Top Software Engineer Jobs in Paris

Maintain, monitor, scale, and modernize internal CRM, ERP, ticketing, and backend services. Develop Python and Go microservices, automate workflows, integrate business tools, and improve system reliability, security, and performance. Collaborate with Sales, Finance, Support, and Operations stakeholders; conduct code reviews, write tests, document architecture, and use Docker, Ansible, GitLab CI, and internal LLM tooling.

Lead backend engineering for a SaaS platform: design architecture, build and maintain production REST APIs and relational databases using Python/Django, implement CI/versioning, and support real-time systems (Redis/WebSockets). Influence technical decisions, ship features quickly, collaborate across teams, and help recruit and lead engineers for energy and built-world applications.

As a Senior Software Engineer, you'll enhance REDAPL, lead projects, focus on data ingestion and query pipelines, and ensure platform reliability.

Lead architecture and code quality for payment plugins across six major e-commerce platforms. Establish PHP patterns, testing and linting standards, conduct code reviews, improve test coverage, harmonize cross-platform conventions, and mentor intermediate engineers. The role combines hands-on backend development, technical direction, continuous improvement, and collaboration with AI development tools. It is a permanent position based in Paris or remotely from Metropolitan France.

Design and develop Python backend APIs and payment infrastructure serving merchants and consumers across Europe. Build secure, maintainable, high-performance systems, evolve technical architecture with Product and technology leaders, and lead incident response and performance improvements. The role requires ownership of reliability at scale within a regulated fintech environment.

Design, implement, and review high-performance data infrastructure services and clients. Apply coding, testing, and system design best practices; collaborate with stakeholders to address technical and business needs; and investigate, debug, and resolve system issues. Work with large-scale data systems involving real-time publish-subscribe architecture, sharded databases, caching, multithreading, asynchronous I/O, and big data technologies.

Build and ship high-traffic frontend features for Sorare’s fantasy sports platform. Responsibilities include architecting web experiences, driving projects from inception through launch, collaborating with product, design, and backend teams, optimizing performance and mobile usability, measuring outcomes, and contributing to web strategy. The role requires strong ownership, pragmatic decision-making, rapid iteration, and collaboration in English and French.

Build and optimize performance-critical backend systems processing millions of real-time records. Design and improve Pigment’s formula and query engine, develop services primarily in C# and .NET Core, contribute to React frontend features, and address scalability, performance, reliability, and architecture challenges. Collaborate with product managers and engineers across the application lifecycle while delivering user-focused solutions and maintaining the production platform.

Develop and execute unit, functional, and performance tests for Linux networking drivers. Build verification environments and qualification tools, investigate driver performance issues, analyze coverage, identify verification gaps, and collaborate with developers, architects, and verification teams throughout product development.

Designs and implements behavior planning algorithms for autonomous vehicles operating in structured, low-speed airport environments. Responsibilities include developing C++ and Python software, modeling multi-agent interactions, implementing decision-making and path-planning methods, testing in simulation and real-world scenarios, optimizing system performance, and collaborating with autonomy and engineering teams. The role requires expertise in behavior planning, probabilistic models, real-time navigation, debugging, profiling, and scalable software architecture.

Lead design, develop, deploy and support a performant Python backtesting framework for quants, traders and researchers. Provide technical leadership, define architecture and roadmap, ensure code quality and automated testing, collaborate with stakeholders, and grow a global team supporting quantitative index strategies.

Lead and design scalable backend systems, set technical vision, drive large cross-team projects, raise engineering standards, mentor engineers, and influence company-wide architecture and processes to support product growth and AI initiatives.

Lead development of C12’s quantum measurement software framework. Design architectures for instrument control, high-throughput data storage, and measurement orchestration; collaborate with research and engineering teams to translate experimental requirements into scalable software. Own the software lifecycle, including code reviews, CI/CD, automated testing, security, and maintainability. Mentor junior engineers and promote strong software development practices in a collaborative quantum computing environment.

As a Senior Backend Software Engineer, you'll enhance Vibe's bidding and pacing systems, lead the distribution of system knowledge within the team, and innovate within the audience streaming advertising domain, ultimately driving measurable improvements in performance metrics.

As a Software Engineer Intern, you'll enhance API performance, support R&D tools, maintain backend services, and write clean Python code.

As a Software Engineer, you'll develop innovative projects using Java and various frontend technologies, manage cloud deployments, and improve your skills through training.

Develop and optimize Unity-based LiDAR simulation features, collaborate with R&D, 3D artists and engineers, prioritize releases and bug fixes, redesign codebase, build dynamic simulation tools for model training and demos, and continue crowd simulation and 3D asset integration while profiling for performance.

The Software Engineer will develop high-performance, real-time haptic systems, designing and optimizing engine components, and collaborating across teams for integration.

Develop embedded firmware and low-level software for handheld UAV ground control systems. Responsibilities include integrating displays, input devices, wireless modules, and battery systems; implementing radio interfaces; optimizing responsiveness, power, and thermal performance; collaborating on hardware integration; conducting field validation and debugging; and contributing to scalable firmware architecture.

Architects and deploys multimodal 2D/3D object detection and tracking models using camera, LiDAR, and radar data. Owns perception data collection, dataset development, evaluation pipelines, production monitoring, and the perception system roadmap. The role also requires cross-functional leadership and mentoring junior engineers.

The Senior Software Engineer will solve scaling bottlenecks, deploy new features, manage production issues, design scalable architecture, and collaborate on project planning.

Lead design, implementation, and reliability of Datadog's Private Action Runner, a secure execution layer for running actions and AI agents inside customer infrastructure. Own architecture, scale services, deploy features with feature flags, investigate/fix production issues, and mentor a small team of engineers while transitioning toward an engineering manager role.

The Software Engineer intern will code according to project requirements, optimize game engine subsystems, document technical aspects, and report progress while collaborating with team leads.

As a Software Engineer at Konvu, you'll design and build systems for vulnerability management, iterating quickly based on user feedback while adhering to strong engineering fundamentals.

Develop and maintain a drone simulator, optimize performance, define technical solutions, and collaborate cross-functionally while mentoring junior developers.