Fullstack Developer (F# / C#) - Brand Payment

As a leader in the online flash sales industry since 2001, Veepee stands at the forefront of European e-commerce, partnering with over 7,000 esteemed brands to deliver exceptional products at unbeatable prices. With a diverse portfolio spanning fashion, home goods, wine, travel, and beauty, Veepee has achieved an impressive turnover of 3.3 billion euros (inc…

Veeva Systems is a visionary organization dedicated to transforming the life sciences sector through innovative industry cloud solutions, enabling companies to expedite the delivery of therapies to patients. As one of the fastest-growing SaaS firms globally, we achieved over $2 billion in revenue last fiscal year, with exciting growth prospects on the horizon.Central to Veeva's mission are our core values: Do the Right Thing, Customer Success, Employee Success, and Speed. We are not just a public company; we made history in 2021 by becoming a public benefit corporation (PBC), committed to balancing the interests of our customers, employees, society, and investors.As a Work Anywhere company, we embrace flexibility, allowing you to work from home or in an office setting, fostering an environment where you can excel.Join us in revolutionizing the life sciences industry, with a commitment to making a meaningful difference for our customers, employees, and communities.The RoleAs an Engagement Manager within Veeva's R&D Consulting team, you will play a pivotal role in leading complex consulting projects for our clients in the research and development domain. You will oversee teams, coordinating, organizing, and monitoring all facets of project delivery. Your contributions will be instrumental in enhancing our brand presence in the market, expanding our client network, and identifying and securing new projects to aid our clients in overcoming their intricate business challenges. You will focus on key areas such as Clinical Development, Regulatory Affairs, Pharmacovigilance/Drug Safety, and Quality Management.

Join us at RTE as an R&D Study Manager where you'll lead innovative research initiatives aimed at advancing technology and solutions within the energy sector. Your role will include managing R&D projects, collaborating with cross-functional teams, and ensuring the successful execution of research studies. We are looking for a dynamic individual who is passionate about research and development, and who thrives in a fast-paced environment.

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 Ubisoft is seeking a Financial Planning Partner FP&A to focus on R&D processes and analytics in Paris. This position works closely with teams across the company, providing financial insights that shape decisions and help allocate resources effectively. The role supports the R&D department as it develops new projects and initiatives.

Veeva Systems is a purpose-driven innovator in the industry cloud sector, dedicated to accelerating the delivery of therapies to patients by life sciences companies. As one of the fastest-growing SaaS enterprises, we achieved over $2 billion in revenue last fiscal year, with significant growth opportunities on the horizon.At Veeva, our core values include: Do the Right Thing, Customer Success, Employee Success, and Speed. We are not just another public company; we made history in 2021 by becoming a public benefit corporation (PBC), committed to balancing the interests of our customers, employees, society, and investors.As a Work Anywhere organization, we promote your flexibility to work from home or in the office, enabling you to thrive in your preferred setting.Join us in transforming the life sciences industry, as we strive to make a positive impact on our customers, employees, and the communities we serve.The Role Veeva's R&D Consulting team uniquely integrates strategy, operations, data, and technology. Establishing a premier R&D consulting practice is a vital strategic priority for Veeva, receiving high visibility within the company and among leaders in the broader Life Sciences sector.As a Principal in a company leading digital innovation in Life Sciences, you will play a pivotal role in expanding our practice in Europe. Your focus will be on strengthening our market presence, cultivating our customer network, and identifying and securing new projects to assist our clients in overcoming their complex business challenges.

Overview Join Esri as a Software Development Engineer Intern in Cachan, where you will leverage your scientific and technical expertise! Collaborate with seasoned software developers and engineers to gain invaluable hands-on experience while contributing to the creation of cutting-edge analytics software used across various industries, including ArcGIS. This full-time, paid internship spans 12 weeks, commencing in late May or June. Interns at Esri have had the opportunity to engage in a diverse array of exciting projects, including: Research and implementation of a large language model (LLM) for testing and test automation. Exploration of Machine Learning-driven GIS for aerial detection. Development of Data Science and Machine Learning tools to identify patterns within extensive datasets. Creation of an augmented reality application for Android mobile platforms. Utilization of Python to enhance 3D segmentation techniques. Development of a JavaScript web application with analytical capabilities integrated into ArcGIS. Integration of geospatial technologies with mobile applications to support first responders during disaster relief efforts. Responsibilities Work collaboratively with the product development team to design, develop, and test software solutions. Enhance your problem-solving skills by tackling and resolving complex issues. Stay informed about emerging technologies and trends in the field of software development. Practice writing high-quality code, adhering to coding standards and version control practices, while participating in code reviews and managing software in a shared repository. Requirements Currently pursuing a Master 1 or Master 2 degree at a university or Grande École in France, with a focus on computer science, applied mathematics, computer engineering, software engineering, or a related field. Proficient in one or more of the following areas: computer vision, deep learning, C++, C#, Python, PyTorch, CUDA. Available for a consecutive, 12-week internship at our Cachan offices starting in May or June 2026. Possess valid work authorization for France. Recommended Qualifications Familiarity with Esri's ArcGIS platform.

Join Sia as a Senior R&D Consultant / Operations Research Researcher and be part of our growth journey. You will collaborate with our team of experts to design and implement AI-driven solutions, operational research methodologies, and decision-making aids. Your role will involve assisting in the development and execution of optimization solutions under constraints and simulation models.Moreover, you will have the opportunity to contribute to AI and generative AI projects, guiding our clients in their digital transformation enhanced by AI, particularly in the following areas:Data Ecosystem Management: Analyzing data, mastering data pipelines, and the associated infrastructure and tools.Statistics and Machine Learning: Developing explanatory and predictive decision-making models (supervised and unsupervised learning algorithms, econometrics, forecasting, quantitative diagnostics, etc.).Generative AI & Large Language Models (LLMs): Designing and deploying LLM-based solutions (e.g., GPT, Claude, Mistral), developing Retrieval-Augmented Generation (RAG) chains, and creating business-specific conversational assistants and autonomous agents.Synthetic and Insightful Reporting: Producing synthesis notes with a strong understanding of business challenges and a good capacity for graphical representation of results.Your internal activities will revolve around the following axes:Manage end-to-end projects with a high degree of autonomy, ensuring the success of missions while meeting client commitments.Mentor consultants, both junior and experienced, acting as a reference point for the manager in overseeing projects, validating deliverables, assessing outcomes, and ensuring their skill development.Handle client relationships for your assignments, establishing a strong rapport with stakeholders at the middle management level, positioning yourself as an expert in your area.Contribute to business development by crafting commercial proposals and identifying new collaboration opportunities with our clients.Engage in technological monitoring and R&D activities within our Operations Research laboratory.Enhance the firm's visibility by actively participating in our publication strategy (articles, studies, white papers, etc.).

We are seeking a Consulting Engineer specialized in public R&D funding, energy efficiency, and circular economy to join our team in Paris, France. This position offers you the opportunity to drive sustainable innovations by guiding businesses through complex public funding landscapes while developing and implementing transformative solutions for energy efficiency and circular economy. You will work closely with our branches in Barcelona and Madrid, assisting clients across various markets in achieving their sustainability goals through strategic consulting and technical expertise.Analyze and assess public R&D funding opportunities, including EU funding programs (Horizon Europe, LIFE, and national programs), and develop tailored funding strategies for clients - Design and manage energy efficiency projects from conception to implementation, including conducting energy audits, feasibility studies, and performance evaluations - Develop circular economy strategies and roadmaps for businesses, identifying opportunities for resource optimization and waste reduction.Provide technical consulting services for clients, translating complex regulatory requirements and sustainability frameworks into actionable business strategies - Create comprehensive technical proposals, reports, and documentation for funding applications and project deliverables - Engage and coordinate stakeholders from client organizations, authorities, and project partners.Monitor regulatory changes and new trends in energy efficiency and circular economy to support client recommendations - Collaborate with cross-functional teams in our Paris, Barcelona, and Madrid offices to ensure consistent service delivery and knowledge sharing - Analyze project data and performance metrics to evaluate outcomes and optimize future initiatives - Support business development activities by identifying new market opportunities and potential client relationships.

Join Our Mission to Transform Healthcare At Doctolib, we are on a mission to revolutionize the healthcare experience through cutting-edge technology. Our passionate tech team is dedicated to creating innovative products and features that enhance the daily lives of healthcare practitioners and their patients. Working in an agile environment, we collaborate closely with engineering, design, and business teams to achieve our goals. Your Role We are seeking a Senior Software Engineer to become a vital member of our Design System & Accessibility Team. Your contribution will be paramount in making Doctolib the leading digital and secure medical companion for patients. In our Platform domain, we focus on building and maintaining essential building blocks of our system with a "Platform as a Product" mindset. Our objective is to simplify the use of these complex components, allowing product teams to concentrate on their core mission: delivering faster solutions for healthcare professionals and patients. Why Your Work Matters: With a significant 80% of our traffic coming from mobile users, your role will be instrumental in bridging the gap between our Web and Mobile Design Systems, ensuring a seamless user experience across platforms. As part of the Frontend Platform team, you will empower all Doctolib Tech and Product teams to develop accessible, top-tier frontend applications. We achieve this by providing a robust web and mobile design system, creating supportive tooling, and offering guidance as Accessibility experts. Key Responsibilities: Design, build, and maintain a scalable web and mobile Design System using React and React Native to ensure consistent, accessible, and high-performance user experiences. Guide the convergence of Web and Mobile Design Systems, ensuring visual and functional consistency across React and React Native components. Develop and maintain React Native components for a seamless cross-platform experience. Mentor team members on React Native best practices, promoting a mobile-first culture within the Design System team. Collaborate with Product Designers to transform Figma designs into robust, reusable UI components, maintaining visual and functional parity between design and implementation. Advocate for accessibility (A11y), embedding inclusive design principles in our Design System and developing accessible components.

About UsHarmattan AI is at the forefront of innovation in defense technology, dedicated to developing autonomous and scalable systems that enhance national security. With a recent $200 million Series B funding round, our valuation has soared to $1.4 billion, prompting a significant expansion of our team and capabilities to deliver essential systems to allied forces.Our mission is driven by our core values: creating impactful technologies, striving for excellence, setting ambitious goals, and tackling complex technical challenges. We thrive in a high-pressure environment that demands rigor, accountability, and exceptional execution.About the RoleWe are seeking three Engineering Managers to join our Research & Development division in Paris, focusing on cultivating a robust engineering culture. This role is strictly managerial, aimed at leaders who find fulfillment in empowering high-performing teams rather than in personal technical achievements. You will report directly to our CTO and play a pivotal role in scaling our engineering practices, standardizing global processes, and alleviating leadership demands as we navigate a rapid growth phase.ResponsibilitiesPeople Management & Mentorship: Serve as a dedicated manager for engineers, overseeing their career development, training, and performance evaluations.Organizational Strategy: Contribute to the structural organization by optimizing modules and implementing necessary changes to align with the company's vision.Process Standardization: Develop and enhance work processes across software and electrical engineering teams to ensure high-quality outcomes while maintaining execution speed.Tooling Oversight: Oversee internal tooling requirements, making strategic decisions on whether to build or buy solutions to create the most productive environment for engineers.Recruitment Leadership: Lead the recruitment efforts to attract and hire top-tier talent that meets our high standards.Cross-Functional Collaboration: Collaborate closely with Module Leads, HR, and the CTO to maintain a holistic understanding of the organization's needs.Candidate RequirementsEducational Background: A strong academic background in an Engineering discipline.Technical Expertise: Proficiency in modern engineering practices and methodologies.

We are seeking a passionate and driven Research & Development Associate to join our dynamic team at Talan. In this role, you will be at the forefront of innovative research projects, contributing to groundbreaking solutions that impact various industries. You will collaborate with a talented group of professionals in a stimulating environment, fostering your growth and expertise in the field.Your responsibilities will include conducting experiments, analyzing data, and developing new methodologies to enhance our R&D initiatives. If you are eager to tackle challenges and make a significant contribution to our projects, we want to hear from you!

Located in the bustling heart of Paris, Winamax is revolutionizing the online gaming industry. As the leading poker and sports betting platform in France, we boast a community of 350,000 players and 600,000 bettors each month. Our presence extends to Spain, Germany, and soon, Italy and Portugal. We are committed to providing our players with an extraordinary experience that is technical, creative, and high-quality. Innovation, unity, and belonging are the core values that shape our unique and multicultural corporate culture.Are you ready to shape the future of gaming?From a technical perspective, Winamax offers:• A powerful and innovative gaming engine: dynamic game offering adaptation, highly configurable poker games, and fraud detection.• A distributed and scalable architecture designed for real-time processing of platform flows.• A modular platform that meets high availability and data security requirements, capable of managing heavy traffic.ABOUT THE POSITIONTo support Winamax’s growth and the increasing number of design projects, we are looking for a Fullstack Developer with a strong Back-End focus (Node, React).As part of the Operator team, you will design and develop applications for managing our online gaming operations, specifically within the payment vertical.Your responsibilities will include:• Integrating new partners and payment methods.• Maintaining and evolving existing code to ensure compliance with regulations (including PCI DSS standards).• Harmonizing and optimizing historical code for improved maintainability and performance.• Developing internal tools for the fraud prevention and customer support teams.Our preferred environment, ideally yours as well:• NodeJS, React, PHP• Object-oriented programming / TDD / DDD• MySQL, Relational model, stored procedures, triggers, integrity constraints

Join Theodo and Shape the Future of Digital ProductsSince 2009, Theodo has been supporting innovative companies in the design, development, and deployment of cutting-edge digital products. We leverage the best in technology combined with a Lean approach.Our unique methodology is grounded in three core principles:- We have developed recognized expertise in key technologies for product design and development;- At every stage of the project, our priority is to create value for our clients;- We recruit top digital talents and foster their ingenuity through a Lean approach.Theodo has experienced exceptional growth over the past 15 years, with a team of over 700 passionate Theodoers, primarily Software Engineers committed to technology and continuous improvement. As we grow, our organization has specialized into technology-focused entities (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industry-specific teams (Fintech, Govtech, Healthtech, Consumer Products). By 2025, Theodo aims to achieve €100M in revenue.Your Team:You will join a vibrant tech community of over 120 Theodoers: software engineers, tech leads, engineering managers, and architects, where you can exchange ideas, learn, and grow every day.At Theodo, our tech teams collaborate in project-based teams tailored to each client's needs. You will be part of a small team of 4 to 5 Theodoers, including Software Engineers, a Tech Lead, and a Product Manager. Together, you will work closely with clients, engaging in regular discussions to share updates, deepen understanding of their challenges, and evolve the product in alignment with user needs.Your Future Missions:As a Fullstack Software Engineer at Theodo, your mission will be to design and develop useful, high-performing, and sustainable digital products that address the challenges faced by our clients and their users.

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 innovative team at myjobcompany1 as a Front End Developer (H/F) where your skills will contribute to building dynamic and responsive web applications. We are looking for a passionate individual who thrives in a fast-paced environment and is eager to embrace new challenges.

Join the Luo TeamLuoPay is a rapidly expanding leader in the FX and cross-border payments sector in Africa. We empower African enterprises to expedite payments to their international suppliers with enhanced transparency and competitive edges over traditional methods.Having established ourselves as a prominent player in several markets in record time, we are eager to expand our engineering team and continue developing the financial infrastructure for FX and cross-border payments across Africa.Role OverviewAs a Senior Full Stack Engineer, you will be an integral part of a skilled team, contributing to a variety of internal tools and customer-facing products. Your innovations will support a payment infrastructure that handles millions of euros in transactions daily.This role demands a customer-oriented approach and the ability to effectively communicate with both technical and non-technical stakeholders to achieve robust technical solutions.Key ResponsibilitiesDeliver products to both customers and internal teams (payment operations, treasury management, FX trading, compliance).Develop web applications using React.Create user-friendly interface designs.Design and implement HTTP APIs using Golang.Utilize AI-driven development methodologies.Qualifications6+ years of experience in web product development.Proficient in building APIs using Golang, Typescript, or other statically typed languages.Experience working within a small, fast-paced technical team.A product-oriented mindset with a focus on customer needs.Strong written and verbal communication skills.Ability to assess trade-offs and balance effort with impact.Systems Developed at LuoPayPayment platforms for businesses in Africa.Internal tools for payment operators, treasury analysts, and FX traders.AI usage for OCR and invoice approvals.KYC onboarding processes.Anti-Money Laundering and Transaction Monitoring systems.Core Banking and Ledger Systems.Automated payout systems with banking partners.

At Joko, we empower consumers to shop smarter and revolutionize the shopping experience. Our mission is to help individuals make informed decisions, find exactly what they need, and ultimately save money.Founded in Paris, Joko is a certified B Corp tech company with a diverse team of over 90 talented professionals across Paris, Barcelona, New York, and beyond. With more than 5 million users benefiting from our services at over 10,000 merchants, we are changing the way people shop every day.Our innovative solutions range from cashback offers and automatic coupons to price alerts and carbon tracking. We are currently developing an AI-powered shopping assistant designed to help users discover the best products based on price, quality, and environmental impact.Having achieved profitability in our core market, we are now expanding our reach globally, with a strong emphasis on the US market. Join us on this exciting journey as we build the future of shopping! Engineering Team OverviewOur Engineering team thrives on tackling complex technical challenges with elegant solutions. By prioritizing product innovation and design, they are redefining the shopping experience. Their goal is to positively impact the daily lives of millions of users worldwide.As a Staff Mobile Engineer at Joko, you will play a pivotal role in shaping our mobile application. Collaborating closely with the Product team, you will be involved in the entire lifecycle of product development, from exploration and design to implementation and production deployment.Our Engineering team is rapidly growing, fostering continuous innovation across our product and technology stack to revolutionize the online shopping experience. ResponsibilitiesWe value ownership and impact at Joko. In your role as Staff Mobile Engineer, you will take charge of significant components of our mobile application, overseeing everything from technical design to delivery and ongoing enhancements.Mobile Architecture & Development: Contribute to the definition and evolution of our React Native architecture, while designing and developing scalable, maintainable, and high-performance features in our mobile application.Codebase Modernization: Gradually enhance our existing React Native codebase by integrating modern patterns, best practices, and platform capabilities, ensuring a balance between innovation and stability.

We are seeking a highly skilled Senior Front End Developer (h/f) to join our innovative team at myjobcompany1 in Paris. In this role, you will work on exciting projects, utilizing your expertise in modern front-end technologies to create engaging and user-friendly web applications.Your responsibilities will include collaborating with designers and backend developers, ensuring the technical feasibility of UI/UX designs, and optimizing applications for maximum speed and scalability. You will also have the opportunity to mentor junior developers and contribute to the overall growth of the team.

About UsAt CryptoNext Security, we are pioneers in the realm of deep technology, focusing on post-quantum cryptography. Our innovative solutions empower businesses and institutions to safeguard their data against the impending challenges posed by quantum computing. We proudly collaborate with prominent clients across sectors such as finance, defense, and telecommunications.Your Daily ResponsibilitiesCraft and implement dynamic user interfaces utilizing React for our advanced post-quantum cryptography products.Work collaboratively with Product and Backend teams to deliver a seamless and user-friendly experience.Enhance performance while ensuring cross-browser and cross-device compatibility.Integrate REST APIs to facilitate interaction with backend services.Engage in code reviews and uphold best practices, including unit testing, continuous integration, and comprehensive documentation.Propose enhancements to frontend architecture through technological upgrades and refactoring.Foster improvements in our products beyond your typical responsibilities.Adhere to our frontend team principles: “Done over perfect” / we prioritize speed: KISS, DRY (Don't Repeat Yourself), SOLID.Essential SkillsProficient in React / Next.js along with its ecosystem (React Hooks, Context API).Solid understanding of TypeScript and fundamental programming principles.Experience with modern UI libraries such as Tailwind or chadcn/ui.Proven track record in integrating REST APIs.Strong knowledge of frontend performance optimization and related tools (Webpack, Vite, Core Web Vitals).Familiarity with frontend testing frameworks like Jest, React Testing Library, and Cypress.Competence in Git, CI/CD pipelines, and DevOps for automated integration and deployment.Desirable SkillsExperience with gRPC.Understanding of secure coding practices and application security.Basic knowledge of cryptography and cybersecurity.Experience in a startup or deeptech environment.Join Our TeamYou will become a key member of our R&D team, collaborating closely with backend developers, product managers, and UX/UI designers. You will report to the team lead and work with various departments to develop high-performance, user-centric interfaces that align with our clients' needs.Application ProcessInitial conversation with our HR team to discuss your background and motivations.Technical interview to assess your skills and fit for the role.