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Umesh Malik

I'm Umesh Malik, a Software Engineer based in Gurugram, India. I specialise in building scalable, high-performance web applications with a focus on React, TypeScript, and modern web architecture.

Location Gurugram, Haryana, India Joined Joined on  Personal website https://umesh-malik.com/
Post-Quantum TLS Migration: Stop Paying the 150ms Retry Tax
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Post-Quantum TLS Migration: Stop Paying the 150ms Retry Tax

#tls #postquantumcryptography #webengineering #networksecurity
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9 min read
How to Stop AI Scrapers Overloading Your Server: the 20% CPU Toll
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How to Stop AI Scrapers Overloading Your Server: the 20% CPU Toll

#aisecurity #botdefense #webinfrastructure #ddosmitigation
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9 min read
Build JavaScript Proxy Reactive State: 855 Bytes, No Framework
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Build JavaScript Proxy Reactive State: 855 Bytes, No Framework

#javascript #webengineering #proxy #statemanagement
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9 min read
Migrate to a New CMS With Zero Downtime: a 28K RPS DDoS Mid-Rollout
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Migrate to a New CMS With Zero Downtime: a 28K RPS DDoS Mid-Rollout

#webengineering #cloudflareworkers #sitereliability #loadtesting
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10 min read
AI incident response skill decay: the aviation fix that works
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AI incident response skill decay: the aviation fix that works

#sre #incidentresponse #careerproductivity #aiengineering
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9 min read
Rust dyn Trait vs generics: how to switch, and the 16-byte cost
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Rust dyn Trait vs generics: how to switch, and the 16-byte cost

#rust #systemsprogramming #memorymanagement #performanceengineering
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10 min read
How to Give an AI Agent CMS Write Access Without Melting the Cache
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How to Give an AI Agent CMS Write Access Without Melting the Cache

#mcp #aiagents #webengineering #caching
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9 min read
AI Agent Egress Bypass: Fix the GET Trick Behind 18k Wiki Edits
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AI Agent Egress Bypass: Fix the GET Trick Behind 18k Wiki Edits

#aisecurity #aiagents #sandboxing #networksecurity
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10 min read
Build an AI Agent Knowledge Base: The Pattern That Cut Tokens 80%
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Build an AI Agent Knowledge Base: The Pattern That Cut Tokens 80%

#aiagents #contextengineering #aicodingagents #llmengineering
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10 min read
How to Block AI Training Without Losing Search Visibility
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How to Block AI Training Without Losing Search Visibility

#aisecurity #webcrawlers #cloudflare #robotstxt
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7 min read
How to Harden vLLM Inference: CVE-2025-9141 Defense Guide
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How to Harden vLLM Inference: CVE-2025-9141 Defense Guide

#aisecurity #llmengineering #vllm #vulnerabilitymanagement
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9 min read
Rust LSP Low Memory: How to Run Glancer Locally on 8GB RAM
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Rust LSP Low Memory: How to Run Glancer Locally on 8GB RAM

#rust #developertooling #lsp #performanceengineering
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8 min read
OpenAI Python HTTPX2 Migration: Fix the TLS Trap First
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OpenAI Python HTTPX2 Migration: Fix the TLS Trap First

#openai #python #llmengineering #api
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7 min read
MS Paint Invisible Watermark: How to Find the GUID in AI Images
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MS Paint Invisible Watermark: How to Find the GUID in AI Images

#aisecurity #privacyengineering #contentprovenance #reverseengineering
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9 min read
Fix the PCIe Bottleneck in AI Training: How Built-in NICs Work
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Fix the PCIe Bottleneck in AI Training: How Built-in NICs Work

#aiengineering #aiinfrastructure #distributedtraining #gpu
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10 min read
ChatGPT Search Optimization After the Site-Scoping Shift
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ChatGPT Search Optimization After the Site-Scoping Shift

#aisearch #geo #seo #chatgpt
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7 min read
How to Reduce Rust Struct Memory Footprint: 5 Techniques, 56% Smaller
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How to Reduce Rust Struct Memory Footprint: 5 Techniques, 56% Smaller

#rust #performanceengineering #memoryoptimization #systemsprogramming
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10 min read
Configure Optional OAuth Scopes for MCP Servers and Agents
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Configure Optional OAuth Scopes for MCP Servers and Agents

#oauth #mcp #cloudflare #apidesign
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7 min read
Vercel CLI DNS Commands: Manage Records Without the Dashboard
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Vercel CLI DNS Commands: Manage Records Without the Dashboard

#vercel #cli #dns #developertooling
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6 min read
Self-Hosted AI Coding Agent: Sandboxed Prompt-to-Deploy for $25/mo
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Self-Hosted AI Coding Agent: Sandboxed Prompt-to-Deploy for $25/mo

#aicodingagents #selfhosting #devops #sandboxing
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7 min read
Use Postgres for everything in production: 5 swaps, 1 cliff
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Use Postgres for everything in production: 5 swaps, 1 cliff

#webengineering #postgres #backendarchitecture #database
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8 min read
Traffic Anomaly or Outage? What a 30% Drop Actually Means
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Traffic Anomaly or Outage? What a 30% Drop Actually Means

#observability #cloudflare #networking #monitoring
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8 min read
Claude Code macOS printer driver: fixing the DPI bug HP missed
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Claude Code macOS printer driver: fixing the DPI bug HP missed

#aicodingagentsdx #claudecode #reverseengineering #macos
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9 min read
Gemini agent hooks fail open: how to block a tool call anyway
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Gemini agent hooks fail open: how to block a tool call anyway

#aisecurity #agentharness #gemini #mcp
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9 min read
How to verify AI-generated benchmark claims: 1.4x to 1.5x slower
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How to verify AI-generated benchmark claims: 1.4x to 1.5x slower

#aicodingagentsdx #benchmarking #evals #llmagents
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9 min read
SVG to MP4 in the browser: a two-step workflow, no server
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SVG to MP4 in the browser: a two-step workflow, no server

#webengineering #webassembly #svg #browsertools
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8 min read
Rust GPU Offload Without unsafe: The 400x Mistake That Isn't Safety
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Rust GPU Offload Without unsafe: The 400x Mistake That Isn't Safety

#rust #gpuprogramming #llvm #performanceengineering
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8 min read
Turn off AI features permanently: configure 1 policy, not 25 toggles
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Turn off AI features permanently: configure 1 policy, not 25 toggles

#aisecurity #privacy #chrome #windows
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11 min read
AI writing policy for engineers: the template and 5 checks
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AI writing policy for engineers: the template and 5 checks

#technicalwriting #engineeringculture #aipolicy #documentation
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12 min read
Remove Cloudflare beacon.min.js: you must opt in to opt out
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Remove Cloudflare beacon.min.js: you must opt in to opt out

#cloudflare #webperf #contentsecuritypolicy #privacy
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10 min read
How DNA wires a brain: 300M bits for 100 trillion connections
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How DNA wires a brain: 300M bits for 100 trillion connections

#neuroscience #informationtheory #aiengineering #algorithms
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9 min read
Zero downtime database migration: 5 flags and a 17x P90 gap
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Zero downtime database migration: 5 flags and a 17x P90 gap

#database #infrastructure #migration #observability
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11 min read
Fix EEVDF latency regressions with sched_ext: Meta's 28% p99 win
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Fix EEVDF latency regressions with sched_ext: Meta's 28% p99 win

#linux #performance #kernel #taillatency
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11 min read
Qwen3.8 27B VRAM: how to fit 262K context in 16 GiB, not 64
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Qwen3.8 27B VRAM: how to fit 262K context in 16 GiB, not 64

#llminference #vllm #qwen #kvcache
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10 min read
Configure Cloudflare Access for Workers: auth before your code runs
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Configure Cloudflare Access for Workers: auth before your code runs

#cloudflare #cloudflareworkers #zerotrust #aisecurity
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9 min read
Kubernetes on bare metal: the 4 cloud integrations you must build
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Kubernetes on bare metal: the 4 cloud integrations you must build

#kubernetes #infrastructure #baremetal #storage
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10 min read
Cut agent tool call cost: GitHub's 20% fix was a prompt rewrite
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Cut agent tool call cost: GitHub's 20% fix was a prompt rewrite

#aicodingagents #agentdesign #developertooling #promptengineering
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9 min read
Build your research spike as running code: 8 blockers a doc missed
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Build your research spike as running code: 8 blockers a doc missed

#engineeringpractice #aicodingagents #prototyping #database
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10 min read
How to Verify AI Crawler IPs: 3 Lists Are Over a Year Stale
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How to Verify AI Crawler IPs: 3 Lists Are Over a Year Stale

#aisecurity #webcrawlers #botverification #agenticweb
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10 min read
Build on-device AI without breaking E2EE: the metrics leak first
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Build on-device AI without breaking E2EE: the metrics leak first

#aisecurity #privacyengineering #ondeviceml #confidentialcomputing
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10 min read
Agent context compaction: keep what the 150K cutoff drops
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Agent context compaction: keep what the 150K cutoff drops

#aiagents #contextengineering #claudeapi #agentarchitecture
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9 min read
Fix slow LLM inference in macOS VMs: 12.6 207 tok/s
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Fix slow LLM inference in macOS VMs: 12.6 207 tok/s

#llminference #applesilicon #virtualization #llamacpp
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10 min read
How to Test an LLM's Knowledge Cutoff: Opus 5's May Claim Falls Short
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How to Test an LLM's Knowledge Cutoff: Opus 5's May Claim Falls Short

#llmengineering #modelevaluation #claudeopus5 #gpt56
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8 min read
Learn Complex Topics With Claude Code: Build a Simulation, Not Notes
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Learn Complex Topics With Claude Code: Build a Simulation, Not Notes

#claudecode #aicodingagents #learning #developerproductivity
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8 min read
Run Muse Glimmer 30B locally: 55GB shrinks to under 20GB
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Run Muse Glimmer 30B locally: 55GB shrinks to under 20GB

#localllm #quantization #aicodingagents #openweights
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8 min read
vLLM throughput tuning: configure these four flags, not a bigger GPU
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vLLM throughput tuning: configure these four flags, not a bigger GPU

#llmengineering #llminference #vllm #gpu
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10 min read
How to sandbox an AI agent: 10 of 122 eval runs went rogue
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How to sandbox an AI agent: 10 of 122 eval runs went rogue

#aisecurity #aiagents #sandboxing #supplychainsecurity
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10 min read
Run CI/CD on Cloudflare Workflows: deploy in 18 lines, 33 free runs
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Run CI/CD on Cloudflare Workflows: deploy in 18 lines, 33 free runs

#cloudflare #cicd #workflows #devrel
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10 min read
Configure Dependabot grouped updates: one PR a month, CVEs instant
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Configure Dependabot grouped updates: one PR a month, CVEs instant

#dependabot #github #supplychainsecurity #dependencymanagement
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9 min read
Fix your agent tool instructions: GitHub's 20% review-cost cut
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Fix your agent tool instructions: GitHub's 20% review-cost cut

#aicodingagents #tooldesign #mcp #developertooling
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10 min read
Set up AI Gateway for Workers AI: one argument, every call logged
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Set up AI Gateway for Workers AI: one argument, every call logged

#aiengineering #cloudflare #workersai #observability
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11 min read
Fix the Datasette SQL Injection: Why execute-sql Won't Save You
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Fix the Datasette SQL Injection: Why execute-sql Won't Save You

#webengineering #security #sqlinjection #sqlite
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9 min read
Configuring AI Agent Permissions: Humans Miss 1 in 3 Threats
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Configuring AI Agent Permissions: Humans Miss 1 in 3 Threats

#aisecurity #aicodingagents #claudecode #permissions
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11 min read
How to Make Your Site Agent-Readable: 4 Layers, One Worker
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How to Make Your Site Agent-Readable: 4 Layers, One Worker

#agenticweb #webengineering #mcp #cloudflare
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10 min read
Run agent tool calls in parallel: 10 turns become 2 DAG levels
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Run agent tool calls in parallel: 10 turns become 2 DAG levels

#agentarchitecture #parallelism #agentharness #observability
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10 min read
Ads for AI Agents: TIME Serves Crawlers a Different Site
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Ads for AI Agents: TIME Serves Crawlers a Different Site

#aiagents #agenticweb #webengineering #geo
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10 min read
Reinforcement Fine-Tuning: When a 4B Model Beats GPT-5.6
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Reinforcement Fine-Tuning: When a 4B Model Beats GPT-5.6

#llmengineering #finetuning #rag #reinforcementlearning
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10 min read
Rust LLM Policy: Use AI to Review, Not to Create
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Rust LLM Policy: Use AI to Review, Not to Create

#opensource #aicodingagents #rust #codereview
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10 min read
MCP Write Controls: Lessons from Cloudflare WriteGuard
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MCP Write Controls: Lessons from Cloudflare WriteGuard

#mcp #aiagents #aisecurity #cloudflare
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12 min read
Insider Threat Offboarding Controls: The Apple v. OpenAI Lesson
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Insider Threat Offboarding Controls: The Apple v. OpenAI Lesson

#aisecurity #insiderthreat #offboarding #tradesecrets
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10 min read
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