Senior Kotlin Developer

Tech stack:

Kotlin Multiplatform (KMM)
Kotlin and mobile development (Android or cross-platform)
OAuth 2.0, OpenID Connect

Requirements:

• Strong experience with Kotlin and mobile development (Android or cross-platform)

• Hands-on experience with Kotlin Multiplatform Mobile (KMM)

• Solid understanding of authentication and authorization protocols (OAuth 2.0, OpenID Connect)

• Experience working with identity providers and secure session/token management

• Good understanding of mobile security best practices

• Experience implementing or working with Zero Trust Architecture principles

• Familiarity with secure storage solutions on mobile platforms

• Strong problem-solving skills and attention to detail

• Good command of English (B2+)

Nice to have:

• Experienced in using AI tools in day-to-day workflow

• Experience with mobile security frameworks or SDKs

• Knowledge of device security signals and threat detection mechanisms

• Background in cybersecurity or working with security teams

• Experience in enterprise-scale environments

Project description:

We are looking for a Kotlin Multiplatform Engineer to join a security-focused initiative within a large international organization.

The project is centered around implementing Zero Trust Architecture principles in mobile applications, with a strong emphasis on secure authentication, identity management, and runtime protection.

You will work closely with security architects and cross-functional teams to build secure, scalable, and high-quality mobile solutions.

Main responsibilities:

• Develop and maintain cross-platform modules using Kotlin Multiplatform Mobile (KMM)

• Design and implement secure authentication and authorization flows (OAuth 2.0, OpenID Connect, MFA, SSO)

• Integrate with identity providers and enforce Zero Trust principles (least privilege, continuous verification)

• Collaborate with security architects to embed security best practices into mobile client design

• Ensure secure storage of credentials and tokens using platform-specific secure storage mechanisms

• Monitor and respond to runtime security signals (e.g., device integrity, jailbreak/root detection)

• Write clean, maintainable, and testable Kotlin code for both shared and platform-specific modules