Fetching Dissection…
Behind The App is a deep-dive engineering publication and subsidiary of Akruno, founded by Mujahid Al Mahi. Instead of explaining what an application does on the surface, we dissect how engineers actually architect, scale, secure, and operate it under the hood.
Great software is never an accident. Behind every application millions of people rely on daily — the message that delivers to a billion devices in milliseconds, the video model that synthesizes coherent spacetime patches, the short link that resolves instantaneously at global scale — lies a mountain of hard-won systems engineering decisions.
Behind The App exists to make that invisible engineering visible. Most technology writing stops at product announcements or surface-level tutorials. We go beneath the interface to examine the storage engines, network protocols, caching topologies, consensus models, cryptographic handshakes, and cost optimizations that keep production systems alive under pressure.
Our goal is to change how engineers and curious builders look at familiar digital products — bridging the gap between academic systems theory and battle-tested production reality, with explanations rigorous enough for senior architects yet clear enough for any developer hungry to understand how things truly work.
Rather than skimming surface features, our dissections follow a real user action across the entire stack — from client and DNS resolution through CDNs, load balancers, API gateways, worker queues, caches, and database internals.
We examine how an architecture behaves at 1 user, where it bends at 10,000 concurrent users, and what must be re-engineered at 10 million+ — highlighting the exact bottlenecks that force architectural migrations.
We do not publish superficial summaries. Every article is synthesized from official engineering post-mortems, systems conference papers, open-source repositories, RFCs, and architectural whitepapers.
No architecture is free. For every design choice we cover, we document what the engineering team gained, what they sacrificed, and how infrastructure costs factored into the decision.
“Understanding the trade-offs is the difference between an engineer who copies and an engineer who creates.”
— Editorial Principle, Behind The App
“Don't treat abstractions as magic; understand the machine beneath.”
True engineering clarity comes from knowing what happens beneath high-level frameworks — from memory layouts, TCP sockets, and disk I/O to query planners and cache invalidation.
“You only understand a system once you know exactly how it fails.”
Every architecture looks clean on a whiteboard. We examine the failure boundaries — network partitions, thundering herds, lock contention, and cascading outages — where real engineering happens.
“Defend the runtime, not just the front door.”
Security is an architectural invariant, not a perimeter checklist. We analyze how modern platforms verify trust across untrusted networks, storage layers, and client devices.
“Low-level precision, real-world execution.”
Distributed storage engines and fault-tolerant clusters exist to serve human experiences. We connect deep backend mechanics directly to product speed, reliability, and business viability.
Independent Software Engineering & Product Venture
Behind The App is a subsidiary and flagship technical publication of Akruno, an independent software studio and technology organization founded by Mujahid Al Mahi.
Akruno leads the vision, architecture, and development of focused, production-grade software systems and technical platforms — ranging from enterprise healthcare workflows and native systems utilities to developer publications.
Founder at Akruno · Full-Stack & Systems Software Engineer
Mujahid Al Mahi is the Founder of Akruno and the creator and Editor-in-Chief of Behind The App. He is a Software Systems Engineer and Creative Technologist pursuing his B.Sc. in Computer Science & Engineering at Khulna University (and an alumnus of Notre Dame College, Dhaka).
Driven by a deep curiosity for how software operates beneath the surface, his work spans distributed systems, data-intensive system design, PostgreSQL & database internals, low-level C/C++ and Win32 systems programming, software security, and modern React/Next.js & NestJS SaaS architectures.
Monoliths vs. microservices, event-driven topologies, CQRS, and how engineering teams structure backends for long-term evolution.
Explore Architecture →Real-world algorithmic engines: matching queues, consistent hashing, ranking pipelines, consensus protocols, and storage trees.
Explore Algorithms →Bare-metal vs. cloud orchestration, global edge networks, custom protocols, DNS routing, CDNs, and high-availability data centers.
Explore Infrastructure →How systems evolve from 1 user to 10,000 to 100 million+ — database sharding, read replicas, caching layers, and backpressure.
Explore Scaling →FinOps and unit-economics engineering: how high-volume platforms process millions of workloads while keeping cloud spend lean.
Explore Cost Reduction →End-to-end cryptographic protocols, zero-trust runtimes, key ratcheting, authentication flows, and real-world threat modeling.
Explore Security →Production AI engineering: vector indexing, RAG pipelines, speculative decoding,diffusion transformers, and low-latency inference.
Explore AI & ML →Frontend architecture, state machines, rendering pipelines, and multi-platform component foundations built for scale.
Explore Design Systems →Dive into our complete archive of technical dissections or reach out to suggest an application architecture for us to investigate next.