Senior Backend Engineer — Scalable Java/PHP, Search (Remote)

United States Digital Space LLC; Ozorków; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

International projects

Hybrid/remote flexibility

Medical healthcare

Recognition program

Learning reimbursement

Well-being program

Team events

Sports compensation

Referral bonuses

Equipment provision

Job summary

United States Digital Space LLC is seeking a backend engineer to design, build, and maintain scalable services in a Java/PHP environment. You will work on a high-visibility Search platform used across multiple countries.

You will collaborate with Product, Frontend, Data, UX, and other engineering teams, own components end-to-end, and help migrate PHP services to Java, improving performance and reliability. Experience with distributed systems and cloud tech is essential.

Qualifications

• Solid professional backend development experience.
• Strong expertise in Java and JVM frameworks (Micronaut/Spring Boot).
• Experience with PHP in a mixed Java/PHP environment.
• Experience with Kubernetes, AWS, MySQL, and 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 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 migration of Search services from PHP to Java, improving performance and caching.
• Drive technical improvements and contribute to architecture and technology decisions.
• Ensure backend services are observable and design effective monitoring strategies.
• Identify, prioritize, and reduce technical debt with the team.
• Support and improve CI/CD processes and ensure high-quality releases.
• Write SOLID, maintainable, testable, and scalable code.
• Collaborate with Product, Frontend, Data, UX, and other Engineering teams.
• Participate in code reviews, mentoring, and knowledge sharing.
• Lead adoption of better engineering practices and improve team workflows.
• Take ownership of backend solutions from concept to production.

Skills

Backend development

Java & JVM

PHP experience

Kubernetes

AWS

MySQL

Kafka

Distributed systems

Unit & integration testing

Agile / cross-functional

Tools

OpenSearch/Elasticsearch

GitLab CI/CD

Terraform

Job description

United States Digital Space LLC is seeking a backend engineer to design, build, and maintain scalable services in a Java/PHP environment. You will work on a high-visibility Search platform used across multiple countries.

You will collaborate with Product, Frontend, Data, UX, and other engineering teams, own components end-to-end, and help migrate PHP services to Java, improving performance and reliability. Experience with distributed systems and cloud tech is essential.