--- title: "Rahul K (@rahulk27) | Hashnode" description: "Crafting technology with purpose, precision, and trust. Read the latest articles by Rahul K on Hashnode." url: "https://hashnode.com/@rahulk27" --- @rahulk27 # Rahul K @rahulk27 · Bangalore, India · Joined May 2025 Crafting technology with purpose, precision, and trust. ### [Cost Awareness: Building Systems That Know What They Cost](https://engineeringtheinvisible.dev/cost-awareness-building-systems-that-know-what-they-cost?utm_source=hashnode&utm_medium=feed) Engineering with intent — where every choice counts, and cost is never an afterthought. 9 min read · [engineeringtheinvisible.dev](https://engineeringtheinvisible.dev/cost-awareness-building-systems-that-know-what-they-cost?utm_source=hashnode&utm_medium=feed) [Jul 16, 2025](https://hashnode.com/posts/cost-awareness-building-systems-that-know-what-they-cost/6877b072b0fa0498f1a5a708) ### [Using CompletableFuture for Asynchronous Processing in Spring Boot](https://engineeringtheinvisible.dev/using-completablefuture-for-asynchronous-processing-in-spring-boot?utm_source=hashnode&utm_medium=feed) Unlocking Efficient Asynchronous Processing in Spring Boot with CompletableFuture 6 min read · [engineeringtheinvisible.dev](https://engineeringtheinvisible.dev/using-completablefuture-for-asynchronous-processing-in-spring-boot?utm_source=hashnode&utm_medium=feed) [Jul 3, 2025](https://hashnode.com/posts/using-completablefuture-for-asynchronous-processing-in-spring-boot/6865e23e8aa95488d48d091a) ### [Caching Strategy: Designing for Speed without Compromising Truth](https://engineeringtheinvisible.dev/caching-strategy-designing-for-speed-without-compromising-truth?utm_source=hashnode&utm_medium=feed) Designing Fast, Reliable Systems with Smart Caching Decisions 8 min read · [engineeringtheinvisible.dev](https://engineeringtheinvisible.dev/caching-strategy-designing-for-speed-without-compromising-truth?utm_source=hashnode&utm_medium=feed) [Jun 30, 2025](https://hashnode.com/posts/caching-strategy-designing-for-speed-without-compromising-truth/6862986857e8953c1b016c60) ### [Data Retention: Designing for the Right Memory Span](https://engineeringtheinvisible.dev/data-retention-designing-for-the-right-memory-span?utm_source=hashnode&utm_medium=feed) Knowing what to forget is just as vital as knowing what to remember. 8 min read · [engineeringtheinvisible.dev](https://engineeringtheinvisible.dev/data-retention-designing-for-the-right-memory-span?utm_source=hashnode&utm_medium=feed) [Jun 28, 2025](https://hashnode.com/posts/data-retention-designing-for-the-right-memory-span/685ff569c515f138c525df0d) ### [Data Privacy: Designing with Dignity in Mind](https://engineeringtheinvisible.dev/data-privacy-designing-with-dignity-in-mind?utm_source=hashnode&utm_medium=feed) Designing with Boundaries: Building Trust through Responsible Data Practices 9 min read · [engineeringtheinvisible.dev](https://engineeringtheinvisible.dev/data-privacy-designing-with-dignity-in-mind?utm_source=hashnode&utm_medium=feed) [Jun 26, 2025](https://hashnode.com/posts/data-privacy-designing-with-dignity-in-mind/685d527e7bf904370df7c6a2)