Mobile Developer
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Before you apply
LocationBucharest
Typefull-time
SeniorityMid
Experience3–5 yrs
DepartmentEndpoint
Company size1,001–5,000 people
PostedSep 30, 2026 · 1mo ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
3–5 years of production mobile application development experience
Strong mastery of Kotlin and modern Android SDKs
Experience with asynchronous programming (Kotlin Coroutines, Flow)
Solid grasp of Android architecture components (Jetpack, ViewModel, Navigation, Hilt/Koin)
In-depth understanding of Android OS internals, permissions models, IPC, and background execution policies
1–2+ years of hands-on experience building and shipping iOS applications in Swift
Familiarity with Swift Concurrency (async/await, Actors) or Combine
Strong working knowledge of network protocols (TCP/IP, TLS/SSL, DNS, HTTP/3)
Experience with certificate pinning, public key infrastructure (PKI), and secure data storage (Android Keystore, iOS Keychain)
Proficiency with Git, code reviews, unit testing, and modular architecture
Clear communication skills and the ability to collaborate asynchronously across distributed teams
Prior domain experience in Mobile Threat Defense (MTD), Endpoint Detection and Response (EDR), VPN apps, or security SDK development
Experience with low-level Android components via JNI / C++ (Android NDK)
Familiarity with Samsung Knox SDK or custom OEM management extensions
Direct experience writing custom iOS Network Extensions (NEPacketTunnelProvider, NEFilterDataProvider)
Familiarity with App Store and Google Play enterprise distribution mechanisms, managed app configurations (AppConfig), and zero-touch enrollment
Skills
Kotlin
Swift
SwiftUI
UIKit
Objective C
Jetpack
ViewModel
Navigation
Hilt
Koin
WorkManager
Android SDK
NetworkExtension
Packet Tunnel Provider
Content Filtering
Google Play Integrity API
Git
CI/CD
MDM
UEM
Microsoft Intune
VMware Workspace ONE
JNI
C++
Android NDK
Samsung Knox SDK
About the company
Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide. Guardian over millions of consumer, enterprise, and government environments, Bitdefender is one of the industry’s most trusted experts for eliminating threats, protecting privacy, digital identity and data, and enabling cyber resilience. With deep investments in research and development, Bitdefender Labs discovers hundreds of new threats each minute and validates billions of threat queries daily. The company has pioneered breakthrough innovations in antimalware, IoT security, behavioral analytics, and artificial intelligence and its technology is licensed by more than 180 of the world’s most recognized technology brands. Founded in 2001, Bitdefender has customers in 170+ countries with offices around the world. For more information, visit https://www.bitdefender.com
About the role
We are looking for a Mobile Developer to lead native Android development while contributing to our iOS client for our Mobile Threat Defense (MTD) platform. In this role, you will build and scale client-side security engines designed to detect, analyze, and mitigate mobile threats—including network interception, malware, OS vulnerabilities, and device tampering.
Android will be your primary focus (~70%), where you will work closely with system-level APIs, network services, and background workers. You will also maintain and implement parallel security capabilities on iOS (~30%). This position is ideal for an engineer who understands mobile OS internals, cares deeply about performance and battery efficiency, and wants to work at the intersection of mobile architecture and cybersecurity.
Key Responsibilities
Android Development (Primary Focus)
Design, implement, and maintain core threat-detection modules on Android using modern Kotlin.
Implement OS-level integrations, including local VPN services (VpnService), network traffic inspectors, device administration hooks, and Android Enterprise / Work Profile APIs.
Build resilient, battery-optimized background routines utilizing WorkManager and foreground services compliant with modern Android background execution limits.
Integrate anti-tampering, reverse-engineering mitigations, root detection, and Google Play Integrity API verification.
iOS Development (Secondary Focus)
Develop, update, and maintain threat detection features for the iOS agent in Swift (SwiftUI / UIKit / Objective C).
Work with iOS security frameworks and network extensions (e.g., NetworkExtension, Packet Tunnel Provider, Content Filtering).
Implement jailbreak detection, bundle integrity verification, and DeviceCheck / App Attest APIs.
Architecture, Performance & Delivery
Maintain clean, decoupled architectures (MVVM or MVI) to ensure parity of business logic and telemetry across both platforms.
Optimize client performance to achieve continuous threat monitoring with minimal resource, memory, and battery footprint.
Build and maintain automated unit, integration, and UI tests; integrate code into CI/CD pipelines.
Support enterprise application distribution through Mobile Device Management (MDM/UEM) platforms (e.g., Microsoft Intune, VMware Workspace ONE) alongside public store releases.
Qualifications & Skills
Must-Have Requirements
Professional Experience: 3–5 years of production mobile application development experience.
Android Proficiency:
Strong mastery of Kotlin and modern Android SDKs.
Experience with asynchronous programming (Kotlin Coroutines, Flow).
Solid grasp of Android architecture components (Jetpack, ViewModel, Navigation, Hilt/Koin).
In-depth understanding of Android OS internals, permissions models, IPC, and background execution policies.
iOS Working Knowledge:
1–2+ years of hands-on experience building and shipping iOS applications in Swift.
Familiarity with Swift Concurrency (async/await, Actors) or Combine.
Networking & Security Fundamentals:
Strong working knowledge of network protocols (TCP/IP, TLS/SSL, DNS, HTTP/3).
Experience with certificate pinning, public key infrastructure (PKI), and secure data storage (Android Keystore, iOS Keychain).
Engineering Rigor:
Proficiency with Git, code reviews, unit testing, and modular architecture.
Clear communication skills and the ability to collaborate asynchronously across distributed teams.
Nice-to-Have / Preferred Qualifications
Prior domain experience in Mobile Threat Defense (MTD), Endpoint Detection and Response (EDR), VPN apps, or security SDK development.
Experience with low-level Android components via JNI / C++ (Android NDK).
Familiarity with Samsung Knox SDK or custom OEM management extensions.
Direct experience writing custom iOS Network Extensions (NEPacketTunnelProvider, NEFilterDataProvider).
Familiarity with App Store and Google Play enterprise distribution mechanisms, managed app configurations (AppConfig), and zero-touch enrollment.