Top Software Engineer Jobs in Paris

Build and operate end-to-end product features across a Go backend on Google Cloud Run and React frontend. Develop LLM-powered analysis and recommendations, evaluate nondeterministic outputs, design prompts, and create independent connector services for external data sources. The role includes production ownership, system design, customer feedback, experimentation, code reviews, and collaboration with senior engineers.

Build and ship end-to-end features for Akeneo Supplier Data Manager across data-processing pipelines, backend services, and TypeScript/React frontend systems. Help process large, messy supplier catalogues using deterministic workflows and LLM-based extraction and classification. Own features through production monitoring and support, participate in customer discovery, collaborate across the Product Cloud, and develop engineering skills through pairing, code review, and mentorship.

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.

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

Owns field deployment of defense software by integrating platforms with customer systems, developing connectors, configuring and customizing applications, managing on-premises releases, troubleshooting operational issues, and documenting deployments. Works directly with customer technical teams, validates end-to-end data flows, and feeds reusable integration needs back to the core product team. The role requires substantial domestic and international travel and autonomous work in mission-critical environments.

Own backend services, APIs, infrastructure, and frontend dashboards for AI-powered healthcare voice agents. Design reliable, secure, scalable systems serving thousands of medical practices, deliver features from specification through production, improve developer tooling and observability, build modular multi-client architecture, and launch voice agents at scale. The role also contributes to engineering culture, code quality, mentorship, and future team growth while collaborating closely with founders, design, sales, support, and operations.

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.

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

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.

Design, develop, maintain, and optimize high-performance Java software components for the MX.3 capital markets platform. Responsibilities include implementing features, improving existing code, writing unit and integration tests, collaborating with product and QA teams, participating in code reviews, documenting technical designs, and optimizing latency-sensitive systems.

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.

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.

Design, build, and operate Akeneo’s Supplier Data Manager at enterprise scale. Develop reliable data-processing pipelines for messy supplier catalogues, including deterministic and LLM-powered extraction and classification. Create collaboration and governance workflows, ensure production observability and operational excellence, participate in customer discovery, and collaborate across teams. The role requires strong software engineering fundamentals, architectural thinking, debugging ability, end-to-end ownership, and clear communication.

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.

The role involves building high-performance proprietary trading systems, collaborating with traders and engineers to enhance trading efficiency.

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.

Develop and enhance a Python library for research and trading strategies, focusing on end-to-end solutions, backtesting, validation, and production scaling.

Design, develop and maintain robust backend APIs, manage the API landscape, collaborate on B2B solutions, and align architecture with product strategy.

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.

Build and maintain Ergodic AI’s AI platform across back-end and front-end systems. The role involves developing with Python web frameworks and JavaScript/TypeScript, integrating with client technology stacks and workflows, applying AI, ML, and LLM concepts, and contributing to DevOps, cloud deployment, testing, and infrastructure practices. As an early-stage hire, the engineer will help shape the product and solve complex data and AI challenges.

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.