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Software Engineer (Team Lead) · iOS & macOS Developer

Usama Yamaan

I build native apps for iPhone and Mac — and I ship them.

I build with Swift, SwiftUI, UIKit and AppKit, and many of those apps are live on the Mac App Store right now. Each one carried from an empty Xcode project through architecture, API integration and in-app purchases, to an approved listing and the updates that followed.

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Live on the Mac App Store
See the work →
01About

Apple platforms,
end to end.

Based in
Faisalabad, Pakistan
Education
BS Software Engineering
National University of Computer & Emerging Sciences (FAST-NUCES) · 2020 — 2024
Languages
SwiftTypeScriptJavaScriptPythonC++HTML / CSS

I'm a software engineer who builds native applications for Apple platforms, currently leading development as a Software Engineer (Team Lead) at Tricentric Labs. At AppLead I took apps from a first commit through to a live App Store listing — designing the architecture, building the interface in SwiftUI, UIKit and AppKit, wiring up REST and AI APIs, handling in-app purchases, and running the release itself in App Store Connect.

The work isn't only client-side. I've built OCR and PDF pipelines, real-time translation with speech-to-text and text-to-speech, background download queues, video and audio conversion, and LLM integrations. Before I specialised in Apple platforms I worked across the MERN stack and AI/ML, which is why I'm comfortable owning the API and backend half of a feature rather than waiting for someone else to define it.

What I care about is the last ten percent — the app that is actually approved, actually installed, and actually still being updated three versions later.

Relevant coursework

Data Structures & Algorithms · Database Systems · Software Design & Analysis · Artificial Intelligence · Web Programming · Information Security · Data Science

02Featured work

Live on the Mac App Store

A selection of the apps I've shipped that are on the store today — every one downloadable right now. Each was built natively for macOS and taken through App Store Connect: submission, review, release, and the updates that followed.

01Education · Productivity

AI Assistant

Chat, Code & PDF

  • macOS 15+
  • Version 1.3
  • Shipping since Jun 2026

AI tools live scattered across a dozen browser tabs. This app collapses chat, a code studio, document analysis, research and web browsing into a single native Mac workspace so a piece of work never has to leave the window it started in.

My role

Built the macOS client end to end — the multi-workspace architecture, streaming LLM integration, the embedded browser, subscription handling, and the App Store release across three shipped versions.

  • AI Chat workspace for conversation and long-form generation
  • Code Studio that writes, explains and debugs code
  • Research Hub for gathering and summarising sources
  • Smart Documents for structured notes and reports
  • Built-in AI Browser with the workspace kept in context
  • Artifacts — generated interactive projects and web pages
  • Swift
  • AppKit
  • LLM APIs
  • WebKit
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
AI Assistant — macOS
AI Assistant screenshot 1AI Assistant screenshot 2AI Assistant screenshot 3AI Assistant screenshot 4
02Business · Productivity

CV Builder

ATS Templates

  • macOS 13+
  • Version 1.1
  • Shipping since Aug 2026

Most résumé builders are web apps that hold your document behind an account and hand back a flattened PDF. This one runs entirely on the Mac, works offline with no sign-up, and exports vector PDF with real selectable text — which is what applicant tracking systems can actually parse.

My role

Built the document engine and the editor: the live-preview layout with genuine page breaks, the templating system behind 42 designs, vector PDF export, autosave, and the subscription and lifetime purchase tiers.

  • 42 templates across Professional, ATS-Friendly, Modern, Executive, Creative and Minimal styles
  • Live preview with real page breaks and multi-page documents
  • Design switching that carries all content across untouched
  • Sections for experience, education, skills, languages, projects and references
  • Vector PDF export with selectable, machine-readable text
  • Autosaves every résumé variant; fully offline, no account
  • Swift
  • AppKit
  • PDF Generation
  • Document Templating
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
CV Builder — macOS
CV Builder screenshot 1CV Builder screenshot 2CV Builder screenshot 3CV Builder screenshot 4
03Business · Social Networking

Upworkify

AI Proposal Writer

  • macOS 13+
  • Version 1.0
  • Shipping since Aug 2026

Freelancers who win work by applying to job posts run their whole pipeline across browser tabs, a notes app and a spreadsheet. Upworkify pulls proposal writing, lead tracking and billable hours into one Mac workspace — and connects to no freelance platform at all, so nothing depends on someone else's API.

My role

Built the macOS app: the proposal generation pipeline, the five-stage lead pipeline, and a multi-timer time logger that survives quitting the app mid-session.

  • Generates a proposal written around the specific job posting rather than a reusable template
  • Writes from the job alone when no background is supplied, instead of inventing experience
  • Proposal history saved automatically and reopenable at any time
  • Lead pipeline across five stages — Saved, Applied, Interview, Won, Lost — with budget, client and notes
  • Multiple concurrent timers with pause and resume; paused time never counts toward the total
  • A running timer is paused and saved on quit rather than lost
  • Swift
  • AppKit
  • LLM APIs
  • Local Persistence
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
Upworkify — macOS
Upworkify screenshot 1Upworkify screenshot 2Upworkify screenshot 3Upworkify screenshot 4
04Books · Travel

LabelFlow

Label Maker & Document Printer

  • macOS 12+
  • Version 1.0
  • Shipping since Aug 2026

Printing a label on a Mac usually means a printer-brand utility that only talks to one device, or a full design tool that's overkill. LabelFlow puts a real label designer and a general document printer in one native app that drives a wide range of wireless and thermal printers.

My role

Built the app for macOS — the canvas-based label designer, barcode and QR generation, the multi-format document printing pipeline, and the store release.

  • Label designer with templates, custom text, fonts, colours, icons and images
  • Barcode and QR code generation
  • Printing for PDF, Word, Excel, PowerPoint and photos
  • Wireless and thermal printer support across Canon, Epson and Nimbot
  • Presets for shipping, address, product, price, barcode, storage and cable labels
  • Localised into 25 languages
  • Swift
  • AppKit
  • macOS Printing
  • Barcode & QR Generation
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
LabelFlow — macOS
LabelFlow screenshot 1LabelFlow screenshot 2LabelFlow screenshot 3LabelFlow screenshot 4
05Education · Business

Chatbot

Ask AI Anything

  • macOS 14+
  • Version 1.4
  • Shipping since May 2026

Getting writing help, PDF summarising and voice conversation normally means paying for three separate AI subscriptions. This is one native Mac app with model switching, so the strengths of different models are available without leaving the workspace.

My role

Built the macOS app: the multi-model chat layer over the OpenAI API, voice conversation with speech input, the PDF summarisation pipeline, and four shipped update cycles since launch.

  • Switch between multiple AI models inside one conversation surface
  • Voice chat with speech input for hands-free use
  • Grammar checker and text humaniser
  • PDF summariser with document insights
  • Presentation and diagram generation
  • Writing assistant, résumé builder and research tools
  • Swift
  • AppKit
  • OpenAI API
  • Speech-to-Text
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
Chatbot — macOS
Chatbot screenshot 1Chatbot screenshot 2Chatbot screenshot 3Chatbot screenshot 4
06Utilities · Photo & Video

Convertio

File Converter

  • macOS 14+
  • Version 1.3
  • Shipping since May 2026

Converting a HEIC or a MOV usually means uploading a personal file to somebody else's website. Convertio does video, image, audio and document conversion locally on the Mac with a drag-and-drop workflow.

My role

Built the conversion engine and the macOS interface — format handling across four media families, batch processing with ZIP output, and the conversion history store.

  • Video: MP4, MOV, MKV, AVI, WebM, FLV, WMV, M4V
  • Image: HEIC, HEIF, PNG, JPG, WebP, GIF, TIFF, BMP, SVG, AVIF
  • Audio: MP3, M4A, WAV, FLAC, AAC, OGG, AIFF
  • Documents: PDF, DOCX, DOC, RTF, TXT, EPUB
  • Drag-and-drop batch conversion with ZIP download
  • Persistent conversion history
  • Swift
  • AppKit
  • Video & Audio Processing
  • Image Conversion
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
Convertio — macOS
Convertio screenshot 1Convertio screenshot 2Convertio screenshot 3Convertio screenshot 4
07Utilities · Productivity

Browser Manager

All Browsers

  • macOS 13+
  • Version 1.1
  • Shipping since Jul 2026

Every link on a Mac opens in one default browser, which is wrong for anyone keeping work and personal browsing apart, or testing across engines. Browser Manager intercepts links system-wide and routes each one to the browser it belongs in.

My role

Built the menu bar app and the routing layer — system-wide link interception, per-app browser defaults, and a rules engine matching on domain, URL pattern and source application.

  • Intercepts links from any app — Mail, Slack, Messages, Notes — and picks the browser
  • Quick launch: paste a URL into the menu bar and choose where it opens
  • Per-app defaults, so work apps and personal apps open in different browsers
  • Rules matching on domain, URL pattern or source application, routing with no prompt
  • Supports Safari, Chrome, Firefox, Edge, Arc, Brave, Opera and Vivaldi, including profiles
  • Native menu bar app, keyboard-driven and always resident
  • Swift
  • AppKit
  • Menu Bar App
  • URL Handling
  • In-App Purchases
  • App Store Connect
View on the Mac App Store
Browser Manager — macOS
Browser Manager screenshot 1Browser Manager screenshot 2Browser Manager screenshot 3
08Education · Games

Kids Learning & Fun Games

Preschool ABC, Art & Play

  • macOS 14+
  • Version 1.2
  • Shipping since Jul 2026

Children's apps tend to be either flatly educational or games with nothing underneath them. This one teaches letters, numbers, shapes and memory, then hides the same skills inside four original arcade games — offline, with a parental gate in front of every purchase.

My role

Built the whole app: the custom drawing tools, four arcade mini-games with their own game loops, the star-based progression system, and a 32-language localisation including full right-to-left support.

  • ABC & 123 with voice audio and quizzes
  • Counting, shape matching and memory games across graded levels
  • Free drawing with brush, marker, pencil, spray and eraser, plus gallery and restore
  • Four original arcade games — Catch!, Bubble Pop, Splotch Says and Color Sort
  • Three-star progression with unlocking levels
  • Works fully offline; parental gate on all purchases
  • Swift
  • AppKit
  • Custom Drawing & Animation
  • Audio Playback
  • Localisation & RTL
  • In-App Purchases
View on the Mac App Store
Kids Learning & Fun Games — macOS
Kids Learning & Fun Games screenshot 1Kids Learning & Fun Games screenshot 2Kids Learning & Fun Games screenshot 3Kids Learning & Fun Games screenshot 4
Also built

Apple-platform work at AppLead

Cross-platform iOS and macOS applications built alongside the store releases above, each tuned separately for UIKit and AppKit.

PDF Editor

Scan, edit, sign and lock documents

iOS

A single place to get a paper document into a phone and back out again as a finished, signed, protected PDF — without pushing it through a web service.

  • Document scanning straight from the camera
  • OCR text extraction from scans and images
  • Full PDF editing
  • Signature capture and placement
  • Swift
  • UIKit
  • Core Data
  • OCR
  • Apple Native Frameworks

Pro Translator

Real-time translation across 100+ languages

macOS

Translation that keeps up with a live conversation, works after the fact, and leaves you with something you can file — not just a box you paste into and copy out of.

  • Real-time translation across more than 100 languages
  • Speech-to-text and text-to-speech for hands-free use
  • Automatic accent identification
  • Offline storage, favourites and full history
  • Swift
  • AppKit
  • Core Data
  • LLM Integration
  • Speech-to-Text
  • Text-to-Speech

TikTok Video Downloader

Cross-platform HD downloading

iOS & macOS

Saving videos reliably at full quality, in the background, without the download dying the moment the app loses focus.

  • HD output with background download queues
  • In-app video viewer built on WebView, close to the native browsing experience
  • Alamofire networking for fast, reliable transfers
  • Realm for local storage and offline access
  • Swift
  • UIKit
  • AppKit
  • Alamofire
  • Realm
  • SwiftyStoreKit
  • Firebase
  • WebKit

Video-to-Audio Converter

Extract audio from video

iOS & macOS

Pulling a clean audio track out of a video file directly on the device.

  • Audio extraction from video files
  • Built for both iOS and macOS
  • Performance-tuned per platform
  • Swift
  • UIKit
  • AppKit
  • Media Processing
Beyond Apple platforms

Backend, web and AI/ML

The work that means I can own the API side of a feature rather than wait for someone else to define it.

AI Career Finder

Career pathing and automation-risk prediction

Web

People choosing a direction have no grounded way to judge which paths suit them, or how exposed those paths are to automation.

  • Analyses skills, education and experience to recommend career paths
  • Predicts job risk from AI automation
  • Recommendation engine for relevant skills and courses
  • Python
  • AI/ML
  • Recommendation Systems

FlickNest

Film and TV discovery platform

Web

Tracking what you want to watch, what you've watched and what you thought of it, across two content APIs, in one place.

  • Personalised watchlists, ratings and reviews
  • Recommendations and advanced search
  • Progress tracking and gamification
  • TMDb and OMDb API integration
  • React
  • Redux
  • Tailwind CSS
  • REST APIs
Source

Apparel-PLM

Product lifecycle management for garment manufacturing

Web

Garment counting and tracking on a factory floor is manual, slow and error-prone, and the record never quite matches the shelf.

  • Real-time garment tracking through the production lifecycle
  • Automatic garment counting via image processing
  • Team collaboration across the manufacturing process
  • Web Stack
  • Image Processing
  • REST APIs
Source

MERN Authentication Systems

Secure auth with Google login and email OTP

Web

Authentication is the part everyone rebuilds and most people get subtly wrong.

  • Google login integration
  • Email OTP verification on signup and signin
  • Redux-managed client session state
  • Node.js and MongoDB backend
  • Node.js
  • Express.js
  • MongoDB
  • React
  • Redux
Source
03Tech stack

What I work with

Grouped by what each part of the stack is actually for, rather than listed as one undifferentiated pile of logos.

Apple Development

01

Where I do my strongest work

  • Swift
  • SwiftUI
  • UIKit
  • AppKit
  • Xcode
  • Core Data
  • WebKit
  • CocoaPods

Architecture & Patterns

02

How the apps are structured

  • MVVM
  • MVC
  • Singleton
  • Core Data
  • Realm
  • Offline-first storage

Backend & APIs

03

The half most iOS engineers hand off

  • REST APIs
  • Node.js
  • Express.js
  • MongoDB
  • Alamofire
  • Next.js
  • EJS

AI, Media & Data

04

The features that make apps worth buying

  • LLM & OpenAI APIs
  • OCR
  • Real-time translation
  • Speech-to-text & TTS
  • Video & audio processing
  • AI/ML with Python

Cloud & Services

05

What keeps a shipped app healthy

  • Firebase Analytics
  • Firebase Remote Config
  • Crash reporting
  • StoreKit & SwiftyStoreKit
  • Docker
  • Nginx

Ship & Distribute

06

Getting it in front of real users

  • App Store Connect
  • App Store review & release
  • IAP & subscriptions
  • Localisation & RTL
  • Versioned updates
  • Git & SourceTree
  • Jira
  • n8n
04Experience

Where I've done the work

Software Engineer (Team Lead)

Tricentric Labs · Faisalabad, Pakistan

CurrentApr 2026 — Present

Leading development on native Apple-platform applications, with the same end-to-end ownership extended across API integration, backend and cloud work, and the full application lifecycle.

  • Lead the development team, setting technical direction and owning delivery across the application development lifecycle.
  • Build native iOS and macOS applications in Swift, SwiftUI, UIKit and AppKit — the primary specialisation carried forward from previous Apple-platform work.
  • Integrate REST and third-party APIs, and take on the backend and cloud-related half of a feature rather than waiting for it to be defined elsewhere.
  • Own each release end to end: architecture, feature development, code review, debugging and shipping.
  • Swift
  • SwiftUI
  • UIKit
  • AppKit
  • REST APIs
  • Backend & Cloud
  • App Store Connect
  • Team Leadership

iOS & macOS Developer

AppLead · Faisalabad, Pakistan

Jan 2025 — Mar 2026

Built and released native applications for iPhone and Mac, owning each one from architecture through to the live App Store listing.

  • Shipped a run of macOS applications to the Mac App Store and kept them updated, running each release end to end in App Store Connect.
  • Built and launched a PDF Editor on the App Store with document scanning, OCR text extraction, PDF editing, signature support and secure locking.
  • Developed cross-platform apps for iOS and macOS — Pro Translator across 100+ languages, a TikTok video downloader and a video-to-audio converter — tuning performance separately for UIKit and AppKit.
  • Integrated REST and LLM APIs, in-app purchases and subscriptions, and Firebase analytics, remote config and crash reporting.
  • Worked the full lifecycle: architecture in MVVM, MVC and Singleton patterns, feature development, debugging, localisation and release management.
  • Swift
  • UIKit
  • SwiftUI
  • AppKit
  • Core Data
  • Realm
  • Alamofire
  • Firebase
  • CocoaPods
  • App Store Connect

BS Software Engineering

National University of Computer & Emerging Sciences · FAST-NUCES

2020 — 2024
05What I can build

Bring me a product, or an app that already exists

Each of these maps to something already shipped — nothing here is aspirational.

Native iOS apps

Swift with UIKit and SwiftUI, built for the platform rather than wrapped from the web.

Native macOS apps

Swift and AppKit — many of them live on the Mac App Store today.

AI-powered features

LLM and OpenAI API integration: chat, code generation, document analysis, summarisation.

Document & media tooling

PDF editing and export, OCR, scanning, and video, image and audio conversion.

API & backend integration

REST integration from the app side, and the Node, Express and MongoDB services behind it.

Purchases & subscriptions

StoreKit in-app purchases, subscription tiers, lifetime unlocks and parental gates.

App Store release management

App Store Connect setup, review, versioned updates and localisation across dozens of languages.

Work on an app you already have

Debugging, performance, and new feature development inside an existing codebase.

06Shipping

Getting it approved is part of the engineering

Writing the app is half of it. The other half is bundle identifiers, entitlements, privacy declarations, subscription products, screenshots, review notes — and the rejection that comes back on a Friday. I've run that loop repeatedly.

  1. 01

    Release setup

    Bundle identifiers, capabilities, entitlements, signing and the App Store Connect record.

  2. 02

    Monetisation

    Subscription and one-time purchase products, restore flows, and parental gates where the age rating requires one.

  3. 03

    Store presence

    Listing copy, screenshots, categories, age ratings and privacy declarations.

  4. 04

    Localisation

    Up to 32 languages in a single release, including full right-to-left layout.

  5. 05

    Review & release

    Submission, review responses, and the rejection that comes back on a Friday afternoon.

  6. 06

    After launch

    Versioned updates, bug-fix releases, crash reporting and analytics on what people actually use.

Release record

Public listings
AppReleasedVersionRequires
Convertio10 May 2026v1.3macOS 14
Chatbot14 May 2026v1.4macOS 14
AI Assistant13 Jun 2026v1.3macOS 15
Kids Learning & Fun Games2 Jul 2026v1.2macOS 14
Browser Manager22 Jul 2026v1.1macOS 13
LabelFlow1 Aug 2026v1.0macOS 12
CV Builder20 Aug 2026v1.1macOS 13
Upworkify28 Aug 2026v1.0macOS 13

A selection of releases, all built during my time at AppLead. Each app is published under its company or client developer account.

07Contact

Have an app to build,
ship, or fix?

Whether it's a new iOS or macOS product, an existing codebase that needs features and bug fixes, or an app sitting in review that needs to get out the door — send me the details and I'll tell you honestly what it would take.

usama.yamaan@gmail.com
Emailusama.yamaan@gmail.com
LinkedInin/usama-yamaan
GitHubmeharyamaan