How to Apply to S-Oil (Aramco Korea)

9 min read Last updated April 20, 2026 1 open positions
Blake Crosley
Blake Crosley Researched using publicly available information, hiring data, and ATS analysis.

Key Takeaways

  • S-Oil is a Korean operating company with Saudi Aramco majority ownership (~63%); apply expecting Korean conglomerate culture day-to-day, with Aramco influence on strategy, capital, and select international roles.
  • The annual 신입공채 cycle is the primary entry point for new graduates and is highly competitive; experienced-hire postings appear year-round and weight track record over academic pedigree.
  • Korean language fluency is non-negotiable for HQ and Onsan roles; English proficiency is a meaningful differentiator and a hard requirement for Aramco-coordination tracks.
  • The HMAT-style aptitude test is a real elimination gate; prepare with commercial study materials and timed practice rather than treating it as a formality.
  • The Shaheen Project ($7B petrochemical expansion completing 2026) is the dominant near-term hiring driver; backgrounds in steam cracking, polymers, large-capex EPC delivery, and CSU are particularly in demand.
  • Apply only through the official S-Oil portal (recruit.s-oil.com); third-party listings are unofficial and may be outdated or fraudulent.
  • Treat the 자기소개서 as the application's center of gravity, not a formality; tailored, evidence-rich essays meaningfully change document review outcomes.

About S-Oil (Aramco Korea)

S-Oil Corporation (에쓰오일, KOSPI: 010950) is South Korea's third-largest oil refiner, headquartered in Mapo-gu, Seoul, with its operational heart at the Onsan Refinery in Ulsan, the second-largest single-site refining and petrochemical complex in Asia. Founded in 1976 as Korea-Iran Petroleum Corporation, the company has been majority-owned by Saudi Aramco since 2015, with Aramco's Aramco Overseas Holdings B.V. holding approximately 63.4% of outstanding shares. This dual identity is central to understanding the company: day-to-day operations remain unmistakably Korean, with Korean as the working language, Korean management hierarchies, and the traditional 신입공채 (sin-ip gong-chae) annual recruiting cycle, but strategic capital allocation, long-term feedstock planning, and major project decisions flow through Dhahran. The Onsan Refinery processes approximately 669,000 barrels per day of crude oil, predominantly sourced from Saudi Aramco under long-term term contracts, and integrates downstream petrochemical production including paraxylene, benzene, propylene oxide, and lubricant base oils. The company operates a nationwide retail network of more than 2,000 service stations under the S-OIL and Guard brands, competing directly with SK Innovation, GS Caltex, and HD Hyundai Oilbank for both wholesale and retail market share. The defining strategic initiative of the current decade is the Shaheen Project, a roughly 9 trillion won (approximately $7 billion USD) petrochemical expansion at the Onsan site, expected to mechanically complete in 2026 and to make S-Oil one of Asia's most integrated refining-to-chemicals operators. Shaheen, named after the Arabic word for falcon, will produce ethylene, propylene, butadiene, and downstream polymers using a steam-cracker fed partly by refinery off-gases, a configuration that monetizes streams previously sold as low-value fuel. Workforce size is approximately 3,000 employees, with the largest single concentration in Ulsan operations, a smaller commercial and corporate population in Seoul, and growing technical demand tied to Shaheen commissioning, digitalization of refining operations, and ESG and decarbonization mandates inherited from both Aramco group commitments and Korean Emissions Trading Scheme obligations. Compensation is competitive within the Korean refining peer set, with strong base salary, performance-tied bonus, profit-sharing in high-margin years, and a stable career arc that emphasizes long-tenure development over rapid lateral mobility.

Application Process

  1. 1
    Monitor the official S-Oil recruiting portal (recruit

    Monitor the official S-Oil recruiting portal (recruit.s-oil.com) and the corporate careers page at s-oil.com for the annual 신입공채 (new graduate open recruitment) cycle, which typically opens once or twice per year, most commonly in spring (March-April) and autumn (September-October), with experienced-hire (경력) postings appearing on a rolling basis throughout the year.

  2. 2
    Create an account on the S-Oil custom recruiting portal and complete the Korean-

    Create an account on the S-Oil custom recruiting portal and complete the Korean-language application (입사지원서) including personal information, education history, certifications (자격증), language scores (TOEIC, OPIc, TOEIC Speaking), and the structured 자기소개서 essay questions, which usually include motivation, growth experience, collaboration, and a question specific to S-Oil's vision or the Shaheen Project.

  3. 3
    Submit application before the published deadline; late submissions are not accep

    Submit application before the published deadline; late submissions are not accepted, and the system typically closes at 17:00 or 18:00 KST on the closing date. Document review (서류전형) is the first elimination gate and is heavily weighted on academic record, English proficiency, relevant certifications, and essay quality.

  4. 4
    If selected, sit for the HMAT-style aptitude test (S-Oil's variant of the standa

    If selected, sit for the HMAT-style aptitude test (S-Oil's variant of the standard Korean conglomerate 인적성검사), an offline or online proctored exam covering language reasoning, numerical reasoning, spatial and figural reasoning, situational judgment, and a personality inventory; for engineering tracks, expect a technical knowledge component covering chemical engineering fundamentals, unit operations, or relevant engineering domain.

  5. 5
    Pass the first-round interview (실무진 면접), conducted in Korean by working-level ma

    Pass the first-round interview (실무진 면접), conducted in Korean by working-level managers and senior engineers, focused on technical depth for engineering roles, business case discussion for commercial roles, and behavioral fit. For some tracks, expect a presentation interview (PT 면접) requiring a 10-15 minute prepared presentation on a given topic followed by Q&A.

  6. 6
    Pass the executive or final interview (임원 면접), conducted by senior leadership an

    Pass the executive or final interview (임원 면접), conducted by senior leadership and in some cases including an Aramco-affiliated executive; this round emphasizes long-term career intent, values alignment, and ability to operate in a Korean-Saudi joint cultural environment. English proficiency is verified here for roles involving Aramco coordination.

  7. 7
    Complete the health examination (건강검진) at a designated hospital and submit final

    Complete the health examination (건강검진) at a designated hospital and submit final documentation including academic transcripts, graduation certificate, certificate of military service completion or exemption (남성 지원자), and language score reports.

  8. 8
    Receive the formal offer letter (합격 통지) and begin onboarding, which for new grad

    Receive the formal offer letter (합격 통지) and begin onboarding, which for new graduates includes a multi-week residential orientation in Ulsan, plant safety induction, and rotation introductions before final placement; experienced hires generally bypass the residential orientation and join their assigned team after a shorter compliance and safety induction.

Resume Tips for S-Oil (Aramco Korea)

recommended

Submit a Korean-language 입사지원서 through the official portal as the primary applic

Submit a Korean-language 입사지원서 through the official portal as the primary application; an English CV is acceptable as a supplementary document only for roles explicitly requiring English (Aramco coordination, international trading, technical licensor liaison) and is not a substitute for the Korean form.

recommended

Lead with quantified academic credentials: university name, major, GPA on the Ko

Lead with quantified academic credentials: university name, major, GPA on the Korean 4.5 scale (with conversion noted if from overseas), and any honors. S-Oil, like most Korean conglomerate-tier employers, screens heavily on academic pedigree, particularly for engineering roles from chemical, mechanical, electrical, industrial, and environmental engineering programs.

recommended

List language scores prominently with test date and validity: TOEIC 850+ is comp

List language scores prominently with test date and validity: TOEIC 850+ is competitive for general roles, 900+ for international-facing roles, and OPIc IH or higher or TOEIC Speaking Level 7+ is increasingly expected. Note any Arabic or Chinese ability separately; Arabic is a genuine differentiator given Aramco linkage.

recommended

Highlight industry-relevant certifications: 위험물산업기사 or 위험물기능사 (Hazardous Materia

Highlight industry-relevant certifications: 위험물산업기사 or 위험물기능사 (Hazardous Materials), 화공기사 (Chemical Engineering), 전기기사 (Electrical), 산업안전기사 (Industrial Safety), 가스기사 (Gas), and PE licenses for senior engineering roles. For commercial tracks, CFA, CPA, or 한국공인회계사 carry weight.

recommended

For experienced hires, structure work history around plant or project context (r

For experienced hires, structure work history around plant or project context (refinery unit, capacity, throughput), responsibilities (process engineering, turnaround planning, optimization, HSE), and outcomes with hard numbers (yield uplift in percentage points, energy intensity reduction, incident-free hours, capital project value).

recommended

Address the Shaheen Project directly if your background touches steam cracking,

Address the Shaheen Project directly if your background touches steam cracking, polymer production, large-capex EPC project delivery, commissioning and start-up (CSU), or process licensor coordination (Lummus, Linde, UOP, Axens). This is where S-Oil is actively expanding headcount.

recommended

Tailor the 자기소개서 essays to the specific question; do not paste generic templates

Tailor the 자기소개서 essays to the specific question; do not paste generic templates. Korean recruiters and AI screening tools used by major chaebol-tier employers detect and downgrade boilerplate. Reference S-Oil's stated values (안전, 신뢰, 도전, 협력) and concrete recent initiatives where genuinely relevant.

recommended

Include military service status (병역) for male applicants, as this is a standard

Include military service status (병역) for male applicants, as this is a standard data field and unexplained gaps are a screening flag. Equivalent service (전문연구요원, 산업기능요원) should be noted with employer and dates.

ATS System: S-Oil Custom Korean Recruiting Portal (recruit.s-oil.com)

S-Oil operates its own bespoke recruiting platform rather than using a third-party SaaS ATS such as Workday, SAP SuccessFactors, or Greenhouse. The portal is Korean-first with limited English support, requires account registration before any application can be submitted, and stores candidate profiles for re-use across recruiting cycles. Document review screening combines structured field matching (degree, GPA, language scores, certifications) with manual review of the 자기소개서 essays by HR and hiring teams; for high-volume gong-chae cycles, an initial automated filter on hard credentials precedes essay review.

  • Register on the portal well before the cycle opens and complete the standing profile carefully; reuse across postings saves time but errors propagate, so audit before each new application.
  • Korean fonts and formatting render best; pasting from Word can break formatting and character counts in the essay fields, so compose 자기소개서 directly in the portal or in plain text and paste in.
  • Each essay question has a strict character limit (글자수 제한) typically between 500 and 1,500 characters including spaces; the system blocks submission over the limit, so write to the limit but do not exceed.
  • Upload supporting documents (transcripts, certificates, language score PDFs) only when explicitly requested in the posting; unsolicited attachments are not reviewed.
  • Save drafts frequently; the portal session can time out and unsaved work is lost. Final submission is irrevocable, and re-applications to the same posting in the same cycle are not permitted.

Interview Culture

S-Oil interviews follow the Korean conglomerate convention of multiple rounds with rising seniority, conducted primarily in Korean, with formal address (존댓말), business attire (suit and tie or equivalent), and structured rather than conversational pacing. The first round (실무진 면접) is held by working-level team leads and senior engineers and is the most technically substantive: expect deep questioning on coursework, thesis or project work, internship experience, and for engineering tracks specific process knowledge such as fluid catalytic cracking, hydrocracking, reformer operation, distillation column troubleshooting, or ethylene cracker fundamentals depending on the role. Some tracks include a presentation interview (PT 면접) where candidates receive a topic in advance or on the day, prepare a slide deck, and present for 10-15 minutes followed by panel Q&A; topics often combine industry awareness with analytical reasoning, such as evaluating a refining margin scenario or proposing a decarbonization initiative. The final round (임원 면접) shifts emphasis from technical depth to values, long-term commitment, leadership trajectory, and cultural fit; the panel typically includes a vice-president-level executive and an HR director, and for roles with significant Aramco interface a senior expatriate or Aramco-affiliated executive may join, in which case portions of the interview are conducted in English. Cultural expectations include arriving 30 minutes early, addressing interviewers as 면접관님 or by title (이사님, 부장님), maintaining respectful posture, declining to interrupt, and answering with structured 결론-근거-사례 (conclusion-evidence-example) responses rather than rambling. Honest acknowledgement of weakness paired with concrete improvement effort is preferred to overconfidence. For experienced hires, the process is compressed to two rounds in most cases and emphasizes track record and immediate contribution capability over potential.

What S-Oil (Aramco Korea) Looks For

  • Strong academic foundation from a recognized Korean or international university, particularly in chemical, mechanical, electrical, industrial, or environmental engineering for technical tracks, and business, economics, statistics, or industrial engineering for commercial and planning tracks.
  • Demonstrated Korean language fluency at native or near-native business level for HQ and Onsan roles; written, spoken, and ability to handle formal corporate Korean (존댓말, 보고서 작성).
  • Functional English proficiency sufficient for Aramco coordination, technical document review, and licensor communication; verifiable through TOEIC 850+, OPIc IH+, or equivalent, with higher bars for international-facing teams.
  • Industry-relevant certifications and licenses appropriate to the role family (hazardous materials, chemical engineering, electrical, safety, gas), and willingness to pursue additional licensure as part of career development.
  • Long-term commitment orientation; S-Oil, like most Korean conglomerates, invests heavily in onboarding and rotation development and screens against candidates perceived as likely to depart within two to three years.
  • Demonstrable interest in and understanding of the energy and petrochemical industry, including current dynamics such as the energy transition, refining margin cycles, the Shaheen Project, and Korean energy security policy.
  • Cross-cultural adaptability for roles touching Saudi Aramco coordination, including comfort working across time zones, with diverse communication styles, and within an environment where Korean operating norms and Saudi strategic norms coexist.
  • Safety-first mindset and respect for operational discipline; S-Oil places heavy weight on HSE culture, and any history of cavalier attitude toward safety or compliance is a disqualifier for plant-facing roles.

Frequently Asked Questions

Does Saudi Aramco run S-Oil day-to-day, or is it really still a Korean company?
Operationally, S-Oil is a Korean company. Korean is the working language at headquarters and at the Onsan Refinery, the management hierarchy follows Korean conglomerate conventions, and HR processes including the 신입공채 cycle, HMAT-style testing, and 임원 면접 final interviews are unchanged. Aramco's roughly 63% ownership translates into board-level influence, strategic capital allocation (most visibly the Shaheen Project), long-term crude supply arrangements, and select expatriate executives in strategic roles, but most employees never interact with Aramco staff directly.
Do I need to speak Arabic to work at S-Oil?
No. Korean is required for nearly all roles, and English is the preferred second language for international and Aramco-coordination work. Arabic is a genuine differentiator for a small number of roles touching directly with Aramco corporate or Saudi-based projects, but it is not a general requirement and the absence of Arabic does not disqualify candidates from any standard track.
What is the HMAT-style aptitude test, and how should I prepare?
The HMAT format refers to a Hyundai-Motor-style aptitude testing convention that several Korean conglomerates have adopted in variant forms; S-Oil's aptitude test follows similar conventions, covering language reasoning, numerical reasoning, figural and spatial reasoning, situational judgment, and a personality inventory. Preparation should include commercially available HMAT or 인적성검사 study books, timed practice under the actual time constraints, and exposure to the question types so that pacing is automatic on test day.
Is S-Oil a good place for foreign engineers without Korean fluency?
Generally no for permanent roles based in Korea. Foreign engineers without Korean fluency may find opportunities in narrow niches such as licensor liaison or specific technical roles tied to Shaheen Project EPC contractors, but S-Oil is not structured to absorb non-Korean-speaking permanent hires at scale. Foreign nationals with strong Korean language ability and Korean university degrees are evaluated on the same basis as Korean candidates.
How does S-Oil compare to SK Innovation, GS Caltex, and HD Hyundai Oilbank as an employer?
All four are large Korean refiners offering competitive compensation, strong stability, and well-developed training. S-Oil is the smallest of the four by employee count, has the most concentrated single-site footprint (Onsan), and is the most distinctive in ownership structure due to Aramco majority control. SK Innovation has the broadest portfolio including batteries; GS Caltex is a Chevron-GS joint venture with strong refining operations; HD Hyundai Oilbank is part of HD Hyundai group. Choice often comes down to fit with specific role family and personal preference on group identity.
What is the Shaheen Project, and how does it affect hiring?
The Shaheen Project is a roughly $7 billion petrochemical expansion at Onsan, including a steam cracker, polyolefin units, and supporting utilities, expected to mechanically complete in 2026. It has driven sustained hiring in process engineering, mechanical and rotating equipment, instrumentation and controls, project management, commissioning and start-up, HSE, and operations. Backgrounds in olefins, polymers, large-capex EPC delivery, and CSU are particularly relevant for the project window and the post-completion operations buildout.
Can I apply to multiple positions in the same gong-chae cycle?
Generally only one position per cycle is permitted, and submitting duplicates can result in disqualification. Choose the role that best matches your background and read the posting carefully; track changes between cycles can be significant. Re-application in the next cycle is permitted if unsuccessful.
What is compensation like at S-Oil?
S-Oil compensation is competitive within the Korean refining sector, with a base salary structure typical of large Korean conglomerates, performance bonus tied to company and individual performance, profit-sharing in strong years (S-Oil has historically distributed substantial PS in high-margin years), and a comprehensive benefits package including housing support for Ulsan-based staff, subsidized meals, family healthcare, and tuition assistance. Specific figures should be discussed during the offer stage; published averages on Korean career sites such as JobKorea and Saramin provide directional reference.
Will I be required to relocate to Ulsan?
Most engineering, operations, HSE, and technical roles are based at the Onsan Refinery in Ulsan, with company-supported relocation and dormitory or housing options for younger employees. Commercial, finance, planning, IT, and corporate functions are largely Seoul-based at the Mapo headquarters. Cross-rotation between Seoul and Ulsan is part of standard career development for general management track employees.
Where are the official application channels, and how do I avoid fraudulent listings?
The only authoritative channels are the S-Oil recruiting portal at recruit.s-oil.com and the corporate website at s-oil.com. Reputable Korean job aggregators (JobKorea, Saramin, Wanted) may republish official postings with backlinks, but applications should be submitted through the S-Oil portal rather than via aggregator-hosted forms. Listings on social media or messaging apps that request fees, personal financial information, or off-platform interviews should be treated as fraudulent.

Open Positions

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Related Resources

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Sources

  1. S-Oil Corporation Official Website (Company Overview, Investor Relations, Sustainability) —
  2. S-Oil Recruiting Portal (Official Careers Site) —
  3. S-Oil Corporation Annual Report and Sustainability Report (Investor Relations Disclosures) —
  4. Saudi Aramco Investor Relations (Subsidiary and Equity Holdings Disclosures) —
  5. Korea Exchange (KRX) Listed Company Disclosure for S-Oil (KOSPI 010950) —
  6. Shaheen Project Coverage and EPC Disclosures (Industry Press) —
  7. JobKorea S-Oil Company Profile and Salary Data —
  8. Saramin S-Oil Company Profile and Recruiting Listings —
  9. Korea Petroleum Association (KPA) Industry Statistics (Refining Capacity, Market Share) —
  10. Financial Supervisory Service DART (S-Oil Corporate Disclosures) —