Description de posteAre you passionate about backend development and data?Join Karos to help optimize our technical platform, supporting the growth of carpooling and our expansion into new regions and countries.Your mission will be twofold :Ensure a highly reliable carpooling servicethat remains fast and responsive, even under increasing usage volumes.Contribute to feature developmentto enhance the experience for both users and our B2B clients, including enterprises and local authorities. You will be part of theWeb & Data teamworking on the core components of our system in close collaboration with the Mobile and Data Science teams. You'll develop new backend features for our Mobile and Web products while improving existing codebases in terms of structure and performance. You'll work alongside three other senior backend developers to tackle these challenges.In all your work, you'll keep a strong focus on performance and quality.What we’re looking for in you :You areautonomousand enjoy working on diverse projects.You have experience developing incomplex, existing systemsYou can dive into third-party code, analyze it, and quickly understand how it works.You aremotivated by technical challengesbut also care deeply about product impact. You aim to ensure that your work meets the expectations of other teams and, most importantly, the needs of our users.Interview with the CTOTechnical interview with backend developersInterview with our Chief Product officerA Fit interview featuring our traditional 3x2 to get to know the team!Additional InformationAlan health insuranceSwile cardwith Karos covering 60% of the costKaros offers thesustainable mobility packageA genuinelyawesome teamCentrally located offices in Parisfully accessible to individuals with reduced mobilityLadies, we know that many women do not apply if they do not have all the listed skills, so take the leap! Gentlemen, we are also looking forward to your applications.Expert proficiency in Pythonwith solid experience in development tools and environmentsRigorouswith a collaborative mindset and familiarity withcode reviewsExperience inREST API developmentand ensuring reliability withunit testingHands-on experience inCloud environmentsGCP, AWS, Azure) andmessage brokerse.g., RabbitMQ, Kafka, Pub / Sub).Strong expertise inrelational databasesincluding query optimization in high-volume environments.Good understanding ofsoftware architecture patternsand familiarity withDjango / Django REST FrameworkKnowledge ofCI / CD toolse.g., Terraform, GitHub CI) and experience improving systemmonitoring and observabilityAwareness ofsecurity best practicesand integration ofexternal APIse.g., SSO, payment providers).Your plus :Karos’ ambition motivates you, and you are excited about making short distance carpooling a new form of public transport. ??