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Pragmatic Software Engineering Stories,

A curious case of Postgres choosing the wrong index
It’s a regular weekday. You're catching up on Slack, sipping your morning coffee. Then pings start coming in. A core feature on the user dashboard is down for some users. Not flaky. Down. In peak traffic hours. Support is escalating. You’re on call that week. You jump in.
A curious case of Postgres choosing the wrong index
It’s a regular weekday. You're catching up on Slack, sipping your morning coffee. Then pings start coming in. A core feature on the user dashboard is down for some users. Not flaky. Down. In peak traffic hours. Support is escalating. You’re on call that week. You jump in.
Data engineering mystery - rerouting large data in Kafka
You're a tech lead handling a large-scale data pipeline. One day, your colleague (C) pulls you into an issue related to Kafka. Here's the conversation with your colleague.
Data engineering mystery - rerouting large data in Kafka
You're a tech lead handling a large-scale data pipeline. One day, your colleague (C) pulls you into an issue related to Kafka. Here's the conversation with your colleague.
The Mystery of Failing Database Writes
As an SRE at a growth-stage company, you're on call this week. A PagerDuty alert wakes you up. It's related to the main transactional database, so you check immediately.
The Mystery of Failing Database Writes
As an SRE at a growth-stage company, you're on call this week. A PagerDuty alert wakes you up. It's related to the main transactional database, so you check immediately.
A story about a nightmare scenario for every SRE
Story time, it's about cloud security failures and why good engineering practices matter, especially during the One to N journey. As a team lead, you're woken up by an AWS billing alarm!
A story about a nightmare scenario for every SRE
Story time, it's about cloud security failures and why good engineering practices matter, especially during the One to N journey. As a team lead, you're woken up by an AWS billing alarm!
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.
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.
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're a lead SRE and CTO asks you to manage and scale a self-managed 6-node MySQL cluster with 1.5+ TB data on production. You do what it takes, a few months pass, but now, it's time to move to a managed service. You think this should be straightforward, but it's not so easy.
Database Reliability - Migrating Terabyte from self-hosted MySQL to GCP CloudSQL
You're a lead SRE and CTO asks you to manage and scale a self-managed 6-node MySQL cluster with 1.5+ TB data on production. You do what it takes, a few months pass, but now, it's time to move to a managed service. You think this should be straightforward, but it's not so easy.
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.
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're an SRE responsible for VictoriaMetrics deployment with 30 Million time series/min. The CTO wants you to drastically reduce the costs for this infra without compromising reliability.
Migrating Terabytes of metrics data with zero downtime
You're an SRE responsible for VictoriaMetrics deployment with 30 Million time series/min. The CTO wants you to drastically reduce the costs for this infra without compromising reliability.
Building Pull Request-based ephemeral Preview environments on Kubernetes
A CTO of a company calls you. They just migrated from Heroku to AWS on EKS. He's happy with the migration but wants you to build Heroku's "Ephemeral Preview Apps" on Kubernetes.
Building Pull Request-based ephemeral Preview environments on Kubernetes
A CTO of a company calls you. They just migrated from Heroku to AWS on EKS. He's happy with the migration but wants you to build Heroku's "Ephemeral Preview Apps" on Kubernetes.
My app is slow. Can you fix it?
A founder of a recently funded company calls you. He wants you to come in and fix webapp performance problems. You have been in similar situations before and want another thrill, so you say:
My app is slow. Can you fix it?
A founder of a recently funded company calls you. He wants you to come in and fix webapp performance problems. You have been in similar situations before and want another thrill, so you say:
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 $$$ on cloud costs.
Taming GCP networking cloud costs
Here's a story of a pragmatic tech lead who understands networking fundamentals like iptables, packet routing and NAT saved thousands of $$$ on cloud costs.
A case of Terabyte scale backup and recovery solution
You are a tech lead who's tasked to backup 1.5TB (yes, not a typo, a terabyte) of data DAILY to S3. You're not really sure about any other background about this requirement, so you start asking some questions:
A case of Terabyte scale backup and recovery solution
You are a tech lead who's tasked to backup 1.5TB (yes, not a typo, a terabyte) of data DAILY to S3. You're not really sure about any other background about this requirement, so you start asking some questions:
Not all debugging stories have a happy ending
Sometimes you have to decide what problems are worth solving and only focus on those. You migrate application services running on VMs to K8s. Everything works fine, except for one service.
Not all debugging stories have a happy ending
Sometimes you have to decide what problems are worth solving and only focus on those. You migrate application services running on VMs to K8s. Everything works fine, except for one service.
A curious case of slow APIs
You're a tech lead who's just joined a team and on your first day, the CTO tells you: "Our video processing API is very slow, looks like it's a problem with AWS EFS that we are using. Take a look and fix it."
A curious case of slow APIs
You're a tech lead who's just joined a team and on your first day, the CTO tells you: "Our video processing API is very slow, looks like it's a problem with AWS EFS that we are using. Take a look and fix it."
Unblocking Team members
Teammate(T): Hey, I am blocked since I don't have AWS access credentials for the last 2 days. I am unable to proceed with any work. You: Well, have you raised a request to get the credentials?
Unblocking Team members
Teammate(T): Hey, I am blocked since I don't have AWS access credentials for the last 2 days. I am unable to proceed with any work. You: Well, have you raised a request to get the credentials?

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Our blogs.

DORA Metrics: Useful or Fluff

Jaideep Khandelwal

Founder, CTO @One2N

In this post, we shed light on why following DORA metrics without context might cause more harm than good. We also show how leaders can use a practical, strategic approach to connect DORA metrics to meaningful business outcomes.

September 3, 2025 | 14 min read

A pragmatic guide to OpenTelemetry

Spandan Ghosh

Content @One2N

A guide explaining OTEL, monitoring vs. observability, telemetry’s pillars, OTEL instrumentation, and seamless backend migration. Includes practical migration strategies and trade-offs for SREs adopting OTEL.

August 20, 2025 | 5 min read

How we solved a critical site-to-site VPN IP address conflict in AWS

Rishiraj Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

How One2N solved a critical site-to-site VPN IP address conflict in AWS, including details on the problem, failed solutions, and the final parallel system approach that worked with automation.

July 15, 2025 | 7 min read

DARE to question your alerts?

Saurabh Hirani

Principal SRE @One2N

Alert fatigue is real and it's hurting your on-call teams. This post breaks down how to make alerting systems smarter through regular alert analysis. Learn how to turn noisy alerts into actionable insights that drive real resilience.

June 25, 2025 | 3 min read

Implementing secure error handling in Go for B2B SaaS applications

Mohit Kumar

Software Engineer

A centralized error handling library helped our team improve user experience and strengthen security in Go-based microservices by replacing leaky, inconsistent error messages with structured, user-friendly responses.

June 18, 2025 | 5 min read

Deploying a scalable NATS cluster part 1: core architecture and considerations

Barun Debnath

SRE @One2N

In this blog, we provide a detailed overview of the NATS architecture, key cluster design considerations, and best practices for deploying a scalable and reliable NATS messaging system. We cover topics like high availability, fault tolerance, message durability, and the infrastructure requirements.

June 4, 2025 | 5 min read

Blog

Our blogs.

DORA Metrics: Useful or Fluff

Jaideep Khandelwal

Founder, CTO @One2N

In this post, we shed light on why following DORA metrics without context might cause more harm than good. We also show how leaders can use a practical, strategic approach to connect DORA metrics to meaningful business outcomes.

September 3, 2025 | 14 min read

A pragmatic guide to OpenTelemetry

Spandan Ghosh

Content @One2N

A guide explaining OTEL, monitoring vs. observability, telemetry’s pillars, OTEL instrumentation, and seamless backend migration. Includes practical migration strategies and trade-offs for SREs adopting OTEL.

August 20, 2025 | 5 min read

How we solved a critical site-to-site VPN IP address conflict in AWS

Rishiraj Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

How One2N solved a critical site-to-site VPN IP address conflict in AWS, including details on the problem, failed solutions, and the final parallel system approach that worked with automation.

July 15, 2025 | 7 min read

Blog

Our blogs.

DORA Metrics: Useful or Fluff

Jaideep Khandelwal

Founder, CTO @One2N

In this post, we shed light on why following DORA metrics without context might cause more harm than good. We also show how leaders can use a practical, strategic approach to connect DORA metrics to meaningful business outcomes.

September 3, 2025 | 14 min read

A pragmatic guide to OpenTelemetry

Spandan Ghosh

Content @One2N

A guide explaining OTEL, monitoring vs. observability, telemetry’s pillars, OTEL instrumentation, and seamless backend migration. Includes practical migration strategies and trade-offs for SREs adopting OTEL.

August 20, 2025 | 5 min read

How we solved a critical site-to-site VPN IP address conflict in AWS

Rishiraj Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

How One2N solved a critical site-to-site VPN IP address conflict in AWS, including details on the problem, failed solutions, and the final parallel system approach that worked with automation.

July 15, 2025 | 7 min read

Blog