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Tech Freedom Circle
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Tech Freedom Circle

Crazy Maker Circle (Tech Freedom Architecture Circle): a community of tech enthusiasts, experts, and high‑performance fans. Many top‑level masters, architects, and hobbyists have achieved tech freedom; another wave of go‑getters are hustling hard toward tech freedom.

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Recent Articles

Latest from Tech Freedom Circle

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Tech Freedom Circle
Tech Freedom Circle
Aug 14, 2025 · Backend Development

10 Proven Techniques to Optimize API Latency from 11 s to 170 ms – A Meituan Interview Case

The article presents a step‑by‑step analysis of how to shrink a 11‑second API response to 170 ms by applying batch database writes, Redis pipeline, asynchronous processing, thread‑pool design, local‑memory buffering, MQ integration, and other performance‑tuning patterns, backed by real‑world benchmarks and code samples.

@AsyncAPI optimizationJava
0 likes · 48 min read
10 Proven Techniques to Optimize API Latency from 11 s to 170 ms – A Meituan Interview Case
Tech Freedom Circle
Tech Freedom Circle
Aug 5, 2025 · Backend Development

How to Diagnose and Fix Sudden Redis Slowdowns: A Complete Five‑Step Guide

This article provides a systematic, step‑by‑step methodology for identifying the root causes of Redis performance degradation—including big keys, slow queries, expiration spikes, memory limits, fork latency, AOF flushing, memory fragmentation, swap usage, huge pages, and CPU binding—and offers immediate mitigation tactics as well as long‑term architectural solutions to restore and maintain high throughput.

BackendCacheRedis
0 likes · 50 min read
How to Diagnose and Fix Sudden Redis Slowdowns: A Complete Five‑Step Guide
Tech Freedom Circle
Tech Freedom Circle
Aug 4, 2025 · Operations

How Do Projects Achieve High Availability Without Multi‑Site Active‑Active? – A Meituan Interview Question

The article analyzes high‑availability concepts, from single‑machine risks to multi‑site active‑active architectures, compares cold and hot backup strategies, discusses network latency challenges, and presents Ele.me’s cell‑based, sharding‑driven multi‑region solution with concrete examples, tables, and code snippets.

Data ReplicationHigh Availabilitycell-based architecture
0 likes · 28 min read
How Do Projects Achieve High Availability Without Multi‑Site Active‑Active? – A Meituan Interview Question
Tech Freedom Circle
Tech Freedom Circle
Jul 27, 2025 · Interview Experience

Designing a Payment Middle Platform from Scratch – Core Challenges (Interview Answer)

This article provides a comprehensive guide to designing a payment middle platform from zero, covering its definition, classic middle‑platform types, core architecture, functional modules, fault‑tolerance, security measures, distributed‑transaction strategies, and detailed Java pseudocode, offering interview‑ready insights for architects.

ArchitectureFault ToleranceMiddle Platform
0 likes · 39 min read
Designing a Payment Middle Platform from Scratch – Core Challenges (Interview Answer)
Tech Freedom Circle
Tech Freedom Circle
Jul 17, 2025 · Databases

What Happens Under the Hood When a Redis Command Executes? – A Deep Dive into Redis’s Reactor Model

This article explains the three‑stage execution flow of a Redis command—connection establishment, command processing, and result return—detailing how the single‑threaded reactor pattern drives event handling, how commands are parsed and dispatched, and how the output is sent back, with code snippets and a comparison to Netty’s multithreaded reactor.

Command ExecutionDatabase InternalsI/O multiplexing
0 likes · 50 min read
What Happens Under the Hood When a Redis Command Executes? – A Deep Dive into Redis’s Reactor Model
Tech Freedom Circle
Tech Freedom Circle
Jul 17, 2025 · Artificial Intelligence

DeepSeek V3 Architecture Deep Dive: MoE, MLA, DualPipe, FP8 Mixed Precision & Multi‑Token Prediction

This article provides a detailed technical analysis of DeepSeek‑V3, covering its MOE architecture, the novel Multi‑head Latent Attention (MLA) mechanism, the DualPipe pipeline‑parallel algorithm, mixed‑precision FP8 training, and the Multi‑Token Prediction (MTP) inference improvements that together boost performance and efficiency.

DeepSeekDistributed TrainingDualPipe
0 likes · 44 min read
DeepSeek V3 Architecture Deep Dive: MoE, MLA, DualPipe, FP8 Mixed Precision & Multi‑Token Prediction
Tech Freedom Circle
Tech Freedom Circle
Jul 16, 2025 · Interview Experience

How to Use and Optimize State Machines in Java for Interview Success

This article explains the concept of state machines, why traditional if‑else logic is problematic, compares popular Java state‑machine frameworks, provides performance benchmarks, walks through a complete Spring Statemachine implementation for order processing, and offers practical optimization and monitoring tips for high‑throughput scenarios.

JavaOptimizationSpring
0 likes · 30 min read
How to Use and Optimize State Machines in Java for Interview Success
Tech Freedom Circle
Tech Freedom Circle
Jul 15, 2025 · Databases

One‑Order Four‑Split: Solving MySQL Deadlocks in Million‑Row Imports

During massive daily imports of up to one million reconciliation records, MySQL deadlocks can cripple performance; this article dissects the four classic deadlock conditions, then presents a systematic “One‑Order Four‑Split” strategy—ordered writes, transaction splitting, index management, partitioning, and gap‑lock removal—backed by benchmarks, code samples, and configuration tweaks that cut lock rates by up to 90% and reduce batch times to under ten minutes.

Batch InsertDeadlockJava
0 likes · 27 min read
One‑Order Four‑Split: Solving MySQL Deadlocks in Million‑Row Imports
Tech Freedom Circle
Tech Freedom Circle
Jul 14, 2025 · Databases

How to Estimate Sharding Capacity: Calculating Required Databases and Tables for an Alibaba Interview

The article walks through why sharding is needed, outlines IO and CPU bottlenecks, presents two design principles, shows how to estimate capacity from existing data and growth trends, compares range, modulo, consistent‑hash and Snowflake sharding schemes, and details migration strategies for expanding nodes without downtime.

Data Migrationcapacity planningconsistent hashing
0 likes · 22 min read
How to Estimate Sharding Capacity: Calculating Required Databases and Tables for an Alibaba Interview