Senior Security Architect - Mobile Banking Platforms 206904-1

Opensource; Gauteng; On-site; ZAR 1,200,000 - 1,800,000; Full time

Job summary

Opensource is seeking an experienced Security Architect to lead the end-to-end security design of a large-scale mobile banking platform. You will govern security across mobile apps, APIs, identity platforms, cloud infrastructure, and DevSecOps pipelines, ensuring Zero Trust alignment and secure authentication.

You will define biometric-first authentication, device-bound credentials, and secure enclave usage, while coordinating with risk, fraud, privacy, and engineering teams.

Qualifications

• TOGAF knowledge and security architecture background required.
• Experience designing end-to-end security for mobile platforms across iOS, Android, web, APIs.

Responsibilities

• Own end-to-end security architecture for a large-scale mobile banking platform.
• Define and govern security across apps, APIs, identity, cloud, and DevSecOps pipelines.
• Architect strong customer authentication using PINs, biometrics, and device-bound keys.
• Lead integration with enterprise key vaults and HSMs for signing, encryption, and key lifecycle management.
• Own OAuth 2.0, OpenID Connect, PKCE, and secure token patterns for mobile and web channels.
• Lead threat modelling across critical customer journeys and data lifecycle controls.

Skills

Mobile security

iOS security

Android security

Threat modelling

OAuth 2.0

OpenID Connect

PKCE

Zero Trust

Biometrics

Secure enclaves

Education

TOGAF

Tools

Secure Enclave

Android Keystore

HSM integration

Enterprise key vaults

Certificate lifecycle

PKCE implementation

Job description

Role Scope:

• Primary domain: Mobile banking platform security architecture across iOS, Android, web, APIs, BFF, cloud, identity, payments, data, DevSecOps, and platform services.


• Accountability: Owns security architecture direction, patterns, architecture decisions, control requirements, and governance across critical customer journeys.


• Stakeholders: Engineering, product, platform teams, cybersecurity, risk, fraud, compliance, privacy, operations, infrastructure, and executive technology leadership.


• Delivery model: Works across agile delivery squads and architecture governance forums to balance security, customer experience, resilience, and delivery velocity.

Duties and Responsibilities

• Own the end-to-end security architecture for a large-scale, customer-facing mobile banking platform.


• Define and govern security across mobile apps, APIs, identity platforms, cloud infrastructure, backend services, shared platforms, and DevSecOps pipelines.


• Architect strong customer authentication using PIN, biometrics, device-bound cryptographic keys, risk context, and transaction-level authorization.


• Design PIN-based authentication models where PINs unlock cryptographic keys and are never stored or transmitted.


• Define biometric-first authentication using Face ID, Touch ID, and platform biometrics through secure enclave and hardware-backed mechanisms.


• Govern secure use of mobile keystores and secure enclaves, including iOS Secure Enclave and Android Hardware Keystore.


• Ensure biometrics are used only for local cryptographic key release and never treated as raw credentials.


• Define integration with enterprise key vaults and HSMs for signing, encryption, certificate handling, and key lifecycle management.


• Own OAuth 2.0, OpenID Connect, PKCE, secure token storage, token rotation, and device-bound session models for mobile and web channels.


• Define API, Backend-for-Frontend, and service security patterns aligned to Zero Trust principles.


• Lead threat modelling across onboarding, authentication, payments, card management, account servicing, and other sensitive customer retirement, and data lifecycle controls.

Required Qualifications: TOGAF

Skills: Mobile security, iOS and Android application security, secure storage, platform security models, jailbreak/root detection, hardening, secure local data handling, mobile threat defense, and mobile application, Authentication PIN-based authentication, biometrics, device-bound credentials, step-up authentication, adaptive authentication, risk-based authentication, and transaction-level authorization., Identity and access OAuth 2.0, OpenID Connect, PKCE, secure token handling, secure session management, token rotation, device-bound sessions, and delegated authorization patterns., Cryptography Cryptographic key lifecycle management, HSM integration, enterprise key vaults, hardware-backed keystores, secure enclave usage, signing, encryption, certificate lifecycle, and cryptography.

Fraud and Risk: Device binding, device attestation, account takeover prevention, transaction risk scoring, behavioral analytics, fraud platform integration, and high-risk transaction controls.