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Firmware Development Outsourcing for US Hardware Startups

FreeRTOS, ESP-IDF, and STM32 firmware, written around your actual hardware and tested on your actual board, not built from a generic template and handed back untested.

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Firmware built around your hardware, not a template

  • Real-time firmware on FreeRTOS, ESP-IDF, STM32 HAL, or bare-metal, matched to your product
  • Peripheral drivers, communication stacks, and wireless integration (BLE, Wi-Fi, LoRa)
  • Hardware-in-the-loop testing on your actual board, not just simulation
  • PCB design and mechanical design available from the same team, if you need it
  • Full source code and documentation handed off, no vendor lock-in
Firmware and PCB layout work at CADLETE Designs

Our Firmware Development Process

The same process whether we are writing firmware from scratch or taking over a project already in progress.

01

Codebase & Hardware Review

Your existing hardware and any existing firmware are reviewed before a line of new code is written, so nothing gets rewritten that does not need to be.

02

Architecture & Driver Development

Peripheral drivers, communication stacks, and the real-time task structure are built around your actual hardware, not a generic template.

03

Feature Implementation

Application logic, wireless connectivity, and any cloud or BLE/Wi-Fi integration are built and tested incrementally, not all at once at the end.

04

Hardware-in-the-Loop Testing

Firmware is tested on your real board, not just in simulation, catching timing and peripheral issues before they reach production.

05

Handoff & Documentation

Source code, build instructions, and a written handoff, so your team, or ours, can maintain it going forward.

Where This Firmware Work Applies

The stack changes by product, but the same real-time, hardware-tested discipline applies everywhere.

IoT Products

Connected devices and sensor systems shipped ready to pair.

Consumer Electronics

Smart devices and embedded interfaces built to retail quality.

Industrial Systems

Monitoring and automation hardware built for continuous duty.

Medical Devices

Embedded control and sensing systems, built to a documented process.

Mobility & Automotive

Embedded monitoring and communication hardware for vehicles and fleets.

Smart Infrastructure

Connected control and sensing platforms for buildings and sites.

What US Founders Ask Before Outsourcing Firmware

Do you write firmware for FreeRTOS, ESP-IDF, and bare-metal projects?

Yes. We work across FreeRTOS, ESP-IDF, STM32 HAL, and bare-metal firmware, matched to what your product actually needs rather than defaulting to one stack.

Can you take over firmware on a project that is already in progress?

Yes. We review the existing codebase and hardware first, then scope the handoff so nothing gets rewritten that does not need to be.

Do you also design the PCB, or only write firmware?

Both, if you need it. Firmware, PCB design, and mechanical design are handled by one team, so hardware and firmware decisions get made together, not handed off between vendors.

How do you handle IP and source code ownership?

A non disclosure agreement is signed before any code or design file is shared, and you own the source code and firmware IP on delivery.

Trusted By Product Companies Worldwide

Verified reviews from clients in USA, UK, Germany, Australia, Canada and more.

Javier Campos
14 October 2025
Google

Very good professional, exhaustive and detailed work with great follow-up on the proposed revisions and always willing to make the requested modifications. In addition, a proactive attitude to follow the steps of the project. If you have the opportunity, I recommend working with him, you won't be disappointed.

Verified Google Review
Bells Leonberger
5 October 2025
Google

Working with Cadlete Designs has been a real pleasure. They helped with so many design aspects I hadn't considered and offered many suggestions that I would have never thought of. Professional, prompt, and always willing to go the extra mile. I was extremely lucky to have found them! (Patent Pending)

Verified Google Review
Abdul Haseeb
17 September 2025
Google

Great experience working with Cadlete Designs team, they were professional with quick turnaround times and providing detailed explanations with each iteration. Will work with them again in the future.

Verified Google Review
Fernando Rodriguez
9 September 2025
Google

Working with Smit and the Cadlete Designs team has been amazing. They are extremely diligent, professional, and always willing to go the extra mile. Every detail of our project was handled with care and creativity. Highly recommended!

Verified Google Review
Doughty Build
11 July 2025
Google

These guys are simply the best. They are professional and on time with the orders and take great care in understanding what it is you want done. They offer revisions on the product if it is off and they are so pleasant to work with, I would 10/10 recommend them to anybody looking for designs drawn up.

Verified Google Review
Will YIM
11 July 2025
Google

I had a great experience working with CADLETE Designs. Smit was professional, responsive, and very patient throughout the process. The 3D model was beautifully done and exactly what I needed. Highly recommend their team for any custom design work, they are talented and reliable!

Verified Google Review
Melvin Mathew
2 June 2025
Google

I've worked with CADLETE Design for several years, and every project has been exceptional. Their meticulous attention to detail, quick turnaround times, and consistently professional, helpful, and kind service make them a standout partner.

Verified Google Review
Okan Anter
26 May 2025
Google

I have been getting a ton of design work done. Engineered specs, renderings for the past 3 years with them. The best thing about them is that they come back quickly and with great work quality. I really appreciate all the work they done for us and continue to do.

Verified Google Review
Aaron Ellison
26 May 2025
Google

Cadlete Designs staff are very professional and will go above and beyond to build and deliver a great product! They built my custom mechanics creeper board for my company and I have nothing but the utmost respect for this company. Special recognition to Smit!

Verified Google Review
Steven Smith
26 May 2025
Google

I've been collaborating with CADLETE Design for several years, and it's been a truly great experience. Their attention to the specific details of each project is outstanding. Deliveries are always fast, and they are consistently helpful, professional, and kind.

Verified Google Review
Javier Campos
14 October 2025
Google

Very good professional, exhaustive and detailed work with great follow-up on the proposed revisions and always willing to make the requested modifications. In addition, a proactive attitude to follow the steps of the project. If you have the opportunity, I recommend working with him, you won't be disappointed.

Verified Google Review
Bells Leonberger
5 October 2025
Google

Working with Cadlete Designs has been a real pleasure. They helped with so many design aspects I hadn't considered and offered many suggestions that I would have never thought of. Professional, prompt, and always willing to go the extra mile. I was extremely lucky to have found them! (Patent Pending)

Verified Google Review
Abdul Haseeb
17 September 2025
Google

Great experience working with Cadlete Designs team, they were professional with quick turnaround times and providing detailed explanations with each iteration. Will work with them again in the future.

Verified Google Review
Fernando Rodriguez
9 September 2025
Google

Working with Smit and the Cadlete Designs team has been amazing. They are extremely diligent, professional, and always willing to go the extra mile. Every detail of our project was handled with care and creativity. Highly recommended!

Verified Google Review
Doughty Build
11 July 2025
Google

These guys are simply the best. They are professional and on time with the orders and take great care in understanding what it is you want done. They offer revisions on the product if it is off and they are so pleasant to work with, I would 10/10 recommend them to anybody looking for designs drawn up.

Verified Google Review
Will YIM
11 July 2025
Google

I had a great experience working with CADLETE Designs. Smit was professional, responsive, and very patient throughout the process. The 3D model was beautifully done and exactly what I needed. Highly recommend their team for any custom design work, they are talented and reliable!

Verified Google Review
Melvin Mathew
2 June 2025
Google

I've worked with CADLETE Design for several years, and every project has been exceptional. Their meticulous attention to detail, quick turnaround times, and consistently professional, helpful, and kind service make them a standout partner.

Verified Google Review
Okan Anter
26 May 2025
Google

I have been getting a ton of design work done. Engineered specs, renderings for the past 3 years with them. The best thing about them is that they come back quickly and with great work quality. I really appreciate all the work they done for us and continue to do.

Verified Google Review
Aaron Ellison
26 May 2025
Google

Cadlete Designs staff are very professional and will go above and beyond to build and deliver a great product! They built my custom mechanics creeper board for my company and I have nothing but the utmost respect for this company. Special recognition to Smit!

Verified Google Review
Steven Smith
26 May 2025
Google

I've been collaborating with CADLETE Design for several years, and it's been a truly great experience. Their attention to the specific details of each project is outstanding. Deliveries are always fast, and they are consistently helpful, professional, and kind.

Verified Google Review

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