Senior Backend Engineer - EU

About KLAR Let’s start with the basics! Klar is a Mexican fintech startup whose mission is to democratize and revolutionize the way in which financial services have been delivered so far in Mexico, especially since half of the population doesn’t have a bank account. We offer a rich set of products across our debit and credit offers and the future is bright for Klar! We have an exciting and ambitious roadmap to bring more features to our products so that we can better serve our users. We have served more than 2 million users since our launch in 2019! We are also proud to have been certified as a “ Great Place to Work ” in Mexico - we’ve worked hard to make that happen and will continue to make bigger strides in the future! Sound like a place you’d like to be? Our people If you join us at Klar, you’ll be welcomed into a team which is rich in many talents and we are very proud! With our head office in Mexico City, and remote tech hubs in Berlin and Argentina, we are always learning something new about another culture or language. With so many people from different backgrounds and walks of life (parents, LGBTQ+, neurodivergence), you’ll definitely find your people here! Our values Ownership - We own our successes & our failures as a team. Excellence - We do everything to the best of our ability & always seek to achieve a new level of excellence in our work. Inclusion - We believe we are stronger together and actively work to promote a safe, diverse, inclusive, and respectful culture. Customer Obsession - We understand the value Klar can bring to its customers & it’s always at the forefront of our decisions. Klarity - We communicate clearly & with authenticity. It’s in our name & it’s what we do. About the Role We’re looking for a Senior Backend Engineer to join one of our core teams at Klar, where you’ll help build the systems powering the future of digital banking. This is a full-time, remote role , ideally suited for candidates based in the EU or able to collaborate within EU time zones. You’ll be working on scalable, high-impact backend services that are central to our platform. From designing robust architectures to improving system performance, your work will directly contribute to making digital banking more efficient and accessible. What you can expect: Write correct, efficient, clean, robust, and maintainable code (Mostly in Java 21+) Write unit, integration, and end-to-end tests to prevent current errors or future regressions Participate in code review to learn from others and to teach them as well Prototype new technologies and libraries that could save time and effort Write clear and concise documentation for users of your systems Identify common problems between multiple systems and develop common solutions via libraries Create designs for new systems and features of moderate complexity Make time estimates to implement designs that can aid in future planning Work on core systems with real business impact Collaborate with a highly skilled, international team Take ownership of meaningful technical challenges Contribute to a product that’s transforming financial services Mentor junior engineers What we are looking for: You are a senior engineer with experience in architecture, design, implementation and deployment of business critical systems. AI Coding Tools: Proven proficiency in leveraging modern AI development workflows to accelerate delivery and maintain code quality. You should be a 'power user' of tools such as Claude Code, GitHub Copilot (Agent Mode) or Cursor. Modern Java: Deep expertise in Java (21+) and the Spring Boot ecosystem. You are passionate about simplifying complex problems with innovative solutions which increases efficiency and saves cost. Experience with PostgreSQL or other relational databases, Apache Kafka, Docker At least 5 years of experience with microservice architectures, synchronous REST communication over HTTP, and asynchronous communication over Apache Kafka Deep understanding of database transactions and locking mechanisms. Knowledge of algorithms and data structure for distributing loads like sharding, leadership election, and more. Preferred Qualifications: 2 years of experience with logging and metrics technologies: Prometheus, Grafana, Kibana 1 year of experience with the following infrastructure technologies: AWS, Github Actions, Kubernetes, Istio, Terraform, Terragrunt Experience with the Fintech domain or high paced startup. Our offer to you Competitive salary based on performance and experience Chance of earning Klar stock options 26 days of paid vacation per year Computer device International work environment with amazing and highly skilled people A world class team that helps you evolve your skills in areas you're interested in Wellhub subscription to offer mental and physical health Klar is a safe place for everyone! We trust our highly skilled and diverse team and we’re committed to creating a welcoming and inclusive environment for new talents to flourish. We value diversity and welcome all applications regardless of gender, nationality, ethnic and social origin, religion/belief, physical abilities, age, sexual orientation and identity. Should you require any accommodations through the recruitment process, please don’t hesitate to let us know how we can help!