Principal iOS Mobile Developer (Swift)

devtechnology; Reston (VA); Hybrid; USD 100,000 - 160,000; Full time

Benefits offered by this job

Generous PTO

Flexible schedules

Remote work eligible

Tuition reimbursement

401K match

Job summary

Dev Technology Group is seeking an experienced iOS Mobile Developer to build a real-time on-device translation platform for DHS/ICE missions. You will own architecture, performance, and production releases of the iOS app, integrating ML models and coordinating with AWS for OTA updates.

The role requires 8+ years shipping iOS apps in Swift, deep audio processing experience, and familiarity with Core ML/ONNX/TensorFlow Lite.

Qualifications

• 8+ years of production iOS app shipping experience.
• Experience with AVAudioEngine or AudioUnit at the hardware callback level.
• Experience integrating ML or signal-processing frameworks into iOS apps.
• Proficient in memory and performance optimization on constrained devices.
• Experience with background URLSession data transfers.
• Familiar with protocol-oriented design and modular Swift packages.
• Ability to work in a federally compliant environment; security teammates available.

Responsibilities

• Own the iOS application's architecture, performance, and releases.
• Integrate on-device ML frameworks and manage their lifecycle.
• Develop real-time audio pipeline with AVAudioEngine and VAD.
• Implement background model delivery and resilient downloads.
• Enable peer-to-peer transcript sharing via MultipeerConnectivity.
• Ensure Swift concurrency safety across components.

Skills

Swift iOS development

On-device ML integration

AVAudioEngine experience

Memory and performance profiling

URLSession background transfers

MultipeerConnectivity

Swift concurrency

Security/compliance awareness

Tools

Core ML

ONNX Runtime

TensorFlow Lite

Job description

iOS Mobile Developer, #1110

iOS Engineer - On-Device Translation Platform | DHS/ICE Mission Environment

What You'll Build

A real-time speech translation app that runs entirely on-device: audio capture → speech recognition → translation → text-to-speech, coordinated across multiple services on hardware-constrained iPhones. You'll integrate vendor-provided ML models, manage background OTA model delivery from AWS, build peer-to-peer device communication, and ship to production through a federal accreditation pipeline.

What You'll Own

• The iOS application: architecture, performance, memory management, and production releases
• Integration of on-device ML inference frameworks (Core ML, ONNX Runtime, WhisperKit) - loading, lifecycle, error recovery - not training the models
• Real-time audio pipeline: AVAudioEngine, voice activity detection, buffer management at hardware-thread priority
• Background model delivery: resumable multi-file downloads over URLSession, state persistence, network transition handling
• Peer-to-peer transcript sharing between devices via MultipeerConnectivity
• Swift concurrency across all of the above without data races, deadlocks, or jetsam kills on 6GB devices

What You Bring

• 8+ years shipping production iOS apps in Swift
• Direct experience with AVAudioEngine or AudioUnit at the hardware callback level
• Track record integrating ML or signal-processing frameworks into iOS apps (Core ML, ONNX, TensorFlow Lite, or similar)
• Proficiency managing memory and performance on constrained devices using Instruments
• Experience with background URLSession and resilient download/upload systems
• Comfort with protocol-oriented architecture, multi-module Swift packages, and testable service layers
• Ability to hold a clearance and work in a federal compliance environment (FISMA experience is a plus, not a requirement - you'll have security and compliance teammates)

The estimated salary range for this position is $100,000 - $160,000 . This salary range is not a guarantee of compensation. The offered salary will be based on factors including relevant experience, geographic location, internal equity, and applicable contractual requirements. *Compensation may fall outside this range when appropriate.

Who We Are

Dev Technology is a growing IT company with an employee-centric culture that works on mission-critical projects for the federal government. We partner with our federal customers to deliver technology services and solutions, and to drive our client's missions forward through innovation. We use Agile and DevSecOps principles to provide services including application development, biometrics and identity management, cloud and infrastructure optimization, IT and legacy modernization, and data management.

As a Washington Post Top Workplace award winner for the past THIRTEEN years in a row, the Top Workplaces USA for the past five years, and a recipient of the Companies As Responsive Employers (CARE) Award for the past six years, Dev Technology employees enjoy:

• Generous and flexible time-off policy
• Flexible work schedules and telework options, including remote work availability for eligible projects
• Career development opportunities including a mentorship program, technical and management training through Dev University, hands-on learning through DevLab, tuition reimbursement, and paid training opportunities
• Industry-leading benefits including a choice of two health plans that include dental and vision, flexible spending account, commuter benefits, life insurance, and more
• 401K matching with a 5% matching contribution
• Regular team and company social events including our annual party, happy hours, fitness challenges, and more
• A focus on community engagement including company wide support activities, employer match for donations, and time off for volunteer efforts

To learn more about working at Dev Technology, visit Working At Dev Technology Group

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Dev Technology Group operates in the following states: AL, AR, AZ, CO, DC, FL, GA, ID, IL, IN, MD, MA, ME, MI, MN, MO, MS, NC, NJ, OH, OR, PA, SC, TN, TX, VA, WV.