Let’s be honest — IoT isn’t simply sensors, firmware, or connectivity anymore. It’s ecosystem building. When you release a smart device these days, it’s supposed to interwork between platforms, integrate with apps, push data to the cloud, and maybe even trigger automation through third-party services. And how is all this accomplished?
Through robust APIs and SDKs.
If you’re building or scaling an IoT solution, choosing a development partner who understands this layer, the communication bridge between your hardware and the rest of the world, is absolutely critical. That’s why we’ve curated a list of the top IoT product development companies that don’t just build devices but deliver strong API & SDK support to ensure long-term scalability, integration ease, and user control.
If you’re searching for a future-tight partner with comprehensive IoT product development engineering, Yalantis is the one to follow, putting embedded systems, cloud infrastructure, and impeccable API design under one roof.
What Makes API & SDK Support a Big Deal in IoT?
APIs (Application Programming Interfaces) and SDKs (Software Development Kits) are what make your IoT device communicate, connect, and scale. They allow developers to integrate your product into their apps. They also let your mobile dashboard control your smart device. And they help your firmware update automatically without manual installs.
In short, APIs and SDKs make your product usable and flexible, not just functional.
And these aren’t just tools for developers. A well-structured API or SDK means:
- Launch your apps faster
- Simplified onboarding for third-party partners
- Better debugging and maintenance
- Seamless user experience across platforms
With that in mind, let’s look at the firms doing it best.
Leading Companies in IoT Development with Robust API & SDK Support
These companies offer more than just code. They offer reliability, transparency, and engineering that hold up in the real world.
Yalantis
When it comes to full-spectrum IoT development, Yalantis checks every box. From device firmware and edge software to cloud dashboards and mobile interfaces, they build the entire stack with integration in mind.
What really sets them apart is their API-first approach. Their developers ensure that everything — whether it’s a wearable sensor or an industrial gateway — is built with clean, scalable APIs and client-ready SDKs.
Services they offer:
- Custom SDK development for mobile apps and device control
- Secure APIs for real-time device-to-cloud communication
- Remote diagnostics and OTA firmware updates
- Expertise in protocols like BLE, LoRaWAN, Zigbee, and MQTT
Whether you’re developing a smart thermostat or a hospital-grade monitoring device, Yalantis delivers clean architecture and scalable integrations, along with reliable communication, documentation, and support.
Why clients love them: Clear processes, business-focused thinking, and long-term partnerships.
N-iX
N-iX is an experienced tech ally for businesses requiring profound engineering strength. Their IoT team creates firmware right through to full analytics platforms, frequently crossing manufacturing, automotive, and smart agriculture.
What distinguishes them as a solid API/SDK partner is that they have a cloud-native approach. Their offerings are designed with Azure IoT, AWS, and GCP as a first consideration, so integration with next-generation enterprise stacks is effortless.
Their strengths:
- Modular SDKs for scalable deployments
- Secure device onboarding APIs
- Real-time monitoring dashboards
- Compliance with GDPR and ISO standards
If you’re looking for a firm that can balance compliance, complexity, and connectivity, N-iX is worth a conversation.
Softeq
Softeq is the team behind some of the world’s most advanced embedded systems — including those used in wearables, electric vehicles, and consumer electronics.
They bring firmware and cloud platforms together through well-structured SDKs and APIs. Their team often builds low-level drivers, real-time OS firmware, and mobile apps that talk to each other through secure cloud pipelines.
Notable services:
- Device firmware SDKs
- Cloud control APIs and analytics engines
- AI-enabled edge computing
- BLE and cellular device stacks
Their approach is ideal for companies building high-performance IoT devices where precision, latency, and uptime matter.
Telit Cinterion
Telit Cinterion is more than a software company — they’re also a hardware provider, offering pre-certified modules and SIM management services. But they’ve also built an impressive layer of IoT PaaS tools like OneEdge and deviceWISE.
Their SDKs are plug-and-play with Telit hardware, allowing developers to build quickly without reinventing basic protocols.
Highlights:
- Full suite of connectivity APIs
- SDKs for 5G, NB-IoT, and LTE-M devices
- Device lifecycle tools with provisioning and firmware management
- Built-in security and OTA support
If your IoT journey starts with Telit modules, you’ll benefit from their seamless SDK stack and solid documentation.
Digi International
A veteran in the embedded hardware space, Digi is behind many of the devices that power smart cities, industrial systems, and medical equipment.
They offer SOMs (System on Modules), gateways, and mesh-networking components, all paired with SDKs that simplify integration for your development team.
What makes Digi great:
- Multi-language SDK support (Python, Java, C, MicroPython)
- Digi Remote Manager for centralized control
- SDKs for Zigbee, LTE, and Wi-Fi stacks
- Rich developer resources and community support
For projects that require fast prototyping and strong hardware support, Digi delivers.
Intuz
Intuz stands as your top choice when you need to transform your concept into a prototype quickly. The company provides fast development cycles to help startups and SMEs create Proof of Concepts and scalable Minimum Viable Products.
Their API and SDK services are tailored to support everything from smart homes to fleet monitoring systems.
Where they shine:
- Lightweight SDKs for wearables and mobile apps
- MQTT and BLE integrations
- Real-time monitoring dashboards with REST APIs
- Affordable and flexible engagement models
Intuz is a good match for teams with limited resources but big ideas.
Indeema Software
Indeema takes a collaborative approach to IoT, with clear processes and dedicated teams. Their strength lies in building cloud-native platforms that scale easily, while also supporting secure device connectivity.
They often work in energy, manufacturing, and health tech, delivering both embedded software and external-facing APIs.
What they offer:
- Custom SDKs for device pairing and cloud sync
- Secure RESTful APIs for admin portals.
- Firmware with edge AI and ML support
- AWS IoT Core and Azure integration
Their balanced capabilities make them a safe choice for mid-size and enterprise projects alike.
WebbyLab
WebbyLab offers a strong technical foundation with a flexible, client-centric approach. They’ve developed for connected car platforms, smart lighting systems, and consumer devices — all of which demand accurate firmware, friendly apps, and stable APIs.
Their SDKs provide client teams with an easy way to develop on top of established infrastructures, allowing flexibility without the loss of control.
Best known for:
- SDKs for device discovery and remote control
- API layers for analytics and reporting
- Web and mobile dashboards with real-time status updates
- High testing standards and CI/CD integration
WebbyLab is an excellent choice if you want quality and speed.
Final Thoughts
The world of IoT is expanding quickly, and many development partners cannot keep abreast of today’s integration requirements of connected products. APIs and SDKs are no longer backend features, they’re the lifeblood of your product’s usability and long-term success.
If you’re in need of a team providing future-proof, end-to-end IoT product development engineering, then Yalantis is where you should start. Their API-first approach, transparent communication, and scalable engineering make them an excellent partner from prototype to post-launch.
The list provides you with the best partners in the business for developing your first connected device or expanding an existing ecosystem.