Senior Backend Engineer

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🕒 July 22

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Klar

WebsiteLinkedInAll Job Openings

51 - 200 employees

🏗️ Construction

🏭 Manufacturing

🛒 Retail

Construction • Manufacturing • Retail

Klar is a company based in Denmark that specializes in the design and sale of high-quality windows and doors. They offer a wide range of customizable products, including Dannebrog windows, Bondehus windows, and various types of doors such as terraced and facade doors. Klar provides options for both outward and inward opening windows, and they emphasize affordability by bypassing costly intermediaries. They boast up to a 12-year warranty on their products and use FSC-certified wood produced in the EU. Klar operates through a digital showroom and provides comprehensive customer service. Products are available in Denmark and neighboring countries like Norway and Sweden. Their focus on excellent service and competitive pricing is reflected in their high Trustpilot ratings from satisfied customers.

📋 Description

• Design, implement, and own backend services and APIs across the loan lifecycle, from technical design through production rollout. • Write clean, well-tested, maintainable Java code following the team's engineering standards (checkstyle, code review, high test coverage). • Build and evolve Kafka-based event producers/consumers that keep credit, accounting, and risk systems in sync. • Author safe, backward-compatible database migrations for a system with large, continuously-written tables. • Collaborate closely with Risk, Data Science, Product, and Accounting stakeholders to translate business and regulatory requirements into system behavior. • Participate in code reviews, design discussions, and incident response; mentor other engineers on the team. • Write and maintain unit, integration, and contract tests to guard the correctness of financial calculations and state transitions.

🎯 Requirements

• 5+ years of professional backend software development experience • Strong proficiency in Java (Java 17/21) and the Spring Boot ecosystem (Spring Data JPA, Spring Kafka, Spring Retry) • Solid experience designing and operating REST APIs in a microservices architecture, including API documentation (OpenAPI/Swagger) • Hands-on experience with relational databases (PostgreSQL preferred) and schema migration tools (Flyway or similar), including migrations on large, high-traffic tables • Experience building event-driven systems with message brokers such as Apache Kafka (producers, consumers, retry/error handling) • Strong grasp of testing practices: JUnit 5, Mockito, AssertJ, Testcontainers, and writing tests for asynchronous/event-driven flows • Comfort working with monetary/financial calculations that demand precision and correctness (e.g., BigDecimal, rounding, fee/interest computation) • Familiarity with containerized local development (Docker, Docker Compose) and CI/CD pipelines • Strong communication skills and the ability to work with cross-functional, non-technical stakeholders (e.g., Risk and Finance teams)

🏖️ Benefits

• Competitive salary based on performance and experience • Chance of earning Klar stock options • 26 days of paid vacation per year • Computer devices • Wellhub subscription to offer mental and physical health • Sponsored coaching and therapy sessions via a Mental Health platform • Training budget to upskill your learning • Health insurance & Pension scheme • BVG Corporate ticket Berlin office if you prefer to work onsite • 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