Introduction
An internship letter for job experience validation is a critical document for professionals in Indonesia, especially as the job market becomes increasingly competitive. These letters serve as official confirmation of an individual’s internship experience, detailing their responsibilities, achievements, and the skills gained during their tenure. For 2026, understanding the importance and structure of these letters is essential for both interns and employers alike.
1. Internship Completion Certificate for Marketing Intern
PT. MegaCorp Indonesia
Jl. Sudirman No. 123
Jakarta, 10220
Indonesia
Jakarta, 15 March 2026
Certification of Internship Completion
This is to formally certify that Ms. Aisyah Dewi successfully completed her internship program in the Marketing Department of PT. MegaCorp Indonesia from January 2026 to March 2026. During her tenure, she demonstrated exceptional skills in digital marketing and contributed significantly to our Q1 campaign strategy.
Please feel free to contact us at +62 21 1234 5678 for any further verification.
Sincerely,
Mr. Rudi Hartono
HR Manager
2. Internship Experience Validation for Engineering Intern
PT. TechnoSolusi Indonesia
Kawasan Industri MM2100
Cikarang, 17520
Indonesia
Cikarang, 10 April 2026
Confirmation of Internship Experience
We are pleased to confirm that Mr. Budi Setiawan completed his engineering internship at PT. TechnoSolusi Indonesia from February 2026 to April 2026. He was instrumental in assisting our team with the development of the new automated assembly line system.
For further details, please contact our HR Department at +62 21 2345 6789.
Best regards,
Ms. Lestari Wahyu
Engineering Manager
3. Internship Letter for Finance Department Intern
PT. Financial Solutions Indonesia
Menara Jamsostek, 12th Floor
Jl. Gatot Subroto No. 38
Jakarta, 10200
Indonesia
Jakarta, 20 May 2026
Internship Experience Validation
This letter confirms that Ms. Dina Widyastuti served as an intern in the Finance Department of PT. Financial Solutions Indonesia from April 2026 to May 2026. She played a key role in assisting with budget planning and financial reporting.
For any verification, please contact us at +62 21 3456 7890.
Yours faithfully,
Mr. Andi Setiawan
Finance Manager
4. Internship Completion Letter for HR Intern
PT. HR Solutions Indonesia
Wisma 77, 7th Floor
Jl. S. Parman No. 77
Jakarta, 11410
Indonesia
Jakarta, 25 June 2026
Certification of Internship Completion
This letter certifies that Ms. Cinta Kusumawardhani successfully completed her internship in the HR Department of PT. HR Solutions Indonesia from May 2026 to June 2026. She contributed significantly to our employee onboarding process and recruitment drives.
For further inquiries, please contact us at +62 21 4567 8901.
Best regards,
Ms. Rina Andriani
HR Manager
5. Internship Experience Confirmation for IT Intern
PT. TechInnovators Indonesia
Jl. Raya Pasar Baru No. 50
Bandung, 40211
Indonesia
Bandung, 30 July 2026
Confirmation of Internship Experience
We are pleased to confirm that Mr. Dwi Cahyo completed his internship in the IT Department of PT. TechInnovators Indonesia from June 2026 to July 2026. He was actively involved in developing and implementing new network security protocols.
For any verification, please contact us at +62 22 1234 5678.
Sincerely,
Mr. Adi Nugroho
IT Manager
6. Internship Validation Letter for Sales Intern
PT. SalesPro Indonesia
Jl. HR. Rasuna Said No. 12
Jakarta, 12940
Indonesia
Jakarta, 10 August 2026
Validation of Internship Experience
This letter confirms that Ms. Elsa Fitriani served as an intern in the Sales Department of PT. SalesPro Indonesia from July 2026 to August 2026. She demonstrated exceptional skills in client relationship management and sales strategy development.
For further details, please contact us at +62 21 2345 6789.
Yours faithfully,
Ms. Winda Sari
Sales Manager
7. Internship Experience Letter for Operations Intern
PT. OperationsExcel Indonesia
Jl. Gajah Mada No. 100
Surabaya, 60234
Indonesia
Surabaya, 20 September 2026
Confirmation of Internship Experience
We are pleased to confirm that Mr. Bagus Prasetyo completed his internship in the Operations Department of PT. OperationsExcel Indonesia from August 2026 to September 2026. He was instrumental in optimizing our supply chain management processes.
For any verification, please contact us at +62 31 1234 5678.
Best regards,
Mr. Heru Susanto
Operations Manager
8. Internship Completion Letter for Graphic Design Intern
PT. CreativeDesign Indonesia
Jl. Sudirman No. 456
Bandung, 40111
Indonesia
Bandung, 25 October 2026
Certification of Internship Completion
This letter certifies that Ms. Lestari Putri successfully completed her internship in the Graphic Design Department of PT. CreativeDesign Indonesia from September 2026 to October 2026. She contributed creatively to our branding and marketing materials.
For further inquiries, please contact us at +62 22 2345 6789.
Yours sincerely,
Ms. Anisa Nurmalasari
Creative Director
9. Internship Experience Validation for Legal Intern
PT. LegalAid Indonesia
Jl. S. Parman No. 200
Jakarta, 11470
Indonesia
Jakarta, 30 November 2026
Confirmation of Internship Experience
We are pleased to confirm that Mr. Andika Wahyu completed his internship in the Legal Department of PT. LegalAid Indonesia from October 2026 to November 2026. He assisted in drafting legal documents and conducting case research.
For any verification, please contact us at +62 21 3456 7890.
Best regards,
Ms. Sri Wahyuni
Legal Manager
10. Internship Letter for Customer Service Intern
PT. CustomerCare Indonesia
Jl. Raya Jogja No. 789
Yogyakarta, 55111
Indonesia
Yogyakarta, 10 December 2026
Validation of Internship Experience
This letter confirms that Ms. Ayu Lestari served as an intern in the Customer Service Department of PT. CustomerCare Indonesia from November 2026 to December 2026. She demonstrated excellent communication skills and improved client satisfaction rates.
For further details, please contact us at +62 274 1234 5678.
Yours faithfully,
Mr. Bambang Sutrisno
Customer Service Manager
11. Internship Experience Letter for Environmental Intern
PT. GreenEarth Indonesia
Jl. Raya Bogor No. 123
Bogor, 16111
Indonesia
Bogor, 15 January 2026
Confirmation of Internship Experience
We are pleased to confirm that Ms. Dewi Puspita completed her internship in the Environmental Department of PT. GreenEarth Indonesia from December 2025 to January 2026. She contributed to our sustainability projects and environmental audits.
For any verification, please contact us at +62 251 1234 5678.
Best regards,
Mr. Tono Sulistyo
Environmental Manager
12. Internship Completion Letter for Logistics Intern
PT. LogisticsPro Indonesia
Jl. Gajah Mada No. 789
Surabaya, 60234
Indonesia
Surabaya, 20 February 2026
Certification of Internship Completion
This letter certifies that Mr. Eko Prasetyo successfully completed his internship in the Logistics Department of PT. LogisticsPro Indonesia from January 2026 to February 2026. He was actively involved in optimizing our delivery routes and inventory management.
For further inquiries, please contact us at +62 31 2345 6789.
Sincerely,
Ms. Retno Widyastuti
Logistics Manager
13. Internship Experience Validation for R&D Intern
PT. ResearchInnovators Indonesia
Jl. Sudirman No. 456
Jakarta, 10220
Indonesia
Jakarta, 25 March 2026
Confirmation of Internship Experience
We are pleased to confirm that Ms. Fitri Wahyuni completed her internship in the R&D Department of PT. ResearchInnovators Indonesia from February 2026 to March 2026. She contributed to the development of new product prototypes and research initiatives.
For any verification, please contact us at +62 21 3456 7890.
Best regards,
Dr. Ir. Andi Setiawan
R&D Manager
14. Internship Letter for Public Relations Intern
PT. PRConsultants Indonesia
Jl. S. Parman No. 321
Jakarta, 11470
Indonesia
Jakarta, 10 April 2026
Validation of Internship Experience
This letter confirms that Ms. Gita Sari served as an intern in the Public Relations Department of PT. PRConsultants Indonesia from March 2026 to April 2026. She demonstrated strong media relations skills and assisted in organizing corporate events.
For further details, please contact us at +62 21 4567 8901.
Yours faithfully,
Ms. Lestari Nugroho
PR Manager
15. Internship Experience Letter for Quality Control Intern
PT. QualityAssurance Indonesia
Jl. Raya Cikarang No. 123
Cikarang, 17520
Indonesia
Cikarang, 20 May 2026
Confirmation of Internship Experience
We are pleased to confirm that Mr. Bambang Wijaya completed his internship in the Quality Control Department of PT. QualityAssurance Indonesia from April 2026 to May 2026. He was instrumental in improving our quality assurance processes and conducting audits.
For any verification, please contact us at +62 21 1234 5678.
Best regards,
Mr. Tono Sutrisno
Quality Control Manager
16. Internship Completion Letter for Administrative Intern
PT. AdminPro Indonesia
Jl. HR. Rasuna Said No. 456
Jakarta, 12940
Indonesia
Jakarta, 25 June 2026
Certification of Internship Completion
This letter certifies that Ms. Dwi Puspita successfully completed her internship in the Administrative Department of PT. AdminPro Indonesia from May 2026 to June 2026. She assisted in office management, document preparation, and administrative support tasks.
For further inquiries, please contact us at +62 21 2345 6789.
Yours sincerely,
Ms. Anisa Wahyuni
Administrative Manager
Conclusion
These 16 internship letters exemplify the professional standards and essential elements required for job experience validation in Indonesia. Each letter is tailored to specific industries and roles, ensuring clarity, authenticity, and adherence to formal communication standards. Whether for engineering, marketing, HR, or other fields, these templates provide a comprehensive guide for crafting internship validation letters in 2026.