Lead Full-Stack Developer at Reaktor | Lisbon

Join Sixt as a Full Stack Engineer specializing in Java and React! We are looking for a talented individual to contribute to our innovative tech team in Lisbon. In this role, you will work on exciting projects, develop cutting-edge applications, and collaborate with cross-functional teams to deliver exceptional digital solutions.

Join inetum2 as a talented Java Full Stack Developer where you will work in a dynamic team environment. Your expertise in Java and full stack development will be crucial in delivering innovative software solutions to our clients. You will collaborate with cross-functional teams to enhance our products and services, contributing to the entire software development lifecycle.

Join our dynamic team at inetum2 as a Senior Java Full Stack Developer. In this pivotal role, you will leverage your extensive knowledge of Java and full-stack development to design, implement, and maintain high-quality software solutions. Collaborate with cross-functional teams to deliver robust applications that meet our clients' needs, while ensuring a seamless user experience.

Join our innovative team at inetum2 as a Full-Stack Developer. In this dynamic role, you will leverage your expertise in React and .NET to develop robust web applications that enhance user experience and drive business success. Collaborate with cross-functional teams to design, implement, and maintain high-quality software solutions.

Join our dynamic team at Altersolutions as a Senior Full Stack Developer specializing in Java and Angular. In this role, you will be responsible for developing and maintaining our cutting-edge web applications, collaborating closely with cross-functional teams to deliver high-quality software solutions. Your expertise will help drive innovation and enhance user experiences.

About Us At Riskified, we empower businesses to achieve ecommerce growth by mitigating risks. Our platform is trusted by some of the world’s most prestigious brands and publicly traded companies, offering guaranteed protection against chargebacks, combating fraud and policy abuse on a large scale, and enhancing customer retention. Our AI-driven fraud and risk intelligence platform is developed and managed by an extensive team of ecommerce risk analysts, data scientists, and researchers, analyzing each interaction to deliver real-time decisions and comprehensive identity-based insights. We proudly partner with remarkable companies across various industries, including Acer, Gucci, Lorna Jane, GoPro, and many more. We thrive in a collaborative environment, working alongside talented individuals to create and improve products that genuinely matter. The opportunities to innovate and contribute give us a sense of purpose, creating a lasting impact and motivating us to choose Riskified every day. About the Role As a Senior Full-Stack Engineer in Riskified’s Core Services Group, you will be responsible for designing, building, and maintaining end-to-end applications using diverse technologies. Working in a fast-paced, agile environment with cutting-edge tools, you will play a key role in expanding Riskified’s ecosystem. Our developers take full ownership of their work, from feature planning with Product and Design teams to technology selection, architectural design, coding, code reviews, deployment in a CI/CD environment, and ongoing monitoring post-deployment. The team primarily focuses on customer-facing applications, including a core web tool that enables merchants to review orders, take actions, and gain insights through advanced analytics. You will have the opportunity to engage in all aspects of development, whether that involves crafting precise UI, developing robust backend logic, or optimizing infrastructure for scalability. Our Technology Stack: Scala, Spark, Node.js, Ruby, React, Postgres, Elastic, Redis, AWS, Kafka, Docker, Kubernetes, CircleCI, and more. Your Responsibilities Design and develop a highly reliable, available, and scalable architecture for our core services and web applications in a promising new product. Deploy your code to production daily using advanced CI/CD pipelines. Actively manage production systems to ensure smooth operation. Contribute to planning the team roadmap and product development. Collaborate with design and product teams to define and implement new features.

About Relay Commerce Relay Commerce is a leading e-commerce enablement platform providing innovative scaling solutions tailored for personalized messaging, social commerce, and customer retention strategies. We empower merchants to thrive in an ever-changing digital marketplace with our cutting-edge suite of tools. Currently, our solutions facilitate over $1 billion in incremental gross merchandise volume for more than 35,000 merchants worldwide. Our ecosystem features eight advanced software products designed to enhance merchant revenue growth through email marketing automation, conversion optimization, user-generated content management, retention analytics, and subscription management. Relay's products are recognized as essential revenue-generating tools for forward-thinking e-commerce merchants across the globe. Role Overview In this pivotal role as a Full-stack Software Engineer, you will primarily focus on back-end development (approximately 70% of your time) by creating robust TypeScript services that drive subscription management, billing workflows, and merchant-facing APIs for Shopify stores handling millions of transactions. You will work collaboratively within a team, independently delivering features while collaborating with a seasoned team lead to propose solutions, implement them, and oversee their operation in production. It is crucial that these systems maintain high reliability, observability, maintainability, and performance. Utilization of AI tools such as Claude code and Codex will enable you to accelerate feature delivery effectively. Additionally, you will contribute to our React-based front-ends (approximately 30%) in a dynamic, multi-functional team environment. About Smartrr Smartrr, a subsidiary of Relay Commerce, is a frontrunner in subscription solutions tailored for e-commerce brands. Our platform empowers numerous Shopify merchants to effortlessly launch, manage, and scale their subscription and loyalty programs. Smartrr has facilitated over $300 million in transaction volume, significantly strengthening customer relationships and brand profitability.

About Us At Riskified, we empower businesses to drive eCommerce growth by eliminating risk. Our solutions are trusted by some of the world’s leading brands and publicly traded companies in the online space, providing guaranteed protection against chargebacks, fraud, and policy abuse while enhancing customer retention. Our AI-driven fraud and risk intelligence platform, managed by a robust team of eCommerce risk analysts, data scientists, and researchers, delivers real-time insights and decisions based on individual user interactions. We proudly partner with exceptional companies across various industries, including Acer, Gucci, Lorna Jane, GoPro, and many others. We thrive in a collaborative environment, working alongside talented individuals to create and enhance impactful products. The opportunities to innovate and contribute give us a profound sense of purpose, making our work at Riskified truly meaningful. About the Role As a Full-Stack Engineer in Riskified’s Core Services Group, you will develop and maintain end-to-end applications using a variety of technologies. In this dynamic, agile environment, you will play a crucial role in expanding Riskified’s ecosystem. Our engineers take full responsibility for their work, from feature planning with Product and Design teams to selecting technologies, designing architecture, coding, reviewing, deploying in a CI/CD environment, and monitoring performance post-deployment. You will work on customer-facing applications, including a core web tool that enables merchants to analyze orders, take actions, and gain insights through advanced analytics. Whether you are creating precise user interfaces, developing resilient backend logic, or optimizing infrastructure for scalability, you will be engaged in all aspects of the development process. Our Technology Stack: Scala, Spark, Node.js, Ruby, React, Postgres, Elastic, Redis, AWS, Kafka, Docker, Kubernetes, CircleCI, and much more. What You'll Be Doing Design and build a highly reliable, available, and scalable architecture for our core services and web applications in a new, promising product. Deploy code to production daily through our advanced CI/CD pipelines. Actively maintain production systems to ensure smooth operations. Contribute to planning the team roadmap and product features. Collaborate with design and product teams to define and implement new features. Qualifications B.Sc. in Computer Science or equivalent certifications. 3+ years of proven experience in full-stack development. Strong familiarity with various programming languages and frameworks. Excellent problem-solving skills and a passion for technology. Ability to work collaboratively in a fast-paced environment.

As a Senior Full-Stack Software Engineer at Inetum, you will join a globally distributed team of developers dedicated to crafting innovative software solutions. Your role will involve collaborating with diverse teams across various regions to create scalable, secure, and efficient applications that align with both business objectives and technical standards.Key Responsibilities:Architect and implement robust full-stack applications following best practices and technology roadmaps.Engage in requirement analysis, design solutions, and contribute to system architecture discussions.Develop and enhance user-centric front-end interfaces and back-end services.Work closely with cross-functional teams to ensure seamless integration, testing, and deployment.Drive improvements in software design, fostering functional and technical excellence.Conduct comprehensive integration tests and User Acceptance Testing (UAT) to maintain high quality.Collaborate with central teams to uphold secure coding practices and robust Software Development Life Cycle (SDLC) processes.Champion SDLC best practices, with a focus on automation, CI/CD pipelines, and streamlined deployments.Mentor team members and advocate for code quality through regular code reviews and adherence to development standards.Embrace new technologies, frameworks, and methodologies to enhance productivity.Facilitate efficient support collaboration with relevant IT teams, particularly in Production Support (APS).

Join the dynamic team at Fundraisr as a Junior Full-Stack Software Engineer in Lisbon! This pivotal role aims to enhance our modular, service-oriented architecture while scaling a platform that has impressively achieved $1M ARR.Your mission will be to transition our platform to a high-performance, enterprise-grade ecosystem that streamlines the fundraising lifecycle through the power of automation and AI.Key Responsibilities:Develop and refine our React 18 Single-Page Application using TypeScript and Vite to ensure efficient production builds.Oversee backend logic with Node.js Vercel Serverless Functions and design the database API layer utilizing Supabase and PostgreSQL.Integrate features leveraging OpenAI and Anthropic APIs for campaign classification and personalized outreach generation.Facilitate bi-directional synchronization with SmartLeads, and create OAuth infrastructures for Google and Microsoft integrations.Implement Row-Level Security (RLS) for multi-tenant isolation and prepare our infrastructure for GDPR compliance and SOC 2 certification.

Join our dynamic tech team at Sixt SE as a Backend Java Software Engineer! In this exciting role, you will be responsible for designing, developing, and maintaining robust backend systems that drive our innovative applications. Collaborate with cross-functional teams to deliver high-quality software solutions that enhance our customer experience.

Veeva Systems is a purpose-driven leader in the industry cloud sector, dedicated to accelerating the delivery of therapies to patients. As one of the fastest-growing SaaS companies ever, we achieved over $3 billion in revenue last year and are poised for even greater growth. Our core values, which include Doing the Right Thing, Customer Success, Employee Success, and Speed, define our culture. In 2021, we made a significant milestone by becoming a Public Benefit Corporation (PBC), ensuring we balance the interests of all stakeholders: customers, employees, society, and investors. As a Work Anywhere organization, we embrace flexible work arrangements, allowing you to work from home or in the office, creating an environment where you can excel. Join us as we revolutionize the life sciences sector, with a commitment to positively impacting our customers, employees, and communities.The Role Are you enthusiastic about creating impactful products in a pioneering environment? We are on a mission to develop a data stewardship platform that enhances OpenData's data curation workflows, enabling Product Managers and over 1,000 data stewards globally to collaborate efficiently and achieve their data quality and coverage objectives. As a Full Stack Product Developer, you will work closely with a talented team of engineers to design and implement features from ideation to deployment. You will thrive in an agile environment, making a direct impact on users within a rapidly expanding, market-leading life sciences company.

About the Role iCapital Network is on the lookout for a talented Full Stack Engineer to become a vital member of our iCapital Identity Platform team. In this pivotal role, you will play a crucial part in defining and delivering innovative features across our software platforms. Collaborating closely with Product Management and Design, you will engage throughout the software development lifecycle—scoping requirements, reviewing progress, and addressing any issues that arise during both automated and manual testing. The iCapital Identity platform utilizes a modern tech stack, with the frontend built in TypeScript, React, GraphQL, and Relay. The backend is powered by Elixir/Phoenix, alongside components developed in Go and Node.js, with PostgreSQL serving as the database. Our infrastructure is hosted on AWS and managed using Terraform.

Renesas Electronics Corporation seeks a Senior QA Engineer in Lisbon to drive software quality through full-stack automation. This position centers on building and executing thorough test plans and shaping automation approaches across the technology stack. Role overview This role focuses on designing comprehensive tests and developing automation strategies for software projects. The Senior QA Engineer will work to identify areas for improvement and implement solutions that enhance reliability and performance. Key responsibilities Create and execute test plans that cover both front-end and back-end systems Develop and refine automation strategies to streamline testing processes Collaborate with development teams to address quality issues and ensure robust releases Location This position is based in Lisbon.

At Arkadium, we believe in the joy of creating fun experiences, and for the past 20 years, we have done just that. As the creators of some of the world’s most-played games, including the iconic Solitaire that has graced countless Windows machines, our games are available on Arkadium.com, iOS, Android, and numerous prominent platforms worldwide.As a proud Evergreen business, our core values of Fierce Drive, Positive Energy, and Living Full Lives guide our operations and decisions.We are a privately held company (ensuring stability and a balanced approach to growth), founder-led (demonstrating passion for our craft), and we consistently earn accolades as a “Best Place to Work” – we are not your average gaming company.Recognized by 'Happiness Works' in 2023, 2024, and 2025 in Portugal, alongside 'Crain's Best Places to Work 2022' and 'Great Place to Work 2022 and 2023' in New York, we take pride in our culture!If you're excited about becoming an Arkadian, we would love to hear from you!OverviewArkadium is on the lookout for an outstanding and seasoned Senior Full-Stack Engineer to join our Core Tech team.Our Core Tech team operates with a backend-first philosophy, developing and refining shared services that power essential functionalities in Arkadium’s games and platforms. This includes authentication, chat, tournaments, friend systems, inventory management, microtransactions, and multiplayer infrastructure (Nakama) among other platform-wide capabilities.What You’ll DoLead the technical direction and delivery of complex, scalable full-stack systems utilized by live games.Design and make architectural decisions for backend and frontend systems, striking a balance between performance, scalability, and long-term maintainability.Develop and enhance backend services and APIs that support real-time, live-operated games.Seamlessly integrate backend systems with web-based frontends and browser games.Empower internal game teams by creating shared services, frameworks, and developer tools.Design, implement, and maintain reliable data models focusing on accuracy, security, and high performance.Identify performance bottlenecks throughout the stack and proactively initiate optimizations.Establish and uphold security standards for authentication, authorization, and data protection.Set engineering quality benchmarks through code reviews, architectural guidance, and mentoring.Create clear technical documentation and decision records to facilitate long-term ownership and knowledge transfer.Stay updated with modern backend, frontend, and infrastructure practices while continuously raising the technical standards of the team.Collaborate closely in an agile environment, contributing to planning, execution, and ongoing improvements.

Renesa Electronics is seeking a Senior QA Engineer in Lisbon to help uphold quality across both backend and full-stack systems. The role centers on supporting a broad technology stack and ensuring reliable, well-tested products. Key responsibilities Collaborate with cross-functional teams to shape and execute effective test strategies. Create and maintain automated test scripts for backend and full-stack components. Carry out comprehensive testing to support and enhance the product suite. Who will succeed This position fits someone who enjoys tackling complex problems and working with colleagues from different backgrounds. Adaptability and a willingness to take on new challenges are important as the team continues to grow.

OverviewJoin an innovative venture studio with a presence in Lisbon and New York, dedicated to harnessing exceptional European talent to create impactful companies. We are on the lookout for a Full-Stack Developer (Backend Focus) who will spearhead the development of an AI-driven content creation tool tailored for real estate professionals.If you're eager to contribute to a dynamic, agile team where you can take full ownership of the codebase and develop a product with evident market demand, this role is perfect for you.As the first dedicated developer, you will be instrumental in propelling our client’s AI venture into its next growth phase, managing the backend, databases, and crafting a user-friendly interface for real estate agents.You will transition from the initial core developer and play a pivotal role in shaping the product from inception to completion, with support from our venture studio’s team and resources.ResponsibilitiesCore Product DevelopmentTake full ownership of the product’s codebase, encompassing backend, database, and front-end interface.Rapidly deploy new features while ensuring scalability and maintainability in architecture.Backend & IntegrationsDevelop using PHP (8.3), Symfony (6.4), and MySQL.Guarantee seamless API integrations and dependable data flows.Interface Design & User ExperienceDesign and enhance the interface utilized by real estate agents.Convert customer feedback into clear, actionable features.Technical LeadershipAssume responsibilities from the previous core developer.Make pivotal decisions regarding architecture, tooling, and DevOps.Cross-Functional CollaborationCollaborate closely with the venture team and leadership.Adopt a product-oriented mindset, balancing speed, stability, and user experience.Requirements3–5 years of professional development experience (mid-level).Robust expertise in backend engineering while being proficient across the full stack.Enthusiasm for building within a small, entrepreneurial team.Interest in creating clean, usable interfaces (design experience is a plus).Curiosity, humility, and a desire to evolve into a technical leadership role.Fluent in English communication.Based in Lisbon, Portugal (hybrid: 4 days on-site).Preferred SkillsExperience with cloud/DevOps (AWS, Docker, CI/CD).Familiarity with AI/LLM integrations.Background in startups or venture-backed environments.BenefitsEquity stake in the venture along with a competitive salary.Tax support (accountant fees, tax returns).

We are seeking a talented Senior Full-stack Developer proficient in React.js and Node.js to join our dynamic team at Cross Border Talents in Lisbon. The ideal candidate will have a robust understanding of both front-end and back-end technologies.Key Responsibilities:Collaborate with project teams to determine technology stacks based on client needs.Contribute to the development of high-quality web applications.Mentor junior developers and assist in code reviews.Essential Qualifications:Fluency in English and reside within a reasonable commuting distance of our office.A minimum of 3 years' experience in software development with a focus on modern programming languages.Strong knowledge of both front-end and back-end technologies, including React.js, Node.js, and other frameworks.Proficiency in DevOps tools such as Kubernetes, Docker, AWS, and GCP.Desirable Attributes:Passion for technology and involvement in hobby projects.Prior experience in consulting is a plus.A keen understanding of Agile methodologies and team collaboration.

Join our dynamic team at Inetum2 as a Full Stack Developer! We are seeking a passionate and skilled developer who thrives in a collaborative environment. In this role, you will work on exciting projects that challenge your creativity and technical expertise, allowing you to contribute to innovative solutions.As a Full Stack Developer, you will be responsible for designing, developing, and maintaining both front-end and back-end applications. Your ability to work across the entire stack will be crucial in delivering high-quality digital experiences.