I will build a mobile app for your iot or connected device


About this gig
I'm Timo, founder of merkaio. I build mobile apps that talk to real hardware,
not just to an API.
Most app developers stop at the cloud. With IoT, the hard part starts exactly
there: connecting to the device itself, in the field, often without internet.
What I build:
- BLE & NFC provisioning: scan a QR code, connect via Bluetooth, configure your
sensor on site. No internet needed.
- Real-time data: live sensor values via MQTT or WebSocket, not pull-to-refresh.
- Push alerts: critical alarms that reliably reach the lock screen.
- Offline-first: technician and field-service apps that work without a signal and
sync later.
- White-label: your branding, your app, your customers.
One codebase, both platforms: React Native for iOS and Android at once.
I don't just hand over code. I handle the full release: Apple/Google signing,
store assets and the review process, so your app actually gets approved.
Typical stack: React Native, react-native-ble-plx, MQTT.js, offline sync.
You work directly with the engineer who builds it. You own the source code.
Message me before ordering so we can scope it properly. Visit merkaio.com!
Get to know Timo Wevelsiep
Production Ready IoT and IIoT Platforms: Built, Deployed and Operated
- FromGermany
- Member sinceOct 2019
- Avg. response time1 hour
- Last delivery1 year
Languages
English, German, Dutch, Spanish, French, Italian
My Portfolio
FAQ
Should I contact you before ordering?
Yes. IoT apps vary a lot in scope, especially around hardware. A short call confirms the right package, timeline and price. For Standard or Premium I send a custom offer.
Can the app connect to my device via Bluetooth (BLE)?
Yes. BLE is a core part of what I do, pairing, configuration and live data from your device, using react-native-ble-plx.
Does the app talk to the hardware directly or via the cloud?
Both are possible. Direct via BLE/NFC for on-site setup without internet, or via the cloud (MQTT/REST) for remote monitoring. Often a combination of both.
Can it work offline?
Yes. I build offline-first apps for technicians in the field, they work without a signal and sync once back online.
Why React Native instead of native Swift/Kotlin?
One codebase for iOS and Android, faster delivery, lower maintenance, native performance for IoT use cases. I can do fully native where a project truly needs it.
Do you handle the App Store / Play Store release?
Yes. Signing, store assets and the review process are included, your app gets published, not just handed over as code.
Do I own the source code?
Yes. You receive the full source code and repository. No vendor lock-in.
Can you also build the platform or dashboard behind the app?
Yes, that's a separate gig (custom IoT platform & dashboard). Together they cover your full stack, device to app to platform.
102 reviews for this Gig
| (101) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
Sort By
J 
johnpccd

Germany
Timo and Robin provided detailed and prompt consultation on cloud architecture related topics and went above and beyond to help me meet my requirements and save costs.
Up to $50
Price
1 day
Duration
Helpful?R 
razvanteodorisp
Repeat Client

Romania
timo is just an amazing guy, he helped us save around $1000 per month in unused server resources, and everything is running a lot faster now. we also had some database issues which he fixed incredibly fast. i will definitely work with him on all of my future projects, 5/5 stars!!
$400-$600
Price
6 days
Duration
Helpful?D dnlnrx
Repeat Client

Germany
Wie immer, perfekte schnelle und zuverlässige Leistung. Absoluter Profi!
Helpful?D 
davidwebb836
Repeat Client

United States
Amazing work and great communication
Helpful?B 
babasanfoor
Repeat Client

Israel
Great seller Honest on top of all Great communication and great delivery Listens to issues that come up and there when you need him! My 3rd order, and Will order again
Helpful?
102 reviews for this Gig
| (101) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
Sort By
J 
johnpccd

Germany
Timo and Robin provided detailed and prompt consultation on cloud architecture related topics and went above and beyond to help me meet my requirements and save costs.
Up to $50
Price
1 day
Duration
Helpful?R 
razvanteodorisp
Repeat Client

Romania
timo is just an amazing guy, he helped us save around $1000 per month in unused server resources, and everything is running a lot faster now. we also had some database issues which he fixed incredibly fast. i will definitely work with him on all of my future projects, 5/5 stars!!
$400-$600
Price
6 days
Duration
Helpful?D dnlnrx
Repeat Client

Germany
Wie immer, perfekte schnelle und zuverlässige Leistung. Absoluter Profi!
Helpful?D 
davidwebb836
Repeat Client

United States
Amazing work and great communication
Helpful?B 
babasanfoor
Repeat Client

Israel
Great seller Honest on top of all Great communication and great delivery Listens to issues that come up and there when you need him! My 3rd order, and Will order again
Helpful?

