🇫🇷 Paris, France · 5h ago
Senior Software Engineer
Sanofi
LinkedInseniorEnglish-friendly
Description de l’emploiLe contenu du poste est libellé en anglais car il nécessite de nombreuses interactions avec nos filiales à l’international, l’anglais étant la langue de travail.This job offer is accessible to all, regardless of gender.Job title: Senior Software EngineerLocation: Paris - Hybrid (3 days a week onsite, 2 days work from home)About The JobSanofi is building a GenAI platform that helps product and business teams move from isolated AI experiments to secure, reusable, production-ready capabilities.In a nutshell, a platform team creates the foundational layers and core building blocks that other teams rely on. We do not always provide direct business value ourselves; we help other technical teams focus on their own products by reducing repeated work, defining shared patterns, and building reusable capabilities.Our Platform Covers Several LayersCloud-native building blocks, infrastructure, and deployment patternsAPIs, SDKs, shared libraries, and internal toolsObservability, security, access control, and operational standardsDocument ingestion, knowledge retrieval, and GenAI data pipelinesAgent creation, agent orchestration, evaluation, and governance capabilitiesGenAI and agentic capabilities are a growing part of that mission. As highlighted in the AWS Sanofi success story, Concierge has evolved into a unified, agentic AI companion used across the company. The GenAI Platform team builds the foundations that make this kind of experience possible: reusable agent patterns, secure APIs, knowledge pipelines, evaluation frameworks, and governed orchestration layers.One key project you will contribute to is AgentsHub, the central platform through which AI agents are registered, discovered, governed, and invoked. AgentsHub is designed to become the high-scale traffic layer between Sanofi applications, such as Concierge, and specialized agents that perform data retrieval, workflow automation, and system write-back.What You Will BuildYou will contribute to platform products built with TypeScript, Node.js, React, AWS services, Terraform, and modern GenAI integration patterns.The role is hands-on and product-oriented. Depending on priorities, you may work on backend APIs, internal UIs, cloud infrastructure, shared libraries, automation tooling, agent registries, knowledge integrations, evaluation capabilities, or operational dashboards.This is not a classical feature-team role where the scope is limited to one business application. You will work on foundational platform capabilities that enable many teams to move faster and build safer, more reliable GenAI products.Job DescriptionYour key responsibilities will beBuild and evolve reusable backend platform capabilities for GenAI applications, AI agents, knowledge retrieval, and cloud-native servicesDesign and implement APIs, shared libraries, and automation workflows used by other engineering teams, including internal UIs and back-office tools for managing platform resources and agentsImprove the reliability, security, observability, and scalability of platform services on AWS, integrating with GenAI building blocks such as Bedrock, Bedrock AgentCore, vector databases, knowledge bases, and agent interoperability protocolsContribute to production-readiness patterns: RBAC, audit logs, health checks, versioning, metrics, and operational toolingCollaborate with squads and product teams to turn repeated needs into reusable platform primitives, and document and advocate for platform capabilities across SanofiWhat We Offer YouA fixed salary over 12 months, supplemented by a short-term incentive, as well as a collective variable compensation based on Sanofi Group results.Because taking care of our employees is also our mission:Benefits & Well-being: Quality health insurance, extended maternity/parental leave (18/14 weeks), enhanced support in case of illness, teleconsultation and second medical opinion covered by Sanofi, as well as many other wellness programs to discover here. Work-Life Balance: 31 days of paid leave + RTT depending on your status, remote work up to 2 days/week Transportation: Public transport coverage up to 80% Savings & Retirement: Group Savings Plan and PERCOL with employer matching, and PERO Professional Development: Internal and international mobility opportunities, learning & development opportunities And more: platforms dedicated to peer-to-peer recognition & service exchanges between Sanofi employees (carpooling, home exchanges, etc.), numerous CSE benefits... About YouKey Technical Requirements & QualificationsYou do not need to check every point. If you fit only some of them and are eager to learn the rest, that is more than enough. Expect to work on most of these topics during your daily tasks.Strong curiosity for GenAI, LLMs, and AI agents; familiarity with GenAI application patterns (LLM APIs, RAG, tool calling, agent orchestration, MCP, A2A, evaluation, guardrails, vector databases) is a plusSolid backend engineering experience in JavaScript/TypeScript and Node.js (Python is a good second option); experience designing and building APIs, backend services, or distributed systemsExperience with AWS or another cloud provider, including serverless/event-driven architectures (Lambda, API Gateway, DynamoDB, SQS, Step Functions, ECS, or equivalents)Understanding of authentication, authorization, RBAC, API security, and enterprise identity patternsInterest in observability, debugging, tracing, logging, and operating production systemsInfrastructure as Code experience (Terraform, CDK, or similar) is a plusReact or modern frontend experience is a plusEnglish is mandatory as we are an international teamSoft And Behavioral SkillsStrong ownership mindset: you care about the product, the users, and the quality of what you shipComfortable working with multiple teams to drive alignment and resultsService-oriented mindset: you enjoy building platforms that help other engineers and product teams succeedSelf-motivated, autonomous, and able to make Progress in ambiguous situationsPragmatic problem solver with critical thinking and good judgmentClear written and verbal communication skillsPositive team player, open to feedback, and willing to share knowledgeComfortable working in a fast-moving environment where patterns are still being inventedYour backgroundSeveral years of experience building software products, backend systems, platform services, or cloud-native applicationsNo specific diploma is required, but a Bachelor’s degree or equivalent experience in Computer Science, Engineering, or a related field is a plusExperience in an innovative environment, internal platform team, startup-like setup, or product engineering team is a plusExperience in healthcare, life sciences, or regulated environments is a plusPrior hands-on experience with GenAI is valuable, but curiosity, engineering fundamentals, and learning speed matter moreWhy this role mattersGenAI is moving from experiments to real operational systems. At enterprise scale, the hard part is not only building one chatbot, one retrieval flow, or one agent. The hard part is creating the platform foundations that make these capabilities secure, reusable, observable, compliant, cost-aware, and easy to integrate into real workflows.That is where the GenAI Platform team works.By joining the team, you will help shape how Sanofi builds and scales GenAI: from knowledge pipelines and shared APIs to agent platforms such as AgentsHub, where high-scale agent traffic can be routed, governed, evaluated, and monitored across the company.This is an opportunity to work on a platform that sits at the intersection of software engineering, cloud architecture, GenAI, and enterprise transformation.Why choose us? Work alongside a supportive and forward-thinking team dedicated to advancing the frontiers of healthcare. Contribute to a company that is not only a leader in healthcare but also a pioneer in digital transformation. Discover diverse career growth opportSourced from LinkedIn. Relocantly aggregates public job postings; apply on the original site.