ISO 27001 Controls Every Developer Should Apply When Building System Integrations

A software integration developer has outlined the ISO 27001:2022 Annex A controls most relevant to connecting systems such as ecommerce platforms, ERPs, and CRMs. The core security risk in integrations lies not in the database itself but in the data's journey across networks that developers do not control, exposing sensitive fields like names, tax IDs, and emails. Key controls highlighted include enforcing TLS encryption in transit, storing API keys in secret managers with least-privilege scoping, and transferring only the minimum data fields a destination system actually requires. The article also stresses tamper-evident logging with masked sensitive fields, since logs are a common accidental leak point for personal data. Additionally, developers acting as integration suppliers must maintain written data processing agreements and assess sub-processors, as third-party tools like iPaaS platforms do not automatically ensure compliance on their own.