Yoshik Karnawat

SRE @PhonePe

Digest

#29 Uptime Sync: Region Switches, Kafka Performance, and the Kubernetes Failures

Aug 1, 2026

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2 min read

#29 Uptime Sync: Region Switches, Kafka Performance, and the Kubernetes Failures

Game-day traffic recovery, 10 billion webhooks a month, AI cost controls, and the production issues that appear only when systems are under pressure

Yoshik Karnawat

Linux

Jul 29, 2026

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9 min read

Linux Processes That Do Nothing, Explained

States, Threads, I/O Waits, and /proc Deep Dive

Yoshik Karnawat

Digest

#28 Uptime Sync: The Security Gaps, Database Regressions, and Failovers That Hurt in Production

Jul 26, 2026

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2 min read

#28 Uptime Sync: The Security Gaps, Database Regressions, and Failovers That Hurt in Production

From compromised release branches and silent PostgreSQL defaults to chaos-tested Kubernetes operators and high-availability systems that still brown out

Yoshik Karnawat

Networking

Jul 22, 2026

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9 min read

How TLS Works - Deep Dive

Inside the TLS Handshake: How Certificates, Key Exchange, and Latency Shape Your HTTPS Performance

Yoshik Karnawat

Digest

#27 Uptime Sync: DNS Failures, Million-Sandbox Scale, and the Kubernetes Risks

Jul 19, 2026

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2 min read

#27 Uptime Sync: DNS Failures, Million-Sandbox Scale, and the Kubernetes Risks

Production failures, infrastructure at extreme scale, and the security gaps that can turn a small misconfiguration into a cluster takeover

Yoshik Karnawat

Cloud

Jul 13, 2026

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10 min read

AWS IAM Simply Explained

IAM Deep Dive. Bookmark this.

Yoshik Karnawat

Digest

#26 Uptime Sync: The Rewrite Trap, PostgreSQL at Scale, and the Costs That Show Up After Launch

Jul 12, 2026

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2 min read

#26 Uptime Sync: The Rewrite Trap, PostgreSQL at Scale, and the Costs That Show Up After Launch

Why working code gets replaced too early, databases become harder to operate than expected, and real infrastructure costs begin after the demo

Yoshik Karnawat

DevOps

I Don’t Chase Every New Tool Anymore. I Test, Compare, and Move On

Jul 8, 2026

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7 min read

I Don’t Chase Every New Tool Anymore. I Test, Compare, and Move On

The advice I'd give every junior DevOps and SRE engineer starting today.

Yoshik Karnawat

Digest

#25 Uptime Sync: Homelabs That Maintain Themselves, PostgreSQL Superpowers, and the AI Bill Nobody Expected

Jul 6, 2026

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2 min read

#25 Uptime Sync: Homelabs That Maintain Themselves, PostgreSQL Superpowers, and the AI Bill Nobody Expected

Self-managing infra, transaction-powered workflows, and the practical lessons hiding behind retry storms, pager fatigue, and simpler stacks

Yoshik Karnawat

DevOps

21 Lessons I Learned in My First 3 Years as an SRE

Jun 28, 2026

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3 min read

21 Lessons I Learned in My First 3 Years as an SRE

The advice I'd give every junior DevOps and SRE engineer starting today.

Yoshik Karnawat

Digest

#24 Uptime Sync: Terminal Workflows, PostgreSQL Enough, and the Tools That Still Win

Jun 26, 2026

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1 min read

#24 Uptime Sync: Terminal Workflows, PostgreSQL Enough, and the Tools That Still Win

Practical infra lessons, zero-downtime migrations, and simple systems that keep outperforming fashionable stacks

Yoshik Karnawat

Jun 22, 2026

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9 min read

Eventual Consistency

How Dynamo, Cassandra, and Cosmos DB Choose Availability Over Immediate Agreement

Yoshik Karnawat

System Design

Jun 17, 2026

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12 min read

DevOps vs MLOps vs AIOps

What Each One Actually Does (and When You Need Which)

Yoshik Karnawat

Digest

#23 Uptime Sync: ClickHouse Bottlenecks, Rust Migrations, and the AI Hype Check

Jun 12, 2026

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2 min read

#23 Uptime Sync: ClickHouse Bottlenecks, Rust Migrations, and the AI Hype Check

Hidden pipeline slowdowns, kube-native platform shifts, and the engineering lessons freshers need before the hype overwhelms them

Yoshik Karnawat

System Design

Jun 9, 2026

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14 min read

WhatsApp Architecture

The System That Scaled to Billions on 550 Servers

Yoshik Karnawat

Digest

#22 Uptime Sync: Kafka Upgrades, AI Security Chaos, and the Cloud Patterns That Actually Matter

Jun 6, 2026

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2 min read

#22 Uptime Sync: Kafka Upgrades, AI Security Chaos, and the Cloud Patterns That Actually Matter

From KRaft migrations and Kubernetes networking to idempotency, PostgreSQL hacks, and the new flood of AI-generated security reports

Yoshik Karnawat

Networking

Jun 1, 2026

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11 min read

How IP Addressing Actually Works

Subnetting, CIDR, and NAT

Yoshik Karnawat

Digest

#21 Uptime Sync: GitHub’s Reliability Crisis, Supply Chain Malware, and the Kubernetes Bottlenecks Nobody Sees

May 30, 2026

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2 min read

#21 Uptime Sync: GitHub’s Reliability Crisis, Supply Chain Malware, and the Kubernetes Bottlenecks Nobody Sees

Failure modes in cloud-native systems, supply chain compromise, and the production gaps that surface only when traffic, tooling, and scale collide

Yoshik Karnawat

Networking

May 27, 2026

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9 min read

TCP Handshake - Deep Dive

Three packets. Everything else follows.

Yoshik Karnawat

Digest

#20 Uptime Sync: Amazon DC Repairs, Cloudflare’s Linux Vulnerability, and GitHub’s Crisis

May 23, 2026

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2 min read

#20 Uptime Sync: Amazon DC Repairs, Cloudflare’s Linux Vulnerability, and GitHub’s Crisis

Hidden failure modes in cloud infrastructure, zero-downtime database upgrades, and the production bottlenecks most teams only notice when they’re already on fire

Yoshik Karnawat

Digest

#19 Uptime Sync: Github Code Leak, ClickHouse Bottleneck, Lambda's Invisible Network

May 21, 2026

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2 min read

#19 Uptime Sync: Github Code Leak, ClickHouse Bottleneck, Lambda's Invisible Network

Hidden contention in billing pipelines, security-driven pipeline hardening, and the engineering behind cloud systems most teams never see

Yoshik Karnawat

Digest

#18 Uptime Sync: Terraform's Quiet Decline, AI's Junior Dev Killer, and SSH Honeypot's 269K Attackers

May 9, 2026

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2 min read

#18 Uptime Sync: Terraform's Quiet Decline, AI's Junior Dev Killer, and SSH Honeypot's 269K Attackers

Port 22 exposed for 54 days, the cognitive overload of AI coding tools, and why software engineers solve problems, not write code

Yoshik Karnawat

Linux

May 5, 2026

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9 min read

Process, Threads, Tasks

Engineers use the words process, thread, and task interchangeably. They are not the same thing.

Yoshik Karnawat

Digest

#17 Uptime Sync: AI Coding's Junior Dev Killer, RFCs as the Ultimate Engineering Skill

May 2, 2026

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2 min read

#17 Uptime Sync: AI Coding's Junior Dev Killer, RFCs as the Ultimate Engineering Skill

Microsoft's AI agent career warnings, Istio's registry migration fallout, and the chaos engineering practices that actually ship to production

Yoshik Karnawat

May 1, 2026

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1 min read

Cracking SRE

Built from my experience working as SRE at a US startup, PhonePe, KayHosting, this guide covers the concepts, questions, and practical thinking you actually need to crack SRE interviews.

Yoshik Karnawat

Yoshik Karnawat

#29 Uptime Sync: Region Switches, Kafka Performance, and the Kubernetes Failures

Linux Processes That Do Nothing, Explained

#28 Uptime Sync: The Security Gaps, Database Regressions, and Failovers That Hurt in Production

How TLS Works - Deep Dive

#27 Uptime Sync: DNS Failures, Million-Sandbox Scale, and the Kubernetes Risks

AWS IAM Simply Explained

#26 Uptime Sync: The Rewrite Trap, PostgreSQL at Scale, and the Costs That Show Up After Launch

I Don’t Chase Every New Tool Anymore. I Test, Compare, and Move On

#25 Uptime Sync: Homelabs That Maintain Themselves, PostgreSQL Superpowers, and the AI Bill Nobody Expected

21 Lessons I Learned in My First 3 Years as an SRE

#24 Uptime Sync: Terminal Workflows, PostgreSQL Enough, and the Tools That Still Win

Eventual Consistency

DevOps vs MLOps vs AIOps

#23 Uptime Sync: ClickHouse Bottlenecks, Rust Migrations, and the AI Hype Check

WhatsApp Architecture

#22 Uptime Sync: Kafka Upgrades, AI Security Chaos, and the Cloud Patterns That Actually Matter

How IP Addressing Actually Works

#21 Uptime Sync: GitHub’s Reliability Crisis, Supply Chain Malware, and the Kubernetes Bottlenecks Nobody Sees

TCP Handshake - Deep Dive

#20 Uptime Sync: Amazon DC Repairs, Cloudflare’s Linux Vulnerability, and GitHub’s Crisis

#19 Uptime Sync: Github Code Leak, ClickHouse Bottleneck, Lambda's Invisible Network

#18 Uptime Sync: Terraform's Quiet Decline, AI's Junior Dev Killer, and SSH Honeypot's 269K Attackers

Process, Threads, Tasks

#17 Uptime Sync: AI Coding's Junior Dev Killer, RFCs as the Ultimate Engineering Skill

Cracking SRE

The Uptime Engineer