Senior React Native Engineer — Agency Partnerships
White-Label React Native Execution for Web Studios & Software Houses
Senior-level application engineering plugged directly into your existing development pipelines. Scale your agency’s capabilities without adding to your permanent headcount.
The Delivery Layer Behind Your Brand
I work entirely inside your repository and your process. Your clients only see your brand, your project managers, and your communication. I deliver clean, documented code on your timeline.
The mobile trap for web-focused teams
You Master the Web Layer. Your Clients Want Mobile.
You build enterprise .NET architectures, high-scale Drupal engines, or headless web stacks. Your backend is bulletproof. But the moment an established client demands a companion iOS and Android application, you hit an operational wall.
Whether you currently have zero mobile capacity or you are managing a fragile, makeshift mobile setup, the bottlenecks remain identical:
01
Headcount Liability & Fragility
Hiring a permanent, full-time senior mobile engineer introduces massive fixed overhead during pipeline shifts. On the other flip, relying on a single, isolated freelancer creates a dangerous single point of failure. Your client delivery stalls the exact moment they get sick, hit a capacity ceiling, or ghost your team.
02
The Full-Stack Stretch Gamble
Passing the track to unverified marketplace freelancers or tasking a backend web developer with cross-platform mobile compilation yields the same result: sluggish, unoptimized hybrid builds. High memory bloat and frame drops instantly damage your hard-earned agency reputation.
03
The Revenue Leak
Signposting legacy clients to external mobile shops means leaving lucrative, long-term contracts on the table. You miss out on highly predictable recurring monthly revenue simply because you lack an elite, scalable mobile execution layer sitting on your bench.
The Process
How I Integrate Into Your Agency.
01
Engineering & Architecture Alignment
I do not write isolated, unmaintainable framework wrappers. My mobile builds are engineered to match the rigorous standards of your existing enterprise web layers.
State & Performance Architecture
Built entirely on strict TypeScript. I implement predictable, production-grade state management patterns using Zustand or Redux Toolkit, paired with native navigation profiling to keep views fast.
Robust API & Integration Layer
Architected specifically to consume your complex backend REST or GraphQL endpoints. Builds include strict type-safety, resilient error-handling thresholds, intelligent offline caching, and silent payload synchronization.
Production Telemetry
Every track comes pre-configured with industry-standard monitoring tools like Sentry or PostHog. Your technical director gets real-time visibility into app health, performance vitals, and interaction latency metrics from day one.
02
The Silent Partner Blueprint
The biggest risk with external contractors is operational friction. I operate invisibly behind your agency brand, protecting your internal velocity and client trust.
Repository Hygiene & Git Etiquette
I adapt to your infrastructure. I branch directly off your staging or feature tracks, adhere strictly to your internal linting and styling configurations, and submit clean, atomic pull requests for your team to review.
Invisible Communication Boundaries
I sit directly inside your Slack, Microsoft Teams, or Jira ecosystems under a dedicated agency profile. I provide high-density asynchronous daily updates so your project managers remain fully in control of the client narrative.
White-Label Security
Complete operational compliance is locked down before a single repository link is shared. Total data security is guaranteed through comprehensive NDAs and clean intellectual property assignment clauses.
Selected work
Two live apps. Both downloadable right now.
iOS + Android · 100K+ downloads
Nexiun
AI-powered social platform — iOS + Android, 100K+ downloads
100K+
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.
Deep-Dive Engineering Case Study
450ms to 90ms Chat Optimization
450ms
Before
90ms
After
−80%
Latency
Third-party chat SDKs (like CometChat) work well out of the box, but naive implementations introduce massive overhead as user histories grow — causing UI frame drops, navigation jank, and JavaScript thread saturation.
On a recent project deployment, I rearchitected the real-time chat data pipeline to drop screen mount-to-idle times below the human perception threshold, bringing loading latency from 450ms down to 90ms.
The Strategy
- ✓Latency Hiding via Navigation Hooks: Hooked into the navigation transition window to trigger message prefetching 200–400ms before the chat screen component explicitly mounts.
- ✓Progressive 2-Stage Hydration: Leveraged cached conversation metadata to instantly render the latest 5 messages (immediate visual layout), while executing asynchronous background queries for the remaining history.
- ✓Bounded Object Allocation: Capped initial conversation arrays and message arrays to strict limits (20/15) to prevent massive JSON payloads from saturating the JavaScript memory heap.
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 owned the React Native architecture on Nexiun end to end, performance, native modules, AI integration, and shipped it to 100K+ downloads across iOS and Android. He thinks like a product engineer, not just a coder: the kind you don't have to manage closely because he raises the right questions before you'd have to ask.”
Nexiun Platforms
Founder · Nexiun
“I can't express how helpful Hassan was on this project. Communicative, available, and the quality of work was unmatched.”
Harmoniq
Founder · Harmoniq Music
“Strong ownership and a real focus on delivering results. I'd recommend Hassan to anyone building a product.”
SplitTrip
Founder · SplitTrip
Engagement tracks
Three Ways to Work Together.
Track 1
The Performance & Conversion Audit
Designed for: Teams inheriting an unstable mobile codebase or facing an active App Store rejection.
The Goal
Protect your client relationship by identifying exactly why an application is dropping frames, leaking users, or failing store compliance checks.
The Triage
A code-level architecture teardown pinpointing memory leaks, unoptimized rendering lists, and database bottlenecks.
The Deliverable
You receive a prioritized technical fix-list and a screen-recorded video walkthrough detailing every required optimization.
The Business Payoff
Your team gets an immediate blueprint to stabilize the application and save the account, with zero obligation to sign a long-term engineering contract.
Track 2 · 10 to 20 hours per week
The Portfolio Retainer
Designed for: Agencies managing live client applications that require continuous care and platform compliance.
The Goal
Keep your internal core engineering team focused entirely on high-margin web sprints while your legacy mobile ecosystem runs quietly.
The Integration
Your project managers drop mobile support tickets, layout tweaks, or platform version updates directly into your existing project management tool.
The Execution
I resolve tasks systematically every single week under your white-label brand, completely removing emergency mobile fire drills from your day.
The Business Payoff
You convert unpredictable mobile bugs into a predictable monthly operational expense that you can cleanly mark up and bill back to your clients.
Track 3 · 30 to 40 hours per week
The Dedicated Pipeline
Designed for: Active greenfield application builds, intense launch sprints, or high-stakes app rescue missions.
The Goal
Hit strict application launch deadlines and confidently bid for enterprise cross-platform mobile projects without adding permanent headcount liability.
The Scope
End-to-end mobile engineering execution covering robust state architecture, custom native module bridging, and real-time data synchronization.
The Workflow
A dedicated senior React Native developer integrates straight into your active sprint cycles overnight, matching your exact git workflows and internal communication patterns.
The Business Payoff
You gain the execution velocity and market capacity of a full-scale mobile division sitting safely on your bench, ready to scale down cleanly as soon as the project goes live.
Every engagement begins with a two-week trial sprint. If the initial code is not operational and approved by your technical director, you do not sign off on the work.
Production performance benchmarks
Verifiable Production Numbers.
Every line of code is optimized for raw performance and user retention, backed by verifiable production metrics:
+65%
Signup Conversion
Lifted onboarding signup rate from 25% to 65% through targeted UX friction reduction.
396MB
RAM After Optimisation
Slashed runtime memory from 1,570MB — restored a smooth 60fps on older devices.
90ms
Chat Load Time
Reduced from 450ms via re-engineered real-time data fetching patterns.
Memory Stabilisation — Harmoniq Music
Verified Xcode Instruments data. Same screen, same device, same user flow — restructured runtime state handling only.
−75%
RAM reduction
Before
1,570MB
RAM · ~3fps
After
396MB
RAM · 60fps
Harmoniq Music — iOS. Verified via Xcode Instruments. Single React Native codebase. No native rewrites.
Operational certainty
Built for Agency Operations.
01
Transparent Location
Operating out of Bahawalpur, Pakistan and available to work in your timezone for frictionless collaboration.
02
Zero Juggling
I deliberately cap active agency engagements to ensure your project receives dedicated, uninterrupted focus.
03
Risk-Free Testing
Every engagement begins with a two-week trial sprint. If the initial code is not operational, documented, and approved by your technical director, you do not sign off on the work.
Frequently Asked Questions
Common Questions, Direct Answers.
Q01
What happens if our mobile pipeline completely dries up next month?
Answer
You face zero permanent bench liability. My rolling monthly contracts require a straightforward 30-day notice period to pause, scale down, or transition from a dedicated 40-hour pipeline to a light portfolio maintenance track. You only pay for active execution capacity.
Q02
We already have a web developer who handles mobile requests. Why do we need you?
Answer
Keep your core developers focused on high-margin web delivery. Tasking web engineers with mobile store deployments or native performance debugging slows down your entire pipeline. Use me as an overflow valve when internal capacity fills up, or as a specialist to handle high-end rendering optimizations.
Q03
Who owns the intellectual property and application code?
Answer
Your agency does. Upon code commit and automated merge, 100% of the intellectual property, repository assets, code documentation, and application store signing certificates transfer legally and exclusively to your company.
Q04
How do we handle the geographic setup and daily collaboration?
Answer
I work in your timezone. This structure allows your team to run standard morning alignment sessions, sync live during critical sprint milestones, and receive fully compiled TestFlight or Google Play builds before closing out their day.