Lead Software Engineer at Theodo | Paris

Role Overview Theodo is hiring a Lead Software Engineer to join its Paris office. This role involves leading a team of developers on impactful projects, shaping software solutions with modern technologies, and setting a high standard for quality. What You Will Do Guide a team of engineers through all stages of software development Work closely with team memb…

Transforming the World Around UsPalantir develops the world's leading software for data-driven decision-making and operations. By providing the right data to those who need it, our platforms empower our partners to develop life-saving medications, predict supply chain disruptions, locate missing children, and more.Position OverviewAs a Forward Deployed Software Engineer (FDSE), you will work directly with government clients to identify their most critical challenges and create solutions that leverage their data. Our clients rely on Palantir's platforms for their most essential operations, often initiating projects with open-ended questions such as “Why are our flights frequently delayed?” or “How can we more effectively identify money laundering cases?”In your role as an FDSE, you will utilize your problem-solving abilities, creativity, and technical skills to help organizations maximize the value of their data, making a significant impact on the world. You will have the opportunity to gain rare insights and contribute to some of the most pivotal industries and institutions globally.Your responsibilities as an FDSE resemble those of a technical lead in a startup: you will collaborate in small teams with minimal supervision and be accountable for the end-to-end execution of high-stakes projects. Your day may involve discussing architecture with fellow engineers, managing large-scale data, coding custom web applications, engaging with the client's leadership team, or strategizing for your team.Whether you aspire to become an entrepreneur or a leader in engineering, we believe that Palantir is the ideal environment to cultivate these aspirations, surrounded by a supportive team. You will learn to dissect complex problems, understand the costs and implications of their solutions, and explore new technologies and programming languages, potentially developing them yourself. You will work independently and make decisions autonomously, all within a community that will challenge and support you throughout your journey and development.Our Principles• Impact: We undertake significant and ambitious projects that make the world a better place.• Responsibility: We manage our projects from inception to completion, ensuring accountability.

believe is hiring a Senior Software Engineer with a focus on React and Java for its Paris office. This role centers on creating web applications that deliver effective user experiences. Key responsibilities Design and build web applications using React and Java Collaborate with colleagues across different teams to understand requirements and deliver solutions Support ongoing enhancements to software products Location This position is based in Paris.

Join our innovative team at dust as a Frontend Software Engineer, where you will play a key role in developing cutting-edge web applications that enhance user experiences. You will collaborate with designers and backend engineers to create seamless, responsive interfaces that delight our users.

Role Overview iliad-free is looking for a Software Development Engineer (F/H) to join its team in Paris. This role focuses on building and improving software that supports the company’s telecommunications services. What You Will Do Design and develop software solutions for iliad-free’s user-facing and internal systems Write, test, and optimize code to improve performance and reliability Collaborate with team members to deliver features that improve user experience Location Paris

Join Arago and the Innovative AragoniansArago is a pioneering AI and computer hardware enterprise dedicated to shaping the future of technology. We are on a mission to accelerate advancements at the crucial intersection of artificial intelligence and semiconductor technology.Founded in 2024 by visionary AI researchers and physicists, Arago unites a talented team of engineers and scientists hailing from some of the world’s most prestigious companies and research institutions.With a diverse workforce representing nine nationalities and operational hubs across France, North America, and Israel, we value exceptional science and rapid accomplishments. Our endeavors are driven by core principles:Strive for Excellence: We take pride in delivering work that meets our high standards.Rapid Progress: We prioritize speed and efficiency, tackling challenges one step at a time.Unity in Purpose: We operate as a cohesive unit, fostering relationships built on trust, respect, and collaboration.Arago is supported by influential leaders from Apple, Arm, Nvidia, Microsoft, Hugging Face, and other esteemed deeptech venture capital firms.

Role Overview Theodo is seeking a Lead Software Engineer to guide the development of healthtech solutions in Paris. This role involves leading a skilled team and setting the direction for projects that impact healthcare delivery. What You Will Do Lead a team of engineers focused on building scalable software for the health sector Shape project goals and technical approaches Oversee the delivery of reliable, high-quality applications Location This position is based in Paris.

Role overview Harmattan AI seeks an Embedded Software Engineer to join the Paris office. The focus is on building embedded solutions that enhance multimedia applications and user experiences. What you will do Design and develop embedded software for multimedia systems Work closely with team members from various disciplines to bring new concepts to life Contribute to maintaining high standards for software quality and performance Location This role is based in Paris.

Join our innovative team that is transforming the future of global living.At The Flex, we envision a world where renting a home is instant, intelligent, and seamless—much like booking a ride. Our mission is ambitious: to empower anyone to live anywhere, anytime, without hassle.Driven by Base360.ai, our unique automation engine, we are crafting the operating system for modern renting—integrating property data, streamlining operations, and facilitating smooth stays across continents.If you are passionate about complex systems, automation, and developing software that has real-world applications, this position offers you the opportunity to take ownership and make a significant impact. What You'll CreateAs a Senior Software Engineer, you will design, develop, and scale essential components of The Flex platform—from core services and APIs to automation workflows and real-time systems.You will work with considerable autonomy, managing problems from start to finish and directly influencing architectural decisions while remaining deeply engaged with production code.This role is for engineers who prioritize impact over meetings and take pride in constructing systems that are reliable, elegant, and scalable. Your ObjectivesDevelop Core SystemsCreate and maintain scalable services that enhance bookings, payments, availability, pricing, and guest experiences.Design Robust APIsEstablish clean, well-structured APIs that connect Base360.ai with internal tools and external partners.Automate OperationsConstruct event-driven workflows that eradicate manual tasks and unlock operational efficiencies.Deploy with AssuranceImplement and manage cloud-native infrastructure on AWS with an emphasis on reliability, security, and performance.Tackle Meaningful ChallengesEngage in real-time booking synchronization, pricing intelligence, keyless access systems, AI-driven alerts, and live operational dashboards.Collaborate for SuccessPartner closely with product, data, and operations teams to transform complex requirements into straightforward, effective systems. Ideal Candidate ProfileExtensive experience in building production systems with Node.js, React, and AWS.Solid understanding of software design principles and best practices.Proficient with CI/CD practices and tools.Strong communication skills and a collaborative mindset.

Join our dynamic team at vusiongroupsa as a Senior Software Engineer, where you'll have the opportunity to contribute to innovative projects that shape the future of technology. We are looking for a skilled professional who can bring their expertise in software development, work collaboratively with our R&D department, and drive excellence in our engineering practices.

Join Scaleway as a Cloud Software Engineer and help shape the future of sovereign cloud solutions! At Scaleway, we are on a mission to build secure, sustainable infrastructures that empower ambitious organizations. Since our inception in 1999, we have evolved from a dedicated server provider to a leading cloud service provider in Europe, with a strategic focus on delivering simplicity, flexibility, and technical excellence. We are backed by the Iliad Group, which is investing €3 billion to develop a sovereign AI alternative to global leaders. As part of our Cloud Product Engineering team, you will design and implement core IaaS and PaaS components that support the delivery of reliable and scalable cloud services. You will collaborate with a diverse team of passionate engineers dedicated to advancing our cloud infrastructure and enhancing system resilience, ensuring that we continue to serve clients across various sectors, from large corporations to innovative startups.

sia is looking for a Junior Software Engineer to join the team in Paris. This role plays a part in building and maintaining the software behind sia’s platforms. Projects here influence how the company’s technology evolves over time. What you will do Assist in designing and developing new software features Support maintenance and ongoing improvements to existing systems Collaborate with team members to address technical challenges What we’re looking for Interest in software engineering and a willingness to learn new skills Drive to share ideas and contribute to team projects This position is based on-site in Paris.

About FinaryAt Finary, we are redefining the investment landscape by empowering individual investors with a comprehensive platform for asset tracking, budget management, investment opportunities, and financial education.Since our inception in 2021, we have rapidly grown to serve over 600,000 users. In September 2025, we successfully raised €25M in a Series B funding round led by PayPal Ventures, with notable support from Y Combinator, Hedosophia, Speedinvest, and industry leaders from Qonto, Photoroom, Bitpanda, UBS, and Wise.We prioritize user experience, performance, and the development of products that significantly enhance financial well-being.TL;DRAs a Staff Software Engineer, you will design and develop high-performance backend services in Rust for our fintech platform, catering to over 600,000 users. You will collaborate with a talented team of 6 Rust engineers across various squads, focusing on investment products, cryptocurrency, or life insurance infrastructure.

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.

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.

About Mistral AIAt Mistral AI, we harness the transformative power of artificial intelligence to streamline tasks, optimize time management, and amplify creativity and learning. Our advanced technology is meticulously crafted to seamlessly integrate into everyday workflows.We democratize AI by delivering high-performance, open-source, and cutting-edge models, products, and solutions tailored to meet enterprise needs, whether deployed on-premises or in cloud infrastructures. Our suite includes le Chat, the ultimate AI assistant designed for both professional and personal use.Our vibrant, collaborative team is deeply passionate about AI and its potential to reshape society. Comprising a diverse workforce that thrives in competitive settings, we are committed to driving innovation across our distributed teams in France, the USA, the UK, Germany, and Singapore. We value creativity, humility, and a strong sense of teamwork.Join us in shaping the future of AI and making a significant impact together. Discover more about our culture at https://mistral.ai/careers.Role OverviewWe are on the lookout for a skilled and experienced Software Engineer to join our Knowledge and Search engineering team. In this pivotal role, you will design, implement, and scale our search capabilities to effectively support both our users and internal systems. Reporting to: VP of Engineering Location: Paris (France) or London (UK)Key ResponsibilitiesWhat You Will Do As a vital member of the Knowledge & Search team, you will connect our customers with the information they require. Your role will involve leading our indexing and searching capabilities, collaborating closely with our data and infrastructure teams to build, maintain, and scale our search platform while ensuring top-tier performance and reliability.Your responsibilities may include but are not limited to:• Developing, maintaining, and enhancing robust, reliable, and scalable indexing and search capabilities (both web and knowledge).

Join vocca as a Software Engineer, where you will contribute to innovative solutions that enhance user experiences. We are looking for creative problem solvers who thrive in a dynamic environment. You will work on exciting projects, collaborate with a passionate team, and have the opportunity to grow your skills.

OUR STORY: Become a part of Scaleway and help us build the sovereign cloud of the future!Since our inception in 1999, we have been committed to creating secure and sustainable infrastructures that support the most ambitious businesses.Initially recognized for our dedicated servers (Dedibox), we transitioned to cloud computing in 2015. Remaining true to our core values of simplicity, flexibility, and technical excellence, we have emerged as a leading force in Europe’s cloud sector.As artificial intelligence continues to rise, we have fortressed our commitment with the support of the Iliad Group, which is investing €3 billion to establish a formidable, sovereign AI alternative to the dominant American and Asian players.Daily, Scaleway proudly serves thousands of customers across both private and public sectors, encompassing corporations like France Télévisions and Hachette Livre, rapidly growing startups like Photoroom and Biolevate, and institutions such as the City of Copenhagen. Our offices can be found in Paris, Lille, Toulouse, Rennes, Rouen, Bordeaux, and Lyon.WHY WE NEED YOU?Our rapid growth necessitates the expansion of our Account team, which is a vital part of the Scaleway Elements cloud ecosystem.This team manages user accounts, personal data, support plans, fraud detection, and more, ensuring a seamless experience across the platform through close collaboration with various product teams. Your role will involve contributing to both the DevOps and feature development lifecycle, aimed at enhancing the reliability, scalability, and quality of our user management services. YOUR FUTURE TEAM:You will join a team of 6 individuals: a friendly and supportive group of developers who prioritize teamwork and continuous improvement. You’ll collaborate with frontend and backend developers to enhance the Scaleway Console, maintaining high standards through automated testing, agile methodologies, and continuous delivery. Manager: Y...

Speechify is looking for a Software Engineer, Platform based in Paris, France. This position centers on developing and enhancing features for the company’s text-to-speech platform. Role overview The main goal is to design and build new capabilities that make Speechify’s platform stronger and more reliable. Work will directly support a better experience for users worldwide. What you will do Create and implement new features for the text-to-speech platform Contribute to projects that improve user experience for a global audience Location This role is based in Paris, France.

About VibeAt Vibe.co, we are revolutionizing the way brands connect with audiences in the streaming era. We envision that streaming TV transcends traditional brand awareness; it is poised to be the next major avenue for performance marketing. Our mission is to create the infrastructure that harnesses this $100 billion potential.As a leader in Audience First Streaming TV Advertising, Vibe.co empowers marketers to leverage TV as an effective growth channel. Our comprehensive solution integrates hyper-targeted audience segmentation, AI-driven insights, real-time campaign optimization, and incrementality measurement, providing brands of all sizes the accuracy and transparency they expect from social and search advertising, applied to the TV landscape.With over 10,000 trusted brands and a reach of more than 120 million households across 500+ apps and channels, Vibe.co consistently delivers an impressive average return on ad spend of 250% and a 20% lift in sales. Achieving a $100 million revenue run rate in less than two years, we are among the fastest software companies to reach this remarkable milestone.Our investors include notable firms such as Hedosophia (early backer of Spotify, Uber, and Airbnb), Elaia, Singular, QuantumLight, and Illusian, alongside angel investors like Carolyn Everson, board member of The Walt Disney Company and Coca-Cola. Nirav Tolia, CEO of Nextdoor, is also a member of our board of directors.Founded in 2022, Vibe.co is recognized as a pioneering platform in streaming TV advertising, merging the power of performance marketing akin to Meta and Google with the fast-evolving media landscape.About the RoleAs a key member of the Performance team, you will play a vital role in managing advertiser outcomes at Vibe. Your focus will be on bidding, pacing, and enhancing the prediction stack that drives these elements. You will report directly to Clément Schiano, Engineering Manager for Performance.This position has been created to address a clear roadmap and enhance execution capabilities, as well as to mitigate knowledge concentration challenges within the team. We seek an individual who can absorb, challenge, and expand upon existing expertise, going beyond simply delivering tickets.Three compelling reasons why a talented candidate would find this role appealing: