Senior iOS Developer

KWI

. Design, build and ship features in the KWI POS app for iPhone and iPad, mostly in Swift using Xcode .

Posted 11/6/2026full-timeMelville • New York • United StatesSenior💰 $135,000 - $145,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in designing and developing iOS applications using Swift, with a strong focus on app architecture, state management, and automated testing. Experienced in integrating with payment devices and enhancing app performance while ensuring seamless offline functionality.

Highest-signal resume keywords

Swift Application DevelopmentIOS App ArchitectureAI Coding Tools UsageAutomated Testing CommitmentAgile Delivery Experience

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Hard Skills

SwiftObjective-CSwiftUISwift ConcurrencyUIKitRESTful APIsSQLiteCore DataXCTestCI/CD

Soft Skills

Clear CommunicationMentoring

Tools & Technologies

XcodeJiraGitJenkinsFastlaneClaude CodeCursorGitHub Copilot

Certifications & Qualifications

BS in Computer ScienceEngineering Degree

Industry Keywords

IOS DevelopmentOffline-First AppsPayment IntegrationsRetail TechnologyApp Store Distribution

Tech Stack

Tools & technologies

iOSJavaJenkinsObjective-CSQLiteSwiftGo

About the role

Key responsibilities & impact

Design, build and ship features in the KWI POS app for iPhone and iPad, mostly in Swift using Xcode
Work with the lead developer on app architecture and own the iOS side of each feature, including state management, error handling and test coverage
Build AI-driven features that help retail associates sell
Work from specifications created with Product, Design and QA, and help improve those specifications before coding
Use AI coding tools daily to write, test and refactor code and help improve team usage
Improve offline mode so stores can continue selling without a network and reconcile when connectivity returns
Build and support integrations with payment devices and store hardware, including card readers, receipt printers and scanners
Retire legacy Objective-C and modernize the app with Swift, SwiftUI and Swift concurrency where appropriate
Improve performance, stability and crash rates using collected telemetry
Troubleshoot production issues in client stores, including client-specific configuration problems
Review code, mentor engineers and partner technically with the offshore development team
Develop Java or Go web-service changes as needed

Requirements

What you’ll need

BS in Computer Science or Engineering, or equivalent work experience
6+ years of professional software development, including 5+ years building native iOS apps in Swift that shipped to production
Enough Objective-C to read, debug and safely migrate legacy code
Deep knowledge of UIKit and the iOS app lifecycle
Working experience with SwiftUI and Swift concurrency (async/await)
Experience integrating iOS apps with RESTful APIs
Understanding of how the app and its services work together
Experience building offline-first apps using local persistence (SQLite or Core Data), sync and conflict handling
Daily, hands-on use of AI coding tools such as Claude Code, Cursor or GitHub Copilot
Strong testing habits: unit and UI tests with XCTest
Commitment to automated testing
Experience with Git, CI/CD for iOS (Jenkins, Fastlane or similar), code signing and App Store or enterprise distribution
Experience with Agile delivery (Kanban or Scrum) and tracking work in Jira
Discipline to work in a codebase where a mistake can stop a store from selling
Clear communication when something goes wrong

Benefits

Comp & perks

Full Medical, Dental and Vision
Annual bonus eligible
Free gym in the building
Generous PTO policy
Summer Fridays....all year round
Tuition Reimbursement
Discount from building café
401(K) with a 50% company match (up to 6% of employee contribution)
Employee Referral Program
(1) Volunteer day each year
Hybrid schedule with in-office days Monday, Tuesday and Thursday and remote work Wednesdays and Fridays
Monthly events
Bagels every Thursday
State-of-the-art coffee machine
Full snack pantry
Inclusive, equal-opportunity work environment