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Senior Software Engineer - APIs

Unacast - Remote - In-office - posted 2026-09-09

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Unacast is a leading provider of global location intelligence, delivering analytics about human mobility in the physical world. The company partners with organizations across private and public sectors to unlock the potential of location data, enabling smarter decision-making based on trustworthy, reliable, and privacy-friendly intelligence. We are seeking a Senior Software Engineer to join our API team, which builds customer-facing and internal APIs for fast querying of large datasets. These APIs are the core building blocks of our data offering. In this role, you will: - Collaborate with product development and engineering teams to translate business initiatives into concrete technical requirements and innovative solutions - Design and maintain our large Snowflake data lake, including database table design and efficient SQL querying to achieve short API response times - Develop customer-facing and internal REST APIs using Java and the Spring Framework, with emphasis on performance and reliability - Create comprehensive internal and external documentation for development, maintenance, and customer onboarding - Develop unit, integration, and runtime tests to ensure quality and adherence to best practices - Generate data, metrics, and visualizations for algorithm verification and optimization - Work independently with basic guidance while collaborating effectively within the larger team Required qualifications: - 5+ years of Java 8+ development experience with Spring Framework for REST APIs - Excellent SQL skills including database design, table design, automated processes, and efficient querying; Snowflake SQL strongly preferred - Proficiency with Amazon Web Services (AWS) and its services (e.g., ECS, X-Ray) - Experience processing data efficiently in JSON and GeoJSON formats - Ability to translate business problems into technology solutions - Strong communication, documentation, and organizational skills - Proficiency with Generative AI tools for code authorship, testing, and debugging while maintaining security and privacy standards - Experience with multiple applications from requirements through production deployment

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