OverviewExpleo is a trusted partner for your innovation journey. As a global engineering, technology and consulting service provider, we are ideally positioned to help you achieve your ambitions and future-proof your business. With a smart blend of bold thinking and reliable execution, we're able to fast-track innovation through each step of your value chain.We are strategically positioned to build value, with a global footprint across 30 countries.We are as global and local as you need us to be, with strong best-in-class pan-European technological centers and unique best-shoring capabilities.We leverage a network of high value-adding affiliates in consulting and industrial excellence, and leading partners across multiple sectors to provide you with the most comprehensive services and solutions in an ever-changing environment. ResponsibilitiesAs a System Designer – Onboard Signaling, you will be at the core of the adaptation and specification process for signaling systems (ERTMS/ETCS and legacy systems). Requirements Analysis & System Adaptation Analyze customer documentation (e.G. specifications, functional requirements). Identify and formalize gaps between client needs and generic solutions. Collaborate with the Development Center (DC) to determine how to bridge these gaps. Support the validation of proposed adaptations and their implementation by DC software teams. Ensure traceability through-out the formal documentation, up to the input requirements System Specification & Architecture Produce system and sub-system specifications, define architecture and interface requirements. Draft rules for data preparation (client-specific parameterization ofequipment based on generic rules). Integration & Design Testing Configure the equipment delivered from Generic Development Center in order to meet the project needs. Configure Test bench, integrate and Test the solution in lab (at design level), Participate eventually to investigations on trains when required, Participate to System tests (Track-On-board) of the complete solution within the infrastructure, Support test analysis and feedback to continuously improve the solution. Cross-functional Collaboration Interact with other System Engineers and with other métier engineers to ensure the design fits into the intended architecture, Interact with RAM, Safety, Cybersecurity, Software, and V&V teams throughout the project. Act as a technical contact point for internal stakeholders and customers. Call, conduct, and participate to technical reviews (design reviews, document reviews), QualificationsEducation & Background Master's degree in Engineering (Electronics, Automation, Computer Science, Systems, etc.). First experience or strong interest in railway, aerospace, defense, or other regulated/safety-critical environments. Essential skillsAnalytical mindset and ability to understand complex technical systems. Ability to interact with customers and interpret their needs into structured requirements. Knowledge of system design methodologies (UML, SysML) is a plus. Familiarity with change management, requirement management and traceability tools (e.G. ClearQuest, DOORS). Basic understanding of ERTMS/ETCS principles is a strong asset. Fluent in English and good command of French are mandatory BenefitsAt Expleo, we are committed to providing a competitive salary and substantial benefits offering with unique wellbeing, financial and employee recognition programs. We pride ourselves on our diverse and inclusive culture and offer a variety of family-friendly policies and enhanced leave to help you achieve a healthy work life balance. By providing significant learning and development opportunities, we encourage individual growth and success throughout your career with us. Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges We empower all passionate technology-loving professionals by allowing them to expand their skills and take part in inspiring projects Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses Enjoy a comprehensive benefits package, including hospitalization and outpatient insurance, a pension and group insurance plan, employee wellbeing initiatives, sports and social events, gifts for special occasions, and much more Enjoy meal and eco vouchers to support your daily needs and sustainable purchases Receive monthly representation fees to support work-related expenses 32 vacation days for a 40-hour week). Mobility package offering flexibility: choose between a company car, full transportation coverage, or a housing allowance. Always working as one team, our people are not afraid to think big and question the status quo. Flexible homeworking policy – Balance your career and personal lif