Top Software Engineer Jobs in France

Design and build core platform services, frameworks, libraries, APIs, Python SDKs, and developer tools primarily with C#/.NET and Python. Address distributed computing, data infrastructure, messaging, performance, security, reliability, and scalability challenges. Own technical solutions from architecture through production, investigate complex issues, collaborate with platform users, and contribute to engineering standards, testing, code reviews, and knowledge sharing.

As an Ubuntu Core Software Engineer, you will design and implement features for the embedded Linux operating system, maintain boot mechanisms, debug system-level issues, and collaborate with a global team.

Design, build, and operate domain-driven, production-grade full-stack applications and Domain APIs. Work across backend (.NET/C#), frontend (TypeScript + modern frameworks), testing, CI/CD, IaC, and cloud-native deployments. Collaborate with product, architects, and stakeholders to model domains, define API contracts, drive architecture, and own production reliability while mentoring junior engineers.

Design and build platform tooling to improve developer experience: create CLI, libraries, IaC, workflows and cloud-native solutions; PoC and deploy standards; support cross-team adoption, document and advocate best practices.

Design, develop, and maintain software applications, write efficient code, collaborate with teams, conduct testing, and provide technical support.

As a Software Engineer at Polar Analytics, you will build core systems, manage data pipelines, and innovate solutions for eCommerce brands while engaging with users to improve reliability and performance.

Design and implement backend trading services, own features end-to-end (schema, API, tests, UI integration), contribute to real-time infrastructure and client-facing APIs, and write integration tests against real dependencies.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Build and maintain DataDome's client-side JavaScript Tag and server-side integration modules for edge runtimes and backend platforms. Own integration components across multiple languages, improve CI/CD, testing, performance and security, mentor engineers, support onboarding and incident response, and drive technical direction for integrations.

Own the architecture and evolution of Vocca’s unified TypeScript booking and integrations layer. Build reliable, high-performance integrations with healthcare software vendors, including EHR, PMS, and RIS systems using REST and SOAP APIs. Improve monitoring and failure detection, lead write-back capabilities, establish engineering practices, make architectural decisions, collaborate with operations and support, and help grow the integrations team through hiring and technical leadership.

Staff Software Engineer responsible for leading architectural evolution across a distributed rendering platform, contributing to core backend systems, and improving performance, reliability, scalability, testing, and delivery practices. The role includes mentoring engineers through pairing and design reviews, unblocking teams, shaping technical strategy, improving CI/CD and tooling, and aligning engineering investments with product and business goals.

Build and maintain integrations for North's agentic platform, own the end-to-end integration pipeline, create evals and tests to ensure reliability, tune tool descriptions, and help other engineers add and maintain integrations while using AI responsibly to improve performance and quality.

Embed with strategic customers to design and deliver end-to-end technical solutions. Collaborate with customer engineers and executives, build integrations, own execution, and solve complex problems using code and software architecture.

Build and maintain internal and public-facing APIs and services powering the Web App and developer experience. Develop API functionality, Admin API systems, WebSocket and REST behavior, and usage and billing integrations with Stripe. Investigate production issues and security vulnerabilities, write and review tested code, make technical decisions, and collaborate across engineering, Product, and Design teams.

Design, build, ship, and own high-scale, user-facing product features across frontend, backend, and data systems. Define problems, scope and prioritize work, collaborate with Product, monitor production usage, debug incidents, improve reliability, review code, and mentor engineers. The role requires strong backend expertise alongside React proficiency and ownership from product discovery through long-term maintenance.

Build and ship production AI agents that help mobile app developers manage subscriptions and paywalls. Own agent orchestration, tool execution, context management, evaluation, observability, permissions, and human-in-the-loop controls. Develop reliable, secure, user-facing backend systems, scope projects independently, monitor adoption, improve features after launch, participate in architecture and incident response, and mentor engineers.

The Software Engineer will develop backend systems using Rust, manage multimodal data, and improve data infrastructure with a focus on performance and design ownership.

Canonical seeks open-source enthusiasts to optimize Ubuntu for new silicon technologies, collaborating with teams and customers to enhance software quality and performance across various platforms.

Develop software to enhance consultant productivity, create SaaS products, design architecture for data processing, and assess technologies.

Design and develop services for automating work with a large server fleet while engaging in DevOps processes.

Design and develop services for monitoring servers, improve metrics pipelines, automate maintenance workflows, and investigate incidents to ensure infrastructure reliability.

Lead design and development of Linux kernel functionality for BPF, networking, and security, integrating features into Cilium and Tetragon. Collaborate with engineering, product, customers, and the upstream Linux kernel community to shape technical direction, maintain code quality, and deliver scalable cloud-native solutions. The role may also involve presenting work at technical conferences and contributing to engineering best practices.

Develop and maintain backend and admin software to operate bare-metal cloud infrastructure. Implement Python services, build React/TypeScript frontends or manage IaC (Terraform/Ansible), optimize deployments, refactor legacy code, and collaborate in a Scrum squad to ship next-generation infrastructure features.

Design and build core IaaS/PaaS components (APIs, backends, worker services), add features, improve test coverage and resilience, write technical documentation, run operational rotations, resolve customer incidents, and collaborate across Product, Design, and Documentation.

Develop and maintain Python backend systems powering hardware update, testing, and inventory; own either React/TypeScript frontends or DevOps/IaC pipelines (Terraform, Ansible, GitLab CI/CD, Docker, Kubernetes, Proxmox); bridge low-level hardware data to web APIs; design and ship infrastructure milestones; optimize and test existing code; participate in code reviews and Scrum ceremonies.