We are looking for an experienced Backend Developer / Test Developer with strong Python skills to join the team and contribute to the development of a common web-based project layer for roadside measurement systems.
The goal of the stream is to develop a reusable HMI and API architecture that can serve multiple roadside products and measurement systems, with only minor adaptations and extensions required for different platforms.
The HMI will provide a modern, touch-friendly, web-based user interface with harmonized workflows and a recognizable design across products. The solution will be designed to support different application types and measurement systems while maintaining scalable client performance, including under bandwidth-constrained conditions.
The role has a strong focus on the backend/API layer and automated testing, ensuring reliable data flow from HMI interactions through the API Gateway and service layer to the ROS2 services (ROS2 knowledge is not mandatory for this position).
Key Responsibilities:- Develop and maintain backend modules, utilities, and automated testing solutions using Python.
- Develop and maintain automated API and integration test suites covering application-layer endpoints.
- Test and validate GraphQL and RESTful/gRPC APIs, including schemas, queries, mutations, subscriptions, and service interactions.
- Verify end-to-end data flow from HMI user interactions through the API Gateway / Service Layer to ROS2 services (ROS2 knowledge is not mandatory for this position).
- Validate API contracts, data structures, and schema consistency across system components.
- Develop integration, regression, and contract tests to ensure reliable communication between HMI and backend services.
- Integrate automated tests into CI/CD pipelines, working closely with DevOps and development teams.
- Perform root-cause analysis of system failures at the protocol, logging, and container levels, rather than limiting investigations to UI-level issues.
- Work with embedded systems and target hardware in client office/lab environments, including via VPN or remote access.
- Investigate communication and integration issues involving ROS middleware, embedded systems, and roadside hardware.
- Work closely with Lead Frontend Developers to ensure reliable integration between the web-based HMI and backend services.
- Collaborate with DevOps to integrate API sanity checks, regression testing, and automated validation into Jenkins / GitLab CI pipelines.
- Support the development of a modular architecture that can be reused across multiple measurement systems with minimal adaptations.
- Contribute to troubleshooting and continuous improvement of the overall HMI/API solution.
- Strong professional experience with Python.
- Experience developing backend modules, utilities, and automation frameworks.
- Good understanding of backend application architecture and service-based systems.
- Strong experience with GraphQL, including:
- Schemas
- Queries
- Mutations
- Subscriptions
- Experience with RESTful and/or gRPC APIs.
- Understanding of API contracts, data structures, and service-to-service communication.
- Strong experience with PyTest.
- Experience developing integration and API tests.
- Experience with contract testing and end-to-end testing.
- Experience integrating automated tests into CI/CD pipelines.
- Practical experience with GitLab CI and/or Jenkins.
- Working knowledge of ROS / Robot Operating System and middleware protocols used for communication with embedded/roadside hardware.
- Good understanding of Linux, including shell scripting and system troubleshooting.
- Experience working with Docker containers, particularly in embedded or constrained environments.
- Ability to troubleshoot issues across multiple system layers, including protocols, logs, containers, APIs, and backend services.
- Ability to understand the system holistically from end to end, including:
HMI Web Interface → API Gateway / Service Layer → Shire Backend Services - Ability to analyze dependencies and data flows across different application layers.
- Understanding of modular and reusable software architectures.
- Experience working with roadside systems, traffic management, or measurement systems.
- Experience interacting directly with physical target hardware in laboratory or development environments.
- Experience with ROS2 and related middleware.
- Experience with performance and reliability testing under bandwidth-constrained conditions.
- Experience working with web-based HMI systems or touch-friendly interfaces.
- Familiarity with frontend technologies and modern web application architecture.
- Experience with embedded Linux environments.
We offer*:
- Flexible working format - remote, office-based or flexible
- A competitive salary and good compensation package
- Personalized career growth
- Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
- Active tech communities with regular knowledge sharing
- Education reimbursement
- Memorable anniversary presents
- Corporate events and team buildings
- Other location-specific benefits
*not applicable for freelancers
Skills Required
- Strong professional experience with Python
- Experience developing backend modules, utilities, and automation frameworks
- Understanding of backend application architecture and service-based systems
- Strong experience with GraphQL schemas, queries, mutations, and subscriptions
- Experience with RESTful and/or gRPC APIs
- Understanding of API contracts, data structures, and service-to-service communication
- Strong experience with PyTest
- Experience developing integration and API tests
- Experience with contract testing and end-to-end testing
- Experience integrating automated tests into CI/CD pipelines
- Practical experience with GitLab CI and/or Jenkins
- Working knowledge of ROS and middleware protocols for embedded or roadside hardware
- Good understanding of Linux, shell scripting, and system troubleshooting
- Experience working with Docker containers, particularly in embedded or constrained environments
- Ability to troubleshoot protocols, logs, containers, APIs, and backend services across multiple system layers
- Ability to understand end-to-end HMI, API Gateway, service layer, and backend data flows
- Understanding of modular and reusable software architectures
- Experience with roadside, traffic management, or measurement systems
- Experience interacting with physical target hardware in laboratory or development environments
- Experience with ROS2 and related middleware
- Experience with performance and reliability testing under bandwidth-constrained conditions
- Experience with web-based HMI systems or touch-friendly interfaces
- Familiarity with frontend technologies and modern web application architecture
- Experience with embedded Linux environments
What We Do
N-iX is a global software solutions and engineering services company that helps world’s leading organizations turn challenges into lasting business value, operational efficiency, and revenue growth using advanced technology. Whether you need to build a custom solution, modernize your digital product or acquire extra tech expertise - we have the experience and capabilities to ensure your success. With over 2,000 professionals in 25 countries across Europe and the Americas, N-iX offers expert solutions in cloud, data analytics, embedded software, IoT, AI, machine learning, and other tech domains. Being in business for over two decades, we have worked with dozens of industry-leading enterprises and Fortune 500 companies creating value across a wide variety of sectors, including finance, manufacturing, supply chain, retail, e-commerce, healthcare, and more. Our unique combination of business domain expertise and technical know-how enables us to effectively collaborate with ISVs, tech companies, and enterprises of all sizes. Thanks to the strong tech ecosystem and partnerships with AWS, GCP, Microsoft, SAP, OpenText, Snowflake, and others, we bring extra speed, scale and efficiency to more than 160 organizations across the globe. N-iX is recognized by numerous industry awards, such as CRN Solution Provider 500, Global Outsourcing 100 by IAOP, ISG Provider Lens™, Modern Application Development services providers by Forrester, etc
