Senior Full Stack Developer

About UsCryptoNext Security is a pioneering deeptech startup focused on post-quantum cryptography. We empower institutions and enterprises to navigate a future where quantum computing poses a threat to existing cryptographic standards. Our collaborations span major sectors including finance, defense, and telecommunications, as we deliver state-of-the-art, qu…

Role Overview Capimoney is hiring a Staff Full Stack Engineer in Paris. This role focuses on building and maintaining applications that improve the financial experience for users and make financial processes more efficient. The work involves both front-end and back-end development. What You Will Do Design, develop, and maintain full-stack software applications Work with teams across disciplines to deliver reliable software Contribute to projects that support client needs and business goals Collaboration This position works closely with cross-functional teams to ensure solutions are high quality and align with client requirements.

About Nabla Nabla brings together entrepreneurs, healthcare professionals, and engineers to restore the joy of practicing medicine. The team collaborates closely with innovative clinicians, applying advanced machine learning to build an AI assistant that strengthens the human connection in healthcare. By streamlining clinical documentation, Nabla helps providers focus on patient care. Today, more than 100,000 clinicians from over 130 healthcare organizations use Nabla to support their daily work. With $70M secured in a recent Series C round, Nabla is expanding to advance clinical AI and improve experiences for clinicians and patients worldwide. The company is currently developing a proactive assistant with ambient listening, dictation, coding, and command features to simplify both clinical and financial workflows. AI and Product Development Over the past three years, Nabla has invested deeply in product development. The team includes former Meta AI Research engineers, working at the intersection of AI and healthcare. Nabla’s Machine Learning group leverages the latest research to unlock new possibilities for care delivery. Yann LeCun, Chief AI Scientist at Meta and Turing Award recipient, advises Nabla. Engineering at Nabla Nabla’s engineering culture is lean, agile, and technical. Teams specialize in machine learning, native desktop applications, and platform infrastructure, all focused on delivering reliable AI solutions at scale for clinical environments. Role Overview: Full-Stack Engineer (Paris Office) The Full-Stack Engineer will join a cross-functional squad, working alongside product managers, designers, engineers, and domain experts. Squads at Nabla operate with strong ownership, taking products from concept to launch together. Main Responsibilities Build and improve features for Nabla’s web and desktop products. Help design and implement back-end APIs and services.

Join Assystem as a Senior Full Stack Developer (H/F) in Lyon, where you will leverage your expertise in both front-end and back-end technologies to deliver cutting-edge solutions. You will be an integral part of our dynamic team, collaborating with cross-functional units to design, develop, and maintain robust applications. This role requires a deep understanding of software engineering principles and a passion for innovation.

Join our innovative team that is reshaping the future of global living.At The Flex, we envision a world where renting a home is instant, intelligent, and effortless — as seamless as booking a ride. Our ambitious goal is to enable anyone to live anywhere, anytime, without friction.Utilizing Base360.ai, our proprietary automation engine, we’re constructing the operating system for modern renting — integrating property data, orchestrating operations, and facilitating seamless stays across continents.If you are passionate about technical ownership, system architecture, and building platforms that function at real-world scale, this role places you at the heart of how millions of people move, live, and interact with the world.

Role Overview Artelia seeks a Full-Stack Engineer & Generative AI Specialist in Échirolles. This position centers on building software solutions that draw on both front-end and back-end skills, with a strong emphasis on generative AI. The team values technical curiosity and a collaborative spirit. What You Will Do Design and develop software using modern full-stack technologies Apply generative AI methods to solve real-world challenges Work closely with colleagues across disciplines to deliver project goals What Artelia Looks For Experience in both front-end and back-end development Knowledge of generative AI concepts and tools Interest in complex problem-solving and new technologies Comfort working in a collaborative, project-focused setting

Are you passionate about innovating in the tech world? Do you thrive on tackling intricate business challenges in a dynamic, collaborative, and inclusive environment? At Capital One, you will join an energetic team of innovators and problem-solvers committed to addressing genuine customer needs.We are on the lookout for Full Stack Software Engineers who are eager to integrate data with cutting-edge technologies. As part of the Capital One team, you will play a pivotal role in a significant transformation initiative.In this position, you will contribute to an enterprise-wide data management and governance application designed to oversee digital assets, including datasets, data stores, and applications across Capital One. This centralized repository will enhance the navigation, discovery, and management of digital assets, ensuring data security and compliance.

Who Are We? Safran.AI (formerly Preligens) specializes in advanced artificial intelligence solutions designed for analyzing high-resolution satellite imagery, full motion video (FMV) streams, and acoustic signals. Our innovative tools are deployed across the aerospace, defense, and governmental sectors. Since 2016, the company has been at the forefront of developing complex algorithms and software that automate the analysis, detection, and identification of military-relevant objects using both commercial and governmental data sources. As a part of the Safran group since September 2024, Safran.AI is also instrumental in transforming the group by applying AI solutions to Industry 4.0 domains. For instance, automated image analysis can assist inspectors in identifying potential anomalies in critical components from digital photographs. At Safran.AI, innovation and the pursuit of a safer world are embedded in our culture. Joining our team means collaborating with passionate, multi-disciplinary experts (engineers, researchers, developers) who are driven by a shared commitment to technological excellence. We foster a stimulating work environment where creativity and initiative are encouraged, and every idea is valued. Your Mission, Should You Choose to Accept It As a Full Stack Developer, you will be instrumental in the design and ongoing development of our product and infrastructure, primarily utilizing Python, PostgreSQL, and other cutting-edge technologies. → Design, develop, and maintain our back-end infrastructure and automated pipelines.→ Create, maintain, and evolve user interfaces (JS/CSS) for partner plugins.→ Collaborate with the team on specifications, testing, and technical best practices.→ Work closely with all teams and subject matter experts to understand end-user needs.→ Ensure high code quality for our frameworks by applying best practices and mentoring others. Technology Stack:Our development teams primarily use Python for back-end development and JavaScript (React) for front-end solutions. We also leverage Docker for deployment and SQL/PostgreSQL for database management.

About the RoleMaki is revolutionizing the field of talent acquisition and management through innovative AI-driven solutions. As a Software Engineer, you will take charge of the entire lifecycle of our AI products, ensuring their success from conception to deployment.Lead Technical Initiatives: Oversee and execute technical projects with a holistic full-stack approach, ensuring an optimal balance between speed and quality.Develop Reliable Systems: Create systems that maintain effectiveness despite unpredictable components, harnessing AI agents in real-world scenarios.Utilize Cutting-Edge Technologies: Keep our technology stack at the forefront by incorporating the latest advancements in Large Language Models (LLMs), vision models, and agent architectures.Collaborate Across Teams: Work with various stakeholders to pinpoint user challenges and engineer immediate solutions that enhance user experience.Who You AreWe seek dynamic, product-oriented full-stack engineers eager to make a significant impact and embrace ownership in a streamlined, high-performance team environment. You should be:Autonomous: A self-starter who drives projects to completion and thrives in leadership roles.Innovative: Passionate about AI technologies and keen to actively apply them in your work.Foundational: Interested in contributing to a high-growth journey by shaping our technology and culture from the ground up.Our Technology Stack:Backend:Typescript, Python, PostgreSQL, Google CloudFrontend:ReactJS, Typescript, GraphQLIf you're enthusiastic about transforming the future of AI-driven hiring, we want to hear from you!Recruitment ProcessMochi Screening: Experience our product firsthand.Interview with Hiring Manager.Coding Assessment.System Design Interview.Final Interview with the CEO.

Qonto is building a new internal People platform to support over 1,700 team members. This freelance Full-Stack Engineer role centers on designing and delivering a ground-up application for HR operations, including compensation cycles and performance reviews. The position is based in Paris and involves close collaboration with Mélodie, Head of People Systems, and the broader People team. What you will do Deliver the MVP by November 2026: Lead the migration of key Workday modules into a custom application. The stack uses React for the front end and Python or Go for the back end. The platform will manage sensitive HR workflows for more than 1,700 users, so timely and high-quality delivery is critical. Shape the product vision and roadmap: Partner with People teams to conduct user discovery, challenge specifications, and help prioritize features. Decision-making covers both what to build and how it is built. Prioritize security and compliance: Design systems to handle sensitive personal data, ensuring GDPR compliance and enforcing strong access controls and data residency standards from the start. Accelerate with AI tools: Use tools such as Cursor, Claude Code, and Copilot to speed up development. Where relevant, incorporate AI-powered features into the platform. Requirements Experience building full-stack applications with React and either Python or Go. Ability to work independently and drive a project from concept to production. Comfort working closely with non-technical stakeholders to shape product direction. Strong focus on data security and compliance. This project is not just about supporting existing systems. It offers the chance to build a new platform from scratch, with real input into both technical and product decisions. Qonto values diversity and evaluates candidates based on skills and potential. Read more about Qonto's approach to fair hiring.

Internship Overview Alten is looking for a Full-Stack Engineer intern with a focus on Generative AI to join the team in Grenoble. This internship offers the chance to work alongside experienced engineers and contribute to projects that use recent developments in artificial intelligence. What You Will Do Work closely with team members on full-stack development tasks Help design and build solutions involving generative AI technologies Apply new AI techniques in real-world applications Location Grenoble

Join our dynamic technical team of around thirty professionals in a warm and fun work environment! You have the freedom to choose your preferred workstation setup, allowing you to work in the way that suits you best.Your day-to-day will involve tackling a diverse range of challenges, including API development, implementing new features, creating proofs of concept (POCs), and managing application maintenance (TMA).Our technology stack includes:NodeJs & ExpressJS;AngularJs, VueJs;MongoDB, Postgres;Kubernetes & Docker;AWS;

At The Flex, we envision a future where renting a home is as instantaneous, intelligent, and hassle-free as booking a ride.Our ambitious goal is to empower individuals to live anywhere, at any time, without the usual barriers.Driven by our innovative Base360.ai automation platform, we are crafting the ultimate operating system for modern rentals — seamlessly integrating property data, streamlining operations, and facilitating effortless stays worldwide.If you are passionate about web technologies, API-driven solutions, automation, and scalable operations, this is your chance to influence how millions navigate, reside, and engage with the world. What You’ll BuildAs a Full-Stack Engineer (Web & APIs), you will be responsible for designing, developing, and scaling the essential web applications and APIs that drive The Flex platform — enabling immediate bookings, smart access, automated workflows, and predictive operations.Your role will encompass all aspects of frontend design, backend development, and cloud infrastructure, transforming intricate operational hurdles into elegant, scalable, and API-centric solutions.You won’t merely deploy features.You will enhance efficiency, unlock automation, and lay the groundwork for a sophisticated, global rental network. Your MissionBuild the PlatformCreate fast, dependable, and scalable web applications and APIs that facilitate bookings, payments, availability, and guest interactions.Design API-First SystemsDevelop robust, well-documented APIs that connect Base360.ai to internal systems and external partners.Automate at ScaleConstruct event-driven services and automated workflows to eradicate manual processes across the organization.Connect the EcosystemImplement impactful integrations with partners including Airbnb, Stripe, Hostaway, and Twilio.Deploy with ConfidenceLaunch and maintain serverless infrastructure on AWS, optimized for speed, reliability, and global reach.Solve Real ProblemsAddress challenges such as real-time booking synchronization, pricing intelligence, keyless access systems, AI-driven alerts, and live operational dashboards.Build With PurposeWork closely with product, data, and operations teams to transform concepts into tangible, measurable outcomes.

This opportunity is exclusively available for candidates currently residing in Europe.In this role, you will ensure that Waniwani's infrastructure remains seamless and efficient at scale.We have pioneered the first insurance application within ChatGPT, and now numerous companies are eager to launch their own AI-driven storefronts using our platform. Each of these businesses requires its own MCP server, unique codebase, and tailored distribution—all functioning flawlessly, interconnected, and overseen by you.About UsWaniwani is revolutionizing the AI distribution framework for the $10 trillion services sector. We empower businesses to offer quote-based services (insurance, wealth management, etc.) directly within LLMs, where consumer decisions are increasingly being made. Envision Shopify, but tailored for services. We are constructing the foundational infrastructure for AI-native commerce.We are at the beginning of a transformative platform shift. Our launch of ChatGPT insurance resulted in $26 billion in market cap losses for the world’s largest brokers within just 48 hours. The media dubbed it "the industry's ChatGPT moment." We refer to it as Day 1.Purpose of This RoleHaving surpassed the proof of concept stage, our product is fully operational. We now need to support hundreds of clients simultaneously, each requiring their own MCP server, bespoke data pipelines, and distribution dashboards, all while ensuring the platform operates smoothly.This position presents a systems-level engineering challenge. You will be responsible for the architecture that allows Waniwani to scale from a handful of deployments to thousands. You'll work with multi-tenant infrastructure, orchestrate multiple codebases, and manage real-time data flowing through hundreds of interconnected services. One flawed abstraction could cost us months, while one well-designed abstraction could save years.We anticipate that 95% of your code will be generated by AI. Your true value lies not in typing but in discerning what to build, how to architect it, and when the AI makes errors. You will operate at a pace that integrates LLMs as a fundamental part of your engineering process, not as a gimmick. The real constraint will be your judgment, not your typing speed.Your ResponsibilitiesOversee the multi-tenant platform. Design and sustain the infrastructure that accommodates numerous MCP codebases—each independent, customizable, and all viewable from a unified interface (or MCP).Construct the data backbone. Devise the pipelines and frameworks necessary for seamless data integration and analysis.

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.

Role Overview Artelia is looking for a Full-Stack Engineer & Generative AI Specialist in Saint-Ouen-sur-Seine. This position focuses on building new solutions using the latest technologies in generative AI. The work supports Artelia's broader offerings and contributes to ongoing innovation. What You Will Do Develop and maintain full-stack applications with a focus on generative AI features Work closely with teams from different disciplines to move projects forward Help shape technical approaches that improve Artelia's products and services

Role Overview Quadient is looking for a Full Stack Software Engineer to join the Research & Development team in Paris. This position focuses on building and improving software that strengthens our product lineup and supports customer needs. Collaboration with colleagues from different specialties is a key part of the job. Main Responsibilities Design and develop scalable web applications. Work alongside UX/UI designers to shape user-friendly interfaces. Take part in code reviews and help uphold strong coding standards. Join Agile ceremonies and contribute to project planning and delivery.

Role Overview asifr is looking for an Experienced Full Stack Developer to join the team in Brest. This role focuses on building applications that improve user experience and support business goals. The position calls for strong skills across both front-end and back-end development. What You Will Do Develop and maintain software applications from concept to deployment Work across the full technology stack to deliver reliable, high-quality solutions Collaborate with team members to enhance features and address technical challenges What We Look For Proven experience in both front-end and back-end development Ability to deliver software that meets user and business needs Strong problem-solving skills and attention to quality This position is based in Brest.

Join our dynamic team at iliad-free as a Full Stack Developer. In this role, you will leverage your technical expertise to design, develop, and maintain innovative web applications that enhance user experience and drive business growth. Collaborate with cross-functional teams to deliver high-quality solutions while embracing the latest technologies and best practices.

Who are we?At MARGO, our consultants focus on what truly matters: tackling complex projects that combine intellectual challenges with real business impacts. We support major players in finance, industry, and technology in 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, Practice Manager at MARGO for five years. Working alongside them means benefiting from in-depth company knowledge, receiving close support for your career development, and contributing to demanding IT projects with significant impact for our clients.Your Responsibilities- Design, develop, and optimize a new web application for the reporting, tracking, and auditing of insiders (staff with access to sensitive information) for a major banking client.- Participate in defining and implementing a high-performing and scalable architecture.- Address performance optimization challenges in both front-end and back-end systems.- Ensure code quality, maintainability, and security of the solution.- Collaborate closely with product, security, and infrastructure teams for seamless integration.- Contribute to code reviews, continuous improvement, and the sharing of best practices.Languages: Java 17, TypeScriptAssociated frameworks and technologies: Spring Boot, Angular 12, Git, CI/CDChallenges: performance, response time optimization, robustness, and regulatory complianceDesired ProfileWe are looking for a full-stack developer who is passionate about real-time systems and interested in financial markets, eager to work in complex and high-performance environments.- Education level: Master’s degree (engineering school or university).- Strong skills in both back-end and front-end development, multithreading, performance optimization, and good development practices (SOLID, unit testing).- Experience in developing critical systems, real-time data stream processing; experience in finance is a plus.- Ability to solve complex technical problems.