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Senior Software Engineer - Java/Kotlin France Jobs

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Senior Software Engineer
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Senior Software Engineer sought to lead backend development for the Patient Online Booking feature, impacting 90 million patients in France’s top healthcare app. You will drive technical vision, enhance Java and Ruby on Rails performance, and champion AI-augmented engineering. Based in Paris, thi...
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France , Paris
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Doctolib
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Senior Software Engineer (Agentic AI) - Python
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Join Doctolib in Paris as a Senior Software Engineer in Agentic AI. Develop a transformative AI Health Companion using Python, focusing on production-grade agentic systems, safety, and evaluation. You'll need 4+ years of experience, a product mindset, and expertise in SDLC best practices. Enjoy t...
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France , Paris
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Doctolib
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Senior Software Engineer Scientific Engine (Python)
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Join our Paris team as a Senior Software Engineer. You will lead the Python scientific engine, mentor junior developers, and optimize code within a microservices architecture. We seek an expert with strong Python skills, a solid engineering background, and fluency in English/French. Enjoy a colla...
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France , Paris
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Descartes Underwriting
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Senior Software Engineer (Supplier Data Manager)
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Join Akeneo as a Senior Software Engineer for the Supplier Data Manager product. You will scale this critical AI-driven data pipeline, using your deep Python or PHP expertise. Enjoy a flexible remote/hybrid role from Paris, London, or Nantes, with significant benefits and a customer-centric, coll...
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France; United Kingdom , Paris; London; Nantes
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Akeneo
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Senior Software Engineer (Fullstack) - React/Java
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Join Doctolib as a Senior Fullstack Engineer in Levallois-Perret. Develop high-impact healthcare solutions using React and Java/Kotlin in a collaborative, feature-driven team. We value code quality, a user-first mindset, and offer extensive benefits including health insurance and remote work flex...
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France , Levallois-Perret
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Doctolib
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Senior Software Engineer
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Join Airbus Helicopters as a Senior Software Engineer in Marignane. Develop safety-critical embedded software for military mission avionics, ensuring compliance with DO-178 standards. Utilize your expertise in real-time systems, DevOps, and the full V-model lifecycle. A proactive mindset for proc...
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France , Marignane
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Airbus
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Senior Embedded Software Development Engineer – Air-Ground Datalink Systems
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Join Airbus in Toulouse as a Senior Embedded Software Engineer for Air-Ground Datalink Systems. You will design and develop DO-178C certified, real-time embedded software in C, focusing on ATN/ACARS protocols and ASN.1. This role requires deep avionics datalink expertise and offers a comprehensiv...
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France , Toulouse
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Airbus
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Senior Software Engineer - Data Platform
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France , Paris
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Vibe
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Senior Software Engineer (backend, Django) - Sources team
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France , Paris
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GitGuardian
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Senior Embedded Software Architect for Vehicle & Engine Management System
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Join Airbus Helicopters in Marignane as a Senior Embedded Software Architect for Vehicle Management Systems. You will design and develop certified embedded real-time software (C, SCADE) for helicopter avionics, ensuring DO-178 compliance. This role requires over 6 years' experience, strong system...
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France , Marignane
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Airbus
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Senior Software Engineer
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Join our new OpenGRC team as a Senior Full Stack Engineer in France. Build a scalable SaaS/On-Prem product from scratch using React, TypeScript, and Node.js. This high-impact role involves architectural design, rapid MVP iteration, and engaging with the open-source community. Enjoy competitive pa...
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France
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Filigran
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Senior Software Engineer – OpenCTI
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Join the OpenCTI team as a Senior Software Engineer in France. Shape the core of our open-source cybersecurity platform using Node.js, TypeScript, React, and GraphQL. Enjoy a remote-first role with competitive pay, equity, and full autonomy to drive features from design to delivery.
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France
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Filigran
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Senior Software Engineer
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Join OpenAEV as a Senior Software Engineer and shape our open-source platform's core. You'll leverage Spring, Java, React, and PostgreSQL to build impactful features in a remote, async environment. Enjoy competitive pay, equity, and full autonomy while mentoring engineers and tackling technical d...
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France
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Filigran
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Senior Software Engineer
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Join our new XTM One team as a Senior Full Stack Engineer. Shape a state-of-the-art, scalable AI platform using TypeScript and Python in a remote-first role based in France. This high-impact position offers competitive pay, equity, and flexible work while you build a core SaaS/On-Premise product.
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France
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Filigran
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Senior Software Engineer - Integration (Python)
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Join our Integration Engineering team as a Senior Software Engineer. Design and deliver robust Python integration solutions for our core platforms, OpenBAS and OpenCTI. Work remotely from France in an async-first environment, ensuring seamless system interoperability. Enjoy competitive pay, equit...
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France
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Filigran
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Senior Software Engineer (backend, Django) - NHI team
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Join GitGuardian's NHI team in Paris as a Senior Backend Engineer. Develop a world-leading secret security platform using Django and Python. Collaborate on distributed systems and big data flows within a skilled, proactive team. Enjoy comprehensive benefits including equity, health insurance, and...
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France , Paris
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GitGuardian
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Senior Frontend Software Engineer
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France , Paris
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60000.00 - 90000.00 EUR / Year
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Bsport
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Scala Backend Software Engineer, Senior / Lead
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Join Ledger in Paris as a Senior/Lead Scala Backend Engineer. Develop high-performance microservices and APIs for secure crypto transaction services. Leverage 6+ years of experience and technical leadership in a hybrid role with equity, comprehensive health insurance, and a dynamic team.
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France , Paris
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Ledger
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Senior Software Engineer - E-commerce
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Join Ledger's core web engineering team in Paris as a Senior Software Engineer. You will own the end-to-end e-commerce experience on ledger.com, focusing on Web 3 technologies. We seek a craftsman with 5+ years of enterprise experience, skilled in TDD, pairing, and Clean Code. Enjoy flexible remo...
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France , Paris
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Ledger
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Senior Power Systems Software Engineer
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Join a high-level R&D team in Paris as a Senior Power Systems Software Engineer. Design and develop innovative energy sector solutions using Java, Python, and C++. We seek an expert with strong algorithm design skills and knowledge of Kubernetes/DevOps. Enjoy flexible hours and a central office l...
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France , Paris
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Artelys
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About the Senior Software Engineer - Java/Kotlin role

Explore senior software engineer jobs specializing in Java and Kotlin, a high-demand career path for experienced developers who architect and build robust, scalable software systems. Professionals in this role are pivotal in transforming complex business requirements into efficient, reliable, and maintainable applications. Typically, they engage in the full software development lifecycle, from conceptual design and technical specification to implementation, testing, deployment, and ongoing optimization. A core responsibility involves making critical architectural decisions, often designing and implementing microservices, APIs, and cloud-native solutions that form the backbone of modern digital products.

Senior software engineers in the Java/Kotlin ecosystem commonly shoulder a wide array of duties. They design and develop high-performance backend services, distributed systems, and data processing pipelines. Ensuring code quality is paramount; they rigorously write unit and integration tests, conduct thorough code reviews, and advocate for best practices in clean code and design patterns like MVC. Collaboration is a key aspect, as they frequently work alongside cross-functional teams including product managers, UX/UI designers, DevOps specialists, and other engineers to deliver cohesive user experiences. Furthermore, they often provide technical leadership, mentoring junior developers, driving technical discussions, and contributing to strategic planning and knowledge-sharing initiatives.

The typical skill set for these jobs is extensive. Mastery of Java and/or Kotlin is fundamental, complemented by deep knowledge of JVM internals, concurrency, and memory management. Proficiency with popular frameworks such as Spring Boot, Micronaut, or Quarkus is highly valued. These roles require strong experience with both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, Cassandra) databases, as well as expertise in designing RESTful and often GraphQL APIs. Familiarity with cloud platforms (AWS, Azure, GCP), containerization (Docker, Kubernetes), and CI/CD pipelines is standard for deploying and managing applications. A strong understanding of software architecture principles, including event-driven and serverless designs, is essential.

Candidates seeking senior software engineer jobs are generally expected to possess a bachelor's degree in computer science or a related field, along with 5+ years of professional development experience. Beyond technical acumen, success in this senior role demands excellent problem-solving abilities to debug complex issues, a proactive approach to learning emerging technologies, and strong communication skills to articulate technical concepts to both technical and non-technical stakeholders. This career offers the opportunity to work on challenging problems, influence technology stacks, and build systems that serve millions of users, making it a cornerstone role in the technology industry.

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