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Pragmatic Software Engineering Stories,

Read PSES

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.

Read PSES

Debugging a website that worked on every device except mine

Debugging a website that worked on every device except mine. Storytime! Colleague: Hey, can anyone help? I can't access go.dev on my work laptop. Tried different browsers, cleared DNS cache, nothing works.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

Curious case of debugging failing webhook API requests

A short debugging story to start off the new year. Dev: Our backend has a webhook API that a third party will invoke over the internet. The customer team from that third party is on the call. They are getting a 500 error when making this API call.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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.

Read PSES

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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Get the latest in software engineering best practices straight to your inbox. Subscribe now!

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Get the latest in software engineering best practices straight to your inbox. Subscribe now!

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Get the latest in software engineering best practices straight to your inbox. Subscribe now!

Blogs.

Read Blog

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Harshwardhan Mehrotra

SRE @One2N

Spandan Ghosh

Content @One2N

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

June 1, 2026 | 7 min read

Read Blog

Git was not built for multiple AI agents. Worktrees fix that.

Srivatsa RV

SRE @One2N

Spandan Ghosh

Content @One2N

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

May 26, 2026 | 6 min read

Read Blog

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

Harsh Mishra

SRE @One2N

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

April 28, 2026 | 7 min read

Read Blog

Multi-Tenant SFTP: How We Built a Zero-Ops Setup on AWS Transfer Family

Kshitish Deshpande

Software Engineer @One2N

How One2N built a zero-ops multi-tenant SFTP system for a fintech client using AWS Transfer Family: one endpoint, isolated buckets, no manual server ops.

April 20, 2026 | 6 min read

Read Blog

My new laptop broke Slack. That's how I ended up on Bluefin.

Harsh Mishra

SRE @One2N

Spandan Ghosh

Content @One2N

A kernel patch broke Slack on my Dell XPS. Here's how that led me to Bluefin, immutable Linux, bootc, and OCI images and why it solved my problem for good.

April 1, 2026 | 7 min read

Read Blog

Shooting ourselves in the foot by enabling Spring Kafka batching

Mahesh Aravind

SDE @One2N

We enabled Spring Kafka batch listeners to improve throughput and broke non-blocking retries. Here's what went wrong and what actually fixed it.

March 16, 2026 | 4 min read

Blogs

Blogs.

Read Blog

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Harshwardhan Mehrotra

SRE @One2N

Spandan Ghosh

Content @One2N

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

June 1, 2026 | 7 min read

Read Blog

Git was not built for multiple AI agents. Worktrees fix that.

Srivatsa RV

SRE @One2N

Spandan Ghosh

Content @One2N

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

May 26, 2026 | 6 min read

Read Blog

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

Harsh Mishra

SRE @One2N

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

April 28, 2026 | 7 min read

Blogs

Blogs.

Read Blog

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Harshwardhan Mehrotra

SRE @One2N

Spandan Ghosh

Content @One2N

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

June 1, 2026 | 7 min read

Read Blog

Git was not built for multiple AI agents. Worktrees fix that.

Srivatsa RV

SRE @One2N

Spandan Ghosh

Content @One2N

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

May 26, 2026 | 6 min read

Read Blog

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

Harsh Mishra

SRE @One2N

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

April 28, 2026 | 7 min read

Blogs

Services

Resources

Company

Pragmatic Software Engineering Stories,

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.

Debugging a website that worked on every device except mine

Debugging a website that worked on every device except mine. Storytime! Colleague: Hey, can anyone help? I can't access go.dev on my work laptop. Tried different browsers, cleared DNS cache, nothing works.

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.

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.

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.

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.

Curious case of debugging failing webhook API requests

A short debugging story to start off the new year. Dev: Our backend has a webhook API that a third party will invoke over the internet. The customer team from that third party is on the call. They are getting a 500 error when making this API call.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

Git was not built for multiple AI agents. Worktrees fix that.

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

Multi-Tenant SFTP: How We Built a Zero-Ops Setup on AWS Transfer Family

How One2N built a zero-ops multi-tenant SFTP system for a fintech client using AWS Transfer Family: one endpoint, isolated buckets, no manual server ops.

My new laptop broke Slack. That's how I ended up on Bluefin.

A kernel patch broke Slack on my Dell XPS. Here's how that led me to Bluefin, immutable Linux, bootc, and OCI images and why it solved my problem for good.

Shooting ourselves in the foot by enabling Spring Kafka batching

We enabled Spring Kafka batch listeners to improve throughput and broke non-blocking retries. Here's what went wrong and what actually fixed it.

Blogs.

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

Git was not built for multiple AI agents. Worktrees fix that.

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

Blogs.

Hardening Kubernetes Security with Istio Ambient Mode on Flat Networks

Learn how One2N used Istio Ambient mode to enforce zero-trust security on a flat EKS Hybrid network - with mTLS, SPIFFE identity, egress control, and NetworkPolicies.

Git was not built for multiple AI agents. Worktrees fix that.

Running multiple AI coding agents on the same repo? Git's single-checkout model breaks fast. Learn how git worktrees give each agent its own isolated workspace.

How one parameter stalled Postgres Replication with Debezium for 3 Weeks

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.