Job Summary: We are looking for an experienced Java Backend Developer to join a multidisciplinary team, building robust and scalable solutions in digital payments environments. Key Highlights: 1. Be part of a Great Place To Work organization 2. Participate in technological and agile transformation projects 3. Work in an agile environment focused on quality and learning DESCRIPTION **JOIN OUR TEAM AS A JAVA BACKEND DEVELOPER!** Do you want to be part of an organization committed to caring for people and supporting their personal and professional growth? Are you passionate about development and eager to take on new challenges? Join Kairós! **Who Are We?** We have been certified as a **Great Place To Work** company since 2019 — for the fifth consecutive year — and ranked **5th in 2024**, thanks to our values, culture, and internal benefits and initiatives centered around people. We accompany our clients in technological and agile transformation projects. **We work in discipline-based teams and in multidisciplinary squads across highly diverse projects** (retail, healthcare research, banking, security, mobility, etc.). Although we’ve grown significantly over the past year, we don’t want to lose sight of our essence: **always people-centered**. We conduct constant personal follow-ups with our technical and Talent teams. Moreover, we consistently champion transparency and clarity. We operate in **Spain, Mexico, and Peru**. At Kairós, you’ll find projects where you can work remotely without losing closeness with the rest of the team! **What Are We Looking For?** At **Kairós**, we’re seeking individuals with experience as **Backend Developers**, who will join our Tech discipline, led by **Carlos Cañado and Reinaldo Aguilera**. We seek a Backend Developer with development experience who enjoys building robust and scalable solutions, and who wants to work in an environment where technology directly impacts digital payment products: card tokenization, e-commerce authentication, and QR code scanning. **Responsibilities** * Design and develop APIs and microservices. * Implement new features and evolve existing services within payment environments. * Analyze technical requirements and propose viable solutions jointly with the team. * Collaborate with architecture, frontend, and other system teams. * Write and maintain tests (unit, integration, and end-to-end). * Participate in solution certification with brands (Visa, Mastercard, etc.). * Conduct code reviews and ensure adherence to good development practices. * Work in an agile (Scrum) environment, participating in daily standups, refinement sessions, and retrospectives. **Requirements** * Solid hands-on experience developing in Java with Spring Boot. * Experience building REST APIs and backend services, and using tools such as Insomnia or similar. * Practical knowledge of microservice development. * Experience working with Git and version control. * Experience in automated testing (unit and integration). * Experience working on Maven-based projects. * Experience writing unit, integration, and E2E tests (knowledge of Mockito, JUnit, etc.). * Knowledge of agile methodologies: Agile, Scrum, Kanban, etc. **Desirable** * Experience with Kotlin. * Experience working on AWS. * Familiarity with banking environments or internal platforms (ASO/APX). * Database language knowledge, preferably Oracle. * Experience in payment systems or brand certifications. * Knowledge of Python. * Experience using AI-based tools for software development. **Soft Skills** * Analytical and problem-solving ability: To understand complex payment flows, identify failures, and propose solid technical solutions considering both technical and functional contexts. * Effective communication: To explain technical solutions, participate in discussions with other teams (architecture, frontend, product owner, service owner, scrum master, developers, tech leads), and document accurately. * Proactivity: Not only executing tasks but also identifying improvements, anticipating problems, and proposing solutions — maintaining a continuous learning attitude in the fast-evolving tech landscape. * Quality orientation: Especially critical in payments — attention to detail, focus on testing, and preventing production errors. * Adaptability: Handling shifting priorities, evolving requirements, certifications — thriving in dynamic environments. * Responsibility and ownership: Taking full accountability for what is developed — from design through to production and support. More than **350 Kairoseros and Kairoseras** form our Tech family at Kairós, delivering technological solutions across all types of projects — from inception and product definition, working with various frameworks, and ensuring solutions that are not only effective but also easy to use, maintain, and adapt to today’s technological landscape. **What Can We Offer You?** At Kairós, you’ll find: * Free English classes in small groups. * 23 vacation days, December 24th and 31st off, 1 day for events, and **3 flexible conciliation days!** * Enjoy summer with our reduced working hours in August and intensive schedule every Friday throughout the year. * Flexible compensation via Cobee — usable for dining, public transport, training, and childcare vouchers. * Health insurance with Cigna or Sanitas — we care about your physical and mental well-being. * Continuous personal support through our Wellness 3.0 program and ongoing technical mentoring. * Opportunities to strengthen your personal brand at internal and external events. * Membership in a large community and support from exceptional individuals and industry leaders. * But above all… being part of a company that listens to you, cares for you, and strives to meet your needs and expectations. You’ll fit right in if you enjoy learning, sharing your knowledge, and treating others with respect and kindness. If you’re interested in contributing to an open, transparent, and trusting culture — and if you possess organizational skills, responsibility, commitment, and a relentless pursuit of code quality. **\#TRY \#THINK \#FEEL \#ENJOY** At Kairós, we firmly believe in the importance of equality and diversity in the workplace. We are committed to creating an inclusive and respectful environment where all employees feel valued and have the opportunity to reach their full potential — regardless of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or any other characteristic protected by law.