Senior Java Engineer – EU

Ambush

. Design, build and maintain backend services with Java and Spring Boot .

Posted 11/8/2026full-timeRemote • Spain, PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in backend development using Java and Spring Boot, with a strong focus on building REST APIs and microservices. Proficient in performance optimization and production support, with a solid understanding of relational databases and event-driven architectures.

Highest-signal resume keywords

Java 11+Spring BootMicroservices ArchitectureREST API DesignKafka

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentCore JavaOOPDesign PatternsMultithreadingSQLUnit TestingIntegration TestingEvent StreamingProduction Support

Soft Skills

CollaborationCommunication

Tools & Technologies

GitCI/CDDockerJUnitMockito

Industry Keywords

BankingPaymentsFinancial ServicesAWSKubernetes

Tech Stack

Tools & technologies

AngularAWSCloudDockerHibernateJavaJenkinsJUnitKafkaKubernetesMicroservicesMockitoOraclePostgresReactSpringSpring BootSpringBootSQL

About the role

Key responsibilities & impact

Design, build and maintain backend services with Java and Spring Boot
Develop REST APIs and event-driven integrations with Kafka
Write clean, tested code and participate in code reviews
Work with architects and product owners to break down requirements and estimate work
Support production issues and improve performance and reliability
Build and modernize backend platforms with Java, Spring Boot and microservices
Deliver production features end to end in a Java microservices environment

Requirements

What you’ll need

6+ years of professional backend development with Java
Java 11+; strong in Java 8+ features such as streams and lambdas
Solid Core Java: OOP, design patterns, collections, multithreading and concurrency
Production experience with Spring Boot and microservices architecture
REST API design and integration
Relational databases and SQL (PostgreSQL, Oracle or similar)
Event streaming or messaging with Kafka or similar
Git, CI/CD pipelines (e.g. Jenkins) and Docker
Unit and integration testing (JUnit, Mockito)
Fluent English for daily work with the client
Based in Spain or Poland with the right to work there
Nice to have: experience in banking, payments or other financial services
Nice to have: AWS or another major cloud provider
Nice to have: Kubernetes
Nice to have: Hibernate / JPA
Nice to have: frontend exposure with React or Angular
Nice to have: experience on consulting or client-facing projects

Benefits

Comp & perks

People-first company culture
Supportive, trusted and empowered work environment
Distributed team / remote work
Meaningful products and lasting partnerships
Opportunities to collaborate with architects and product owners
Client-facing work in English