(Senior) Java Developer - Freelance

Senior Backend Engineer

Netguru is a trusted partner in digital commerce. The company helps leading brands modernize B2B solutions, marketplaces, and retail ecosystems. Since 2008, it has empowered businesses with cutting-edge technology, AI-powered personalization, and world-class engineering and design teams. A certified B Corporation®, Netguru is trusted by major brands including IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.

Contract: B2B – Remote (EU Only)

Rate: up to 30 EUR/hour + 20 paid vacation days

Language: English C1 Responsibilities

• Design and build scalable backend systems for processing large volumes of data
• Develop and maintain robust, high-performance APIs for data integration and access
• Build, optimize, and maintain ETL pipelines for data ingestion and transformation
• Process and manage large datasets in distributed environments
• Optimize system performance, latency, and throughput across backend services
• Improve database performance through indexing, schema design, and query optimization
• Collaborate with product managers, designers, and engineering teams to deliver scalable solutions
• Work closely with stakeholders to define and implement data-driven functionalities
• Ensure high standards of security, reliability, scalability, and maintainability
• Mentor and support other engineers as part of a senior-level engineering role
• Stay up to date with modern backend technologies, architecture patterns, and engineering best practices