Full Stack Software Engineer at infinit | Madrid

INFINIT is a fintech scale-up established in 2023, with operations spanning Europe and the Americas. The company develops AI-driven solutions for small and medium enterprises, integrating banking features to help businesses manage daily operations more efficiently. INFINIT aims to serve niche markets with tailored products that support client growth. Role overview The Automotive Stock Auditor is a full-time, remote position based in Madrid. This role serves as INFINIT’s representative across a national network of automotive dealers and requires frequent travel throughout Spain. What you will do Conduct on-site physical audits of financed vehicles at dealerships. Verify compliance with company requirements and identify potential collateral risks. Build and maintain strong relationships with dealer partners. Report directly to the Head of Servicing, balancing compliance responsibilities with relationship management. Requirements Based in Madrid, with the ability to travel regularly across Spain. Experience in compliance, auditing, or automotive dealership environments is valued. Strong interpersonal skills to foster reliable partnerships with dealers.

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 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 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.

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 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.

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 dynamic team at infinit as a Founder’s Associate specializing in Product Development. In this pivotal role, you will collaborate closely with the founder and other key stakeholders to shape innovative product strategies and drive development initiatives. This is an exceptional opportunity for individuals looking to immerse themselves in a fast-paced, entrepreneurial environment where your ideas will directly influence the product's success.

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 aircall, a leading unicorn in the customer communications space, revolutionizing how businesses engage with their customers through an AI-powered platform. With over 22,000 global clients, we merge voice, SMS, WhatsApp, and AI into a unified workspace that enhances team efficiency and customer satisfaction.Our mission is simple: empower teams to achieve more by working smarter. Our innovative AI Voice Agent automates routine calls, while AI Assist streamlines post-call tasks, and AI Assist Pro provides real-time insights to optimize performance. This results in increased revenue, quicker issue resolution, and scalable teams.Headquartered in Paris, with a robust presence in North America through our Seattle office, we also have teams in Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and our rapid growth is supported by top-tier investors and cutting-edge AI advancements across our offerings.Our Work Culture: At aircall, we prioritize customer focus, data-driven decision-making, and significant outcomes. We cherish ownership, continuous learning, and a sense of urgency. If you thrive in a collaborative and fast-paced environment where trust and impact are valued, you will fit right in.As a Software Engineer, you will play a pivotal role in designing, developing, deploying, and maintaining critical business features that enhance customer value. Your day-to-day will involve ensuring operational excellence, utilizing metrics, and adhering to best practices.Driven by quality, excellence, and agility, you will help elevate our delivery processes. Leveraging NodeJS and Typescript within our AWS-hosted environment, you will create resilient services that seamlessly integrate with essential customer tools such as CRM, Helpdesk, and E-Commerce platforms.

Join aircall, a leading AI-driven customer communication platform, as we innovate the way businesses interact with their customers. With over 22,000 companies relying on our services, we integrate voice, SMS, WhatsApp, and AI into a unified workspace designed to enhance efficiency and drive revenue.Our vision is simple yet powerful: empower teams to work smarter, not harder. With tools like our AI Voice Agent for automating routine calls and AI Assist Pro for real-time guidance, we ensure that our teams can achieve peak performance and fast resolutions.Headquartered in Paris, with a strong presence in North America and multiple offices including Madrid, London, and New York City, aircall is backed by top-tier investors and is rapidly evolving through AI innovation across various product lines.At aircall, you will be part of a dynamic and ambitious team focused on impactful results. We prioritize ownership, continuous learning, and agile practices. If you thrive in a collaborative and fast-paced environment, you will flourish here.We are seeking a dedicated and enthusiastic Senior Software Engineer to enhance our engineering department and contribute to our innovative projects.In this role, you will oversee the design, development, deployment, and maintenance of essential features that deliver significant value to our customers. You will champion operational excellence and best practices while mentoring your team and the wider engineering community.Your work will focus on elevating quality, excellence, and agility within our delivery processes. You will work primarily with NodeJS and Typescript, ensuring our solutions are effectively hosted on AWS.

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.

Welcome to Adyen! At Adyen, we revolutionize the financial technology landscape by providing a comprehensive suite of payment, data, and financial solutions. Our esteemed clients include industry giants like Meta, Uber, H&M, and Microsoft, solidifying our position as the go-to financial technology platform. We are driven by ambition and innovation in every aspect of our work. We believe in fostering a dynamic environment where talented individuals can thrive. Our culture encourages ownership, collaboration, and problem-solving amongst diverse teams facing unique technical challenges. Together, we develop ethical and innovative solutions that empower businesses to achieve their goals efficiently. About Our Financial Products: Adyen is expanding its horizons beyond payments, creating a comprehensive range of embedded financial services tailored for platforms, marketplaces, SaaS businesses, on-demand services, and crowdfunding initiatives. Our mission is to facilitate seamless global management of payments and financial services through cutting-edge API integrations and hosted solutions. Our innovative platform enables businesses to: Execute onboarding, verification, and compliance processes across diverse markets. Manage transactions and expedite payouts and bank transfers in preferred currencies. Provide value-added services such as capital lending and the issuance of payment cards and bank accounts. Our team is dedicated to developing the technology that underpins this unified platform, focusing on various critical areas. Your Role: Develop and maintain our high-performance distributed platform. Contribute to architectural design decisions ensuring our platform's scalability. Mentor and coach junior engineers, fostering a culture of feedback and continuous improvement. Collaborate with a diverse and inclusive team. Launch quickly and iterate frequently, impacting businesses and customers from day one. Identify and enhance platform components for greater robustness and scalability. Work across teams and time zones to drive initiatives, review code, and embrace constructive feedback.

Join our dynamic global team as a Software Engineer and take charge of the quality, development, and execution of our cutting-edge software products.As a key member of our technology department, you will collaborate with a talented and diverse group of professionals located worldwide, including cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to contribute to a thriving company and make an immediate impact, we want to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has played a crucial role in the company’s success for over a decade, delivering innovative technology and services that have significantly improved the experiences of our clients and colleagues. From optimizing workflows for our teams to developing the core services that power our GlobalLink platform, we create scalable client interfaces that empower users to navigate complex systems with ease.

Note: Only candidates located in Spain will be considered. Visa sponsorship is not available. Lynx Financial Crime Tech S.A develops AI-driven systems to detect and predict behavioral patterns in financial transactions. The team draws on backgrounds in both finance and academia, focusing on self-learning tools that support low-latency processing for clients in banking, fintech, and commercial sectors. Their solutions work across on-premises and cloud environments. The company values vision, agility, and speed, aiming to build trust with customers and encourage proactive risk management. Lynx supports diversity and equal opportunity, welcoming people from all backgrounds. Role overview This Madrid-based Software Engineer (Python) position centers on building and maintaining an AI-powered anti-money laundering (AML) tool. The platform relies on Big Data and real-time processing to deliver self-learning solutions for the financial sector. Main responsibilities Analyze requirements and contribute to solution design. Develop and maintain a cloud application for AML detection in financial environments. Assess system performance and identify areas for speed improvements. Conduct quality assurance testing to validate new features and changes. Create and manage test cases. Diagnose and resolve software issues. Promote best practices in the use of development repositories and tools.

Join the dynamic TransPerfect team as a Junior Software Engineer in Madrid, where you will play a pivotal role in ensuring the quality, development, and execution of our innovative software products.As part of our global technology department, you will collaborate with a diverse group of talented professionals situated in key locations such as Barcelona, New York, London, Manchester, Bucharest, and India. If you are eager to contribute to a rapidly growing company and make an immediate impact, we encourage you to apply!About TransPerfect TechOps:The TransPerfect TechOps team has been instrumental in our success for over a decade. We deliver cutting-edge technology solutions and services that greatly enhance the efficiency of our clients and colleagues. From streamlining workflows to developing essential services that underpin our GlobalLink platform, our mission is to create scalable client interfaces that empower users to navigate complex ecosystems effortlessly.

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

Join our dynamic global team as a Software Engineer, where you will play a crucial role in ensuring the quality, development, and implementation of our innovative software products. As part of a diverse technology department, you will collaborate with talented professionals from cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to contribute to a growing company and make a significant impact, we would love to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in our company's success for over a decade, delivering technology and services that have greatly enhanced the experiences of our clients and colleagues. From improving workflows for team members to developing core services that underpin our GlobalLink platform, we strive to create scalable client interfaces that make complex ecosystems accessible to everyone.