Mobile App Developer (iOS & Android) — VAUBAN Secure Messaging

XMPP Standards Foundation; Dubai; Hybrid; AED 120,000 - 200,000; Full time

Job summary

A privacy-first messaging platform is looking for a Mobile App Developer to create secure messaging apps for iOS and Android. Ideal candidates should have strong skills in Swift and Kotlin, experience in real-time communications, and knowledge of modern cryptography practices. This role offers competitive compensation, flexibility in work location, and a focus on making confidentiality a standard.

Benefits

Competitive salary

Equity or royalties per sale

Performance bonuses

Remote or Dubai HQ option

Relocation/visa support

Qualifications

• Experience building mobile apps, having shipped at least one production app.
• Strong in Swift/SwiftUI and Kotlin, with solid mobile architecture.
• Experience with XMPP/Prosody clients and E2E cryptography.

Responsibilities

• Own the mobile architecture for iOS and Android.
• Build core messaging with encryption and key exchange.
• Implement secure calls using WebRTC.
• Optimize offline/latency performance.
• Maintain app compliance and release notes.
• Collaborate with backend and security teams.

Skills

Mobile apps development

Swift/SwiftUI or Kotlin

XMPP client experience

Real-time communication protocols

WebRTC integration

Notification design

Job description

Overview

VAUBAN is building a privacy-first instant messaging platform for high-stakes users. We’re hiring a Mobile App Developer to develop and ship our native iOS and Android clients for secure messaging, audio and video calls—ideally with XMPP/Prosody client experience and modern E2E cryptography (OMEMO, PQC).

Qualifications

• Experience building mobile apps at scale; shipped at least one production iOS and/or one Android app (or a cross-platform app with native modules).
• Strong in Swift/SwiftUI (or UIKit) and Kotlin/Jetpack (or Java) with solid mobile architecture.
• Real-time comms: XMPP client experience with Prosody or similar servers.
• Security & crypto: OMEMO (or Signal/libsignal), MLS protocole, ideally PQC for future development, key management, device attestation.
• Media and calls: WebRTC (TURN/STUN, SFU basics)
• Push & background: APNs/FCM, notification payload design, background tasks, battery/network efficiency.
• Privacy & compliance: app permissions minimalism, ATT, Google Privacy Sandbox, Play/App Store policies, accessibility/i18n/RTL.

Key Responsibilities

• Own the mobile architecture for iOS and Android (native-first; selective shared modules if justified). Define module boundaries, encryption boundaries, and sync strategies.
• Build core messaging: account & device linking, roster/presence, 1:1 and group chats, E2E key exchange (OMEMO, MLS with potential PQC later on), message retry/ordering, read receipts, media/attachments with on-device encryption.
• Implement secure calls: WebRTC integration, VoIP push, call UI, TURN/STUN configuration, bandwidth adaptation, and graceful failure paths.
• Optimize offline/latency: background sync, smart retry/backoff, delta updates, efficient image/video pipelines, caching strategy.
• Ship quality: unit/UI tests, snapshot tests, end-to-end test harness; CI/CD with staged rollouts, feature flags, crash-free sessions SLOs.
• Store excellence: maintain App Store/Play compliance, privacy nutrition labels, SDK hygiene; own release notes, beta programs, telemetry (privacy-preserving).
• Collaborate with backend and security teams on protocol choices (XMPP/Prosody extensions, WebSocket fallbacks), push schemas, and abuse-resilience.
• Mentor future mobile hires; establish coding standards

Our Offering

• Compensation: Competitive salary + equity or royalties per sale; performance bonuses tied to reliability and security milestones.
• Flexibility: Remote or Dubai HQ (hybrid); relocation/visa support available.
• Mission: Make confidentiality a standard not an ideal.

How to apply: Send your CV + links (GitHub/TestFlight/Play Store) and describe 1–2 projects you lead and what you would have done differently / better. At the following email: [e-mail]