Senior Backend Engineer

About Klar We'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 and Berlin. Klar Empresarial, a brand-new B2B solution 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 people If 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 Role This is a full-time remote opportunity for candidates based in Germany. As part of the investment team, you will manage multiple microservices and supporting library projects in our event-driven microservices architecture powered by Kafka. You will be responsible for the full lifecycle of savings accounts, campaigns (rewards), and the entire investment platform, taxation, etc. You will work on financial-grade, high-throughput systems that must be correct and auditable, while integrating with a broader ecosystem of microservices managed by other teams. Our tech stack Java (21+)/Kotlin, SpringBoot 4, Hibernate, Flyway, ProtobufPostgres, Kafka, AWS S3, Github Actions, Prometheus, GrafanaJUnit 5, AssertJ, Mockito/MockK, Testcontainers, KarateCheckstyle/ktlint What you can expect: A small and efficient cross-functional team dedicated to high engineering standards. As our project portfolio expands, we offer an engaging work atmosphere packed with continuous learning opportunities.AI-first development with human oversight and pair development and review.A continuous delivery environment with its principles and standards. What we are looking for: Must-have: 10+ years of professional backend software development experience. Strong proficiency in: Java/Spring Boot ecosystem, HibernateMicroservices, event-driven architectures, REST APIsRelational databases (PostgreSQL preferred), transactions and concurrency, maintaining large, high-traffic tables.Continuous delivery with test-driven development (ATDD), or willingness to learn and adapt. Nice-to-have: Experience in financial systemsExperience with observability stacks Our offer to you: Competitive salary based on performance and experienceChance of earning Klar stock options26 days of paid vacation per yearMacBook ProWellhub subscription to support mental and physical healthSponsored coaching and therapy sessions via a Mental Health platform Training budget to upskill your learningHealth insurance & Pension schemeBVG Corporate ticketBerlin office if you prefer to work onsiteInternational work environment with amazing and highly skilled peopleA world-class team that helps you evolve in areas you're interested in 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!