Senior Backend Software Engineer (H/F)

Your ImpactJoin our dynamic team as a Senior Software Engineer in the AI Health Companion division, where your expertise will help us revolutionize healthcare. You will play a crucial role in evolving the Doctolib application into a comprehensive health companion powered by artificial intelligence, enabling patients to manage their health with precision and …

Your ImpactJoin us as a Senior Software Engineer in our Patient domain. Your mission is to revolutionize the Doctolib application into a comprehensive health companion powered by AI, enhancing patient health management with precision, empathy, and safety. You will collaborate within a feature team to develop an AI-driven chat interface designed to address health inquiries from patients and their loved ones.Being part of the Doctolib tech team means creating innovative products and features that significantly improve the daily lives of healthcare providers and patients alike.

About MistralAt Mistral AI, we harness the transformative power of artificial intelligence to simplify everyday tasks, optimize time management, and amplify creativity and learning. Our innovative technology seamlessly integrates into daily workflows, empowering users across various sectors.We are committed to democratizing AI through our high-performance, open-source models, products, and solutions. Our extensive AI platform is tailored to meet the diverse needs of enterprises, whether deployed on-premises or in the cloud. Among our offerings is le Chat, your AI assistant for both professional and personal tasks.As a dynamic team of AI enthusiasts, we believe in the potential of technology to drive societal transformation. Our diverse workforce thrives in competitive environments, dedicated to innovation and excellence. With teams distributed across France, the USA, the UK, Germany, and Singapore, we embody creativity, humility, and a collaborative spirit.Join us in shaping the future of AI—together, we can make a significant impact. Explore our culture further at https://mistral.ai/careers.Role OverviewWe are on the lookout for a talented Software Engineer to architect, develop, and lead the essential systems that drive Mistral’s expansion. This pivotal role sits at the crossroads of engineering, finance, data, and operations. As the inaugural hire in the Enterprise Agents sector, you will blend hands-on technical expertise with strategic direction, collaborating closely with C-level executives and expanding the team as we grow. Your mission will be to transform intricate workflows into scalable software solutions, including integrations, connectors, and dashboards that facilitate seamless data flow throughout Mistral.

Are you looking for a pioneering team that embodies a culture of continuous testing and learning, enabling you to truly pursue your ambitions? Look no further! At SFEIR, your career progression is in your hands—whether you want to advance vertically, horizontally, or across different domains. Your PlaygroundTech Stack: Python, FastAPI, Docker, Kubernetes, TDD.SFEIR AI: A dedicated path to mastering generative AI and agentic coding.Community: 140 Google Cloud certified experts, 30 Google Authorized Trainers, 7 Google Developer Experts. Your ResponsibilitiesDesign and develop robust, high-performance, and scalable APIs using Python and FastAPI.Ensure code excellence through unit and integration testing, TDD, and active participation in code reviews.Architect Cloud-Native services (primarily GCP) using Serverless or containerized approaches (Kubernetes, Docker).Contribute to the industrialization of our products by developing CI/CD strategies and implementing DevOps practices (GitHub Actions).Integrate AI/GenAI solutions to transform complex business processes.Ensure the smooth operation of applications in production (observability, monitoring, performance optimization). Your ProfileYou have at least 4 years of experience in Python development.Proven expertise in FastAPI and REST API architecture.Strong proficiency in Cloud environments (GCP/AWS) with experience in Serverless architectures.A keen understanding and adherence to coding best practices (TDD, code reviews, Clean Code).Curiosity about Generative AI and new technologies. Why Join SFEIR?Every Sfeirian is supported by an Engineering Manager.Opportunities for career advancement into Staff Engineer, Principal Engineer, or Engineering Manager roles.Continuous training with access to Google Cloud Skills Boost.

About UsAt Sierra, we are pioneering a revolutionary platform designed to enhance business-client interactions through advanced AI technology. With our headquarters in San Francisco and expanding offices in Atlanta, New York, London, Paris, Singapore, and Japan, we embody a truly global presence.Our commitment to our core values—Trust, Customer Obsession, Craftsmanship, Intensity, and Family—shapes our culture and drives our actions as we strive for excellence in everything we do.Founded by industry visionaries Bret Taylor and Clay Bavor, our leadership is grounded in extensive experience from top tech firms including Google and Salesforce.Your RoleArchitect and deploy advanced AI agents: You will be responsible for designing and implementing high-performance, dependable, and user-friendly AI agents that are integral to Sierra's success. These are not mere prototypes; they are robust, scalable solutions operating in live environments across various sectors including finance, healthcare, and e-commerce.Lead the Agent Development Life Cycle: You will take full ownership from initial concept through deployment and ongoing refinement, ensuring that our AI agents evolve to meet the highest standards of excellence.Collaborate with major enterprises and innovative startups: Engage with leaders from the world’s largest corporations to tackle their critical business challenges and develop AI agents that redefine operational efficiency. You will also partner with cutting-edge startups, integrating AI agents into their systems.

About UsHarmattan AI is at the forefront of defense technology, specializing in the development of autonomous and scalable defense systems. Following the successful completion of a $200 million Series B funding round, which has valued our company at $1.4 billion, we are actively expanding our teams and enhancing our capabilities to deliver mission-critical solutions to allied forces.We are driven by our core values: creating technologies with meaningful impact, striving for excellence in all our endeavors, setting ambitious goals, and tackling the most challenging technical problems. Our work environment is dynamic and demanding, where rigor, accountability, and execution are paramount.About the RoleAs an Automation Software Engineer, you will be instrumental in designing and developing the software that powers our automated testing and inspection platforms. Within the R&D department, you will develop robust and scalable automation tools that enhance both product development and manufacturing processes. Your primary focus will be on software development for test automation, while also engaging in the integration of mechanical and electrical components of test systems.

About UsAt MARGO, our consultants focus on what truly matters: engaging in complex projects that blend intellectual challenge with real business impact. We support the most prominent players in finance, industry, and technology by designing and developing high-performance software solutions, including distributed architectures, cloud platforms, real-time systems, and large-scale critical applications.Why Join the Software Engineering Practice?You will be part of a team led by Paul Blois, who has been the Practice Manager at MARGO for five years. Working alongside him means benefiting from an in-depth understanding of the company, receiving close mentorship in your career development, and contributing to demanding IT projects with significant impact for our clients.Your ResponsibilitiesYou will join a team of 12 professionals tasked with translating complex financial mechanisms into an elegant and resilient software architecture. At the heart of a leading energy company's market activities, you will design the contract modeling engine that manages the group’s risk exposure.As a Senior Python Developer, your challenges will include:- Architecture & Design: Developing and evolving APIs and microservices capable of modeling rich and varied contractual life cycles.- Engineering Excellence: Ensuring code quality and maintainability (Clean Code, extensive unit and integration testing) in an environment where even a minor miscalculation can have direct financial repercussions.- Domain Modeling: Collaborating with business experts to convert complex management rules (gas purchases, P&L tracking, European regulatory constraints) into high-performing data models.- Performance & Scalability: Optimizing services for the aggregation of massive data volumes necessary for real-time risk management tools.

The AI Platform is at the forefront of Datadog’s AI initiatives, encompassing everything from cutting-edge distributed training infrastructure for our state-of-the-art models to the essential frameworks that power Bits AI and LLMObs. We are on a mission to enhance our offerings beyond just model creation, focusing on the development of tools that will empower engineers to deploy production-ready generative AI systems. This includes creating retrieval-augmented pipelines, autonomous agents, and comprehensive evaluation harnesses.We are seeking a Senior Software Engineer to architect and develop this next-generation platform. You will collaborate closely with the Applied AI, product, and core infrastructure teams to deliver:Large-scale experimentation, training, deployment, and monitoring solutionsDeveloper toolchains tailored for agents and other generative AI applicationsLow-latency serving infrastructure that seamlessly integrates AI features into all Datadog productsAt Datadog, we value a vibrant office culture that fosters relationships, sparks creativity, and encourages collaboration. We operate in a hybrid work environment, allowing our employees to achieve a work-life balance that suits their individual needs.

About UsAt Harmattan AI, we are pioneers in developing next-generation defense systems that are both autonomous and scalable. With a recent $200M Series B funding round that has elevated our valuation to $1.4 billion, we are on a mission to enhance our teams and capabilities in delivering vital systems to allied forces.We operate with a commitment to impactful technology, striving for excellence, setting ambitious goals, and tackling complex technical challenges. Our environment is demanding, and we value rigor, ownership, and execution in our work.About the RoleWe are seeking a talented Software Tooling Engineer to create and enhance the internal tools that will allow our operations to accelerate and scale efficiently. This role involves working with our internal data infrastructure and operational workflows, designing high-leverage tools that support teams across the organization.You will combine strong software engineering skills with a deep understanding of user needs, taking ownership of the architecture, development, and deployment of essential tools for Harmattan’s core operational workflows, including AI-powered internal agents, workflow automation, internal data visualization tools, integrations, and lightweight backend services.ResponsibilitiesInternal Tools & AutomationDevelop internal tools and AI/LLM-powered agents utilized by various teams.Create dashboards, visualization tools, and workflow automations to enhance daily operations at Harmattan AI.Operational Workflow EnablementOptimize core operational processes through customized tools, connectors, and integrations with internal systems.Collaborate closely with teams to identify bottlenecks, rapidly iterate, and provide impactful solutions.Backend & InfrastructureDevelop and maintain lightweight backend services that power internal tools (APIs, data storage, metrics, logging).Assist in cloud deployment and integration with CI/CD and data pipelines.Quality & ReliabilitySet and uphold standards for code quality, testing, observability, and documentation.Ensure internal tools are reliable and meet the operational needs of the organization.

Join aircall, a pioneering unicorn in the realm of AI-driven customer communication platforms, utilized by over 22,000 companies globally to enhance revenue, expedite issue resolution, and effectively scale customer-facing teams. We are transforming the landscape of customer communications by integrating voice, SMS, WhatsApp, and AI into a unified workspace.Our growth is fueled by a straightforward principle: empower teams to work smarter, not harder. Our innovative AI Voice Agent automates routine calls, AI Assist optimizes post-call tasks, and AI Assist Pro provides real-time guidance, enabling individuals to perform at their best. This results in increased revenue, quicker resolutions, and teams that expand confidently.Based in Paris, our European headquarters, we have a robust North American presence in Seattle and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and our business is rapidly expanding, supported by top-tier investors and driven by swift AI innovations across various product lines.Our Work Culture: At aircall, we prioritize customer satisfaction, data-driven decision-making, and delivering significant outcomes. We value ownership, continuous learning, and thoughtful speed. If you excel in a collaborative, dynamic setting where trust and impact are paramount, you will thrive here.We are in search of a dedicated and enthusiastic Senior AI Software Engineer to join our expanding engineering team.In this role, you will oversee the design, development, deployment, and operation of AI-driven features that enhance customer value. Your daily responsibilities will encompass operational excellence, metrics, observability, best practices, and mentoring within your team and across the engineering department.We are committed to quality, excellence, and agility in our delivery processes, and you will play a key role in elevating these standards. Utilizing NodeJS and TypeScript back-end technologies, suitable for each requirement, and always hosted on AWS, we create valuable and resilient services built on voice technology that seamlessly integrate with our customers' essential business tools (CRM, Helpdesk, E-Commerce, etc.).

About UsHarmattan AI is at the forefront of developing autonomous and scalable defense systems. With a recent $200 million Series B funding round, which has positioned the company at a valuation of $1.4 billion, we are actively expanding our teams to provide mission-critical technologies to allied forces.Our mission is guided by our core values: creating impactful technologies, striving for excellence, setting ambitious goals, and tackling the most challenging technical problems. We thrive in a high-pressure environment where accountability and execution are paramount.About the RoleAs we scale our GNC, ML, Embedded Software, and Validation teams, we require robust internal software infrastructure to expedite development and testing. As a member of the Tooling team, you will spearhead the development of a cutting-edge drone simulator, pivotal for our advanced autonomous defense applications. This position offers substantial ownership and an opportunity to engage at the nexus of software engineering, simulation, and AI robotics, with a direct impact on missions.

Join the Ubisoft AI Initiatives team and help architect the future of information lifecycle management at Ubisoft. From advanced hybrid search pipelines to sophisticated agentic reasoning capabilities, we create tools that transform raw data into swift, informed decision-making. If you are eager to push the boundaries of collaboration between humans and AI to tackle complex challenges, this position is perfect for you.We are seeking an experienced Senior Software Engineer to become a vital member of our team focused on developing scalable back-end systems that power these cutting-edge AI applications.ResponsibilitiesAs a Senior Software Engineer – AI Applications, you will play a crucial role in designing and building essential services that enable our solutions. You will work at the intersection of AI, enterprise cloud applications, large-scale data processing, and cloud infrastructure, with numerous opportunities for growth and impact. This role requires a solid understanding of modern architectures, AI/ML integration, and a genuine passion for solving complex problems.Architect and develop back-end systems: Design and implement high-performing, scalable back-end services to support AI applications.Optimize performance: Ensure low-latency serving and high throughput for AI models, agents, and APIs while optimizing speed and reliability.Collaborate with teams: Partner with data scientists and ML engineers to integrate advanced AI models and agents into production, ensuring smooth deployment and monitoring.Cloud infrastructure: Build and maintain cloud-native solutions using platforms like AWS or Azure, focusing on scalability, security, and cost management.Technical leadership: Mentor junior engineers, conduct code reviews, and contribute to the team’s overall technical strategy.Technology watch: Stay updated on the latest trends in AI, cloud computing, and engineering, and propose innovative ideas.Joining our team as a Senior Software Engineer – AI Applications offers a unique opportunity to work on cutting-edge projects that shape the future of AI technology. You will have the chance to:Engage in continuous learning to stay at the forefront of AI advancements.Take on more responsibilities and influence the strategic direction of our AI products while contributing to high-impact innovation.

Join us in revolutionizing the shopping experience through AI-powered conversations.At Gorgias, we are pioneering a platform that transforms customer interactions into meaningful relationships. Our vision is to create a unified AI agent that assists, sells, and re-engages customers at every touchpoint in their journey. We believe that Conversational Commerce is the future of eCommerce, and we are at the forefront of this exciting shift.Our mission is to ensure that every brand interaction is personal, seamless, and intelligent. By merging our extensive product knowledge with cutting-edge AI technology, we aim to make the shopping experience feel increasingly intuitive and connected.To achieve this, we are committed to:Quality: Crafting authentic, brand-aligned conversations.Experience: Ensuring a smooth shopping journey from chat to checkout.Re-engagement: Fostering personal dialogues instead of intrusive marketing.With the rapid evolution of AI in retail, Gorgias is laying the groundwork for the next decade of eCommerce. We envision a future where every brand has its intelligent agent, and every customer feels valued and understood.Join us in making Conversational Commerce a reality.Team & ContextGorgias is an AI-first company dedicated to developing innovative products driven by large language models (LLMs) and agent-based systems. We are the leading conversational commerce platform for Shopify merchants. Our AI Journey team is focused on enhancing the marketing aspect of our vision with AI-driven outbound conversations that engage shoppers through various channels, primarily SMS.Our product is actively utilized by merchants today, processing hundreds of millions of shopper events. We are scaling our operations to enhance AI reliability at higher volumes, broaden our shopper engagement capabilities, and solidify our systems for robust production loads. The most intriguing challenges lie ahead.This role is positioned at the nexus of product engineering and applied AI, concentrating on the development of reliable, scalable, and impactful LLM-powered experiences in production.About the RoleIn this role, you will have the opportunity to: Develop and scale production AI features utilized by thousands of merchants. Engage directly with LLMs, prompts, and agent workflows within a live product setting. Influence the architecture of AI systems as we continuously enhance our platform.

About UsHarmattan AI is revolutionizing the defense sector by developing autonomous and scalable defense systems. With a successful $200 million Series B funding round, valuing us at $1.4 billion, we are on a mission to expand our team and capabilities to deliver essential systems for allied forces.Our operations are grounded in core values: creating technology that has tangible real-world impacts, striving for excellence, setting lofty goals, and tackling the most challenging technical projects. In our rigorous environment, we expect ownership, attention to detail, and execution excellence.About the RoleIn the role of Multi-Agent Mission Planning Engineer, you will be responsible for designing and implementing Guidance, Navigation, and Control algorithms that convert high-level mission objectives into actionable directives for autonomous robots and multi-agent systems. You will link state-of-the-art research with practical autonomy, ensuring our systems are both intelligent and reliable in real-world applications.ResponsibilitiesCreate algorithms that break down high-level missions into structured, solvable guidance tasks for autonomous robots.Develop and enhance mission and path-planning frameworks for autonomous systems.Establish scalable backend systems for mission guidance and execution.Conduct simulations and validation campaigns to evaluate the consistency of autonomy across various mission scenarios.Collaborate with AI/ML, backend, and product teams to ensure algorithms are efficient, testable, and deployable in real-time settings.Candidate RequirementsEducation: Ph.D. or M.S. in Aerospace Engineering, Robotics, Applied Mathematics, AI, or a related discipline. A Ph.D. focused on multi-agent systems or reinforcement learning is highly advantageous.Experience in designing and deploying mission- or path-planning algorithms within aerospace, defense, or robotics sectors is a significant plus.Technical Skills: Proficiency in Python and C++. A deep understanding of autonomous decision-making, multi-agent coordination, and simulation frameworks is essential.Mindset: Proven ability to transition from research prototypes to production-grade systems.Commitment: 100% dedication to Harmattan AI’s mission, vision, and ambitious growth strategy, with a readiness to go above and beyond to ensure operational excellence.

Join the innovative Ubisoft AI Initiatives team and help shape the future of information management within the gaming industry. We are at the forefront of developing advanced hybrid search systems and reasoning agents that transform raw data into rapid, informed decision-making tools. If you are passionate about enhancing human-AI collaboration to tackle intricate challenges, this is the perfect opportunity for you. We are on the lookout for a seasoned Senior Software Engineer to contribute to the creation of robust back-end systems that power our state-of-the-art AI applications.Key Responsibilities:Back-End Systems Development: Design and build scalable, high-performance back-end services that underpin AI solutions.Performance Optimization: Achieve low-latency and high-throughput operation for AI models, agents, and APIs, prioritizing speed and reliability.Cross-Team Collaboration: Work closely with data scientists and ML engineers to seamlessly integrate AI models and advanced agents into production environments, ensuring efficient deployment and monitoring.Cloud Infrastructure Management: Develop and sustain cloud-native solutions utilizing platforms such as AWS and Azure, focusing on scalability, security, and cost-effectiveness.Technical Leadership: Guide junior engineers, perform code reviews, and contribute to the team’s overarching technical strategy.Continuous Learning: Keep abreast of emerging trends and technologies in AI, cloud computing, and software engineering, and propose innovative ideas.As a Senior Software Engineer in AI Applications, you will have a unique opportunity to engage in leading-edge projects that influence the advancement of AI technologies. You will be able to:Participate in ongoing professional development to remain at the forefront of AI innovation.Assume greater responsibilities and influence the strategic development of our AI product offerings, driving significant innovations.

About H H focuses on advancing superintelligence through agentic AI. The company’s mission centers on automating complex, multi-step tasks that people usually handle, aiming for AI agents to help realize the full range of human potential. H seeks talented AI professionals who care deeply about responsible and safe development, as well as technical progress in agentic systems. The culture values openness, ongoing learning, and teamwork. Every team member’s input matters here. Product Engineering at H The Product Engineering team develops H’s Enterprise Platform, which provides customers with tools and services for essential operational needs. This platform supports large-scale computer-use agents, manages complex workflows, and offers a suite for observability, troubleshooting, and evaluation. Product Engineering connects AI research with practical applications and works closely with teams across the company.

Join our innovative team at Datadog, where we are developing cutting-edge AI-assisted tools designed to empower our developers. Our mission is to autonomously generate tests, resolve bugs, and enhance software performance, driving efficiency and productivity.We are seeking a versatile and product-oriented engineer who can swiftly define and deliver products that enable Datadog's customers to become exceptionally productive developers.At Datadog, we prioritize a collaborative office culture that fosters relationships and creativity. Our hybrid workplace model allows our Datadogs to achieve a harmonious work-life balance that suits their individual needs.

About UsHarmattan AI is at the forefront of defense technology, creating autonomous and scalable defense systems. Following our successful $200M Series B funding round, which values our company at $1.4 billion, we are expanding our teams to deliver critical solutions to allied forces globally.We are driven by our core values: crafting technologies that make a real-world difference, striving for excellence in every endeavor, setting ambitious targets, and tackling the most challenging technical problems. Our environment is demanding, where rigor, accountability, and execution are paramount.About the RoleAs a Software Engineer specializing in Infrastructure & Deployment, you will be instrumental in designing the software systems that underpin our manufacturing and production environment. You will be responsible for architecting and maintaining deployment pipelines, automating infrastructure, and managing fleet solutions for our internal production assets, which include engineering workstations, automated test benches, and IIoT components. Your mission is to ensure a high-performance, reproducible, and scalable production line that empowers our R&D and manufacturing teams to operate at an exceptional pace.

About MistralAt Mistral AI, we harness the transformative power of artificial intelligence to streamline tasks, optimize time management, and foster creativity and learning. Our innovative technology is engineered for seamless integration into everyday work environments.We democratize AI through our high-performance, optimized, open-source models, products, and solutions. Our robust AI platform caters to enterprise demands, whether deployed on-premises or in cloud infrastructures. Among our offerings is 'le Chat', an AI assistant designed for both personal and professional use.We are a dynamic and collaborative team, deeply passionate about AI’s potential to revolutionize society. Our diverse workforce excels in competitive settings, dedicated to driving innovation. With teams spread across France, the USA, the UK, Germany, and Singapore, we thrive on creativity, humility, and team collaboration.Join us in redefining the future of AI. Together, we can make a significant impact. Discover more about our culture at https://mistral.ai/careers.About The JobMistral AI is on the lookout for an Applied AI Engineer to champion the adoption of our products, partnering with clients to tackle intricate technical challenges.The Applied AI Engineer - Software Engineer will play a crucial role within our Applied AI Engineering team, focused on ensuring the successful implementation of Mistral AI products. This role involves close collaboration with clients from pre-sales to post-implementation, ensuring our solutions not only meet but exceed client expectations.What You Will Do• Collaborate intensively with researchers, AI engineers, and product engineers on sophisticated customer projects, embedding advanced AI models into client software solutions.• Design, develop, and manage scalable full-stack applications, facilitating seamless interaction between front-end and back-end components.• Work alongside customers to craft complex use cases, providing expert guidance for optimal integration with back-end and front-end interfaces.• Partner with our product and science teams to continually enhance our product offerings and model capabilities, driven by customer feedback.About You• You possess fluency in English.• You hold a degree in Computer Science, Software Engineering, or a related discipline.• You have a minimum of 2 years experience as a technical contributor in advanced technology environments.• You demonstrate strong coding proficiency in Python and TypeScript.• Your passion for AI and innovation is evident in your work ethic and collaborative spirit.