E-4 Technology Transfer Visa Korea — Foreign Technical Experts & Industrial Know-How
The E-4 (기술지도) visa is issued to foreign specialists who come to Korea to transfer industrial technology, proprietary technical know-how, or specialized production methods to a Korean company or institution. E-4 is primarily used by multinational companies transferring specific technologies to Korean affiliates, joint ventures, or licensed manufacturers.
Written by James Chae — Co-Founder, Expert Sapiens
Platform expertise: Immigration consulting & visa services · Reviewed July 2026
Review & source basis
Reviewed against
James Chae, 행정사 (Korean Licensed Administrative Attorney). License No. 220-06-06463 · 대한행정사회 (Korean Administrative Agents Association). Reviewed against the HiKorea 사증·체류업무 자격별 안내 매뉴얼 and cross-checked with Ministry of Justice issuances.
Last reviewed
July 14, 2026
Source references
Filing caution
Requirements can change by nationality, local immigration office, and filing channel. Confirm exact requirements with HiKorea, the responsible Korean consulate, or a licensed immigration specialist before filing.
What is 'technology transfer' under E-4?
E-4 covers a foreign expert coming to Korea to: • Transfer proprietary manufacturing processes or industrial know-how to Korean employees • Provide technical guidance during installation of specialized industrial equipment • Train Korean engineers on the operation of patented or licensed technology • Provide onsite troubleshooting under a technology licensing agreement
Key principle: The technology being transferred must be proprietary to the foreign specialist or their company. A software engineer teaching general Python programming does not qualify for E-4. A specialist from a German machinery manufacturer commissioning a proprietary CNC system at a Korean factory under a licensing agreement does qualify.
Technology transfer agreement: A formal contract between the Korean company and the foreign entity is almost always required.
Eligibility and required documents
For the specialist: 5+ years in the field, formal role at the technology-holding company, credentials demonstrating expertise.
For the Korean company: A formal technology transfer or licensing agreement as the legal basis.
Key documents: • Appointment letter from the foreign technology-holding company • Technology transfer agreement between the foreign and Korean company • Korean company's business registration certificate • Detailed description of the technology and training plan • Technical credentials: degree, professional licenses, patents, work history • Criminal background check (apostilled)
Duration: 3 months to 1 year, project-based. Extensions possible if ongoing.
E-4 vs E-3 vs E-7
| E-4 Technology Transfer | E-3 Research | E-7 Specialty Occupation | |
|---|---|---|---|
| Core activity | Transferring proprietary technology | R&D employment | Skilled employment |
| Legal basis | Technology transfer agreement | Research contract | Employment contract |
| Duration | Project-based (defined) | Contract-based | Ongoing |
| Proprietary tech required? | Yes | No | No |
German turbine specialist at a Korean plant for 6 months under a licensing deal: E-4. Same specialist staying as a full-time engineer: E-7.
Tips from 행정사s
The technology transfer agreement is the cornerstone document for E-4 — invest time in having it clearly drafted before applying.
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Alien Registration Card (ARC)
The Alien Registration Card (ARC) is the official ID card issued to foreigners staying in South Korea for 91 days or longer. It is required to open a bank account, sign a phone contract, and access most public services.
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HiKorea
How to use HiKorea (www.hikorea.go.kr) — Korea's official immigration portal for visa extensions, status changes, and ARC renewal. Processing time: 3-10 business days.
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Visa Extension (Stay Period Extension)
A visa extension — officially called a 'stay period extension' (체류기간 연장) in Korean immigration law — allows a foreigner to legally remain in Korea beyond the expiry date on their current visa or ARC without leaving the country.
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Status of Sojourn Change (체류자격 변경)
A status of sojourn change allows a foreigner already in South Korea to switch from one visa category to another without leaving the country — for example, from a D-2 student visa to an E-7 skilled worker visa upon graduation and employment.
Frequently asked questions
Can a freelance technical consultant get E-4?
Potentially yes, if the consultant has a formal technology transfer contract with a Korean company and possesses proprietary or highly specialized technical knowledge. A generic IT consultant typically needs E-7; a specialist with patented technology under a formal licensing arrangement has a stronger E-4 case.