Senior C++ Developer with Qt/QML experience (IoT)

Sigma Software

About The Position

We are looking for a Senior C++ / Qt / QML Engineer to develop user interfaces for embedded smart climate control devices. The role requires strong hands-on development experience, technical ownership, and the ability to independently deliver complex features across C++, Qt/QML, backend services, and embedded Linux environments. The project is focused on the development of smart home and building climate control solutions, with a particular emphasis on wireless connectivity, intelligent control, and energy-efficient operation. The engineer will work on connected embedded devices and systems that manage heating, ventilation, and air conditioning for different types of properties - from apartments and private houses to hotels, industrial buildings, and large residential complexes. You will have an opportunity to work on innovative IoT-based HVAC solutions that help improve comfort, optimize climate control, and reduce energy consumption for customers and society at large.

Requirements

5+ years of commercial C++ development experience
Strong hands-on experience with Qt 6, Qt Quick, and QML
Strong knowledge of modern C++ (C++17/20), object lifetime, memory management, RAII, concurrency, and software design principles
Experience developing UI applications for embedded Linux devices
Strong understanding of C++/QML integration (signals & slots, properties, bindings, object ownership, exposing C++ objects and models to QML)
Practical Linux experience (SSH, shell, logs, processes, deployment, debugging)
Experience using CMake as the primary build system
Experience writing and maintaining automated unit tests
Strong debugging and problem-solving skills
Experience working in Agile development teams
Upper-Intermediate or higher English

Nice To Haves

Experience with Yocto or other Embedded Linux build systems
Experience with Wayland, EGLFS, LinuxFB, or similar embedded display backends
Experience with D-Bus or other IPC technologies
Experience with Qt Concurrent, QFuture, or similar asynchronous APIs
Experience with Google Test / Google Mock
Experience with GDB, Valgrind, sanitizers, QML Profiler, or similar debugging tools
Experience optimizing Qt/QML applications for devices with limited CPU, memory, or graphics resources
Experience working closely with UI/UX designers and implementing Figma-based designs
Experience with IoT, HVAC, Smart Home, or other embedded device-oriented products

Responsibilities

Design, implement, and maintain user interface functionality using C++, Qt 6, Qt Quick, and QML
Take technical ownership of complex features from requirements and design through implementation, integration, testing, and delivery
Design reusable and scalable QML components
Integrate QML user interfaces with C++ backend components, services, device data, and embedded hardware
Make technical design decisions considering maintainability, performance, resource constraints, and delivery risks
Investigate and resolve crashes, memory issues, performance bottlenecks, and integration defects across application and embedded target layers
Design and implement asynchronous and multithreaded application components
Participate in code reviews, technical discussions, estimation, planning, architecture discussions, and risk assessment
Collaborate with UI/UX designers, QA engineers, backend developers, and customer representatives
Mentor less experienced engineers through code reviews and knowledge sharing
Identify improvements in engineering processes, tools, and development practices