Experienced .Net / React JS Developer H/F

Join CAPFI Technology - a Hub of IT and Financial ExpertiseCAPFI Technology, located in Paris and London, combines our expertise in IT and market finance. Our consultants collaborate with clients on strategic projects that integrate innovation, technology, and financial challenges. Your Responsibilities :As a .NET Developer / Software Engineer (H/F), you will be part of an agile team working with a financial market client on:Developing containerized full-stack applications and micro-services while adhering to Craftsman practices (TDD, BDD, DDD).Analyzing architecture to identify improvements.Designing and developing .NET applications.Implementing continuous integration via automated tests (Jenkins, GitLab, Bitbucket, etc.) and continuous deployment (Ansible, AWX, Octopus, GitLab, etc.).Managing versions (Git, TFS).Creating test plans and participating in tests not covered by unit tests. Your Strengths :A passion for thriving in a demanding and enriching environment.A desire to challenge yourself in client missions.Curiosity, passion, and a collaborative spirit.A strong interest in management and a willingness to mentor peers.Solid technical or functional skills in market finance.A degree from an engineering school or equivalent, with at least three years of experience in IT. What We Offer You:CAPFI is a vibrant company that places collective spirit and peer sharing at the heart of its culture. We provide a flexible work environment with agile project choices. CAPFI also offers:Freedom to choose your manager.Opportunities for certified training.The chance to join Tribes and foster the collective energy and expertise of CAPFI.

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 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.

Role Overview Talan is hiring a .NET Developer with full stack experience and strong Azure DevOps skills for its Paris office. This position involves designing, building, and deploying software solutions that support client operations. The role works within an agile framework and involves close collaboration with colleagues from various disciplines to deliver reliable products.

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.

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.

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.

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

Role Overview Talan is seeking a C# / .NET Developer with experience in market finance to support and improve our financial systems. This role is based in Paris and focuses on building and maintaining solutions that help drive our business forward. What You Will Do Develop and optimize financial applications using C# and .NET technologies Work closely with team members to deliver reliable, high-quality code Contribute ideas to strengthen system performance and stability Help troubleshoot and resolve technical issues within our market finance platforms Who We’re Looking For Solid experience with C# and .NET development Background in market finance or financial systems Attention to detail and a collaborative mindset Based in Paris or able to work on site

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!

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 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 dynamic team as a Senior .NET Developer (H/F) where you will play a pivotal role in crafting high-quality software solutions. You will collaborate with cross-functional teams to design, develop, and maintain applications that meet our clients' needs. If you have a passion for technology and a knack for problem-solving, we want to hear from you!

Join our dynamic team at Magellan Partners as a Full Stack Java Developer! In this role, you will be responsible for designing, developing, and maintaining innovative software applications using Java technologies. You will work collaboratively with cross-functional teams to deliver high-quality solutions that meet our clients' needs.As a Full Stack Developer, you will leverage your expertise in both front-end and back-end development to create user-friendly applications. This is an exciting opportunity to enhance your skills and contribute to impactful projects in a fast-paced environment.

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;

Company Overview:Tessan is a fast-growing French startup specializing in telemedicine, dedicated to combating medical deserts across France. With over 1,500 devices deployed in less than six years, our mission is to ensure that every French citizen can access a doctor within 15 minutes of their home.We are expanding our team to support our product growth and accelerate our technological projects in web, mobile, data, and AI solutions. We are looking for a Full Stack Developer Intern (H/F) to join our technical team and actively contribute to the development of our digital solutions.Key Responsibilities:In a context of rapid product growth and technological innovation, you will participate in developing and enhancing our applications and services. You will collaborate with the technical team on various topics ranging from product development to optimizing our data and AI tools.1) Product Development (Web & Mobile)Engage in continuous development of the Tessan mobile and web applicationsContribute to the creation of new features (front-end & back-end)Assist in bug fixing and ongoing improvements of the applications2) Service Maintenance & ImprovementParticipate in maintaining the backend services and APIsContribute to enhancing performance and stability of servicesHelp establish best development practices (testing, code quality, documentation)3) Optimization & AutomationAssist in optimizing technical and operational processesParticipate in automating workflows (data handling, synchronization, processing)Utilize AI tools to improve productivity and development efficiency4) CI/CD, Deployment & IndustrializationContribute to improving CI/CD pipelinesAssist in deploying and industrializing new projectsHelp implement monitoring tools and service tracking5) Architecture & Technical ProjectsEngage in architectural discussions (mobile, web, backend)Enhance skills on technical choices and best development practicesContribute to data-related projects, data pipeline, and topics around Big Data and AI as projects progress6) Cross-Department CollaborationWork collaboratively with product, operations, and business teamsParticipate in technical discussions and progress meetings with the team

As a Tech Lead at CAPFI Technology, you will embark on two primary missions: Develop containerized full stack applications and microservices, adhering to Craftsman practices (TDD, BDD, DDD).Analyze architecture for improvement assessments.Design and develop .NET applications.Implement continuous integration through automated testing (Jenkins, GitLab, Bitbucket, etc.) and continuous deployment (Ansible, AWX, Octopus, GitLab, etc.).Manage version control (Git, TFS), create test plans, and participate in tests not covered by unit tests. You are the right candidate if: You are eager to challenge yourself in a rich and demanding environment.You are curious, organized, and passionate about finance and/or IT.You possess technical (SQL) and/or functional knowledge in financial markets.You hold a degree from an engineering school, business school, or equivalent.You wish to evolve in contexts driven by Agile ceremonies.You have strong interpersonal skills and enjoy teamwork.You are looking to thrive in English-speaking environments. What we offer you CAPFI is a vibrant company that...

Join Alten as a Full Stack Developer specializing in Vue.js and PHP Laravel. We are seeking passionate developers who thrive in innovative environments. You will work on exciting projects that challenge your skills and allow you to grow professionally.