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Case Studies

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Kong API Gateway for Gaming and Sports Betting Integrations

How we used Kong Gateway and Lua to decouple legacy wallet systems and accelerate global expansion for a Tier‑1 gaming enterprise.

Cover image for the case study Migrating from AWS Glue to Self-Hosted ClickHouse: 70% Cost Reduction for a Fintech Clien

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Migrating from AWS Glue to Self-Hosted ClickHouse: 70% Cost Reduction for a Fintech Client.

How One2N cut a fintech client's analytics spend from $13K to $4K/month by replacing AWS Glue, DMS, and Athena with a self-hosted ClickHouse stack.

Cover image for the case study How we reduced Kafka message latency by 90% and increased throughput 4x for a $300M SaaS

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How we reduced Kafka message latency by 90% and increased throughput 4x for a $300M SaaS platform.

How One2N reduced Kafka message latency by 90% and increased throughput 4x for a $300M SaaS platform, while cutting AWS infrastructure costs by 40%.

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How we saved more than 42% on AWS Infrastructure Costs.

How One2N helped a no-code Shopify platform cut AWS infrastructure costs by 42% without affecting uptime, with savings on compute, RDS, and data transfer.

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AutoScaling eKYC Machine Learning workloads to 2 Million req/day.

How One2N autoscaled eKYC ML workloads to 2 million requests per day with 90% cost savings, 99% availability, and sub-3-second P95 API latency.

Blogs

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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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Multi-tenant SFTP: how we built a zero-ops setup on AWS Transfer Family

Kshitish Deshpande

Software Engineer @One2N

Spandan Ghosh

Content @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

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

Rishiraj Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

A site-to-site VPN in AWS came up but every request timed out: both sides used 10.0.0.0/22. Why a secondary CIDR failed and the parallel setup that worked.

July 15, 2025 | 7 min read

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EKS upgrade best practices: how to upgrade EKS clusters safely

Aashi Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

EKS upgrade checklist from our v1.23 to v1.30 move: control plane checks, VPC CNI, CoreDNS and kube-proxy add-ons, Velero backups and node group upgrades.

March 25, 2025 | 5 min read

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AWS SSM port forwarding to private EC2 without SSH or bastions

Harsh Mishra

SRE

AWS SSM port forwarding to EC2 in private subnets with Session Manager, with no open SSH port or bastion. Covers the IAM role, SSM Agent and endpoints.

March 10, 2025 | 5 min read

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Gotchas to avoid when using AWS spot instances in production

Aashi Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

AWS spot instances in production on EKS: two-minute termination notices, ignored PodDisruptionBudgets, slow replacement capacity and a real outage we had.

February 24, 2025 | 4 min read

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Accessing private EC2 Instances without keys or passwords

Adarsh Raj

SRE

Spandan Ghosh

Content @One2N

Access private EC2 instances without SSH keys or passwords using AWS Systems Manager Session Manager: no public IPs, no inbound rules, and no shared keys.

December 3, 2024 | 7 min read

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Karpenter vs Cluster Autoscaler for Kubernetes node scaling

Rahul H Bhatia

SRE

Spandan Ghosh

Content @One2N

Karpenter vs Cluster Autoscaler: how each scales Kubernetes nodes, from predefined node groups and priority expanders to provisioning and cost trade-offs.

November 8, 2024 | 7 min read

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Setting up CloudWatch alerts for EKS clusters: insights and solutions

Mihir Bhagwat

SRE @One2N

Saurabh Hirani

Principal SRE @One2N

Spandan Ghosh

Content @One2N

CloudWatch alerts for EKS node readiness with Container Insights: per-node alarms for static nodes, then Metric Insights and MIN(MIN) for autoscaled ones.

August 30, 2024 | 6 min read

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Achieving CI/CD with previews for your static website hosted on S3

Drasti Kaurav

SRE @One2N

CI/CD for a static website on S3 with preview environments: automated builds and deploys without developer AWS keys, plus CloudFront cache invalidation.

February 24, 2024 | 4 min read

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Exposing SaaS APIs privately to customers with AWS PrivateLink

Siddharth Mishra

SRE

Expose SaaS API endpoints privately with AWS PrivateLink, not VPC peering, which breaks on overlapping CIDRs. Same-region latency fell from 0.21s to 0.08s.

December 25, 2023 | 5 min read

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AWS SSO with the Go SDK: making SSO auth work in Golang

Chinmay Somani

SRE

Why AWS SSO profiles fail with the AWS SDK for Go v1, and the two fixes: change your ~/.aws/config, or upgrade to the v2 SDK.

October 25, 2023 | 7 min read

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Automate RDS secret management using AWS Secrets Manager

Siddharth Shashikar

SRE @One2N

Manage and rotate RDS credentials with AWS Secrets Manager: compare ways to store RDS secrets, then automate creation and rotation with Terraform.

July 14, 2023 | 8 min read

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Terraform: best practices & gotchas

Siddharth Shashikar

SRE @One2N

Terraform best practices and gotchas for infrastructure as code: directory structure, module organisation, naming conventions and state management.

May 27, 2022 | 10 min read

Talks

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AWS Billing Nightmares: Hidden Costs That Can Burn Your Budget | One2N Bits Ep. 1

Pranay Narang

SRE @One2N

Chinmay Naik

CEO @One2N

Real AWS billing horror stories: idle EBS costs, sneaky networking fees, and the public IP billing spike that catches even experienced teams off guard.

July 28, 2025 | 5 min

Watch Talk

ABC of LLMOps - What does it take to run self-hosted LLMs｜Rootconf mini 2024

Jaideep Khandelwal

CTO @One2N

Lessons from deploying open-source LLMs on Kubernetes GPUs, managing vector databases and building RAG apps, from Rootconf mini 2024.

February 5, 2025 | 31 min

Watch Talk

Introducing Cloudlens - Cloud Console in your terminal

Chinmay Naik

CEO @One2N

Chinmay Naik introduces Cloudlens, an open source k9s-style terminal UI for exploring AWS and GCP resources, from Google DevFest Chennai 2023.

February 21, 2024 | 15 min

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Cloudlens AWS console in your terminal

Chinmay Naik

CEO @One2N

A talk on Cloudlens, One2N's open source tool written in Go that brings the AWS console into your terminal, and how we built and use it.

September 9, 2023 | 2 min

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Journey of AWS Cost Optimization - Cloud cost conference

Sitaram Shelke

SRE

How we cut cloud spend by 42% for an e-commerce client during the pandemic, with the AWS cost optimization steps that delivered the savings.

August 18, 2023 | 21 min

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