Top Software Engineer Jobs in Paris

As a Website Software Engineer, you will develop and optimize website features, support marketing initiatives, and contribute to architectural decisions while working with a creative team.

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, design and run experiments (A/B tests and AI evaluations), implement AI infrastructure for reliable LLM inference, and iterate quickly to scale production-ready LLM-powered products.

Lead design and development of low-level Linux instrumentation and runtime security using eBPF and kernel APIs. Build reusable monitoring for process, file, and network visibility, ensure performance and reliability, drive feature delivery and testing, and provide technical leadership across product and engineering teams.

Join a team of engineers to work on a complex codebase while utilizing MongoDB, Node.js, and Vue.js. Responsibilities include developing and improving functionalities, collaborating within squads, and onboarding new engineers.

Hands-on senior full-stack engineer for eFront Invest (BlackRock Aladdin). Design, implement, and maintain cloud-deployed .NET features; improve platform architecture, CI/CD, testing, monitoring, and incident investigations; diagnose and modernize legacy components; collaborate with global engineering, product, and QA teams to ensure data quality and operational reliability.

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

Build, ship, and operationally own security integrations and detections (WAF, RASP, API security, IAST, SCA) across Datadog tracing libraries. Design production-grade, polyglot instrumentation (primarily .NET/Java), measure performance and cost, mentor teammates, shape roadmap, and collaborate with product and platform teams.

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

The Senior AI Engineer will develop AI tools to enhance developer productivity at Datadog, focusing on LLM-based systems, prompts, and integration with existing products, while collaborating with various teams and users.

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

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, build, and maintain backend services for Scaleway's network connectivity products. Implement gRPC APIs in Rust, work on InterLink, Site-to-Site VPN, and Public Gateway features, debug complex networking/distributed systems issues, resolve customer incidents with support, participate in architecture and reliability improvements, and collaborate across product, documentation, and engineering teams.

Contribute to backend development of IAM services: build authentication and access-control features, improve security and observability, implement secret scanning and API key tracking, design authentication/authorization policies, and collaborate with engineers, product, and security teams.

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.

Join a small team to develop and operate Scaleway's non-relational database products (Redis, MongoDB). Ensure high-performance, stable production, deploy to new regions, perform code reviews, write docs, follow Agile, and collaborate cross-functionally.

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 will design and maintain backend APIs, oversee API landscape, and collaborate with cross-functional teams to align the architecture with product strategy.

Build and maintain scalable, reliable agentic AI systems for biomedical research, integrating LLMs, tool-calling, and data platforms. Drive technical decisions, optimize analytical workflows, deploy agents on the data platform, mentor teammates, and participate in on-call rotation to ensure performance, security, and continuous improvement.

As a Web Engineer, you'll develop internal tools, growth infrastructure, and real-time dashboards, taking end-to-end ownership of systems to enhance operational workflows.

As a Software Engineer Intern, you'll work with a team to build applications and infrastructure, engage in product decision-making, and contribute to frontend and backend code development.

Design and build scalable serverless solutions on GCP using Node.js, React and Next.js. Map large PIM datasets to retailer formats, own microservices and deployments, champion TDD and observability, mentor engineers, and collaborate cross-functionally to deliver customer-focused sales enablement tools.

Design and build a scalable forecasting platform handling diverse data types; develop real-time exploration tools, secure APIs and SDKs; implement monitoring, alerting, and data scraping automation; integrate ML models into pipelines; iterate from user feedback; and mentor early engineering hires.

Lead design and development of low-level Linux instrumentation and eBPF-based runtime security features for detection, monitoring, and workload protection. Drive architecture, implement performance-sensitive systems, establish testing methodologies, deliver end-to-end features, and provide technical leadership and cross-team collaboration across Datadog's security products.

As a Software Engineer, you'll design and develop software solutions, solve technical problems, lead projects, and collaborate with product and operations teams.