Senior Embedded Software Developer (Networking, Security)
Sigma Software3 days ago
Warsaw, PolandSenior
Responsibilities
- Design, implement, optimize, and maintain embedded software components and device functionality for connected IoT systems.
- Develop networking, telemetry, monitoring, remote provisioning, and firmware-over-the-air update capabilities.
- Integrate and troubleshoot Ethernet, Wi-Fi, BLE, LTE, Zigbee, Thread, and other communication technologies.
- Design secure communications and maintain bootloaders, firmware update systems, and device lifecycle-management functionality.
- Perform debugging, troubleshooting, root-cause analysis, and unit, integration, and system-level testing on real hardware platforms.
- Collaborate with architects, hardware engineers, QA specialists, security experts, and customers.
- Prepare technical documentation and contribute to technical planning, estimation, engineering standards, security requirements, and process improvement.
Requirements
- 5+ years of commercial embedded software development experience using C/C++.
- Strong experience with ARM-based microcontrollers, including STM32, NXP, TI, or Silicon Labs platforms.
- 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 covering TCP/IP, UDP, DHCP, DNS, IPv4/IPv6, MQTT, HTTP/HTTPS, and WebSockets.
- Experience with cloud-connected embedded devices, IoT ecosystems, and OTA/FOTA firmware update mechanisms.
- Understanding of embedded cybersecurity concepts including secure boot, TLS/SSL, certificate management, authentication, and cryptographic fundamentals.
- Experience with UART, SPI, I2C, CAN, and Ethernet communication interfaces.
- 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 and upper-intermediate or higher English proficiency.
- Preferred qualifications include experience with IoT cybersecurity standards, secure development practices, lwIP, secure bootloaders, device provisioning, PKI, hardware security modules, Docker, GitLab CI/CD, automated testing frameworks, AWS IoT, Azure IoT, Google Cloud IoT, hardware debugging, and secure manufacturing or device onboarding.
About Sigma Software
Sigma Software is a London-headquartered, privately held IT consultancy that designs and builds custom software for startups and enterprises. The company provides end-to-end services—engineering, web and mobile development, .NET/Java platforms, AR/VR, and UI/UX—delivered via outsourcing, managed teams, and consulting. Founded in 2002, it supports long-term product development and modernization projects across multiple industries for global clients.