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Senior Java Engineer

3 months, 3 weeks ago
Slovakia, Slovenia, Moldova, Montenegro, Poland, Romania
Contract
Senior
Backend Engineer
Software Development
ClickHouse Generative AI Go Java Kafka LLM React Spring Boot TypeScript
Apply Now
Alex Staff Agency

Alex Staff Agency

Alex Staff Agency is a prominent player in the international IT recruitment market, providing staffing and recruiting services for large technical companies worldwide. With a team of highly experienced professional recruiters from various countries and...

Professional Services
11-50
Founded 2018
View All Jobs 8

Description

  • Design, scale, and maintain real-time advertising bidding systems, including DSPs, RTB exchanges, and SSP platforms.
  • Optimize backend services in Java and Go to meet strict low-latency SLA and SLO targets.
  • Build and manage data-intensive architectures using Aerospike, ClickHouse, and Apache Kafka.
  • Work on asynchronous data streaming and other high-performance infrastructure components.
  • Participate in R&D initiatives involving GenAI and workflow automation.
  • Integrate Agentic AI frameworks such as LangChain, LangGraph, and N8N for predictive analytics and automation.
  • Take full ownership of features end to end, from backend implementation to delivery.
  • Contribute to the frontend layer for internal tools and dashboards when needed using React and TypeScript.

Requirements

  • 5+ years of commercial software development experience with Java as the primary language.
  • Deep knowledge of the Spring ecosystem, including Spring Boot, Spring Data, Spring MVC, Spring Security, and Spring Cloud.
  • Strong practical experience with reactive and asynchronous programming using Spring WebFlux and Project Reactor.
  • Solid understanding of distributed systems, concurrency, and JVM-level performance tuning.
  • Strong verbal English skills at B2 level or higher for architectural discussions and collaboration on voice calls.
  • Commercial programming experience or strong familiarity with Go (Golang).
  • Hands-on experience with high-load and Big Data tools including Apache Kafka, ClickHouse, and Aerospike.
  • Real-world experience or strong interest in LLMs and AI orchestration tools such as LangChain, LangGraph, or N8N.
  • Familiarity with frontend development using ReactJS and TypeScript.
  • Must be located outside the Russian Federation due to contractual and payment restrictions; candidates from Belarus need an active legal entity or IP in Georgia or Europe for international payments.

Benefits

  • Opportunity to work on production infrastructure handling 1 trillion+ daily requests.
  • Work within a team of senior engineers with direct impact on platform architecture.
  • Choice between fully remote work worldwide or a hybrid office setup in Budva, Montenegro.
  • Stable monthly payments in USD via international B2B contracts.

Interested in this position?

Apply directly on the company website

Apply Now

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