Senior Java Engineer
A
Alex Staff AgencyAdTech
Montenegro. Slovenia. Slovakia. Moldova. Romania. PolandFull-TimeSenior
SalaryUp to 5,000 USD per month
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Job Details
- Languages
- English (B2 level or higher)
- Experience
- 5+ years
- Required Skills
- JavaSpring BootTypeScriptApache KafkaClickhouseGoReactLangChain
Requirements
- 5+ years of commercial software development experience with Java as the primary language.
- Deep knowledge of the Spring ecosystem (Boot, Data, MVC, Security, Cloud).
- Strong practical experience with reactive/asynchronous programming (Spring WebFlux / Project Reactor).
- Solid understanding of distributed systems, concurrency, and performance tuning at the JVM level.
- Strong verbal English skills at B2 level or higher.
- 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 deep interest in LLMs and AI orchestration tools such as LangChain, LangGraph, or N8N.
- Familiarity with frontend development using ReactJS and TypeScript.
Responsibilities
- Design, scale, and maintain real-time advertising bidding systems (DSPs, RTB Exchanges, and SSP platforms).
- Optimize backend services using Java (Spring Boot / WebFlux) and Go (Golang) to meet strict low-latency SLA/SLO targets.
- Build and manage data-intensive architectures utilizing high-load storage solutions (Aerospike, ClickHouse) and event-driven messaging (Apache Kafka).
- Participate in R&D initiatives involving GenAI, integrating Agentic AI frameworks (LangChain, LangGraph, N8N) for workflow automation and predictive analytics.
- Take full ownership of features end-to-end, contributing to the frontend layer (React / TypeScript) for internal tools and dashboards when required.
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