Senior React Native Engineer — Available for Q3 agency projects
White-label React Native delivery for digital agencies.
I work behind your client communication. Your brand stays on every artifact. Senior-level code, clean handoffs, NDA-friendly.
How I work with agencies
When you land mobile work but don’t have React Native capacity in-house, I become the delivery layer behind your agency. Your client sees your brand, your project manager, your communication — they don’t need to know I exist unless you want them to. I deliver to your specs, on your timeline, in your codebase if you have one or in a fresh one you hand over.
Most engagements run 4–8 weeks. I work on one agency project at a time — no juggling, no slipping deadlines because three other clients are competing for my attention.
Why this works
Experience
Six years of React Native — from when it was experimental to when it became the default for cross-platform mobile. Senior role at a European product company. I’ve shipped to App Store and Play Store more times than I’ve counted.
Verifiable work
Recent independent client: Harmoniq Music. Live on iOS, US client, public review on my Upwork profile if you want to verify before you reply. Also currently working on Nexiun at my employer — 60k+ downloads across iOS and Android.
View Upwork profile →Operational maturity
I’m based in Pakistan and completely transparent about it — no “Atlanta-based” fronts, no surprise outsourcing. The trade for you: US RN agencies charge $150–200/hr. I charge $60–75. Same code quality, lower overhead, complete transparency about where the work happens.
Selected work
Two live apps. Both downloadable right now.
iOS + Android · 60k+ downloads
Nexiun
AI-powered social platform — iOS + Android, 60k+ downloads
60K+
downloads
Built at my current employer. A full social product with AI image generation, real-time chat, geolocation, and a feed experience. Single React Native codebase, native modules where performance demanded it. Live on both stores.
iOS · US client · Live since 2023
Harmoniq Music
Music social platform — independent client, US-based, live since 2023
4.9★
App Store rating
Built independently for a US client. Connects to Apple Music and Spotify, lets users share songs and playlists with comments and discovery. Multiple major updates including iOS 18 redesign and dark mode. Still active and maintained.
What clients say
“Hassan is the senior engineer you want on your hardest mobile project. He owned the React Native architecture on Nexiun end-to-end — performance, native modules, AI integration — and shipped it to 60k+ downloads across iOS and Android. He thinks like a product engineer, not just a coder. The kind of engineer you don't have to manage closely because he raises the right questions before you'd have to ask them.”
Nexiun Platforms
Founder · Nexiun
“I can't express how helpful Hassan was on this project. He was communicative, available, and the quality of work was unmatched.”
Harmoniq
Founder · Harmoniq Music
“Excellent team player with strong 'deliver results' and 'ownership' skills. I recommend Hassan to anyone looking for front-end development and a contributing team member.”
SplitTrip
Founder · SplitTrip
The offer
Option A
Pilot engagement
If we haven’t worked together before
A defined, 40–60 hour engagement with one specific deliverable agreed in writing. You get to see how I work without committing to a full project. Most pilots become longer relationships; some don’t, and that’s fine.
Investment
$3,500 fixed
Timeline
2–3 weeks from scope sign-off
What’s included
- ✓One defined deliverable (a feature, refactor, or module)
- ✓Working code merged into your or your client’s repo
- ✓Written summary of decisions and architecture
- ✓Satisfaction clause: if I haven’t delivered something meaningful in 2 weeks, you pay 50% and we part cleanly
Option B
Full project engagement
Once we’ve established fit
Standard agency project structure: scoped in writing upfront, fixed price, milestone payments. I work alongside your team or behind your client communication, whichever you prefer.
Investment
$12,000–$18,000 fixed
or $60–75/hr if you prefer time and materials
Timeline
4–8 weeks typical
What’s included
- ✓Code in your or your client’s GitHub from day one
- ✓Weekly TestFlight + Play Console builds
- ✓Documented, structured, maintainable code
- ✓App Store + Play Store submission handling
- ✓30-day post-launch bug warranty
I take 2–3 agency engagements per quarter alongside my day job. Currently booking Q3.
How the engagement is structured
These aren’t policies buried in a contract. They’re how I work by default.
Your code, in your GitHub, from day one
Not in mine, not held hostage, not delivered as a zip file at the end. Every commit pushes to your repo from the first day of work. If you need to bring in another developer tomorrow, the code is already yours and already accessible.
Weekly working builds, not Figma files
Every Friday you get a real TestFlight build to test on your actual phone. Not mockups, not clickable prototypes, not “looks great in design.” Working code, in your hand, every week. If progress slips, you see it the same week — not after three months of demos that turn out to be screenshots.
Documented, structured, maintainable code
Your next developer should be able to add a feature in days, not weeks. I write tests, document the architecture, and follow standard React Native patterns. No “genius spaghetti” that only I can understand. If you ever stop working with me, the handoff should take an afternoon, not a rebuild.
Fixed scope, fixed price
We agree the scope upfront in a written spec you sign off on. Out-of-scope additions are quoted separately before any work starts. Nothing gets added silently and billed later.
Milestone payments — not 100% upfront
50% at scope sign-off. 50% at first store submission. You don’t pay in full before seeing a working app. If something is fundamentally wrong at the first milestone, you can walk.
30-day bug warranty
Anything broken after launch, I fix it. No debate, no separate invoice, no “that’s out of scope.” The 30 days starts the day the app goes live in both stores.
What happens after launch
Mobile apps need ongoing work — OS updates, library patches, small features. After the 30-day warranty, I offer optional monthly retainers: $500/month for 5 hours, $900/month for 10 hours. Month-to-month, cancel anytime. If your agency prefers to handle maintenance internally or pass it to another developer, the documented codebase makes the handoff straightforward.
About
I’m Hassan, a senior React Native engineer based in Bahawalpur, Pakistan. I’ll tell you that on the first call, on the contract, and in every email — no location games, no “Atlanta-based” fronts, no surprise outsourcing.
Six years in React Native — from when it was experimental to when it became the default choice for cross-platform mobile. Currently senior RN engineer at a European product company; on the side, I take a small number of independent agency engagements per quarter.
My overlap with UK business hours is 11 AM–7 PM GMT; with Australian hours, 12 PM–7 PM AEST. Mobile-only — no web work, no design services, no “full-stack everything.”
Get in touch
Got a mobile project on your plate?
15 minutes is enough to know if it’s a fit. No pitch, no follow-up spam.
hassan@hassanmobile.com · Working with agencies in the UK, Australia, and Europe