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Pragmatic Software Engineering Stories,

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The database that was quietly eating itself

P50, P90, and P99 alerts keep firing. APIs are slow. You investigate. A slow-burning incident story about a database degrading itself over time.

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Debugging a website that worked on every device except mine

A debugging story: a colleague could not open go.dev on a work laptop, though it worked on every other device. Tried browsers and DNS. Nothing worked.

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A curious case of Postgres choosing the wrong index

A core feature goes down for some users during peak traffic. You're on call. A story about Postgres picking the wrong index and what it took to fix it.

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Data engineering mystery - rerouting large data in Kafka

You're a tech lead pulled into a Kafka issue by a colleague. A data engineering mystery about rerouting large-scale data without breaking the pipeline.

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The Mystery of Failing Database Writes

You're on call when a PagerDuty alert fires for the main transactional database. An SRE story about diagnosing failing writes under pressure.

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A story about a nightmare scenario for every SRE

A cloud security failure wakes you up via an AWS billing alarm. A story about why good engineering practices matter during the One-to-N journey.

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Curious case of debugging failing webhook API requests

A short debugging story: a third party gets a 500 error from our webhook API over the internet, and the team traces why the requests were failing.

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A curious story of debugging Machine Learning model performance

You're woken up by a p90 latency-related alert. This alert is for the main API service, so you start investigating right away.

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Database Reliability - Migrating Terabyte from self-hosted MySQL to GCP CloudSQL

You manage a 6-node self-hosted MySQL cluster with 1.5TB on production. The CTO wants to move to a managed service. A harder migration than expected.

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Database Reliability - Zero Downtime Schema Migrations with MySQL

You join a team as lead SRE, and the CTO asks you to manage and scale a self-managed 6-node MySQL cluster on production.

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Migrating Terabytes of metrics data with zero downtime

You run VictoriaMetrics at 30M time series per minute. The CTO wants costs cut without compromising reliability. A zero-downtime migration story.

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Building Pull Request-based ephemeral Preview environments on Kubernetes

A CTO wants Heroku-style ephemeral preview apps rebuilt on Kubernetes after migrating to AWS EKS. A story about making it work from scratch.

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My app is slow. Can you fix it?

A freshly funded founder calls you to fix webapp performance problems. A story about diagnosing slow systems under pressure with no context.

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Taming GCP networking cloud costs

Here's a story of a pragmatic tech lead who understands networking fundamentals like iptables, packet routing and NAT saved thousands of $$$ on cloud costs.

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A case of Terabyte scale backup and recovery solution

You're tasked with backing up 1.5TB of data daily to S3. You start asking questions. A story about designing backup systems at terabyte scale.

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Not all debugging stories have a happy ending

You migrated services from VMs to Kubernetes. Everything works except one service. A story about deciding which problems are worth solving.

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A curious case of slow APIs

On your first day as tech lead, the CTO says the video processing API is slow and points at AWS EFS. A story about finding the real cause.

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Unblocking Team members

A teammate has been blocked for two days without AWS credentials. A story about ownership, communication, and how blockers compound silently.

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Blogs.

Illustration of a laptop and browser windows on a deep crimson background crossed with red circuit-like lines

Read Blog

How to fix the eMudhra CA compromise on macOS

Saurabh Hirani

Principal SRE @One2N

Spandan Ghosh

Content @One2N

How to fix the eMudhra CA compromise on a Mac: clean the CA bundles curl reads, update Node, Python, Go and Java, and prove each fix with a probe.

October 22, 2026 | 12 min read

Illustration on a navy background of a terminal running exec 3<>/dev/tcp/host/443, cabled into a network socket, next to a dashed folder labelled /dev/tcp that does not exist

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How to test TCP connectivity without curl using bash /dev/tcp

Saurabh Hirani

Principal SRE @One2N

No curl, wget or nc on a locked-down box? Use bash /dev/tcp to check if a port is open and read HTTP endpoints, and learn why it fails in zsh.

October 1, 2026 | 7 min read

Illustration of a wall clock at 2:00 beside versioned policy cards v17 and v18 with a W+1 window token tag, above a stream of events

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Temporal versioning to stop config drift in stream processing

Kalpesh Deo

Staff software engineer-II @One2N

How temporal versioning with effective-time configuration and window tokens stops configuration drift across tenant time zones, rollovers and event replay.

September 30, 2026 | 13 min read

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Why your EKS Auto Mode NodeClass keeps reverting to default

Ananya Dasgupta

SRE @One2N

EKS Auto Mode reverted our default NodeClass after Argo CD synced secondary CIDR pod subnets. Why Auto Mode owns that object and what to change instead.

September 21, 2026 | 6 min read

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OpenSearch Workload Management (WLM) for heavy search queries

Srivatsa RV

SRE @One2N

OpenSearch Workload Management puts heavy report queries and product search in separate workload groups with CPU, memory, timeout and shard limits.

September 10, 2026 | 6 min read

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How to evaluate AI SRE agents for production?

Hemant Kumar

Staff SRE @One2N

How we evaluate AI SRE agents before they touch a production incident, applied to an OpenSRE v0.1 PoC and scored on how fast it helps isolate a fault.

August 11, 2026 | 12 min read

Blogs

Blogs.

Read Blog

How to fix the eMudhra CA compromise on macOS

Saurabh Hirani

Principal SRE @One2N

Spandan Ghosh

Content @One2N

How to fix the eMudhra CA compromise on a Mac: clean the CA bundles curl reads, update Node, Python, Go and Java, and prove each fix with a probe.

October 22, 2026 | 12 min read

Read Blog

How to test TCP connectivity without curl using bash /dev/tcp

Saurabh Hirani

Principal SRE @One2N

No curl, wget or nc on a locked-down box? Use bash /dev/tcp to check if a port is open and read HTTP endpoints, and learn why it fails in zsh.

October 1, 2026 | 7 min read

Read Blog

Temporal versioning to stop config drift in stream processing

Kalpesh Deo

Staff software engineer-II @One2N

How temporal versioning with effective-time configuration and window tokens stops configuration drift across tenant time zones, rollovers and event replay.

September 30, 2026 | 13 min read

Blogs

Blogs.

Read Blog

How to fix the eMudhra CA compromise on macOS

Saurabh Hirani

Principal SRE @One2N

Spandan Ghosh

Content @One2N

How to fix the eMudhra CA compromise on a Mac: clean the CA bundles curl reads, update Node, Python, Go and Java, and prove each fix with a probe.

October 22, 2026 | 12 min read

Read Blog

How to test TCP connectivity without curl using bash /dev/tcp

Saurabh Hirani

Principal SRE @One2N

No curl, wget or nc on a locked-down box? Use bash /dev/tcp to check if a port is open and read HTTP endpoints, and learn why it fails in zsh.

October 1, 2026 | 7 min read

Read Blog

Temporal versioning to stop config drift in stream processing

Kalpesh Deo

Staff software engineer-II @One2N

How temporal versioning with effective-time configuration and window tokens stops configuration drift across tenant time zones, rollovers and event replay.

September 30, 2026 | 13 min read

Blogs