Backend Engineer

About the project
We’re working with a US-based FinTech company (New York) that builds large-scale systems for monitoring financial and crypto markets — detecting manipulation, fraud, and compliance risks. The product handles huge volumes of market data, high-load systems, and complex business/algorithmic logic. Long-term, stable cooperation — the client has partnered with us for years, and 20+ of our specialists already work within their teams.

Requirements

• Strong Java, 5+ years, recent hands-on
• Experience with large-scale / high-load data processing (millions+ records — batch or streaming)
• Kafka or similar streaming systems
• Solid multithreading / concurrency
• Good understanding of data structures & algorithms, comfortable writing performance- and memory-critical logic over large in-memory datasets
• English B2+

Nice to have

• ClickHouse, Snowflake, or similar analytical/big-data stores
• Redis, Elasticsearch
• Cloud (AWS / GCP / Azure)
• Experience with AI-assisted development tools (Copilot, Cursor, Claude, etc.)

Responsibilities

• Build and maintain data pipelines (batch/streaming) processing high-volume market data
• Design algorithm-heavy, performance-critical components
• Ensure data quality: validation, deduplication, consistency
• Design system architecture and choose the right tools and data structures
• Optimize performance and reliability under load

Cooperation: Full-time, long-term B2B contract with European working hours, including company-provided equipment.

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