Senior Front-end Engineer - Platform

About LedgerAt Ledger, we are a team of innovators dedicated to redefining digital ownership. Our mission is to empower individuals and enterprises alike through secure management of their assets, ensuring that technology is accessible for everyone. We envision a future where users, creators, and businesses have full control over their value. Driven by curio…

Join our dynamic team at myjobcompany1 as a Senior Front-End Engineer (H/F)! In this role, you will play a crucial part in developing cutting-edge web applications that provide an outstanding user experience. You will collaborate closely with designers and backend developers to create seamless and responsive user interfaces. We are looking for innovative thinkers who are passionate about technology and eager to contribute to exciting projects.

nabla is looking for a Senior Front-End Engineer with deep experience in React to join the Paris office. This position centers on building web applications that are both dynamic and user-friendly, with a strong focus on delivering a polished user experience. Role overview Work closely with colleagues across disciplines to design, develop, and refine the front-end architecture. The goal is to ensure applications remain fast, responsive, and reliable. Day-to-day, expect to collaborate with product and design teams to translate ideas into seamless interfaces. What you will do Develop and optimize React-based web applications for performance and usability Work with cross-functional teams to implement new features and improvements Guide junior developers and help set coding standards, testing procedures, and deployment practices Impact This role shapes the quality of nabla’s products and directly influences customer satisfaction. Senior engineers here play a key part in mentoring others and establishing best practices across the front-end team.

Blockchain.com is at the forefront of revolutionizing the financial landscape through cryptocurrency. As the leading and fastest-growing global crypto company, we empower millions of individuals around the globe to access cryptocurrency securely. Since our inception in 2011, we have gained the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.We are on the hunt for a talented Front-End Engineer with a passion for crypto and Web3 technologies to join our dynamic engineering team. In this role, you will work on developing innovative Blockchain applications that are among the most popular in the crypto ecosystem. Your contributions will shape user interfaces that power future wallets, block explorers, financial and market data products, along with cutting-edge visualizations.Our engineering teams engage in all phases of the product life cycle, encompassing idea generation, design, prototyping, planning, execution, and deployment.

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.

Senior React Front-End Developer (All Genders) Why choose Valtech? We are the innovation leader in experience, a trusted partner to the world's most recognized brands. For our team members, we provide opportunities for growth, a culture grounded in values, international career prospects, and the chance to shape the future of customer experience. Opportunity At Valtech, you will find an environment conducive to continuous learning, tangible impact, and professional growth. Whether you're developing new digital solutions, challenging conventional wisdom, or crafting the next generation of customer experiences, your contributions will help transform industries. We take pride in: Our work and the innovation we foster Our values: 'Share, Dare, Care' A corporate culture that promotes creativity, diversity, and autonomy Our borderless global structure that facilitates seamless collaboration Role As a Senior React Front-End Developer (All Genders), you are passionate about innovation in experience and constantly seek to push the boundaries of what is possible. You bring 8 to 12 years of experience, a strong commitment to personal development, and a desire to make a lasting impact. You will join a multicultural, international, and multidisciplinary team dedicated to advancing the frontiers of technology and design.

Join ScorePlay, the leading AI media platform in sports dedicated to enhancing the connection between clubs, athletes, and fans. We collaborate with over 270 clubs, leagues, and federations, including prestigious names like Ligue 1, Premier League, NBA, NFL, Tour de France, Australian Open, UEFA, and FIBA. Our mission is to transform every significant moment, both on and off the field, into engaging content that strengthens community ties.Since our inception in 2021, our dynamic 45-member team has expanded rapidly, achieving a remarkable 3x growth year over year and an almost 100% retention rate. With over $20M raised from prominent investors, including Alexis Ohanian and elite athletes like Kevin Durant and Raphaël Varane, we are making significant strides in the sports media industry.If you have a passion for sports and thrive in a fast-paced work environment, we invite you to help us redefine how future generations experience sports. This is an exceptional opportunity to join a company poised to become the global leader in sports media. OverviewWe are seeking a talented Senior Back-end Engineer to become a pivotal member of our Video Production team, which is central to ScorePlay's innovative platform.In this role, you will take charge of the back-end services that drive our video processing and media automation systems, ensuring they are robust and efficient.This is a unique opportunity for an individual who desires autonomy and impact in their work, ready to take full responsibility for their projects while collaborating across product, video, and front-end teams. What You Will Work On:Backend DevelopmentDesign, develop, and maintain back-end services, APIs, and data pipelines using Go and related technologies.Monitor system performance and reliability to ensure scalable and maintainable solutions.Data & DatabasesDesign and optimize database schemas, queries, and indexing for efficient data storage and retrieval.

Located in the heart of Paris, we are transforming the online gaming industry. As the leader in poker and sports betting in France, with 350,000 players and 600,000 monthly bettors, we are expanding our presence in Spain, Germany, and soon in Italy and Portugal. We provide our players with an exceptional experience that is technical, creative, and qualitative. Innovation, unity, and belonging are the values that shape our multicultural and unique corporate culture.Are you ready to shape the future of gaming?Technically, Winamax offers:• A powerful and innovative gaming engine: dynamic adaptation of gaming offers, highly configurable poker games, fraud detection.• A distributed and scalable architecture designed to process real-time platform streams.• A modular platform subject to high availability and data security constraints, capable of handling large audiences.ABOUT THE POSITIONAs part of our Tech team, you will play an active role in developing the next generation of Winamax applications (desktop and mobile) and improving our cross-platform engine.This position is attached to the Poker Client team, which manages the development of poker game clients (iOS, Android, Windows, Mac, Linux, Web) as well as the distribution of Winamax applications on App Stores.As a Senior Front-End Developer, you will be responsible for:• Developing innovative features loved by thousands of players.• Producing robust code for real-time gambling applications (poker, sports betting).• Participating in strategic and cross-functional projects involving multidisciplinary teams.Depending on your profile, experience, and willingness, you may also help upskill junior team members.

About UsAt Harmattan AI, we are pioneering the creation of autonomous and scalable defense systems that cater to the needs of modern warfare. Following a successful $200M Series B funding round, our valuation has surged to $1.4 billion, prompting an expansion of our talented teams to deliver mission-critical solutions for allied forces.Our mission is driven by core values: developing technologies that create a tangible impact, striving for excellence in our pursuits, setting ambitious objectives, and tackling challenging technical hurdles. We thrive in a demanding environment where rigor, ownership, and execution are paramount.About the RoleWe are in search of a talented Front-End Engineer to become a vital member of our C2 Core team based in Paris. This role involves crafting the operator's interface for our tactical Command and Control (C2) system, focusing on the Human-Machine Interface (HMI) that connects operators with the battlefield.The context you'll be working in emphasizes the significance of managing cognitive load alongside software performance. The user interface you design will be operational on tactical PCs in the field, demanding real-time updates for the Common Operational Picture (COP), the ability to render multiple live video streams, and an intuitive interface for mission planning and fleet command.Key ResponsibilitiesCOP Visualization: Develop interactive maps and 2D/3D geospatial overlays to visualize real-time robot telemetry, sensor data, and mission routes.Real-Time Video Grid: Build a low-latency, robust video player interface capable of managing multiple streams without freezing the main UI thread.Mission Planning & Command: Create interactive tools enabling operators to establish waypoints, configure mission parameters, and issue real-time commands to the fleet.Performance Architecture: Design a state management system that can efficiently handle high-frequency data from the backend bus while preventing UI jitter or memory leaks.Collaborative Development: Collaborate closely with UX/UI designers, backend engineers, and mission planning algorithm developers to streamline workflows and minimize the number of clicks for operators.Optimization: Ensure the UI meets strict performance benchmarks, including consistent 60fps rendering, even during high-frequency map updates.

Join our dynamic team at myjobcompany1 as a Lead Front-End Developer. In this pivotal role, you will innovate and enhance our web applications, ensuring a seamless user experience. Collaborate with designers and back-end developers to create responsive, user-friendly interfaces that captivate our audience.

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.

citech is seeking a Consultant SRE with a focus on Mobile and Front-End technologies to join the team in Paris. This position is dedicated to enhancing the reliability and performance of user-facing applications. The role involves close collaboration with both technical and product teams, aiming to support the quality and stability of mobile and front-end projects. Key Responsibilities Collaborate with cross-functional teams to improve the reliability and performance of mobile and front-end systems. Implement Site Reliability Engineering (SRE) principles to ensure smooth and dependable user experiences. Promote and help maintain operational best practices within ongoing projects. Participate in technical discussions and contribute insights to foster continuous improvement. Location This role is based in Paris.

About the Role meilleurtaux is looking for a Lead Front-End Developer to guide the front-end team in Paris. This position focuses on building and improving user interfaces and shaping the company’s digital presence through modern frameworks and development practices. What You Will Do Lead and mentor front-end developers, supporting their technical growth Work closely with cross-functional teams to deliver high-quality products Contribute to strategic planning for front-end projects Promote best practices in front-end development Drive improvements to user experience across digital platforms Location This role is based in Paris.

Join our dynamic team as a Front-End Developer specializing in JavaScript and Angular. In this role, you will leverage your expertise to create engaging and responsive web applications, enhancing the user experience and driving innovation within our projects.You will collaborate with cross-functional teams to define, design, and ship new features, and be part of a vibrant development culture focused on continuous improvement and agile methodologies.

About NablaAt Nabla, we are a dynamic collective of entrepreneurs, clinicians, and engineers dedicated to reinvigorating the joy of practicing medicine.In collaboration with a community of innovative clinicians, we have leveraged cutting-edge machine learning to create Nabla: the premier AI assistant designed to restore the human connection in healthcare. By optimizing clinical documentation, Nabla empowers clinicians to prioritize what truly matters—their patients. Currently, over 85,000 clinicians from more than 130 healthcare organizations rely on Nabla to enhance their daily care delivery.We are embarking on an ambitious journey to integrate ambient listening, dictation, coding, and command functionalities into a proactive assistant that seamlessly streamlines both clinical and financial workflows.With a recent $70M Series C funding, we are expanding our team to build the next generation of clinical AI and enhance the lives of clinicians and patients worldwide.This is an exciting moment to join our mission!The Best of AI Serving HealthcareNabla’s remarkable success is a testament to three years of dedicated product development.Guided by former Meta AI Research engineers, our team has consistently envisioned how AI can transform healthcare delivery. Our Machine Learning team is at the forefront of utilizing the latest advancements to unlock AI’s full capabilities within the healthcare sector.Yann LeCun, Chief AI Scientist at Meta and Turing Award laureate, serves as an advisor for Nabla.Engineering Excellence at NablaAt Nabla, our engineering culture is agile, innovative, and deeply technical. Our teams encompass machine learning, native desktop applications, and platform infrastructure, working together to deliver AI reliably and at scale in clinical settings.Your TeamIn our organization, product development is a collaborative effort led by Engineering and Product, structured into cross-functional squads focusing on specific product areas. Each squad comprises product managers, designers, engineers of various specializations, and domain experts, functioning with high ownership. As a Senior Back-End Engineer, you will be an integral part of one of these squads, contributing from end to end to a specific product segment.What You'll DoIn your role as a Senior Back-End Engineer, you will be instrumental in scaling Nabla’s AI-powered healthcare platform. You will own key components of our back-end systems, closely collaborate with product and machine learning teams, and influence the technical direction of our projects.

Join Labelium as a Front-End Consultant Intern in the Media department, where you will play a crucial role in enhancing our digital marketing strategies. This internship provides an excellent opportunity for hands-on experience in front-end development and media strategy implementation. You will work closely with experienced professionals to gain insights into the advertising technology landscape and contribute to innovative projects.

Join Voodoo as a Senior Back-end Engineer to lead the development of Wizz, a dynamic social app for teens. Utilize your technical expertise to enhance our backend architecture, optimize scalability, and ensure performance for millions of users. Collaborate with cross-functional teams to shape the product vision and contribute to decision-making processes, making a tangible impact in the world of mobile applications.

At Joko, we empower consumers to shop smarter. Our mission is to transform the shopping experience, enabling individuals to discover exactly what they need, make informed choices, and save money.Established in Paris, Joko is a certified B Corp tech company with a diverse team of over 90 talented individuals across Paris, Barcelona, New York, and beyond. More than 5 million users benefit from our services daily at over 10,000 merchants.From cashback and automatic coupons to price alerts and carbon tracking, we continuously enhance our offerings to make shopping more intelligent. Currently, we are developing an AI-driven shopping assistant to help users identify the best products based on price, quality, and sustainability.With profitability achieved in our core market, we are now focused on scaling our operations globally, particularly in the United States.Join us on this exciting journey and help shape the future of shopping! Our Engineering TeamOur Engineering team thrives on tackling advanced technical challenges with innovative solutions. Committed to product innovation and design, they are defining the future of the shopping experience. Their goal is to positively influence the daily lives of millions of users around the globe.Software Engineers collaborate closely with the Product team, engaging in exploration, design, roadmap prioritization, implementation, and production deployment. We’ve seen that teams with engineers who have diverse skills and foster close collaboration with product teams can deliver exceptional and innovative user experiences.As our Engineering team expands rapidly, we are dedicated to innovating across all areas of our product and tech stack, empowering a revolution in online shopping. Your ResponsibilitiesAs we scale to over half a million active daily users with zero-downtime expectations, you, as our Senior Staff Platform Engineer, will spearhead and shape our platform initiatives. You will be our pioneering senior engineer in this domain, consolidating current efforts across the team into a structured, reliable, and high-impact platform that accelerates safe shipping.Infrastructure: Enhance our production infrastructure to ensure it is scalable and resilient, focusing on runtime reliability, capacity, and failure management, allowing us to grow swiftly while maintaining stability.Monitoring & Alerting: Develop top-tier observability systems to ensure proactive monitoring and alerting, significantly enhancing our operational capabilities.

About TeadsTeads is a premier omnichannel advertising platform dedicated to delivering impactful results for brand and performance advertisers across multiple screens. We prioritize significant business outcomes by harnessing predictive AI technology to seamlessly connect high-quality media, stunning brand creative, and contextually relevant addressability and measurement. Teads collaborates directly with over 10,000 publishers and 20,000 advertisers worldwide. Our headquarters are located in New York, with a global workforce of around 1,700 individuals across more than 30 countries.For further details, visit www.teads.com.Our Main Engineering Challenges at TeadsDevelop efficient and user-friendly web products utilized by thousands of users from the world's top publishers, advertisers, and agencies.Leverage a rich and diverse tech stack and system architecture to enhance performance, scalability, resilience, and cost efficiency, primarily using Scala and TypeScript.Operate in a high-traffic environment (2.2 billion users monthly, 100 billion events daily) with stringent low latency and high availability requirements (2 million requests per second, responses under 150 milliseconds).Manage large datasets with millisecond access times to compute a near real-time complex auction resolution algorithm (18 million predictions per second).Thrive in a fast-paced environment where we regularly collaborate with Product teams and adapt our Cloud infrastructure for new features and enhancements.

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.