Senior Back-End Engineer - EMEA (F/M/D)

Join our dynamic team as a Back-End Developer specializing in NodeJS. You will be responsible for developing and maintaining high-performance server-side applications. Collaborate with our front-end developers to integrate user-facing elements with server-side logic. Your role will also involve optimizing applications for maximum speed and scalability.

nexton is hiring a Back End Developer to join the team in Paris. This role centers on building and maintaining server-side services using Java, NodeJS, Kotlin, and AWS. What you will do Design, develop, and maintain back-end services for nexton applications Collaborate with colleagues across teams to deliver software solutions Support and enhance nexton's products through project contributions Key technologies Java NodeJS Kotlin AWS Location This position is based in Paris.

Join our dynamic team at myjobcompany1 as a Back End PHP Developer. You will work on exciting projects that contribute to our innovative software solutions. Your primary focus will be on designing and implementing server-side logic, ensuring high performance and responsiveness to requests from the front end.

Join our dynamic team at Sunrise United States Inc. as a Python Back-End Developer. We are seeking a talented developer who is passionate about crafting efficient, scalable code and creating innovative back-end solutions. If you thrive in a collaborative environment and have a strong understanding of Python and back-end technologies, this is the perfect opportunity for you!

Join our Digital Transformation team at altersolutions, where you will collaborate with a group of software development experts dedicated to supporting our clients.You will be assigned to a leading player in the Banking and Market Risk sector, working alongside a team of skilled developers.Your responsibilities will include:Enhancing the web application by adding new validation criteria for risk analysis and improving its usability.Modifying and evolving integration workflows.Developing a web service for the automatic update of all deals referenced in the application.Creating a Windows service to manage snapshots of financial indicator versions.Analyzing and resolving anomalies.Acting as a release manager.Facilitating production deployment.

Join our innovative team at nexton as a Back End Developer specializing in Scala. In this role, you will play a crucial part in designing and implementing robust backend systems that support our applications in the Telco, Media, and Transport sectors. You will collaborate with cross-functional teams to deliver scalable solutions and enhance system performance.

Octopus Energy is a bold initiative aimed at making energy greener, more affordable, and accessible to everyone by establishing the first truly digital energy provider. Although the project originated in the United Kingdom, it has expanded to France since 2022! By combining cutting-edge technology with talented individuals committed to our customers and the transition to renewable energy, we continue to bring this vision to life. In just three years, we've become the fifth largest energy supplier in France! Our mission? To provide cheaper and greener energy to all French citizens and offer practical solutions to accelerate the ecological transition. Currently, we are developing the next generation of products to expedite the shift to green energy. Whether it’s facilitating the transition to solar energy, electric vehicles, implementing smart pricing, or enhancing large-scale renewable energy production, we tackle some of the most complex challenges in the energy sector! All while being faster, more creative, and with one obsession in mind: customer satisfaction. As a member of the Octopus Tech team, you will enjoy significant autonomy, a wide variety of projects to work on, and the opportunity to shape products that make a real difference in people's everyday lives—reducing their bills, enabling a more sustainable lifestyle, and providing experiences they will truly appreciate. You will closely collaborate with Octopus teams in France, including marketing, operations, and data, as well as technical teams from other countries in the group . Most importantly, you will quickly see the impact of your work in the real world and with our customers. If this resonates with you, we would love to discuss it further. Within the OE Tech France team, you won’t just be coding: you will build the technological engine that makes green energy simple and intuitive for all French citizens. You will join a small, agile team structured for innovation, where seniority and collaboration are key:- A strong core: You will work daily with 1 Product Manager, 4 Frontend Developers, and 3 Backend Developers. The Backend team is primarily composed of senior profiles, allowing you to thrive in a demanding technical environment.- Synergy with Data : Our data-driven approach ensures that your contributions directly enhance our service quality and customer experience.

Located in the vibrant heart of Paris, Winamax is revolutionizing the online gaming industry. As a leading platform for poker and sports betting in France, we boast a community of over 350,000 players and 600,000 monthly bettors. Our services extend to Spain, Germany, and soon to Italy and Portugal. We pride ourselves on delivering an exceptional experience that is technical, creative, and of 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?Technically, Winamax offers:• A powerful and innovative gaming engine: dynamic game offer adjustments, highly configurable poker games, and fraud detection.• A distributed and scalable architecture designed for real-time processing of platform flows.• A modular platform adhering to high availability and data security constraints, capable of handling heavy traffic.ABOUT THE ROLEAs a member of the Poker team, you will play a key role in the design, implementation, and oversight of the microservices powering our poker platform.ROLE DESCRIPTION• Design of the platform architecture.• Development of highly available and scalable microservices.• Development of APIs and data models.• Writing unit and end-to-end tests, and running scenarios in real-world conditions.• Participating in team code reviews.• Deployment of applications on AWS.• Monitoring and optimization of the poker platform.• Documenting the architecture and poker services.• Collaborating with Front-End, Data, Infrastructure, Security teams, and project managers.Examples of projects include:• Creating a poker gateway with authentication, rate limiting, routing, and pub/sub (10K+ messages/second).• Implementing a registration microservice (1,000 registrations/second).PROFILE SOUGHTThe ideal candidate will possess the following qualities and skills:• Significant experience in developing Back-End services on high-traffic platforms (10K+ requests/second).• Proven experience with load balancing, high availability, scaling, caching, database, and storage challenges.• Proficiency in architectural best practices and microservices development.

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

Your Responsibilities :As a Java JEE Developer / Software Engineer (H/F), you will collaborate with an agile team to drive back-end or full-stack development for one of our esteemed clients, focusing on:Analyzing architecture to ensure improvements meet expectations.Developing analytical tools for delivered components.Creating new features on a new platform compatible with current architecture.Automating testing procedures.Additionally, you will be involved in:User demonstrations.Integration testing.Production delivery (coordinating with infrastructure and security teams).Web and server development (NGINX, Apache, Tomcat, ...).Production and operational deployment procedures.Continuous integration (Jenkins, GitLab, Bitbucket, ...).Continuous deployment (Ansible, AWX, Octopus, GitLab, ...).Creating and participating in test cases.

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.

Join Our Innovative TeamAt Equativ, we are dedicated to creating cutting-edge advertising technologies that help our clients achieve their digital business objectives. Our extensive platform processes over 3 million requests per second, resulting in more than 250 billion daily requests, all managed by a robust infrastructure of 3,000 servers, delivering responses in under 250 milliseconds.Our dynamic innovation team, located in Paris, Nantes, Bordeaux, Limoges, Krakow, and Berlin, consists of over 150 enthusiastic engineers who thrive in an Agile environment, tackling complex technical challenges head-on. Your RoleAs a Back-End Engineer on our Addressability team, you will collaborate with a talented group of back-end developers and data engineers to build and query a multi-billion entry ID Graph, integrate third-party data providers, and empower our customers and business teams with advanced targeting and reporting capabilities.What You Will Do Ingest and manage vast amounts of data in high-performance key-value stores.Execute millions of user data queries per second with minimal response times.Enhance our graph to improve speed and efficiency.Make informed design trade-offs between features and performance.

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 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.

In the context of streamlining our development processes, we are seeking a Senior Fullstack Developer (H/F).EnvironmentYou will join a close-knit technical team of about thirty individuals in a very warm and fun work atmosphere. You have the flexibility to choose the workspace setup that suits you best: it’s entirely up to you how you want to work!Required SkillsProficient in NodeJsExperience with ExpressJSFamiliarity with AWSKnowledge of AngularJs or VueJsExperience with MongoDB and PostgresUnderstanding of KubernetesProficient in Docker

Join our innovative team at Free2Move as a Lead Senior Fullstack Developer (H/F) to drive the industrialization of our development processes.EnvironmentYou will become an integral part of a dynamic technical team comprising around thirty talented individuals in a warm and enjoyable work atmosphere. You have the flexibility to choose your working setup: it's entirely up to you how you wish to work!Required SkillsNode.jsExpress.jsAWSAngular.js, Vue.jsMongoDB, PostgreSQLKubernetesDocker

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.

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.