Client Background

A rapidly scaling FinTech company based in Singapore, offering digital financial services across the APAC region, engaged us to evaluate and strengthen the security of their external network, large-scale API ecosystem, and cloud infrastructure. With over 300 public-facing APIs supporting customer transactions and third-party integrations, maintaining strong security assurance was critical to both business continuity and regulatory compliance.

Challenge

The FinTech faced increased exposure due to its heavily API-driven architecture and cloud-native deployment model. They required a comprehensive black-box external network assessment to validate perimeter defenses, an extensive API security review covering hundreds of endpoints, and a cloud security configuration audit to ensure alignment with security best practices. The complexity of the environment—distributed APIs, multi-region cloud infrastructure, and high transaction volumes—demanded a structured, in-depth, and scalable security evaluation.

Our Approach

We conducted a full external black-box network penetration test to identify vulnerabilities in internet-facing systems, exposed services, misconfigurations, and potential attack entry points. In parallel, we performed a deep-dive security assessment of more than 300 public-facing APIs. The testing evaluated authentication and authorization controls, session management, input validation, rate limiting, and data exposure risks. All API testing was aligned with the OWASP API Security Top 10 and industry-recognized best practices. Additionally, we carried out a comprehensive cloud security configuration review, assessing IAM policies, access controls, storage security, network segmentation, logging and monitoring configurations, and exposure of cloud services.

Key Findings

The assessment identified multiple security gaps across the environment, including: • Authentication and authorization weaknesses in critical APIs • Weak session handling and insufficient input validation • Cloud misconfigurations exposing sensitive services • Outdated services and patch gaps within the external network These issues presented potential exploitation paths that could impact customer data confidentiality and financial transaction integrity if left unaddressed.

Outcome

The FinTech company received a clear and actionable remediation roadmap addressing network, API, and cloud security risks. Strengthened API authentication and authorization mechanisms, improved cloud access controls, and hardened external services significantly reduced the organization’s attack surface. Cloud configuration optimization enhanced compliance readiness and overall operational security, enabling the organization to confidently scale its digital financial services across the APAC region.