Senior iOS Developer (Mobile)

TL;DR

Senior iOS Developer (Mobile): Architecting and building a high-security messaging and calling platform with an accent on encryption-sensitive image data processing and hardware-leveraged security. Focus on building seamless cross-platform communication, integrating complex VoIP systems via CallKit, and hardening the application against tampering and privacy leaks.

Location: Remote or hybrid in Vilnius, Lithuania.

Salary: From €4,800/month (calculated from €30/h).

Company

hirify.global is a technology incubator with over a decade of experience building and scaling disruptive, innovative digital products.

What you will do

• Architect and develop a new iOS application based on an existing Android platform.
• Build a secure messaging pipeline that renders and transmits messages as bitmaps instead of plain text.
• Implement encrypted calling features using iOS hardware security capabilities and CallKit.
• Integrate pre-built blockchain identity modules.
• Apply rigorous platform security hardening, including anti-tampering and traffic protection measures.
• Collaborate with the original Android developer to ensure protocol compatibility.

Requirements

• 5+ years of iOS development experience with Swift.
• Proficiency in Objective-C for bridging legacy APIs and C/C++ libraries.
• Strong knowledge of Core Graphics and Metal for bitmap rendering.
• Critical experience with iOS VoIP development and CallKit integration.
• Practical experience in iOS security hardening and App Store compliance.

Nice to have

• Experience with E2E encryption frameworks like Signal Protocol.
• Background in Web3 identity or wallet-like key management.
• Experience navigating App Store review for encrypted/anonymous communication apps.
• Familiarity with penetration testing or security audits of mobile applications.

Culture & Benefits

• Flexible work environment with remote-friendly culture.
• Paid training and conference attendance budget.
• Additional health insurance coverage.
• Open and informal culture focused on building startups.
• Flexible time-off policy.