Senior Fullstack Engineer (Java/Kotlin + Javascript)

Job description

Senior Fullstack Engineer (Java/Kotlin + Javascript) Who is Parser? Technology alone does not create impact- the right teams do. Founded in 2018, Parser is a boutique technology services and consulting firm helping global organisations solve complex business challenges through digital transformation, product development and AI enablement. We are a fast-growing team of 340+ engineers and consultants across Europe (UK, Spain, Portugal), the Americas (US, Argentina, Uruguay, Colombia), and the Middle East. We combine global reach with a mindset focused on agility, senior expertise, and close collaboration. We work as an extension of our clients’ teams, helping them define the right problems, shape solutions, and deliver technology-driven outcomes that create measurable business value. Our expertise spans software engineering, AI & data, product development, and customer experience, delivered by teams that combine strong technical depth with a consulting mindset. Why Join Us? If you are looking for a place where you can think beyond execution, take true ownership of outcomes, influence decisions, and continuously learn alongside top-tier specialists in a truly global environment, we’d love to meet you. How will you impact? We are seeking a motivated and detail-oriented Senior Full Stack Engineer to drive the development of scalable, user-centric solutions across our entire technology stack. This role focuses on building robust backend services alongside modern frontend experiences that power the travel ecosystem. You'll work on systems that directly impact customer experience and business outcomes, taking ownership from API design through user interface implementation. Your key responsibilities: Backend Development: Develop and maintain scalable backend services using JVM languages (Java, Kotlin) that power distributed systems Design and implement RESTful APIs and integration patterns for microservices architecture Optimize database performance (SQL, NoSQL) and design efficient data access patterns Build event-driven and asynchronous systems that handle complex workflows Frontend Development: Develop responsive, user-centric frontend applications using modern web technologies Collaborate with product and design teams to translate requirements into elegant, performant UI solutions Implement client-side logic for data visualization, state management, and real-time interactions Ensure cross-browser compatibility and accessibility standards Cross-Functional: Lead small, well-defined projects across the full stack, taking end-to-end ownership Collaborate with team members to co-develop solutions and resolve problems Apply software design principles, data structures, and design patterns to write clean, maintainable, modular code Understand system and technology integration across distributed services Help coordinate stakeholder input when developing solutions Proactively identify inefficiencies and opportunities for technical improvement Test, monitor, and debug applications effectively across layers What you'll bring to the role: 5-7 years of software development experience in team environments of at least five engineers (agile, version control, etc.) Proven expertise with JVM languages (Java/Kotlin) in production environments Strong proficiency in modern frontend technologies (HTML5, CSS3, JavaScript/TypeScript, reactive frameworks) Experience with frontend frameworks like React is a plus Experience building and maintaining distributed systems in public or hybrid cloud infrastructure Solid understanding of data storage (SQL, NoSQL), API design, and microservices integration patterns Demonstrated ability to test, monitor, and debug applications across the full stack Experience with testing and monitoring tools Ability to grasp how projects fit within team objectives and business needs Comfortable working with moderately to highly complex systems Experience with event-driven architectures Familiarity with containerization and orchestration (Docker, Kubernetes) Understanding of CI/CD pipelines and DevOps practices Bachelor's degree in Computer Science or related field (or equivalent experience) Location: Candidates based in Madrid, Spain: Hybrid model, 3 days per week in the office in Chamartin Candidates based in UK/London: Hybrid model, 2-3 days per week in the office in Angel, London You will receive: The chance to join an organization with triple-digit growth that is changing the paradigm on how software products are built. The opportunity to be part of an amazing, multicultural community of tech experts. A highly competitive compensation package. A flexible and hybrid working environment. Medical insurance. Parser is committed to fostering an inclusive workplace and providing equal employment opportunities to all applicants regardless of race, religion, gender, sexual orientation, age, disability, or any other protected characteristic under applicable law. If you require reasonable accommodations during the recruitment process, please let us know and we will work with you to support your participation. By applying to this role, you acknowledge that your personal data will be processed in accordance with Parser’s Privacy Notice for recruitment purposes. Parser may use AI-assisted tools during certain stages of the recruitment process to support operational efficiency. Our recruiting teams use AI to streamline note-taking and scheduling. All hiring decisions are made by people, with human review and oversight. Come and join our #ParserCommunity. Follow us on Linkedin