Backend Developer – Java, Spring Boot

Stellenbeschreibung:

Write clean, maintainable, testable, and efficient Java code using Spring Boot
Build and maintain secure, reliable REST APIs and backend services
Work with PostgreSQL, Hibernate, database schemas, queries, indexes, migrations, and data models
Translate product and business requirements into reliable backend functionality
Develop and maintain microservices within a distributed backend architecture
Implement third-party integrations, internal services, and other backend integrations
Ensure validation, edge-case handling, data consistency, and correctness
Write and maintain automated tests and collaborate with QA engineers
Own assigned backend features from implementation through testing and release
Collaborate with frontend, QA, DevOps, product, design, and client-side stakeholders
Raise unclear requirements, technical risks, dependencies, and potential issues early
Join a client project expected to run through February 2027

Requirements

3+ years of professional backend development experience
Strong practical knowledge of modern Java development; Java 21 preferred
Strong hands-on experience with Spring Boot
Practical experience with Hibernate / JPA
Good understanding of PostgreSQL, relational databases, SQL, data modeling, and query performance
Experience designing, implementing, testing, and consuming RESTful APIs
Experience with automated backend testing
Comfortable working with Git, pull requests, code reviews, and collaborative development workflows
Familiarity with microservices and distributed systems
Experience with AWS or another cloud environment is a plus; ECS/Fargate particularly useful
Fluent professional English is mandatory
Spanish is a significant advantage
Ability to independently handle assigned features and communicate requirements, dependencies, and technical decisions
Experience in Fintech, SaaS, HR, Payroll, ERP, AI-enabled products, or complex Enterprise platforms is a plus
Experience using Claude Code or similar AI-assisted development tools is a bonus

Core Competencies

Demonstrates expertise in Java development, particularly with Spring Boot and Hibernate, while effectively managing backend features and collaborating across teams. Proficient in building secure REST APIs and maintaining data integrity within PostgreSQL and microservices architectures.