Senior Backend Engineer - EU

About KlarWe're turning one of the world's largest underbanked markets into something fairer, simpler, and more transparent.7 million users served since 2019. Uber's first global credit card, built right here in Mexico. Klar Empresarial, a brand-new B2B solution — Klar Empresarial — bringing agile credit and smart accounts to SMEs who've been ignored by traditional banks for too long. And a full banking license on the horizon, because our customers asked for it and we listened.We move fast, we think big, and we go all in, because as our CEO puts it: "Growing doesn't always mean going further. Sometimes it means going deeper."Behind all of it is a team of 30+ nationalities, working across Mexico City, Berlin, and Argentina, obsessed with building financial products that are simpler, faster, and fairer than anything that came before.This is Klar, and we're seeking the people who'll write the next chapter.Our peopleIf you join us at Klar, you’ll be welcomed to a team that 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 (young professionals, 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 RoleThis is a full-time remote opportunity for candidates based in EU. You’ll join a new backend team within a newly established business division at Klar, where we’re expanding capacity to support the launch of additional products and services. As a fintech, Klar operates in a fast-paced, dynamic, and low-hierarchy environment where individual contributors are encouraged to take ownership, influence technical direction, and have a meaningful impact on the business. In this role, you’ll work on core backend services and scalable platform capabilities that help reduce the cost of digital banking while supporting Klar’s continued growth in the financial services industry. You’ll collaborate closely with product and engineering leaders, contribute to architectural decisions, and help shape the evolution of a critical platform from an early stage.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 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. You are passionate about simplifying complex problems with innovative solutions which increases efficiency and saves cost. At least 5 years of experience with several of the following development technologies: Java, SpringBoot, PostgreSQL or other relational databases, Apache Kafka, DockerAt least 5 years of experience with microservice architectures, synchronous REST communication over HTTP, and asynchronous communication over Apache KafkaDeep 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, TerragruntSpanish language skills. Experience with the Fintech domain or high paced startup.Our offer to youCompetitive salary based on performance and experienceChance of earning Klar stock options26 days of paid vacation per yearComputer device International work environment with amazing and highly skilled peopleA world class team that helps you evolve your skills in areas you're interested inWellhub subscription to offer mental and physical healthKlar is a safe place for everyone!We trust our highly skilled and diverse team and we’re committed to creating a welcoming