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Sr./Staff Backend Engineer - Java/Kafka

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Oscilar

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Location:
Poland

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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Job Description:

Shape the future of trust in the age of AI. At Oscilar, we're building the most advanced AI Risk Decisioning™ Platform. Banks, fintechs, and digitally native organizations rely on us to manage their fraud, credit, and compliance risk with the power of AI. If you're passionate about solving complex problems and making the internet safer for everyone, this is your place.

Job Responsibility:

  • Design, develop, and maintain scalable backend services using Java and AWS technologies
  • Lead the architecture, deployment, and optimization of Apache Kafka to support real-time data streaming across distributed systems
  • Build and manage Kafka topics, brokers, producers, and consumers, ensuring optimal performance and data consistency
  • Implement streaming solutions with Kafka Streams and Kafka Connect, focusing on high availability and low-latency processing
  • Collaborate with product, frontend, and data engineering teams to define technical requirements and deliver reliable, performant services
  • Design and maintain high-performance data storage solutions using Postgres, Redis, ClickHouse, and DynamoDB
  • Optimize database performance through schema design, indexing strategies, and resource partitioning
  • Implement best practices for infrastructure security, performance monitoring, and data integrity
  • Establish and maintain CI/CD pipelines for automated testing, deployment, and monitoring
  • Provide mentorship to junior engineers, conduct code reviews, and promote best practices in software development
  • Proactively identify and resolve performance bottlenecks and technical challenges in both streaming and database systems

Requirements:

  • 8+ years of experience with Java in large-scale, distributed environments
  • Extensive experience with Apache Kafka, including Kafka Streams, Kafka Connect, partitioning, replication, and consumer group management
  • Strong experience with AWS services (e.g., MSK, EC2, RDS, DynamoDB, S3, Lambda)
  • Solid understanding of distributed system design, messaging patterns, and eventual consistency
  • Proven ability to diagnose and resolve bottlenecks in streaming and database systems

Nice to have:

  • Experience integrating Kafka with analytics solutions like ClickHouse
  • Knowledge of event-driven architecture and streaming patterns like CQRS and event sourcing
  • Hands-on experience with monitoring tools (e.g., Prometheus, Grafana, Kafka Manager)
  • Experience automating infrastructure with tools like Terraform or CloudFormation
  • Proficiency with Postgres, Redis, ClickHouse, and DynamoDB. Experience with data modeling, query optimization, and high-transaction databases
  • Familiarity with encryption, role-based access control, and secure API development

Additional Information:

Job Posted:
February 18, 2026

Employment Type:
Fulltime
Work Type:
Remote work
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