Top Software Engineer Jobs in France

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, including LLM inference infrastructure, RAG, AI agents, and evaluation/observability. Design and run experiments (A/B tests), optimize systems for production performance and reliability, and iterate rapidly with product and design partners.

Build and evolve Circle Discover marketplace features: high-converting purchasing flows, algorithmic recommendations, content feeds, and listings. Work across a Ruby on Rails backend and React/Next.js front-ends, optimize performance and SSR/SSG, collaborate with designers and leaders, and improve codebase quality while shipping at pace in a distributed remote team.

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.

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 and ship full‑stack web features and microservices for a cloud‑native genomics platform. Lead design and code reviews, mentor engineers, and develop production LLM applications (RAG, evaluation, citations) using managed endpoints and containerized CI/CD deployments. Collaborate with Product, QA, and Architecture to deliver reliable, regulated healthcare software.

Lead design and delivery of AI-powered visualization and investigation features using LLMs. Build reliable, explainable systems combining deterministic product capabilities with generative models, drive prompt/context engineering, evaluation frameworks, and cross-team product-focused technical leadership and mentorship.

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.

Lead development of tooling and platforms to improve on-call, incident response, and postmortem processes. Mentor engineers, run cross-functional reliability initiatives, analyze incidents to drive systemic improvements, and embed best practices for operational excellence.

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.

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.

As a Java Developer, you will contribute to the development of high-value projects using Java and SpringBoot, while working in an Agile environment and enhancing your technical skills.

Contribute to the development of projects using Java and JavaScript, while improving technical and soft skills in an agile environment.

Develop innovative projects in Java/Spring for backend and Angular/React for frontend, ensuring deployment on Cloud environments.

Develop innovative projects using Java and various frontend frameworks like Angular or React, responsible for deployment on the Cloud.

As a Software Engineer, you will develop web applications in an agile environment, contribute to project development, and share knowledge with your team.

The role involves developing innovative projects in Java/Spring for backend, and Angular or React for frontend, while leveraging cloud deployment.

Build and scale a blockchain data platform handling petabytes of on-chain data. Design and implement distributed systems, data ingestion/decoding pipelines, and performant SQL processing. Write production code (Kotlin, Go, Java, Rust), improve developer experience, automate operations (including AI-driven automation), and own platform components.

Build and maintain scalable workflows and ETL pipelines to produce market risk metrics and regulatory reporting. Produce, validate and communicate risk analytics, optimize data pipelines, and develop BI/visualization solutions to support senior management and regulators. Ensure data quality, timeliness and completeness.

Work in an autonomous squad to design, build and ship fullstack features across billing, data flows, content moderation, and internal portals. Implement microservices (Node.js/TypeScript, React/GraphQL), participate in product discovery, contribute to architecture decisions, use AI tooling to boost productivity, and follow DDD/TDD/BDD best practices.

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.

Join a small agile full-stack team building cloud-native applications to accelerate medicine manufacturing and supply. Design, deliver, and run scalable, maintainable microservices; translate requirements into performant code; own technical decisions; apply CI/CD and DevOps practices; use IaC for cloud deployments; collaborate with product and data teams and promote engineering best practices.

Develop and optimize algorithms for battery and renewable energy projects, analyze market data trends, and ensure algorithm performance.

The Software Engineer will design and develop software architectures, solve complex challenges, lead technical directions, and collaborate with different teams to optimize efficiency and impact.

As a Staff Mobile Engineer at Joko, you will lead mobile application development using React Native, focusing on scalability, performance, and user experience while collaborating with cross-functional teams.

As a Backend Software Engineer, you'll design scalable backend systems, optimize database performance, and collaborate with front-end and DevOps teams.