Developed and integrated a Sliding Window rate limiter into the env0/terraform-provider-env0 repository to enhance the reliability of outgoing API requests. Focused on API client development using Go, the work involved designing a new ratelimiter package and embedding it within the existing HttpClient to control request rates and prevent burst-related errors. This approach addressed the need for stable API interactions, especially under high load, by ensuring compliance with external rate limits. Emphasis was placed on robust software design and thorough testing, resulting in a foundational capability that improves the predictability and stability of API calls without introducing new bugs.