Arihant Pal developed two core features across the 0PrashantYadav0/stdlib and gofr-dev/gofr repositories, focusing on scalable data analysis and backend infrastructure. In stdlib, Arihant enhanced the stdevwd function to support accessor arrays, refactoring its logic and updating documentation and benchmarks for improved clarity and maintainability. For gofr, Arihant introduced an Elasticsearch migrations system that enables version-controlled management of index schemas, mappings, and data, supporting structured migrations for creating and updating indices. The work leveraged Go, JavaScript, and Elasticsearch, demonstrating depth in backend development, array manipulation, and database migrations, with careful attention to documentation and performance benchmarking.