Senior Embedded Software Developer (Networking, Security)

Sigma Software; Województwo mazowieckie; On-site; PLN 180,000 - 240,000; Full time

Job summary

Sigma Software is seeking a Senior Embedded Software Developer to join our Embedded Development team. You will design and implement secure, connected embedded systems with cloud connectivity and remote device management capabilities for IoT applications.

You'll work with ARM-based MCUs (STM32, NXP, TI, Silicon Labs), develop networking (TCP/IP, MQTT), implement OTA/FOTA, and apply embedded cybersecurity best practices.

Qualifications

• 5+ years of embedded software experience with C/C++.
• Strong ARM MCU experience (STM32/NXP/TI/SiLabs).
• Experience with TCP/IP, UDP, MQTT, HTTP/HTTPS, WebSockets.

Responsibilities

• Design and implement embedded software components for connected IoT systems.
• Develop, optimize networking for cloud-connected devices.
• Implement telemetry, monitoring, and OTA/firmware update mechanisms.
• Integrate Ethernet, Wi‑Fi, BLE, LTE, Zigbee, and Thread.
• Develop secure communication mechanisms per embedded cybersecurity best practices.
• Design and maintain bootloaders and device lifecycle management.

Skills

Embedded C/C++

ARM MCUs

Networking

Cloud IoT

OTA/FOTA

Cybersecurity

RTOS

Git workflows

English

Education

Bachelor's in CS/EE

Tools

J-Link

GDB

Git

Job description

Join our Embedded Development team at Sigma Software and contribute to the development of next-generation connected IoT devices and edge solutions!

We are looking for a Senior Embedded Software Developer with strong networking and cybersecurity expertise to design and implement secure, reliable embedded systems with cloud connectivity and remote device management capabilities.

CUSTOMER

Our Customer is a global technology company specializing in climate technologies and energy management solutions. The company develops connected products and intelligent control systems for commercial, industrial, and residential environments, helping improve energy efficiency, operational reliability, and sustainability through modern smart infrastructure technologies.

PROJECT

The project focuses on developing secure, connected embedded systems that integrate with cloud platforms, support remote device management, and ensure reliable communication in real-world environments. The solution combines embedded software engineering, networking technologies, and cybersecurity principles to deliver scalable and reliable IoT solutions for modern edge devices.

• Design and implement embedded software components and device functionality for connected IoT systems
• Develop, optimize, and maintain networking capabilities for cloud-connected embedded devices
• Implement telemetry, monitoring, remote provisioning, and Firmware-Over-the-Air update mechanisms
• Integrate and troubleshoot communication technologies including Ethernet, Wi‑Fi, BLE, LTE, Zigbee, and Thread
• Develop secure communication mechanisms following embedded cybersecurity best practices
• Design and maintain bootloaders, firmware update systems, and device lifecycle management functionality
• Perform debugging, troubleshooting, and root-cause analysis on real hardware platforms
• Conduct unit, integration, and system-level testing
• Collaborate with architects, hardware engineers, QA specialists, and security experts
• Participate in technical discussions, estimations, planning sessions, and Customer communication
• Prepare and maintain technical documentation
• Ensure compliance with engineering standards, security requirements, and quality processes
• Contribute to continuous improvement of development practices and engineering workflows

• 5+ years of commercial experience in embedded software development using C/C++
• Strong experience with ARM-based microcontrollers such as STM32, NXP, TI, or Silicon Labs
• Strong understanding of embedded systems architecture, RTOS concepts, and hardware-software interaction
• Practical experience with wireless technologies including BLE, Wi‑Fi, LTE, Zigbee, or Thread
• Solid networking knowledge including TCP/IP, UDP, DHCP, DNS, IPv4/IPv6, MQTT, HTTP/HTTPS, and WebSockets
• Experience with cloud-connected embedded devices and IoT ecosystems
• Experience implementing OTA/FOTA firmware update mechanisms
• Understanding of embedded cybersecurity concepts including secure boot, TLS/SSL, certificate management, authentication, and cryptographic fundamentals
• Experience with communication interfaces such as UART, SPI, I2C, CAN, and Ethernet
• Experience with FreeRTOS, Zephyr, Embedded Linux, or similar platforms
• Strong debugging and troubleshooting skills using J-Link, ST-Link, GDB, or equivalent tools
• Experience with Git-based development workflows
• Upper-Intermediate or higher English level

WILL BE A PLUS

• Experience with cybersecurity standards and secure development practices for IoT products
• Practical experience with networking stacks such as lwIP
• Experience with secure bootloader development and device provisioning
• Knowledge of PKI, certificate-based authentication, and hardware security modules
• Familiarity with Docker, GitLab CI/CD, and automated testing frameworks
• Experience with AWS IoT, Azure IoT, or Google Cloud IoT
• Basic hardware design and debugging knowledge
• Experience with secure manufacturing and device onboarding processes