Senior Fullstack Software Engineer - AI (Backend Focus)

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 int…

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 Speechify as a Senior Software Engineer focusing on Windows/Desktop applications in the vibrant city of Paris. In this role, you will be instrumental in designing, developing, and maintaining high-quality software solutions that redefine how users interact with text and audio. Your expertise will guide our team in implementing innovative features that enhance user experience and drive our mission forward.

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.

Join Aircall, a leading AI-driven customer communications platform, revolutionizing how over 22,000 businesses worldwide engage with their customers. Our innovative technology seamlessly integrates voice, SMS, WhatsApp, and AI into one cohesive workspace, enhancing team efficiency and driving revenue growth.At Aircall, we believe in empowering teams to work smarter through automation and AI. Our AI Voice Agent takes care of routine calls, while AI Assist optimizes post-call tasks, allowing teams to focus on what truly matters. The outcome? Enhanced revenue, quicker resolutions, and scalable teams ready to take on challenges.With our headquarters in Paris and a strong presence in North America, we’re building a product that customers adore and a rapidly growing business supported by top-tier investors. Our commitment to AI-driven innovation spans multiple product lines, ensuring we stay at the forefront of customer communication solutions.Our Work Culture: We prioritize customer obsession, data-driven strategies, and meaningful results. At Aircall, ownership, learning, and a balance of pace and thoughtfulness are key. If you thrive in a collaborative, fast-paced environment where trust and impact are paramount, you’ll find your place with us.We are seeking a passionate and dedicated Senior Software Engineer to join our Workspace team as a Desktop Specialist.As the primary architect of our flagship product, the Workspace, you will oversee the design, development, and deployment of our Electron application. Your role will be critical in ensuring a seamless and native-grade experience for our users by effectively bridging our web application with the operating system.Your day-to-day responsibilities will include advocating for best practices, mentoring fellow engineers, and maintaining a focus on quality, agility, and excellence in our delivery processes.

Are you interested in joining our dynamic team? Submit your spontaneous application here, and we will get back to you!

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 a pioneering defense contractor dedicated to developing autonomous and scalable defense systems. Following our successful $200 million Series B funding round, which has positioned us at a valuation of $1.4 billion, we are actively expanding our teams and capabilities to deliver critical systems to allied forces.Our mission is driven by our core values: creating technologies that have a tangible impact, striving for excellence in all aspects of our work, setting ambitious goals, and tackling the most challenging technical obstacles. We operate in a high-pressure environment where rigor, ownership, and execution are paramount.At Harmattan AI, we design and implement state-of-the-art AI-powered defense systems. Our work is at the forefront of technology and national security—dynamic, high-stakes, and deeply mission-oriented.We are selective in our hiring, prioritizing urgency, precision, and a commitment to solving significant problems. If you are an expert in your field and motivated by making a real-world impact, we encourage you to apply.Even if you don't see a specific role that aligns perfectly with your experience, we welcome proactive applications from individuals who excel in high-responsibility environments and possess deep expertise in areas such as:Aerospace & Robotics – GNC, autonomy, flight software, mission planningEmbedded Systems & Hardware – FPGA, real-time systems, electronicsSoftware & AI – machine learning, perception, signal processingBusiness, Strategy & Operations – program execution, partnerships, international expansionWhat We’re Looking ForWe value candidates who:Set high personal standards for quality and technical excellenceDemonstrate ownership and agility in uncertain situationsChallenge assumptions, push boundaries, and deliver results under pressureAre inspired by complex challenges with significant geopolitical implicationsApplication RequirementsA resumeA brief message outlining your strengths and how you envision contributing to our missionWe meticulously review all applications and will reach out if there is a potential fit.

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.

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 compassion.Your primary responsibility will be to collaborate within a feature team to develop an AI-driven chat interface designed to address patients' inquiries regarding their health and the health of their loved ones. Your contributions will directly enhance the experience of healthcare teams and patients alike.

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.

About Us Safran.AI, formerly known as Preligens, is a subsidiary of Safran Electronics & Defense, specializing in artificial intelligence solutions for analyzing high-resolution satellite imagery, full motion video (FMV) streams, and acoustic signals. Our innovative solutions are implemented in the aerospace, defense, and governmental sectors. Since 2016, our company has been developing sophisticated algorithms and software that automatically analyze, detect, and identify military-relevant objects from both commercial and governmental data sources. Following our integration into Safran in September 2024, Safran.AI is also playing a pivotal role in the group’s transformation by applying AI solutions to Industry 4.0 sectors. For example, automated image analysis through AI aids inspectors in identifying potential anomalies in critical components from digital images. At Safran.AI, innovation and the creation of a safer world are at the core of our mission. By joining us, you will collaborate with passionate, multidisciplinary teams (engineers, researchers, developers) among the industry's most talented professionals, all driven by a shared commitment to technological excellence. We provide a stimulating work environment where creativity and initiative are encouraged, and every idea matters. Your Mission, Should You Choose to Accept It As part of Project Robin, an innovative solution for monitoring strategic sites via satellite imagery and AI, already in production with several clients, you will join a team of 7 developers. Together, you will focus on evolving various backend modules with strong scalability and modularization challenges (data pipeline, database, API, orchestration, deployment). Note: The ability to obtain a Defense clearance is mandatory for this position. As a Senior Software Engineer, you will play a central role in bringing your technical expertise to the design, development, and implementation of our complex software solutions. Your responsibilities will include:→ Maintaining and evolving web applications (Python/FastAPI and JavaScript/React).→ Designing, developing, and maintaining our backend infrastructure and automated pipelines (Python, Airflow, PostgreSQL).→ Collaborating closely with all teams and subject matter experts to understand end-user needs.

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 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 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.

The AI Platform team at Datadog is at the forefront of innovation, developing the infrastructure that fuels next-generation generative AI features across our diverse product range. As a Senior Software Engineer on the Evaluation and Annotation team, you will play a pivotal role in designing and enhancing the systems that define and evaluate AI quality at scale. Your responsibilities will include creating evaluation pipelines, monitoring model performance, and establishing annotation workflows that assess correctness, safety, bias, and reliability in real-world applications. Your contributions will directly influence how Datadog develops and sustains reliable AI capabilities. You will collaborate closely with product, machine learning, and infrastructure teams to set quality standards, integrate evaluation systems with our observability platform, and build human-in-the-loop feedback mechanisms that ensure continuous improvement of model behavior. At Datadog, we cherish our office culture, valuing the relationships we build, the creativity we foster, and the collaboration that arises from working together. Our hybrid workplace model enables employees to cultivate a work-life balance that suits their individual needs.

About Mistral AIAt Mistral AI, we harness the transformative power of artificial intelligence to streamline tasks, enhance creativity, and foster learning. Our innovative technology seamlessly integrates into everyday workflows, empowering users across various domains.We are committed to democratizing AI through high-performance, optimized, open-source, and cutting-edge models and solutions. Our comprehensive AI platform is tailored to meet enterprise needs, whether deployed on-premises or in cloud environments. Our offerings include le Chat, the AI assistant designed to elevate both professional and personal tasks.As a vibrant and collaborative team, we are passionate about the potential of AI to revolutionize society. Our diverse workforce thrives in competitive environments and is dedicated to fostering innovation, with teams distributed across France, the USA, the UK, Germany, and Singapore. We pride ourselves on being creative, humble, and team-oriented.Join us at Mistral AI, a pioneering company at the forefront of shaping AI's future. Together, we can create a significant impact. Discover more about our culture at https://mistral.ai/careers.Role Overview: M&A Technology EngineerIn the role of M&A Technology Engineer, you will play a pivotal role in driving our growth strategy through strategic acquisitions. This position requires a robust technical background coupled with a strategic mindset.Your key responsibilities will include identifying and assessing M&A opportunities that align with our technical and business objectives, ultimately enhancing Mistral’s capacity for innovation and expanding our market footprint. You will collaborate with cross-functional teams including Product, Engineering, Legal, and Finance to evaluate potential acquisition targets from a technical standpoint.By executing on high-potential acquisition initiatives, you will contribute to strengthening our technical capabilities, broadening our product range, and solidifying our market position. Your contributions will be instrumental in guiding Mistral AI's future and advancing our mission to democratize AI.