Senior Mobile Engineer, iOS/Android

Toptal

Senior Mobile Engineer developing a consumer app for a new class of consumer hardware for iOS and Android. Focused on commerce, connectivity, and computer vision as foundational hire.

Posted 4/27/2026full-timeRemote • New York • 🇺🇸 United StatesSeniorWebsite

Tech Stack

Tools & technologies

AndroidiOSKotlinOpen SourceSwift

About the role

Key responsibilities & impact

Own architecture, delivery, and quality of the consumer app in iOS and Android.
Design and ship the commerce experience, including payments and order flows.
build the computer-vision-based measurement pipeline: AprilTag detection, pose estimation, camera calibration, multi-frame fusion, and the accompanying capture UX.
Build the BLE / Wi-Fi connectivity layer and device control surface, in partnership with firmware.
Set up and maintain the app’s production infrastructure: CI/CD, crash reporting, analytics, feature flags, and release management.
Partner with design on onboarding, error states, and the craft details that define a consumer-grade experience.
Contribute to mobile team growth: technical bar-setting, interviewing, and mentorship as the team scales.

Requirements

What you’ll need

Bachelor’s degree is required.
5+ years shipping production consumer mobile apps. The candidate should be able to point to at least one publicly available app they built or significantly contributed to.
Deep expertise in at least one native platform (Swift / SwiftUI or Kotlin / Compose) and working knowledge of the other. Cross‑platform shipping experience preferred.
Direct experience shipping commerce features: checkout, payments (Stripe, Apple Pay, Google Pay), and related flows.
Computer vision experience on mobile. The candidate should understand camera calibration, coordinate frames, pose estimation, and homographies — not just at an API‑call level. Hands‑on experience with AprilTag, ArUco, ChArUco, or comparable fiducial / feature‑based tracking work is required. Candidates with equivalent SLAM, photogrammetry, or AR measurement experience should be considered.
Strong product sensibility and attention to craft. The candidate should care about the experience at the level of motion, copy, and error handling, not only functional correctness.
Experience with connected hardware: BLE, Wi‑Fi provisioning, OTA firmware updates, Matter / Thread, HomeKit, or Google Home.
Background in AR, 3D reconstruction, or spatial computing (published work, open source, or shipped product).
Experience at an early‑stage startup, particularly one shipping both hardware and software.
Subscription or recurring‑revenue commerce experience.
Comfort working closely with designers and hardware/firmware engineers.
Outstanding written and verbal communication skills.
Ability to work in a fast-paced, rapidly growing company and handle a wide variety of challenges, deadlines, and a diverse array of contacts.

Benefits

Comp & perks

Participation in a 401(k) retirement plan
Medical, dental, and vision health insurance plans
Basic life insurance coverage
Short-term and long-term disability coverage
Access to flexible spending, dependent care, and health savings accounts
Access to telehealth virtual doctors
An employee assistance program
Flexible paid time off

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

SwiftSwiftUIKotlinComposecomputer visionAprilTagpose estimationcamera calibrationBLEWi-Fi

Soft Skills

product sensibilityattention to craftcommunication skillsmentorshipinterviewingcollaborationadaptabilityproblem-solvingteam growthattention to detail

Certifications

Bachelor's degree