Java Backend Developer

Description

Job Summary: We are seeking a Java Backend Developer to build robust and scalable solutions in an agile environment, directly impacting digital payment products. Key Highlights: 1. Be part of a Great Place To Work organization 2. Work in an agile environment with multidisciplinary teams 3. Develop robust and scalable solutions in digital payments DESCRIPTION **JOIN OUR TEAM AS A JAVA BACKEND DEVELOPER!** Do you want to join an organization committed to caring for people and supporting their personal and professional growth? Are you passionate about development and eager to tackle 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 — ranking **5th in 2024**, thanks to our values, culture, and internal benefits and initiatives focused on people. We support our clients in technological and agile transformation projects. **We work in discipline-based teams and multidisciplinary squads across highly diverse projects** (retail, healthcare research, banking, security, mobility, etc.). Although we have grown significantly over the past year, we remain true to our essence: **always people-centered**. We provide continuous personal follow-up with our technical and Talent teams. Moreover, we consistently prioritize 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 seek individuals with experience as **Backend Developers**, who would join our Tech discipline, led by **Carlos Cañado and Reinaldo Aguilera**. We’re looking for 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 in payment environments. * Analyze technical requirements and propose viable solutions alongside 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 development best practices. * Work in an agile (Scrum) environment, participating in daily stand-ups, backlog refinements, and retrospectives. **Requirements** * Solid 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 in Maven-based projects. * Experience in unit, integration, and E2E testing (knowledge of Mockito, JUnit, etc.). * Knowledge of agile methodologies: Agile, Scrum, Kanban, etc. **Nice-to-have** * Experience with Kotlin. * Experience working in AWS. * Knowledge of 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 skills: To understand complex payment flows, identify failures, and propose sound technical solutions, considering both technical and functional context. * 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. A mindset of continuous learning 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 you develop — from design through production and support. Over **350 Kairoseros and Kairoseras** make up our Tech family at Kairós, delivering technological solutions across all types of projects — from inception and product definition, working with all kinds of frameworks, and always ensuring solutions that are not only effective but also easy to use, maintain, and update according to today’s technological landscape. **What can we offer you?** At Kairós, you’ll find: * Free English classes in small groups. * 23 vacation days, plus December 24th and 31st off, 1 day for events, and **3 flexible conciliation days!** * Enjoy summer with our reduced working hours in August and year-round Friday half-days. * Flexible compensation via Cobee — usable for dining, public transport, training, and childcare vouchers. * Health insurance with Cigna or Sanitas — because we care about your physical and mental well-being. * Ongoing personal support through our Wellness 3\.0 program and consistent technical mentoring. * Opportunities to strengthen your personal brand at internal and external events. * Membership in a strong community and access to incredible, industry-leading colleagues. * 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 love learning, sharing knowledge, and treating others with respect and kindness. If you’re interested in contributing to an open, transparent, and trusting culture — and if you also possess organizational ability, responsibility, commitment, and a 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.