Staff Engineer Backend & Saas Integration Martech H/F - LittleBig Connection (part of Mantu)

What they needContextWithin the digital division, the team designs and evolves strategic software architectures to support the group's global growth. Composed of passionate experts (Tech Leads, Software Engineers, Architects), the team aims to modernize the information system, streamline back-office operations, and integrate high-performing, secure SaaS solutions. This role will directly impact the operational robustness of tools and the value delivered to millions of sports lovers and teammates worldwide.Profile analysis starts from September 1stInterviews during weeks 36 & 37Starting date: end of September / beginning of OctoberMissionsDefine, design, and ensure the technical architecture of back-office solutions and complex SaaS integrations at scale.Guide and upskill engineering teams on software engineering best practices, code quality, and security standards.Drive the seamless integration of strategic SaaS solutions into the IT ecosystem, ensuring interoperability, scalability, and high availability.Work closely with Product Managers, Engineering Managers, and Software Engineers to translate business challenges into ambitious technical roadmaps.Technical StackBack-end: Java / Kotlin / Node.js, microservicesEvent Streaming: event-driven architectures with Kafka, CloudEvents, AvroSaaS & Integration: API Management, Data SharingCloud & DevOps: AWS / GCP, Kubernetes, CI/CD (GitHub Actions, Terraform)SkillsMicroservices architecture - ExpertAPI - ExpertCloud Operations - ConfirmedBack-end web development - ExpertKafka - ExpertJava - ExpertLanguagesEnglish - FluentWorking ConditionsLocation: Lille (Hybrid)Daily rate: 690€

Profile wanted8+ years of experience in back-office software engineering and distributed architecture designProven expertise in integrating large third-party SaaS solutions (REST/GraphQL APIs, Webhooks, Message Brokers)Mastery of AI Augmented SDLC (copilot, bmad, mcp servers)Mastery of data governance concepts, IT security, and scalable systemsDemonstrated ability to drive a cross-cutting technical vision and positively influence multidisciplinary teamsExcellent communication skills in both French and English (international environment)Knowledge and experience in Martech context is a strong advantageExpertise in microservices architecture, API, Kafka, Java, and back-end web developmentConfirmed skills in Cloud OPS (AWS / GCP, Kubernetes, CI/CD tools like GitHub Actions, Terraform)