STG Partners

Gokce Guler Sirin

Gökçe Güler Şirin is a senior legal and compliance advisor with over 25 years of leadership experience across private practice and multinational corporate environments. She is widely recognized for her ability to design and implement enterprise-wide legal and compliance strategies that drive sustainable growth, strengthen governance, and mitigate complex regulatory risks. With a proven track record in antitrust, telecom regulation, fintech and electronic money services, commercial contracts, and corporate transactions, as well as contract lifecycle management, Gökçe has led high-stakes negotiations, managed cross-border legal mandates, and played a key role in structuring strategic alliances and joint ventures. Gökçe brings a unique blend of legal expertise and business strategy, having successfully led the development and implementation of complex compliance architectures, high-impact special projects, and cross-industry collaborations across telecommunications, technology, and regulated markets. Her value proposition lies in her ability to design and execute compliance and legal frameworks aligned with long-term corporate strategy, integrate legal governance into transformational business initiatives (cross-border transactions, strategic alliances, M&As), enhance ethical conduct and corporate integrity through systems-thinking and leadership alignment and serve as a strategic consultant on stakeholder risks and regulatory shifts. She is a trusted voice at the intersection of law and business, known for aligning legal advisory with operational strategy, corporate goals and vision to drive strategy, manage risk, and build lasting stakeholder trust. CORE AREAS OF EXPERTISE Antitrust & Competition Law: Advises clients on merger control, cartel investigations, vertical restraints, and abuse of dominance cases, with a track record before Turkish and international competition authorities. Provides strategic counsel on competition and antitrust compliance, develop compliance and competitor monitoring programs. Telecom Regulation: Offers in-depth legal insight into licensing, spectrum use, market entry, compliance, and regulatory engagement for operators and technology firms. Fintech: Advises on legal and regulatory frameworks for electronic money institutions, digital wallets, mobile payment systems and embedded finance models. Provides strategic counsel on licensing, operational compliance, AML & ABM obligations, and consumer protection across digital finance ecosystems. Supports the design, governance, and compliance architecture of financial technology products in alignment with evolving regulatory expectations and innovation-driven business goals. Contract Negotiation & Transaction Management: Leads high-value negotiations, particularly in sectors such as telecommunications, energy, and infrastructure; ensures strategic alignment and contractual clarity. Corporate & Commercial Transactions: Advises on cross-border joint ventures, asset transfers, procurement models, and public-private structuring, particularly in regulated industries. Regulatory Compliance & Risk Management: Designs and implements legal risk frameworks, compliance programs, and internal policy architecture across corporate groups. Frequently works with stakeholders across legal, risk, and product teams to ensure scalable, future-proof compliance in a rapidly changing regulatory landscape. Public Procurement & Market Conduct: Represents clients in relation to tender disputes, concession models, and market abuse investigations tied to dominant position or collusive practices. Ethics & Compliance: Develops and implements end-to-end compliance architectures covering both global policy and local regulatory frameworks. Advises to clients on anti-bribery & corruption (ABMC), anti-money laundering (AML), and economic sanctions compliance, aligning corporate conduct with international regulatory expectations. Oversees internal investigations, monitors integrity risks, and leads the design of whistleblowing, reporting, and monitoring systems to ensure corporate accountability and ethical governance

Burcu Güray

Burcu Güray is a skilled legal advisor with extensive experience in corporate and commercial law, regulatory compliance, and capital markets advisory. She regularly supports international and domestic clients across a spectrum of industries, helping avigate regulatory intersections and mitigate legal risk in inh stakes commercia ulations into strategic guidance for business leaders and legal teams, with a strong focus on governance, financial services, and data-driven sectors. She is recognized as one of the rising voices in the Turkish compliance community, known for her sharp regulatory insight and her ability to bridge legal risk with practical operational guidance across emerging sectors

Z.Ertunc Sirin MA

Dr. Z. Ertunc Sirin is a distinguished legal advisor and academic, with over 25 years of experience in tax law, customs law, administrative and procurement law, and regulatory compliance. He has represented domestic and international clients across contentious and non-contentious matters, particularly in international arbitration and transnational litigation. His practice bridges academic rigor with strategic advisory, shaped by nearly three decades of teaching, publishing, and consulting. Formerly co-founded and led a major Turkish law firm's tax, customs, and administrative law practice. Advised on regulatory and compliance matters, represented clients in disputes, and acted as legal strategist in cross-border regulatory cases. Supports clients in high-stakes arbitration and litigation cases, including construction and infrastructure projects, joint venture disputes, bilateral investment treaty claims, and commercial conflicts under FIDIC forms. Appears before national courts and arbitral tribunals, including ICC, ISTAC, and ad hoc tribunals.

Burcu Tuzcu Ersin

Burcu is a trusted advisor to Turkish conglomerates, multinational corporations and international investors on high‑stakes compliance, internal investigations, regulatory matters and strategic M&A and transactions. She combines the breadth of a corporate and M&A lawyer with the depth of a financial crime, technology and compliance specialist, built over years of advising on complex cross‑border business and capital markets matters. Burcu is widely recognised for anticipating strategic and enforcement risk early and for designing pragmatic mitigation strategies that integrate seamlessly with business objectives, deal dynamics and crisis situations. Her practice spans anti‑corruption and bribery, fraud and corporate crime, AML/CFT, sanctions and export controls, as well as corporate governance, data privacy and cybersecurity, regulatory compliance, employee misconduct and board‑level investigations. She regularly leads deal‑driven risk assessments, due diligence and remediation planning on domestic and cross‑border M&A, joint ventures and strategic investments, particularly in regulated and technology‑driven sectors. Burcu is consistently ranked by leading directories, including recognition by The Legal 500 as a Leading Individual in Compliance, Corporate/Commercial and M&A and IT & Telecoms in Türkiye, and by Lexology for investigations and data work