Senior Backend Engineer - Java & Scalable Search (Remote)

United States Digital Space LLC; Ozorków; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

International projects

Flexible work location

Medical healthcare

Learning reimbursement

Well-being program

Team events

Job summary

United States Digital Space LLC is seeking a seasoned backend engineer in Poland to design, develop, and maintain scalable Java services. You will help migrate PHP components to Java, optimize performance, and collaborate across Product, Data, and Engineering teams.

The role emphasizes distributed systems, high-throughput processing, and observability, with flexible in-office, hybrid, or remote work options across international projects.

Qualifications

• Solid backend development experience.
• Strong expertise in Java and JVM-based frameworks such as Micronaut or Spring Boot.
• Professional experience with PHP and willingness to work in a mixed Java/PHP environment.
• Experience with Kubernetes, AWS, MySQL, and distributed messaging systems such as Kafka.
• Strong understanding of distributed systems, scalability, reliability, and software architecture.
• Experience building scalable systems handling high volumes of requests and data.
• Experience with unit and integration testing.
• Strong problem-solving, communication, and collaboration skills.
• Experience working in Agile, cross-functional teams.

Responsibilities

• Design, develop, and maintain scalable, reliable, and high-performance backend services.
• Build and evolve the Search platform handling millions of search requests per day across 40+ countries.
• Design components and integrations with a strong focus on scalability, maintainability, reliability, and performance.
• Work on complex distributed systems problems, including graph-based search, caching, memory optimization, and high-throughput processing.
• Contribute to the migration of Search services from PHP to Java, improving performance, throughput, parallelism, and caching.
• Drive technical improvements and contribute to architecture and technology decisions.
• Ensure backend services are observable and design effective monitoring strategies for new components.
• Identify, prioritize, and reduce technical debt together with the team.
• Support and improve CI/CD processes and ensure high-quality, reliable releases.
• Write SOLID, maintainable, flexible, testable, and scalable code.
• Collaborate closely with Product, Frontend, Data, UX, and other Engineering teams.
• Participate in code reviews, technical discussions, mentoring, and knowledge sharing.
• Lead the adoption of better engineering practices and improve team development workflows.
• Take ownership of backend solutions from concept and design through implementation and production.

Skills

Java

Micronaut

Spring Boot

Kubernetes

AWS

MySQL

Kafka

Distributed systems

Unit testing

Agile

Communication

Education

Bachelor's degree

Tools

GitLab CI/CD

Terraform

OpenSearch

Job description

United States Digital Space LLC is seeking a seasoned backend engineer in Poland to design, develop, and maintain scalable Java services. You will help migrate PHP components to Java, optimize performance, and collaborate across Product, Data, and Engineering teams.

The role emphasizes distributed systems, high-throughput processing, and observability, with flexible in-office, hybrid, or remote work options across international projects.