Senior .NET Full Stack Developer

Join Yopeso, a leading software development company with over 20 years of experience in delivering innovative software solutions, ranging from large-scale applications to niche products. Our dynamic team of more than 300 professionals across five locations is deeply committed to cultivating an environment of growth, transparency, and professionalism.At Yopeso, we embrace values such as authenticity, curiosity, and ambition. These principles empower us to forge robust connections within our community and with our partners, ensuring trust, integrity, and transparency in all our endeavors. We continuously challenge ourselves to develop high-quality, high-performance, and secure software solutions that meet the evolving needs of our clients.Our collaborative and agile approach enables passionate professionals to work efficiently in teams, focusing on creating impactful products that resonate with our authentic selves.

Yopeso brings nearly two decades of experience in software development, building both large-scale systems and tailored products. The company employs more than 300 professionals across five global locations, with a steady focus on growth, transparency, and professionalism throughout each project. Authenticity, curiosity, and ambition shape daily work at Yopeso. Teams operate with trust and integrity, maintaining open communication and a commitment to secure, reliable software. Each project emphasizes high quality and dependable performance. Collaboration plays a central role. Agile teams share knowledge and support one another, working efficiently to deliver software that aligns with the company’s core values and meets real-world needs.

Join causaprima as a Senior Full-Stack Engineer, where your expertise will shape engaging interfaces for our agents. You will develop intuitive dashboards, approval workflows, real-time data visualizations, and a counterparty portal that enhances connectivity across our network.Your ResponsibilitiesReal-Time Communication & Architecture — Implement WebSocket-driven event streaming, agent notification routing, and dynamic query management.Visualizing Financial Forecasts — Create probabilistic cash forecasts with uncertainty bands and detailed insights into invoices and assumptions.Counterparty Portal Development — Build a user-friendly portal for suppliers and customers to track invoice statuses, manage disputes, and view payment commitments securely.Approval Interface Design — Craft a human-in-the-loop interface for reviewing agent reasoning and verifying source documents before action approvals.Session Management & Authentication — Integrate OAuth 2.0 / OIDC, manage JWT with tenant context, and handle session lifecycles with Redis, including magic link token generation for the counterparty portal.API/BFF Layer Development — Develop a TypeScript service layer to mediate between the React frontend and the Python agent backend, securing REST, GraphQL, and WebSocket endpoints.MCP Server Implementation — Establish a Model Context Protocol endpoint for integrating external AI agents, facilitating interoperability across the supply chain.Qualifications5+ years of experience architecting TypeScript/React applications in production environments.Strong systems design skills, with a focus on components, contracts, data flows, and failure modes.Extensive experience in real-time architectures, including WebSockets and event-driven frontends.Proven ability in designing data visualization systems and API layers for multi-tenant SaaS applications.Solid understanding of frontend security practices, including CSP, CSRF, session management, and input sanitization.Proficient in using AI coding tools with strong code review capabilities to ensure secure outputs.Possess a strong product sense, making data-backed recommendations and articulating opinions effectively.

ResilientCo is looking for a Full Stack Engineer in Madrid to help build and improve applications across both front-end and back-end systems. This position involves working closely with colleagues from different areas to deliver projects that support the company's technology goals. Role overview This role focuses on developing features and maintaining systems that serve users and internal teams. Expect to contribute to both user interfaces and server-side logic as part of a collaborative group. Collaboration Full Stack Engineers at ResilientCo participate in team discussions and planning, sharing ideas to improve how applications look and function. Working with designers, product managers, and other engineers is a regular part of the job. Location This position is based in Madrid.

Role overview SGS is looking for a Java Full-Stack Developer to join the team in Madrid. The position covers both front-end and back-end development, supporting the creation and maintenance of software solutions. Success in this role depends on practical experience and clear communication with colleagues from various areas. What you will do Develop and maintain applications using Java along with modern web technologies Work alongside team members from different disciplines to achieve project objectives Help design, implement, and refine software solutions Requirements Strong experience with Java Proficiency in current web development frameworks and tools Comfort working collaboratively within a team This is an on-site role based in Madrid.

Join Groupon, a leading marketplace where customers explore new experiences and services daily, and where local businesses thrive. We have partnered with over a million merchants worldwide, connecting more than 16 million customers with deals across diverse categories. In a landscape often dominated by e-commerce giants, Groupon stands out as one of the few platforms genuinely committed to propelling local businesses forward based on performance.We are on an exciting journey to radically transform our business through a relentless focus on results. Despite having thousands of employees across multiple continents, we foster a culture that inspires innovation, rewards risk-taking, and celebrates success. Here, your impact can be immediate due to our scale and the rapid pace of our transformation. We blend the best of both worlds: we have the resources and scale of a large company, yet we empower individuals to have significant autonomy and drive meaningful change.About the RoleHybrid from Madrid or ValenciaAs a Full Stack AI Engineer, you will engineer the foundation of our proprietary internal platform that democratizes AI across the organization. This role goes beyond standard full-stack duties; you will construct the framework that enables various teams to develop autonomous AI agents. Your responsibilities will include designing reasoning flows, integration layers, and agent logic that empower AI to execute complex business tasks at scale. This is applied AI engineering: focusing on sophisticated system design and relentless execution rather than model fine-tuning. You will collaborate daily with a newly formed team of engineers and work closely with the AIGO team and cross-functional partners across Global Operations, Customer Satisfaction, and Engineering.

Role Overview Miratech is hiring a Senior Full Stack Developer in Madrid with expertise in Java and Angular. This position focuses on building and maintaining complex web applications that serve a range of client needs. What You Will Do Design, develop, and maintain web applications using Java and Angular Work closely with cross-functional teams to deliver software solutions Support the full software development lifecycle, from concept through deployment Location Madrid

Join Our Team:At INFINIT, we are seeking a talented Full Stack Software Engineer to be an integral part of our dynamic product development team. You will play a crucial role in transforming business objectives into tangible, high-quality software solutions.About Us:Founded in 2023, INFINIT is a rapidly expanding fintech scale-up with operations across Europe and the Americas. We are committed to revolutionizing the SME sector through cutting-edge AI technology. Our comprehensive operating system centers around banking, equipping small business owners and their teams with the tools they need to efficiently manage and enhance their operations.By focusing on niche industries, INFINIT provides customized, high-impact solutions while innovating AI-driven products that unlock substantial growth for our clients. Our ambitions are global, aiming to redefine the fintech landscape for SMEs worldwide.Embark on the INFINIT journey as we reshape the SME economy and create meaningful change through innovation!

Join our dynamic team at thebridge3 as a Lead Full Stack Instructor. In this pivotal role, you'll be responsible for guiding students through comprehensive full stack development courses, leveraging your expertise to foster a collaborative and innovative learning environment. Our instructors are passionate about technology and committed to equipping the next generation of developers with the skills necessary for success in the tech industry.

Role overview psicro seeks a Full-stack Developer in Madrid to support the development of AI-driven software products. This position covers both front-end and back-end responsibilities, contributing throughout the software development lifecycle. What you will do Build and maintain features for AI solutions, handling both client-side and server-side tasks Work closely with colleagues from various backgrounds to deliver dependable software Turn client requirements into scalable, maintainable technical solutions Requirements Background with modern web technologies and frameworks Strong teamwork and clear communication skills Interest in artificial intelligence and its real-world uses This role is located in Madrid.

Groupon, Inc. is seeking an AI Full-Stack Developer to join the team in either Madrid or Prague. The position centers on building and integrating artificial intelligence features throughout the technology stack, helping connect millions of consumers with local businesses around the globe. Key responsibilities Design and implement solutions that incorporate AI technologies into both front-end and back-end systems Collaborate with fellow developers to achieve seamless integration and dependable performance Suggest and develop improvements that enhance user experiences and make business operations more efficient through artificial intelligence Location This role is based in Madrid or Prague.

Join our dynamic team at Aircall as a Senior Frontend Engineer in our Madrid office! We are searching for a talented engineer who is passionate about building high-quality, scalable web applications. In this role, you will collaborate with cross-functional teams to deliver exceptional user experiences and contribute to our innovative product development efforts.

Join the innovative team at thebridge3 as a Lead Instructor for Full Stack Development. In this part-time position, you will play a crucial role in shaping the next generation of developers by delivering engaging and comprehensive instruction in full stack technologies. You will leverage your expertise to create a dynamic learning environment that fosters student success and encourages hands-on experience.

Key Responsibilities- Design the architecture of web pages based on provided layouts.- Develop reusable code for future projects.- Implement mobile-first design principles to ensure optimal user experience on smartphones.- Monitor and enhance website performance for speed and scalability.- Exhibit self-management skills and effectively prioritize tasks.Essential Qualifications- Proficiency in Laravel, PHP, MySQL, HTML5, CSS3, JavaScript, Sass, Git, VueJS, and TailwindCSS.- Minimum of 3-5 years of proven experience in PHP Laravel, HTML, CSS, and JavaScript development.- Deep understanding of SCSS and Blade templates (Laravel).- Familiarity with VueJS, AMP, and TailwindCSS is preferred.- Experience in responsive and adaptive design methodologies.- Knowledge of SEO best practices.- Proven experience with collaborative version control systems.- Background in an agile team environment.- Excellent English communication skills, both verbal and written.- Strong grasp of Object-Oriented design principles and methodologies.- Experience with databases, including relational and NoSQL databases.- Competence in integrating third-party APIs and libraries.- Experience with search servers (e.g., Elastic or Algolia) is a plus, but not mandatory.- If you have a GitHub account or have contributed to open-source projects, we'd love to hear about it in your cover letter.

We are seeking a talented Full Stack Developer with expertise in .NET and Angular to join our dynamic team at Sopra Steria. In this role, you will work on diverse projects in the Telco, Energy, and Utilities sectors, contributing to innovative solutions that drive our clients' success.As a Full Stack Developer, you will be responsible for designing, developing, and maintaining web applications, collaborating closely with cross-functional teams to deliver high-quality software solutions.

Role overview SGS is seeking a DevOps Engineer to join the team in Madrid. The main focus of this role is to enhance continuous integration and deployment processes, aiming to make software delivery more reliable and efficient. What you will do Collaborate with colleagues from various departments to help achieve project objectives Automate tasks and processes to improve workflow efficiency Implement and maintain best practices for managing cloud infrastructure Who we’re looking for Engineers who enjoy solving problems and have a genuine interest in technology Team players who like working together and contributing to the success of projects This position is located in Madrid.

Join Aircall, a unicorn and AI-driven customer communications platform, trusted by over 22,000 companies globally to enhance revenue, resolve issues swiftly, and expand customer-facing teams. We are revolutionizing customer communications by integrating voice, SMS, WhatsApp, and AI into a cohesive workspace.Our drive stems from a straightforward principle: empower teams to work smarter, not harder. Our AI Voice Agent automates routine calls, AI Assist simplifies post-call tasks, and AI Assist Pro offers real-time guidance, enabling individuals to excel in their roles. The outcome? Increased revenue, expedited resolutions, and teams that scale with assurance.Headquartered in Paris with a robust North American base in Seattle, Aircall also has teams in Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We pride ourselves on building a product that delights customers and a rapidly growing business, supported by top-tier investors and propelled by swift AI advancements across various product lines.At Aircall, you will become part of a dynamic company. We are ambitious, product-focused, and execution-oriented, fostering visible impact, rapid decision-making, and authentic growth.Our Work Culture at Aircall: We prioritize customer satisfaction, leverage data, and strive for meaningful outcomes. We cherish ownership, ongoing learning, and thoughtful speed. If you thrive in a collaborative, fast-paced atmosphere where trust and impact are paramount, you'll feel right at home.We are in search of an enthusiastic and dedicated Staff Engineer to join our expanding engineering team and serve as a technical leader across various engineering groups.In this role as a Staff Engineer, you will drive influence across teams and domains, lead the delivery of solutions on cross-functional and strategic projects, and act as a technical leader within the engineering organization. You will uphold quality standards and promote the adoption of best practices in architecture, security, and DevOps.Quality, excellence, and agility are the cornerstones of our delivery processes, and you will help elevate these standards. Proficient in NodeJS and Typescript back-end stacks, tailored to each requirement, you will always ensure optimal hosting solutions.

At SGS, we are committed to hiring top professionals who embody integrity, curiosity, excellence, respect, inclusion, and collaboration. Our unique culture sets us apart. Are you ready to be part of a leading company in the aviation sector?Launch your aviation career with us!We are currently seeking a CAMO Engineer to join our team in Madrid:Your responsibilities will include:Providing support for Structural Engineering projects (Damage Maps, repairs, materials, damage assessment…)Assisting in CAMO Engineering projects (ADs, SBs, Records, Planning & Maintenance Tasks, Powerplant,...)Managing Aircraft Transition ProjectsUndertaking additional tasks related to aviation quality management

lastminute.com is looking for a Data Engineer to join its Madrid office. This position centers on building and maintaining data pipelines that support analytics and business decisions across the company. Role overview The Data Engineer will design, implement, and support scalable systems to collect and process data. The work ensures that reliable, high-quality data is available for teams who analyze trends and guide travel-related decisions. What you will do Design and develop data pipelines that move and transform information efficiently Maintain and monitor existing data systems to guarantee their performance and reliability Support analytics by making sure data is accurate and accessible for reporting and insights Location This role is based in Madrid.