iOS Engineer

We're building the world's first invisible biometric authentication system at TWOSENSE.AI. Our technology recognizes users by their unique behaviors—how they type, swipe, and move—eliminating passwords and security friction. No more authentication headaches, just seamless security that works in the background.

We're an engineer-founded team of PhDs and exceptional developers who value autonomy, transparency, and technical excellence. This is a fully remote position where you'll directly shape our product and your career trajectory.

What You'll Do

You'll lead the development of our iOS application that collects and processes behavioral biometric data, with a strong emphasis on privacy, efficiency, and performance. This app will run in the background and authenticate the user based on how they walk with the phone in their pocket, how they swipe and interact with the screen, how they pick up and hold the device, and more. The initial use case is frictionless authentication for doctors and nurses in a hospitals, where every second counts in delivering patient care:

• Build secure data collection systems for sensors, user interactions, and other behavioral data with robust background processing capabilities
• Create APIs and frameworks that allow other iOS applications and cloud systems to integrate with our authentication system
• Optimize performance to ensure minimal battery impact while maintaining reliable continuous operation
• Build credential management features using iOS Wallet framework and NFC capabilities to enable instant, tap-based authentication
• Navigate iOS ecosystem challenges including permissions, App Store requirements, and enterprise deployment

Requirements

What We're Looking For

Must-haves:

• 4+ years of iOS development experience with apps in production
• Experience with building native iOS apps using Objective-C and Swift
• Deep knowledge of iOS architecture, background processing, and push notifications
• Strong understanding of iOS security features and limitations
• Excellent problem-solving skills and attention to performance details

Nice-to-haves:

• Experience with security products or authentication systems (OAuth/OIDC)
• Experience with Core Motion, Core Location, Core Bluetooth, or HealthKit
• Background in behavioral biometrics or continuous data collection

Benefits

Why Join Us

• Fully remote - Work from anywhere
• Meaningful equity - Own a piece of what you build
• Flexible PTO - Take time when you need it
• Monthly project days - Dedicate one day a month to something you’re passionate about
• Online learning resources - O'Reilly, Pluralsight, technical books, etc…
• Team gatherings - Travel covered for company meet-ups and team events
• Full tech setup - High-end equipment, VPN, and resources provided

We're growing fast, and you'll have plenty of opportunities to shape the company, influence our direction, and rapidly grow your career.