Full Stack Software Engineer at infinit | Madrid

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 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.

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.

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.

Role overview SGS seeks a Senior .NET Full Stack Developer based in Madrid. This role centers on building and enhancing web applications that drive business objectives. The position requires hands-on work across both front-end and back-end, with a focus on delivering reliable, high-performance solutions throughout the software development lifecycle. What you will do Develop and maintain web applications using .NET and related frameworks Collaborate with cross-functional teams to design and implement solutions that meet business needs Improve application performance and uphold code quality standards Participate in all stages of the software development process, from initial planning through deployment Requirements Extensive experience in both front-end and back-end development Strong collaboration skills with both technical and non-technical colleagues Dedication to maintaining high standards in code quality and application performance

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.

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.

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.

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 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.

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.

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.

Join the Leader in Language Services and Technology!As a Business Development Manager within our AI Solutions group (DataForce), you will play a pivotal role in fostering new business relationships and serving as a strategic partner for our esteemed clientele. DataForce is a dynamic and burgeoning service dedicated to providing high-quality data for Human-Machine Interaction, catering to some of the world's most prestigious technology firms.Our department specializes in the collection, enrichment, and processing of training data for Machine Learning across various AI domains.As part of the TransPerfect family, the world's leading provider of language and technology solutions, we operate in over 100 cities globally and are committed to recruiting top talent worldwide.

Join the forefront of innovation at a global leader in language services and technology! We are seeking a dynamic Business Development Manager to cultivate new business partnerships and serve as a strategic ally within our AI Solutions division, DataForce.DataForce is an expanding segment dedicated to delivering high-quality data for Human-Machine Interaction to some of the world's most esteemed technology firms. Our team specializes in the collection, enhancement, and processing of training data essential for Machine Learning across various AI sectors.As part of the TransPerfect family, the largest provider of language and technology solutions globally, you will have the opportunity to work with a diverse team across over 100 international locations.Key Responsibilities:Identify and research potential clients in the target market to understand their business and technical requirements.Qualify and quantify opportunities, driving prospects from lead generation to successful closure.Ensure exceptional customer satisfaction and success.Draft and implement strategic business plans.Become a subject matter expert on our products, processes, and industry trends.Maintain detailed records of business opportunities using TransPerfect’s CRM system.Coordinate with production and technology teams across various time zones and cultures.Generate and manage profitable business deals.Track and manage KPIs, providing internal and client-facing status updates, including executive summaries on account health and opportunities.Participate in tradeshows and contribute to marketing efforts through case studies and social media engagement.Provide accurate weekly forecasts and daily reports.Assist in developing overall plans and budgets, ensuring financial health across assigned client engagements.Manage communications with stakeholders regarding business and accounts.Support training and adoption of technologies and services for both internal and client teams.

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.

Treatwell is seeking a Business Development Manager focused on payment solutions to join the team in Madrid. This role centers on expanding Treatwell's TPV/POS offering, blending new business acquisition with ongoing client relationship management. The position supports a strategic area of growth and involves both sales and post-sales activities, with an emphasis on nurturing existing accounts alongside generating new leads. Role overview The Business Development Manager will drive the integration and adoption of Treatwell’s payment solutions within the current client base and among new customers. The split is roughly 30% new business development and 70% account management, requiring both a consultative sales approach and a focus on long-term client success. What you will do Contribute to the development of commercial strategies for physical payment solutions. Grow sales of TPV/POS products by identifying and pursuing upsell and cross-sell opportunities with both new and existing clients. Advise clients on selecting the most suitable payment solutions for their needs. Share industry knowledge and best practices with colleagues and teams. Collaborate closely with internal teams, including Product, Sales, Account Management, Activation, and Marketing. Track performance metrics and relay feedback to the product team to support ongoing improvement. About Treatwell Treatwell is Europe’s largest beauty booking platform, working with more than 50,000 businesses across 13 countries and processing over 8 million bookings each month. The team includes over 700 professionals working together to digitize the hair and beauty industry.

Databricks is looking for a Solutions Architect in Madrid. This position centers on supporting customers as they use data and AI to address practical business needs. Role overview As a Solutions Architect, you will collaborate directly with clients. The goal is to design and implement data solutions that drive improvements across their organizations. Key focus areas Work with customers to understand their business challenges Apply data and AI tools to develop tailored solutions Help clients realize value from Databricks technology Location This role is based in Madrid, Spain.

About UsAt SectureLabs, we are a dedicated team of over 50 technology professionals passionate about delivering quality software, innovative products, and exceptional services to our clients. We are excited to announce the launch of a unique project that embodies the essence of Secture. For this role, we seek a talented individual eager to help develop and nurture our proprietary product. Given the early stages of this project, we prefer candidates who can work on-site in Madrid, as our offices are conveniently located near Marqués de Vadillo.If you are looking for a project or a team that values software quality, embraces best practices, and fosters a fantastic work environment, you are in the right place! Join us and become a part of a collaborative team where you can learn, have fun, and work alongside colleagues who share your passion.Discover more about us at: www.Secture.comOur Team & CultureWe come from diverse technological backgrounds, accustomed to working with agile methodologies, fostering asynchronous communication, and enjoying the freedom and flexibility they provide. This project is still in its early stage, so if you love building and want to contribute your skills to a new venture, we are looking for you! Our small yet tightly-knit team is eager to collaborate and grow our product together.At Secture, we prioritize the well-being of our team, our workplace atmosphere, and our company culture. We are searching for team members who share our values and actively seek a supportive and engaging environment.