Sebastián Sosa

Senior Auditor with 6+ years of experience at Deloitte, specializing in financial audits under PCAOB standards, SOX compliance, and IFRS/Spanish GAAP. Proven experience leading audit engagements, performing internal control testing, and supporting multinational clients in complex regulatory environments. Strong analytical mindset with a focus on risk assessment and process improvement.

Audit Experienced Senior at Deloitte Madrid (2023-01 – Present)

Lead financial audits under PCAOB and Spanish GAAP standards with focus on regulatory compliance and SOX controls testing.

• Lead financial audits under PCAOB and Spanish GAAP (PGC), ensuring full regulatory compliance
• Execute SOX controls testing (design, implementation, and operating effectiveness)
• Played a key role in the first-time PCAOB audit implementation for HomeServe Spain (2023), supporting successful transition to US regulatory standards, with continued involvement in 2024–2025 audits
• Prepare and review financial statements and perform detailed financial analysis
• Coordinate audit processes with clients and cross-functional teams

Audit Senior at Deloitte (2020-01 – 2023-12)

Led audit engagements and supervised junior auditors with experience in PCAOB standards and SOX compliance testing.

• Led audit engagements under international and local standards
• Supervised and coached junior auditors, improving team performance
• Participated in PCAOB audit for John Deere (2022), performing SOX control testing (design, implementation, and operating effectiveness)
• Identified financial and operational risks and proposed improvements in internal controls

Audit Assistant at Deloitte (2018-01 – 2020-12)

Performed audit testing and supported financial statement preparation with focus on internal controls evaluation.

• Performed audit testing and supported financial statement preparation
• Evaluated internal controls and identified key risk areas
• Collaborated with multidisciplinary teams under tight deadlines

Bachelor's Degree in Accounting – Pontificia Universidad Católica Argentina