fill. The burden of proof shifts onto compensation, and the report's figures imply that offers must now work harder to dislodge a candidate than they did before the boom.

Is this a bubble signal or a structural shift?

The report frames the boom as the driver, not a speculative excess. The lock-in dynamic follows from the boom rather than contradicting it: firms expand posting budgets because demand for chips supports expansion, and workers stay because their current positions improve with the cycle.

That linkage cuts both ways. If the boom moderates, retention pressure may ease as outside options narrow and posting volumes fall back from the 157 percent peak. If the boom persists, the scarcity of mobile experienced engineers tightens further, and the competition for the small number who do switch intensifies among the firms still adding postings.

BigGo Finance's data cover South Korea specifically. The country's concentration of memory manufacturing makes its labor conditions a leading indicator for the wider memory supply chain, since staffing constraints at fabrication and process engineering levels translate into capacity and ramp risk downstream.

The report does not forecast an end to the imbalance. With switching halved and postings up 157 percent, South Korea's semiconductor labor market will likely stay tilted toward incumbents until either demand cools or a new cohort of experienced engineers emerges to widen the mobile talent pool.