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Senior Software Engineer - Systems 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 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 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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Intermediate / Senior Software Engineer Scientific Engine (Python)
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Join our Paris team as a Senior Software Engineer. You will develop and optimize our Python scientific engine, mentor junior engineers, and collaborate with business teams. We seek a Python expert with 3+ years' experience, strong communication in English/French, and knowledge of microservices an...
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France , Paris
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Descartes Underwriting
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Senior Software Engineer
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Join our Data Platform team in Paris as a Senior Software Engineer. Design and optimize critical data pipelines using Java and TypeScript. Work with Kafka, Spark, and cloud services to power medical monitoring systems. Enjoy benefits like healthcare, stock options, and a vibrant team culture.
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France , Paris
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55000.00 - 60000.00 EUR / Year
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Implicity
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Senior Software Engineer Java
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Join Mirakl Labs as a Senior Java Engineer in France. Design and deploy features across the full stack using Java, Spring, and distributed architectures. Exercise technical leadership, mentor developers, and influence key architectural decisions. Enjoy a hybrid/remote role with full product owner...
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France , Paris; Bordeaux; remote from mainland France
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Mirakl
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Until further notice
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About the Senior Software Engineer - Systems role

Explore Senior Software Engineer - Systems jobs and discover a pivotal role at the intersection of software development and core infrastructure. Professionals in these positions are the architects and builders of the foundational platforms, services, and frameworks that power large-scale, reliable, and performant applications. Unlike roles focused solely on end-user features, Senior Software Engineers in Systems delve into the underlying engine, optimizing for scalability, resilience, and efficiency to support millions of users and complex data flows.

Typically, individuals in this profession are responsible for designing, developing, and maintaining critical system-level software. This includes creating distributed systems, high-throughput data pipelines, low-latency services, and robust platform infrastructure. Common responsibilities involve architecting scalable solutions, conducting deep-dive performance analysis and debugging across the entire software stack, establishing engineering best practices and standards, and providing technical leadership and mentorship to other engineers. They own the full lifecycle of system components, from conceptual design and implementation to deployment, monitoring, and iterative improvement.

The role demands a unique blend of deep technical expertise and strategic vision. Typical skills and requirements include extensive experience with systems programming languages such as C++, Go, Java, or Rust, and a profound understanding of computer science fundamentals like data structures, algorithms, operating systems, and networking. Expertise in distributed systems concepts—including consensus, consistency, and fault tolerance—is paramount. These engineers are proficient in profiling and debugging complex systems, often needing to trace issues from high-level application logic down to native code or kernel interactions. A performance-first mindset, experience with cloud-native technologies and containerization, and a strong grasp of CI/CD pipelines and observability tools are standard expectations. Leadership skills are crucial, as these senior professionals champion technical excellence, drive architectural decisions, and elevate the entire engineering organization through mentorship and the establishment of a culture focused on robustness and scalability.

For those seeking to solve the most challenging engineering problems and build the bedrock upon which digital experiences stand, exploring Senior Software Engineer - Systems jobs offers a career path defined by high impact, continuous learning, and shaping the technological future of an organization.

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