What software does an IoT product need?

Three coordinated layers: firmware running on the microcontroller inside the device, a mobile app that serves as the user interface, and a cloud backend handling accounts, data collection, remote control, and analytics. All three must be designed together with the hardware — the choice of chip and radio determines what the software can do.

How much does the cloud infrastructure for a connected product cost?

With managed IoT platforms, early-stage costs are usually modest — often tens to a few hundred dollars per month for a small fleet — and scale with device count and data volume. The bigger budget items are the engineering of the backend itself and ongoing operations; designing efficient data flows early keeps the monthly bill from growing faster than revenue.

What are OTA updates and why are they essential?

Over-the-air updates let you push new firmware to devices in the field: fixing bugs without a recall, closing security holes fast, and adding features over the product's life. The mechanism must include fail-safe recovery so a failed update can never permanently disable a customer's device — which is why OTA has to be architected in from day one.

Should processing happen on the device or in the cloud?

Three practical rules: anything safety-critical lives in firmware, always; heavy computation belongs in the cloud or the app, not on a small microcontroller; and logic that will change frequently should stay out of firmware because field updates are harder than server deployments. Edge AI shifts some intelligence back onto the device when latency or privacy demands it.

What security standards apply to connected products?

Expect requirements for encrypted communications, secure key storage, unique per-device passwords, and a mechanism for security updates across the product's lifetime. In the US, the FCC's Cyber Trust Mark program signals the direction for consumer IoT, and the FDA sets cybersecurity expectations for connected medical devices. Retailers and enterprise buyers increasingly audit for these too.

How is software development for a product different from ordinary app development?

Product software spans firmware, app, and cloud that must behave as one system, under hardware constraints — limited memory, battery budgets, unreliable connectivity — plus manufacturing concerns like device provisioning and fleet management. It demands engineers who work at the hardware boundary, not just web and mobile skills.

Custom Software Development for Products — IoT Cloud, Backend, and Device Software

The Production Line Is Just the Beginning

A product used to be finished when it rolled off the line. Today, for most new products, shipping is where the software story starts: customers expect to connect the device to their phone, see data in the cloud, receive automatic updates, and increasingly get intelligent insights on top. A connected product is really three software systems that must work as one: firmware on the device, an app in the user's pocket, and a cloud backend tying them together. This guide explains custom software development for physical products — and why the software must be engineered together with the hardware, not after it.

One System, Three Layers

Firmware — the code running on the microcontroller inside the product. It reads sensors, drives motors and displays, manages power and battery, and talks to the outside world. Good firmware is written hand in hand with the electronics design: the choice of MCU, sensors, and radio determines what the software can do — and what the bill of materials costs. We cover this discipline in depth on our embedded software development page.

The app — the face of the product. Cross-platform frameworks like Flutter and React Native let one codebase serve both iOS and Android at the cost and schedule of a single build. For most connected products that is the right call, with separate native development reserved for unusual performance demands. See our dedicated guide to app development for the full picture.

The cloud backend — the machinery behind the scenes: user accounts and permissions, data collection from devices in the field, remote control, analytics, and dashboards. Today's managed IoT platforms on AWS, Azure, and Google Cloud provide ready-made, secure infrastructure for connecting thousands of devices — so your budget goes into the logic that is unique to your product, not into reinventing plumbing.

How Does the Product Talk? Choosing the Communication Channel

One of the earliest and most consequential decisions in connected-product engineering:

Bluetooth Low Energy (BLE) — king of personal devices: tiny power draw and a direct link to the smartphone. Perfect for wearables, health devices, and home gadgets. Trade-off: short range and dependence on the phone as the bridge to the cloud.
Wi-Fi — right for plugged-in home products that need high data rates or a direct cloud connection. Uses more energy and requires a network-onboarding flow that must be genuinely smooth for ordinary users.
Cellular (LTE-M / NB-IoT) — for products that operate in the field with no phone and no home network: asset tracking, agriculture, industrial monitoring. Adds component cost and a monthly data fee — a factor that belongs in the business model, not just the schematic.

The choice affects component cost, battery life, user experience, and recurring revenue — which makes it a combined engineering and business decision, never a technical footnote.

OTA Updates: The Product Keeps Improving After the Sale

Over-the-air update capability is no longer a luxury — it is table stakes. It lets you fix firmware bugs without recalling units from the field, close security vulnerabilities the moment they surface, and ship new features that grow the product's value over time. An OTA system must be designed in from day one — including a fail-safe recovery mechanism that guarantees a failed update can never brick devices sitting in customers' homes.

AI in the Cloud and on the Device

Connected products are fertile ground for AI: detecting usage patterns, predicting failures before they happen, personalizing behavior, and enabling natural voice interfaces. Some of that intelligence runs in the cloud, but a major trend is Edge AI — compact models (TinyML) running directly on the product's microcontroller: motion, sound, or anomaly recognition in real time, with no network dependency and no sensitive data leaving the device. Done right, AI can move a good product into a category of its own — but it requires co-designing hardware (compute, memory) and software from the specification stage.

Cybersecurity: A Regulatory Requirement, Not a Suggestion

The "connect it and see" era is over. Regulators and retail channels increasingly expect connected products to meet real security standards — encrypted communications, secure key storage, a security-update mechanism for the product's lifetime, and unique per-device credentials (no more admin/admin). In the US, the FCC's Cyber Trust Mark labeling program signals this direction for consumer IoT, and FDA expectations apply to connected medical devices. A product not designed for security can simply be locked out of entire markets. Security is cheap when built in, and painfully expensive when bolted on.

How It Works at Projects House

Whole-system specification. We define the complete user experience together: what happens on the device, in the app, and in the cloud — and choose the architecture and communication channel to match the budget and business model.
Integrated hardware–software design. The electronics, mechanical, and software teams work in parallel: the MCU and radio are chosen for the planned software, and vice versa.
Iterative development. Firmware, app, and backend evolve in short cycles on real prototypes, with early and frequent integration testing.
Security and compliance. Encryption, key management, OTA infrastructure, and testing aligned with the requirements of your target markets.
Launch and ongoing operations. App-store publication, cloud operations, fleet monitoring, and continuous updates — the product keeps getting better after the sale.

The Bottom Line

In a connected product, software is not an add-on — it is half the product. Firmware, app, and cloud must be engineered as one system, together with the electronics and mechanics, with connectivity, OTA updates, AI capability, and security designed in from the start. As part of a complete new product development process, Projects House puts all of these disciplines under one roof — so your product works as a single coherent system, from the sensor to the screen.

Building a smart, connected product? Tell us about it through our contact form — and let's engineer the complete system together: hardware, software, and cloud.

Software Development for Connected Products: Firmware, Cloud, and Everything Between