Principal iOS Mobile Developer (Swift)

Dev Technology; Reston (VA); On-site; USD 100,000 - 160,000; Full time

Benefits offered by this job

Flexible time-off policy

Remote work availability for eligible

Tuition reimbursement

Health plans with dental and vision

401K matching

Job summary

Dev Technology seeks an iOS Engineer to build an on-device real-time translation platform for federal work. You’ll own the iOS app architecture, integrate Core ML/ONNX/WhisperKit, and optimize audio pipelines using AVAudioEngine and Swift concurrency.

Expect collaboration with security/compliance teams and production-ready releases for devices with limited memory. Requirements include 8+ years shipping iOS apps in Swift, experience with ML frameworks, and a background URLSession.

Qualifications

• 8+ years shipping production iOS apps in Swift.
• Direct experience with AVAudioEngine or AudioUnit at the hardware callback level.
• Experience integrating ML frameworks into iOS apps (Core ML, ONNX, TensorFlow Lite).
• Memory and performance optimization on constrained devices.
• Experience with background URLSession and resilient download/upload systems.
• Comfort with multi-module Swift packages and testable service layers.
• Eligible for security/compliance work in a federal environment.

Responsibilities

• Own iOS application architecture, performance, memory management, and releases.
• Integrate on-device ML inference frameworks and manage their lifecycles.
• Maintain real-time audio pipeline with AVAudioEngine and VAD.
• Ensure Swift concurrency safety on 6GB devices.

Education

Bachelor's degree in Computer Science or related field

8+ years shipping production iOS apps in Swift

Tools

Core ML

ONNX Runtime

WhisperKit

TensorFlow Lite

AVAudioEngine

AudioUnit

Instruments

Job description

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
• 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

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.

This position involves working on a contract for the US Government. The US Government requires US citizenship for this position.**NOTE: This position cannot support a Work Visa or Green Card status. Providing false information regarding your US Citizenship status on this application will result in your application being rejected for this opportunity.Can you meet this requirement? * Select...

This position supports our ICE (U.S. Immigration and Customs Enforcement) contract. Are you comfortable working in a role that supports this customer? * Select...

If you currently hold a clearance, please indicate which security clearance you currently hold: *

Dev Technology requires all candidates who receive a verbal offer to successfully complete an identity verification before a written offer can be issued. Are you willing to complete this required step of the hiring process? * Select...

Do you have a minimum of a Bachelor’s degree in Computer Science, Software Engineering, Information Systems, Cybersecurity, or a closely related field? * Select...

Do you have 8+ years of experience shipping production iOS apps in Swift? * Select...

Do you have experience with AVAudioEngine or AudioUnit at the hardware callback level? * Select...

As part of our final interview and identity‑verification process, candidates may be required to attend an in‑person interview at Dev Technology’s headquarters in Reston, Virginia. Any travel reimbursement would be determined on a case‑by‑case basis and must be approved in advance. If selected for an in‑person interview, are you willing and able to participate? * Select...

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Fully Remote position candidates must have a primary address in one of 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.Can you meet this requirement? * Select...

If No, are you willing to relocate to one of the above locations: Select...

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For government reporting purposes, we ask candidates to respond to the below self‑identification survey. Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

As set forth in Dev Technology’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

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We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

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