How to Apply to Celltrion

11 min read Last updated April 20, 2026 17 open positions
Blake Crosley
Blake Crosley Researched using publicly available information, hiring data, and ATS analysis.

Key Takeaways

  • Celltrion is the world's pioneer in monoclonal antibody biosimilars, having launched the first mAb biosimilar (Remsima) approved by the EMA in 2013. The company now has 11 commercial biosimilar products with plans to reach 22 by 2030 and 41 by 2038, making it one of the most important employers in the global biosimilar sector.
  • The company uses a proprietary online recruitment portal at recruit.celltrion.com rather than a widely recognized third-party ATS such as Workday or Greenhouse. All applications must be submitted digitally through this portal, and results are posted there as well. For U.S. positions, direct email to [email protected] is an alternative pathway.
  • Celltrion's six-stage hiring process includes online application, document screening, online personality test, interview (technical and personality combined, potentially including an English interview), physical check-up at a designated hospital, and final acceptance. The average process takes about 7 days but can extend to 30 days for specialized roles.
  • English proficiency is critical and formally assessed. Many positions require a separate English interview segment. Non-Korean speakers should highlight English credentials prominently, while Korean language ability is beneficial for headquarters-based roles in Incheon.
  • Celltrion reported record revenue of 4.16 trillion won in 2025 and is targeting 7-8 trillion won in 2026 with massive expansion plans including a new CDMO business (Celltrion BioSolutions), additional manufacturing plants in Songdo, and entry into innovative drug development with bispecific antibodies, ADCs, and mRNA therapeutics.
  • The company culture blends Korean corporate hierarchy with the technical demands of global biopharmaceutical operations. Glassdoor reviews (3.2/5 overall, 131 reviews) highlight strong compensation, high job security, and strong career opportunities (4.0/5) alongside high work intensity and traditional management structures that are evolving as the company matures.
  • Candidates with biosimilar-specific experience have a distinct advantage. Familiarity with reference biologics (Remicade, Rituxan, Herceptin, Avastin), biosimilar regulatory pathways, analytical similarity studies, or commercial biosimilar market dynamics demonstrates directly applicable expertise that Celltrion values.
  • Celltrion's three core values — Creativity, Principle, and Challenge — are embedded throughout the corporate culture and may surface in interview questions. Prepare examples that demonstrate innovative thinking, ethical commitment, and willingness to tackle difficult problems.
  • The company is in aggressive global expansion mode with operations across Korea, the U.S., Europe, Japan, and Latin America, plus partnerships reaching 110 countries. This growth trajectory means sustained hiring demand across R&D, manufacturing, quality, regulatory, commercial, and corporate functions for the foreseeable future.

About Celltrion

Celltrion, Inc. is a pioneering South Korean biopharmaceutical company headquartered in Yeonsu-gu, Incheon, that has established itself as one of the world's foremost developers and manufacturers of biosimilar monoclonal antibodies. Founded in 2002 by Seo Jung-jin, who serves as Chairman and is recognized as one of South Korea's wealthiest individuals, Celltrion achieved a historic milestone in 2013 when its infliximab biosimilar Remsima became the world's first monoclonal antibody biosimilar approved by the European Medicines Agency (EMA). Today the company's commercial portfolio spans 11 biosimilar products across immunology, oncology, and other therapeutic areas. Immunology products include Remsima (infliximab, marketed as Inflectra in the United States), Remsima SC (subcutaneous infliximab), Yuflyma (adalimumab), and SteQeyma (ustekinumab). Oncology products include Truxima (rituximab), Herzuma (trastuzumab), and Vegzelma (bevacizumab). Additional products include Omlyclo, Eydenzelt, Stoboclo, and Osenvelt. In April 2026, Truxima became the most prescribed rituximab drug in the United States, marking the first time a Korean biosimilar achieved the top prescription position in the American market. Celltrion operates state-of-the-art production facilities across three manufacturing plants in Songdo, Incheon, with a combined bioreactor capacity of approximately 250,000 liters. The company is aggressively expanding: it has invested over $800 million in a new drug product manufacturing plant in Songdo (expected to begin commercial production in 2027), launched Celltrion BioSolutions Co. in December 2024 to enter the contract development and manufacturing organization (CDMO) market, and is investing $453 million in a third manufacturing site and R&D center. Celltrion reported record annual revenue of 4.16 trillion Korean won (approximately $3 billion) in 2025, representing 17% year-over-year growth and the first time the company exceeded 4 trillion won in sales. The company targets 7-8 trillion won by 2026 and 10 trillion won by 2027. Celltrion's ambitious pipeline aims to expand from 11 to 22 biosimilar products by 2030 and 41 by 2038, while also advancing innovative drug programs including four bispecific antibody candidates, proprietary mRNA vaccine platform technology, microbiome therapeutics, and 13 planned antibody-drug conjugates (ADCs). The Celltrion group, including subsidiaries Celltrion Healthcare (global marketing and distribution) and Celltrion Pharm (pharmaceutical manufacturing), employs approximately 7,000 people across operations in South Korea, the United States, Europe, Japan, Latin America, and other regions, with products reaching roughly 110 countries through more than 30 global partners.

Application Process

  1. 1
    Browse open positions on Celltrion's dedicated recruitment portal at recruit

    Browse open positions on Celltrion's dedicated recruitment portal at recruit.celltrion.com, or check subsidiary career pages including celltrionusa.com for U.S.-based roles and celltrionph.com for Celltrion Pharm positions. Positions may also be posted on global job boards such as LinkedIn, Indeed, and Glassdoor. For U.S. roles where no active listings appear, email your resume directly to [email protected] with a cover letter expressing your interest.

  2. 2
    Submit your application online through Celltrion's portal during an active recru

    Submit your application online through Celltrion's portal during an active recruitment period. All applications must be submitted digitally — Celltrion does not accept paper or walk-in applications. Complete the required fields carefully, as the document screening stage evaluates your submitted materials against the position's minimum qualifications.

  3. 3
    Wait for document screening results

    Wait for document screening results. Celltrion's recruitment team individually notifies successful applicants who pass the resume and credential review. Only candidates who clear this stage are contacted; the company does not typically notify unsuccessful applicants at this phase. Response times vary by role, with some positions completing screening within days and others taking up to three weeks.

  4. 4
    Complete the online personality test if selected

    Complete the online personality test if selected. After passing document screening, Celltrion administers a personality assessment conducted online. This psychometric evaluation helps the company assess cultural fit and behavioral tendencies alongside your technical qualifications. Approach it honestly rather than attempting to game the results.

  5. 5
    Participate in the interview stage, which combines technical competency assessme

    Participate in the interview stage, which combines technical competency assessment and personality evaluation. Interviews are conducted by officers and hiring managers who evaluate both your domain expertise and your personal qualities. Depending on the position, a separate English interview may be required to assess your communication skills in English. Some candidates report group interview formats alongside individual conversations with hiring managers.

  6. 6
    Complete a physical check-up at a hospital designated by Celltrion

    Complete a physical check-up at a hospital designated by Celltrion. This medical examination is limited to candidates who have passed the interview stage and is a standard requirement for pharmaceutical and manufacturing companies in South Korea. The examination ensures fitness for work in environments that may include cleanroom or laboratory settings.

  7. 7
    Receive your final acceptance decision, which is posted on the Celltrion recruit

    Receive your final acceptance decision, which is posted on the Celltrion recruitment portal. Successful candidates are contacted with offer details including compensation, start date, and onboarding information. For hiring inquiries at any stage, contact [email protected] or call +82-32-850-5121.

Resume Tips for Celltrion

recommended

Lead with biosimilar, biologics, or pharmaceutical manufacturing experience

Lead with biosimilar, biologics, or pharmaceutical manufacturing experience. Celltrion is the world's pioneer in monoclonal antibody biosimilars, and demonstrating relevant expertise in bioprocess development, analytical characterization, regulatory submissions for biosimilar products, or clinical trial design for biosimilar comparability studies signals immediate alignment with their core business.

recommended

Quantify your impact with specific metrics relevant to pharmaceutical operations

Quantify your impact with specific metrics relevant to pharmaceutical operations. Replace vague statements like 'contributed to process improvement' with concrete results such as 'reduced batch turnaround time by 18% across 10,000L bioreactor campaigns' or 'led analytical method transfer for 3 biosimilar products across 2 regulatory jurisdictions.' Celltrion values measurable contributions to manufacturing efficiency, quality compliance, and commercial outcomes.

recommended

Highlight English language proficiency prominently

Highlight English language proficiency prominently. English communication ability is crucial at Celltrion, with separate English-language interviews required for many positions. Include TOEIC, IELTS, OPIc, or equivalent scores on your resume. If English is your native language, note this clearly. For positions at Celltrion's Korean headquarters, any Korean language ability is also worth listing.

recommended

Emphasize regulatory and quality assurance experience across multiple markets

Emphasize regulatory and quality assurance experience across multiple markets. Celltrion's products are approved and marketed in over 110 countries, requiring compliance with regulations from the MFDS (Korea), FDA (United States), EMA (Europe), PMDA (Japan), and many other agencies. Experience with GMP compliance, regulatory filing preparation, pharmacovigilance, deviation investigations, or audit readiness strengthens your candidacy significantly.

recommended

Include experience with monoclonal antibody development and manufacturing techno

Include experience with monoclonal antibody development and manufacturing technologies. Celltrion's facilities specialize in mAb production at scale. Relevant technical skills include mammalian cell culture (CHO cell lines), upstream and downstream bioprocessing, chromatography and purification, formulation development, fill/finish operations, and analytical methods such as SEC-HPLC, CE-SDS, and biological activity assays.

recommended

Demonstrate global or cross-cultural experience on your resume

Demonstrate global or cross-cultural experience on your resume. Celltrion operates across Korea, the United States, Europe, Latin America, and Asia-Pacific with more than 30 global distribution partners. Experience working across cultures, managing international regulatory submissions, or collaborating with cross-functional global teams positions you as a candidate who can navigate Celltrion's multinational operations.

recommended

Use a clean, ATS-compatible resume format with standard section headers

Use a clean, ATS-compatible resume format with standard section headers. Celltrion's recruitment portal processes applications digitally, so ensure your resume uses clear section headers (Experience, Education, Skills, Certifications), avoids complex formatting or graphics that could confuse parsing systems, and presents information in reverse-chronological order. A one- to two-page format is appropriate for most positions.

recommended

Reference Celltrion's specific products and pipeline where relevant

Reference Celltrion's specific products and pipeline where relevant. Mentioning products like Remsima, Truxima, Herzuma, or Vegzelma by name when discussing related experience demonstrates genuine familiarity with the company's portfolio. If your background includes work on competing or reference biologics (Remicade, Rituxan, Herceptin, Avastin), highlight this directly as it shows domain-relevant expertise.

ATS System: Proprietary (recruit.celltrion.com)

Celltrion operates a custom-built recruitment portal at recruit.celltrion.com for its main entity, with separate career pages for Celltrion USA (celltrionusa.com) and Celltrion Pharm (celltrionph.com). The system handles the full application lifecycle including submission, document screening notifications, and result posting. It is not based on a widely recognized third-party ATS platform. For U.S.-based roles, direct email submission to [email protected] is also accepted.

  • Submit applications exclusively through recruit.celltrion.com for Korean headquarters positions — no paper or walk-in applications accepted
  • Use a clean, simply formatted resume without complex graphics or tables that might confuse the proprietary parsing system
  • Include industry-standard biopharmaceutical terminology (biosimilar, monoclonal antibody, cGMP, ICH, pharmacovigilance) to ensure your qualifications are clearly recognized during document screening
  • Check the portal regularly for recruitment results, as Celltrion posts final acceptance decisions directly on the recruitment site
  • For U.S. positions, email [email protected] directly when no active listings appear on the portal

Complete Proprietary (recruit.celltrion.com) Resume Guide →

Interview Culture

Interviewing at Celltrion reflects the company's identity as a fast-growing Korean biopharmaceutical company where ambition, technical rigor, and cultural awareness all matter.

Based on Glassdoor data from 22 interview reviews, candidates rate the interview difficulty at 2.78 out of 5 — moderately challenging but not adversarial — and 50% of candidates describe their overall experience as positive. The average interview process takes approximately 7 days from initial screening to decision, though this varies significantly by role: some positions such as Accountant roles complete in as little as one day, while specialized roles like Global Regulatory Affairs can take up to 30 days. The interview structure typically begins with a quick HR screening call followed by a more substantive conversation with the hiring manager approximately one week later. For technical and scientific roles, expect detailed questioning about your domain expertise in biopharmaceutical development, manufacturing processes, quality systems, or regulatory affairs. Interviewers will assess your ability to discuss specific projects, methodologies, and outcomes rather than relying on abstract or theoretical answers. English proficiency is evaluated seriously, and depending on the position, a dedicated English-language interview segment may be conducted to assess your ability to communicate technical concepts clearly. Candidates should prepare for this regardless of whether the role description explicitly mentions it. Celltrion's interview culture carries the hallmarks of Korean corporate norms: formal business attire is expected, punctuality is essential, and demonstrating respect for organizational hierarchy signals cultural awareness. The company values what it describes as Creativity, Principle, and Challenge — three core values that may surface directly or indirectly in interview questions. Be prepared to discuss situations where you solved problems through innovative thinking, upheld professional principles under pressure, and embraced difficult challenges rather than avoiding them. Some candidates report group interview formats, which is common at larger Korean companies and is designed to observe how candidates interact with peers, communicate under observation, and handle shared problem-solving scenarios. Glassdoor reviews describe a mixed but evolving workplace culture with an overall rating of 3.2 out of 5 based on 131 reviews. Employees highlight strong compensation packages (among the top in Korea's biopharma sector), high job security, and meaningful career growth opportunities (rated 4.0 out of 5). However, some reviews note that the company retains elements of traditional Korean corporate culture including hierarchical management, high work intensity, and evolving internal systems as the company scales rapidly. During interviews, demonstrating awareness of Celltrion's position as a biosimilar pioneer — its historic achievement with Remsima, its expanding global commercial reach, and its ambitious pipeline targets — shows genuine interest that interviewers value. Coming prepared with knowledge about the biosimilar industry landscape, competitive dynamics, and Celltrion's strategic direction (CDMO expansion, innovative drug pipeline, global revenue targets) distinguishes strong candidates from those who have not done their research.

What Celltrion Looks For

  • Deep domain expertise in biopharmaceutical sciences, particularly in areas relevant to biosimilar development and manufacturing: bioprocess engineering, analytical science, formulation, quality control and assurance, regulatory affairs, pharmacovigilance, or clinical development for biological products.
  • Strong English communication skills validated through formal assessment or demonstrated professional experience. Celltrion conducts English interviews for many roles and requires employees to collaborate with global partners, regulatory agencies, and commercial teams across 110+ countries.
  • Alignment with Celltrion's three core values: Creativity (innovative problem-solving and thinking beyond conventional approaches), Principle (integrity, trust, and adherence to professional and ethical standards), and Challenge (willingness to pursue ambitious goals and continuously seek growth).
  • Global perspective and cross-cultural adaptability. Celltrion's operations span South Korea, the United States, Europe, Japan, and Latin America. Candidates who can navigate diverse professional environments, manage international stakeholder relationships, and thrive in a Korean-headquartered multinational organization are highly valued.
  • Demonstrated commitment to quality and regulatory compliance. The biopharmaceutical industry is heavily regulated, and Celltrion's biosimilar products must meet the highest standards of safety, efficacy, and manufacturing quality across multiple global regulatory jurisdictions. Experience with cGMP, ICH guidelines, or biosimilar-specific regulatory pathways is essential for scientific and manufacturing roles.
  • Entrepreneurial drive and comfort with rapid organizational change. Celltrion has grown from a startup in 2002 to a global biosimilar leader with record revenues in barely two decades. The company values employees who embrace its fast-paced growth trajectory, adapt to evolving processes, and contribute proactively rather than waiting for established systems to guide them.
  • Team-oriented professionals who respect hierarchical decision-making while contributing substantive expertise. Celltrion's organizational culture blends Korean corporate hierarchy with the collaborative demands of pharmaceutical development. Candidates who can work effectively within structured reporting lines while still offering technical leadership and independent judgment are preferred.

Frequently Asked Questions

What applicant tracking system (ATS) does Celltrion use?
Celltrion uses a proprietary recruitment portal at recruit.celltrion.com rather than a widely recognized third-party ATS like Workday, Greenhouse, or Lever. Applications are submitted exclusively through this online portal, and screening results are posted there as well. Because the system is custom-built, standard ATS keyword optimization is less predictable. Focus on using clear, industry-standard terminology for your skills and experience, maintain a clean and parseable resume format, and ensure your qualifications map directly to the job description's requirements.
Does Celltrion hire internationally and sponsor work visas?
Yes, Celltrion actively operates in multiple countries including South Korea, the United States, the United Kingdom, and across Europe, Japan, and Latin America. The company's U.S. subsidiary (Celltrion USA) and distribution arm (Celltrion Healthcare) maintain offices outside Korea. Visa sponsorship policies vary by subsidiary, role, and jurisdiction. For U.S.-based opportunities, contact [email protected] to inquire about visa sponsorship for specific positions. For Korean headquarters roles, the company recruits globally and accommodates international candidates.
What is the personality test in Celltrion's hiring process?
After passing the document screening stage, Celltrion administers an online personality test as the third step in its six-stage hiring process. This psychometric assessment evaluates behavioral tendencies, workplace preferences, and cultural compatibility. The test is conducted digitally before the interview stage. While Celltrion does not publicly disclose which specific assessment tool is used, personality tests at Korean pharmaceutical companies typically measure traits such as conscientiousness, teamwork orientation, stress management, and alignment with corporate values. Answer honestly rather than attempting to project an idealized profile, as inconsistencies may be flagged.
How difficult are Celltrion interviews and what questions should I expect?
Glassdoor data indicates Celltrion interviews have an average difficulty of 2.78 out of 5, meaning they are moderately challenging but generally approachable for well-prepared candidates. The interview combines technical competency assessment with personality evaluation. Technical questions focus on your domain expertise, specific project experience, and problem-solving abilities. For scientific and manufacturing roles, expect detailed questions about bioprocess development, quality systems, or regulatory procedures. A separate English interview may be conducted depending on the position. Behavioral questions often explore how you embody Celltrion's values of Creativity, Principle, and Challenge.
How long does the Celltrion hiring process take from application to offer?
Based on candidate-reported data, the Celltrion hiring process takes an average of approximately 7 days from initial application to final decision. However, this varies significantly by role: straightforward positions like Accountant may complete in as little as one day, while specialized roles such as Global Regulatory Affairs can take up to 30 days. Some candidates report approximately three weeks between document screening and the first interview. The six-stage process (application, document screening, personality test, interview, physical check-up, final acceptance) includes mandatory steps that add time beyond just the interview itself.
What is it like to work at Celltrion's Incheon headquarters?
Celltrion's headquarters and manufacturing campus is located in the Songdo International City area of Yeonsu-gu, Incheon, near Seoul. The campus houses three large-scale bioreactor plants with 250,000 liters of combined capacity. Employee reviews on Glassdoor give Celltrion a 3.2 out of 5 overall rating, with career opportunities rated highest at 4.0 out of 5 and compensation described as among the top in Korea's biopharma industry. The work environment is demanding, with high intensity common across roles, reflecting the company's ambitious growth targets. The company has established a Code of Ethics emphasizing fair and transparent culture, and is investing in new employee amenities as part of its campus expansion.
What is the difference between Celltrion, Celltrion Healthcare, and Celltrion Pharm?
The Celltrion group comprises three main entities. Celltrion, Inc. is the parent company focused on biosimilar and innovative drug research, development, and manufacturing, headquartered in Incheon. Celltrion Healthcare handles global marketing, distribution, and commercialization of Celltrion's products across approximately 110 countries with more than 30 global partners. Celltrion Pharm (formerly Celltrion Pharmaceutical) operates pharmaceutical manufacturing facilities, with its main campus in Cheongju, Chungcheongbuk-do. Each entity has its own career page and hiring process. When applying, ensure you are targeting the correct subsidiary based on your desired function and location.
Does Celltrion require Korean language skills for all positions?
Korean language skills are not universally required, but their importance depends on the role and location. For positions at the Incheon headquarters, Korean proficiency is highly beneficial for daily operations, internal communication, and cultural integration. For international offices in the U.S., Europe, or other regions, English is the primary working language. Celltrion explicitly values English communication ability across the organization and may conduct dedicated English interviews. If you do not speak Korean, focus your application on international or English-primary roles, and note any willingness to learn Korean as a signal of long-term commitment.
What career growth opportunities does Celltrion offer?
Glassdoor reviews rate career opportunities at Celltrion at 4.0 out of 5, the highest-rated category among employee reviews. The company's rapid growth — from a 2002 startup to a global biosimilar leader with record revenues exceeding 4 trillion won — creates organic advancement opportunities as new teams, products, and markets are established. Celltrion is currently expanding into CDMO services through Celltrion BioSolutions, building new manufacturing plants, advancing an innovative drug pipeline with bispecific antibodies and ADCs, and entering new therapeutic areas including asthma, ophthalmology, and metabolic bone diseases. This expansion trajectory means new leadership positions and specialized roles are continually being created.
What should I know about Korean corporate culture before interviewing at Celltrion?
Celltrion operates within Korean corporate norms that differ from Western workplace culture. Key aspects include hierarchical organizational structures with clear reporting lines, formal communication protocols (especially with senior leaders), emphasis on team harmony and collective achievement over individual recognition, and high expectations for work intensity and dedication. Some Glassdoor reviews describe the culture as that of a 'conventional Korean company' where adapting to Korean workplace style is important. Demonstrating respect for hierarchy, punctuality, formal professionalism, and group-oriented thinking during interviews signals cultural awareness. At the same time, Celltrion values innovation and entrepreneurial spirit, so balance deference with the ability to contribute substantive technical ideas.

Open Positions

Celltrion currently has 17 open positions.

Check Your Resume Before Applying → View 17 open positions at Celltrion

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