Hakan Sevimoğlu Hakan SevimoğluFreelance Developer · 18 yrs
PCB · Firmware · App

Electronic Product Development: From Idea to a Device Ready for Mass Production

Not just software: I develop production-ready products where the circuit board, embedded firmware, mobile app and cloud dashboard work together.

Quick answerElectronic product development means designing a device's schematic and PCB, building prototypes, and developing its embedded software (firmware) together with the connected mobile/web app, then preparing it all for mass production. Hakan Sevimoğlu develops hardware and software end to end and has built products such as DNC Box, vending machine control, smart irrigation and a smart mirror.

Written by Hakan Sevimoğlu · Last updated:

Why hardware and software from one developer?

When one company designs the circuit board, someone else writes the firmware and a third team builds the mobile app, arguments over whether a fault lies in the hardware or the software can delay a project for months. With end-to-end development, every decision, from pin assignments to the API contract, is made within the same architecture.

The result: fewer revisions, faster prototypes and products that can be safely updated in the field (OTA).

The development process

The process runs in six steps: idea and architecture, circuit and PCB design, prototype, firmware, app and cloud, and preparation for mass production. Each step ends with a working deliverable, and we move on to the next with your approval.

For mass production, the manufacturing files (Gerber, BOM, assembly), test fixture and software version control are prepared, and I support the technical documentation needed to enter compliance testing.

What I offer

  • Circuit & PCB design

    Schematics, PCB layout, component selection and BOM optimization.

  • Prototype

    Board assembly, the first working device and field testing.

  • Firmware

    ESP32, STM32 and Raspberry Pi; RTOS, OTA and secure communication.

  • Mobile & web app

    iOS/Android app and web dashboard to manage the device.

  • Cloud & IoT

    Telemetry, alarms and remote management over MQTT/REST.

  • Production readiness

    Gerber, BOM, test fixture and version control.

Technologies I use

EDA (schematic & PCB)Gerber/BOMESP32STM32Raspberry PiC/C++FreeRTOSBLEWiFiMQTTSwiftKotlin

Official documentation and resources

Standards and official documentation I follow in projects:

Example projects

A selection of live projects serving real users.

How we work

  1. Free intro call

    We clarify needs, existing systems and goals together.

  2. Quote & roadmap

    Scope, technology, timeline and budget within 24 hours.

  3. Staged development

    Weekly demos and a live test environment.

  4. Launch & support

    Go-live, training and ongoing maintenance.

Free pre-analysisThe first meeting and roadmap are completely free, with no obligation.

Staged delivery and approvalYou review each module on a test environment before we move on.

Written scope and rightsScope, delivery and source code rights are defined in the contract.

Frequently asked questions

Do you develop just software, or hardware too?

I develop both together: circuit board design, prototype, firmware and the device's connected mobile/web app, all from a single developer.

How long does a prototype take?

It depends on scope; for a simple sensor/control board, the first working prototype is usually ready within a few weeks.

Do you support mass production?

Yes; the transition to mass production is supported by preparing manufacturing files, the BOM, a test fixture and firmware version control.

Can you add software or an app to my existing device?

Yes; the existing board is reviewed and the firmware is updated, or a mobile/web app that connects to the device is developed.

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