I build iOS, Android and web apps that ship on time and hold up in production.
Ten years building for iOS and Android — Swift, SwiftUI, Kotlin and Flutter — from architecture and offline-first data through App Store and Play Store submission. Websites and web apps in whatever stack the project needs — React, Next.js, Node, Firebase or plain HTML — and AI and ML features on all of them. I work AI-assisted, with Claude Code, Codex and a DeepSeek harness in the loop. 50+ projects across logistics, healthcare, fintech and productivity.
Swift · SwiftUI · Kotlin · Flutter · Core Data · CloudKit · StoreKit 2 · XCTest · React · Next.js · Node · Firebase · HTML/CSS · LLM APIs · Core ML · Claude Code · Codex · DeepSeek
4.7 ★ average across 9 apps
Harjot Singh Panesar · Mohali- 8+
- 50+
- 50+
- 9
Selected work
All eleven projectsWhat I do
Full service list01
iOS App Development
Native apps in Swift and SwiftUI — Core Data and CloudKit sync, widgets, extensions, push, and App Store submission.
02
Android App Development
Native Kotlin apps, or the Android side of a Flutter codebase — Firebase, push, offline sync and Play Store submission.
03
Website & Web App Development
Sites, landing pages, dashboards and web apps in any stack — React, Next.js, Node, Firebase or plain HTML — built to load fast and rank.
04
Flutter Development
One codebase for iOS and Android with custom UI, Firebase, and BLoC or Provider state management.
05
AI & ML Features
LLM integration and prompt design, AI summaries, ML models and on-device Core ML — with token cost control and caching.
06
Software Architecture
MVVM and Clean Architecture, API and database design, code review, and documentation that outlives the sprint.
07
Monetisation & Subscriptions
StoreKit 2 wired end to end: paywalls, free trials, server-side receipt validation, entitlement sync.
08
QA & Test Engineering
Five years in QA before full-time development. XCTest and XCUITest automation, regression suites, rejection diagnosis.
He delivered our app ahead of schedule and the quality exceeded our expectations. His communication throughout the project was excellent, and he proactively suggested improvements that made the app even better.
Michael R.Founder, HealthTech Startup · via Upwork
We hired Harjot to build a complex Flutter app for our e-commerce business. He understood our requirements perfectly and delivered a polished product.
Sarah T.CEO, E-commerce Company · via Upwork
Outstanding work on our iOS application. Deep technical knowledge, explained clearly. He also optimised our existing codebase, significantly improving performance.
David K.CTO, SaaS Platform · via LinkedIn
Writing
All 19 posts
Common questions
All 15 questions- How long does a mobile app take?
- A simple MVP takes 4–8 weeks, a medium-complexity app 3–6 months, and complex enterprise apps 6–12+ months — including design, development, testing and deployment.
- Will I own the source code?
- Yes. On completion and final payment you receive full ownership of the code and all project assets — the GitHub repository, design files and documentation are transferred to you.
- Do you work with clients outside India?
- Yes — about 70% of clients are international, mainly the US, UK, Australia, Canada and Europe. Slack, Zoom and Jira across time zones, with flexible meeting times.
Have an app or
a site to build?
Tell me what you are building and I will come back with a plan, a timeline and the trade-offs — usually within one business day.
Start a project