Job Summary: We are looking for a Full-Stack Developer to build and enhance a data reconciliation platform, with emphasis on performance, scalability, and user experience. Key Highlights: 1. Develop a full-stack data reconciliation platform 2. Focus on performance, scalability, and UX 3. Work with Python, React, AWS, PostgreSQL, and data processing We are seeking a Full-Stack Developer to build and evolve a data reconciliation platform. The work will focus on improving performance, scalability, and user experience for features such as reconciliation, filtering, pagination, export, and AWS integrations. Requirements: Architecture and tech stack Backend in Python (FastAPI) with ETL pipeline and data reconciliation. Processing large volumes of data using Polars/pandas/DuckDB. Persistence and metadata in PostgreSQL (jobs, manifests, history, parameters). File and result storage in AWS S3\. Frontend in React \+ TypeScript with data grids, filters, and server-side pagination. Technical responsibilities Enhance the ETL pipeline with focus on performance (filtering, joins, deduplication, aggregation). Optimize reading/writing of large files (CSV, Parquet, gzip). Design and operate PostgreSQL persistence (schema, indexes, queries). Implement caching, server-side pagination, and sorting for large datasets. Ensure stability and scalability of processing. Technical differentiators Experience with ETL tuning and large-scale data manipulation. PostgreSQL modeling and optimization (indexes, EXPLAIN, vacuum/analyze). Familiarity with job-oriented and queue-based architectural patterns. Benefits Meal Voucher and/or Food Voucher (Ifood Beneficios) Health Insurance (Amil) Life Insurance Optional Benefits: * Dental Insurance (Amil) * Fuel Voucher Partnerships and Other Benefits: * Gympass/Wellhub: Access to gyms offering various training modalities. * PET Health Insurance Plan * Daycare Assistance * Lincard: Partnership club offering discounts of up to 60% at over 4,000 establishments across Brazil.