DEV Community: Emmanuella A.

I Deployed on Friday and Broke Production. Here's What I Built to Never Do That Again.

Emmanuella A. — Sun, 23 Nov 2025 17:25:10 +0000

The 3AM Wake-Up Call

It was a Friday afternoon. 4:47 PM. The new checkout flow was ready. Tests passed. Code review approved.

I hit deploy.

Everything looked fine for about 6 minutes.

Then Slack exploded. Payment processing was broken. Customers couldn't complete purchases. Revenue was literally stopping.

My hands were shaking as I tried to rollback. Git revert. Push. Wait for CI/CD.

22 minutes of downtime.
Twenty-two minutes of lost revenue. Twenty-two minutes of support tickets flooding in. Twenty-two minutes of pure panic.

That night, I couldn't sleep. Not because of the incident (those happen), but because I kept thinking: "There has to be a better way."

The Real Problem with Deployments
Here's the thing every developer knows but rarely admits:

We're all afraid to deploy on Fridays.

Not because we're bad at our jobs. Not because our code is untested. But because when something goes wrong, the "fix" is brutal:

Realize there's a problem
Figure out which commit caused it
Revert the changes
Wait for CI/CD (10-20 minutes minimum)
Hope the rollback doesn't introduce new bugs
Write incident report
The average "emergency rollback" takes 15-25 minutes.

In that time:

Revenue is lost
Users are frustrated
Your heart rate is through the roof
Your weekend is ruined

What I Learned the Hard Way
After that Friday incident, I started researching how big tech companies handle this.

Google deploys 50+ times per day. Amazon deploys every 11.6 seconds. Netflix pushes thousands of times daily.

Their secret? Feature flags.
But here's the catch: when I tried existing feature flag tools, I ran into new problems:

LaunchDarkly : specific amount/month for my 5-person team. Setup took 3+ hours reading documentation.

Flagsmith : Free, but required self-hosting, Docker setup, database configuration. Another weekend project.

ConfigCat : Better, but still required config files, environment variables, and complex SDK initialization.

For small teams and indie developers, these felt like bringing a bazooka to a water balloon fight.

I just wanted to:

Deploy safely
Rollback instantly if needed
Not spend $200/month or a weekend setting up infrastructure
So I built something simpler.

Introducing FlagSwift

After that 3AM wake-up call, I spent the next few weeks building what I wish I had that Friday:

The core idea : Feature flags that take 30 seconds to set up and let you rollback in 2 seconds.

Here's How It Works:

Install (10 seconds)

npm install @flagswift/react-client

Wrap your app (15 seconds)

import { FlagProvider, FlagClient } from '@flagswift/react-client'

const client = new FlagClient({
  apiKey: process.env.NEXT_PUBLIC_FLAGSWIFT_API_KEY,
  environment: 'production'
})

function App() {
  return (
    <FlagProvider client={client}>
      <YourApp />
    </FlagProvider>
  )
}

Wrap any feature (5 seconds)

function CheckoutPage() {
  const newCheckoutEnabled = useFlag('new-checkout-flow')

  return newCheckoutEnabled ? <NewCheckout /> : <OldCheckout />
}

That's it. 30 seconds total.

Now when you deploy, the new checkout is hidden behind a flag. You control when it goes live.

The Magic: 2-Second Rollbacks.

Here's what would have saved me that Friday night :

Instead of:

Git revert - 2 minutes
Push to repo - 1 minute
Wait for CI/CD - 15-20 minutes
Pray it works - infinite anxiety

With FlagSwift :

Open dashboard
Click toggle
Feature disabled globally
Total time: 2 seconds.

No deployment. No waiting. No git history pollution.

Real-World Example:

How This Saves You:
Let's say you're shipping a new payment flow (just like I was):

Without Feature Flags:


// Old code
function Checkout() {
  return <OldPaymentFlow />
}
// Deploy new code - GOES LIVE IMMEDIATELY

function Checkout() {
  return <NewPaymentFlow />  // If this breaks, everyone sees it
}

If it breaks: 15-25 minute rollback via deployment.

With FlagSwift :

function Checkout() {
  const useNewPayment = useFlag('new-payment-flow')

  return useNewPayment ? <NewPaymentFlow /> : <OldPaymentFlow />
}

Deploy this code. Nothing changes for users yet.

Then:

Enable for yourself first (test in production with real data)
Enable for your QA team (5 people test it thoroughly)
Enable for 1% of users (50 people, monitor for issues)
Enable for 10% of users (500 people, looks good!)
Enable for everyone (full rollout)

If anything breaks at ANY step:

Click toggle. 2 seconds. Back to old flow.

What Makes FlagSwift Different

I've tried most feature flag tools.

Here's what I built differently:

Zero Config

No YAML files.
No environment variables (they're optional).
No complex setup.
One npm install, wrap your app, start using flags.

It's Free to Start

Unlimited flags
Unlimited environments
Unlimited team members
You only pay when you scale to high request volumes.

** User Targeting That Makes Sense**.
Want to test with specific users?

const client = new FlagClient({
  apiKey: 'your-key',
  userIdentifier: currentUser.email  // or user ID, whatever you want
})

Add their email to the dashboard. Done.

No complicated segment rules.
No user attribute schemas.
Just identifiers.

** Multi-Environment by Default**

// Development
const client = new FlagClient({ environment: 'development' })

// Staging  
const client = new FlagClient({ environment: 'staging' })

// Production
const client = new FlagClient({ environment: 'production' })

Test features locally while keeping them hidden in production.

Fast (Really Fast)

Your app checks flags instantly with zero network overhead per check.
Flags are fetched once on load and cached.
Dashboard changes propagate in ~2 seconds globally.

Current Status & What's Next

Right now, FlagSwift supports :

React (via @flagswift/react-client)
Node.js (via @flagswift/node-server)
Python (via pip install flagswift)

Coming soon:

Go SDK (for backend services)
Analytics dashboard (see which flags are actually used)
Slack notifications (get alerted when flags change)
Try It Yourself:

If you've ever been afraid to deploy on Friday, FlagSwift is for you.
FlagSwift

Free to start
30-second setup
No credit card required
Rollback any feature in 2 seconds

I built this to solve my own 3AM deployment panic. Hope it helps you avoid yours.

What's your worst deployment story?
Mine was breaking checkout on a Friday afternoon and losing 22 minutes of revenue.

What's yours?
Drop it in the comments - let's commiserate together!
And when you try FlagSwift, I'd love to hear your feedback.
What works?
What doesn't?
What features would make this a must-have for your team?

I Deployed on Friday and Broke Production. Here's What I Built to Never Do That Again.

Emmanuella A. — Sun, 23 Nov 2025 17:12:37 +0000

The 3AM Wake-Up Call

It was a Friday afternoon. 4:47 PM. The new checkout flow was ready. Tests passed. Code review approved.

I hit deploy.

Everything looked fine for about 6 minutes.

Then Slack exploded. Payment processing was broken. Customers couldn't complete purchases. Revenue was literally stopping.

My hands were shaking as I tried to rollback. Git revert. Push. Wait for CI/CD.

22 minutes of downtime.

Twenty-two minutes of lost revenue. Twenty-two minutes of support tickets flooding in. Twenty-two minutes of pure panic.

That night, I couldn't sleep. Not because of the incident (those happen), but because I kept thinking: "There has to be a better way."

The Real Problem with Deployments

Here's the thing every developer knows but rarely admits:

We're all afraid to deploy on Fridays.

Not because we're bad at our jobs. Not because our code is untested. But because when something goes wrong, the "fix" is brutal:

Realize there's a problem
Figure out which commit caused it
Revert the changes
Wait for CI/CD (10-20 minutes minimum)
Hope the rollback doesn't introduce new bugs
Write incident report

The average "emergency rollback" takes 15-25 minutes.

In that time:

Revenue is lost
Users are frustrated
Your heart rate is through the roof
Your weekend is ruined

What I Learned the Hard Way

After that Friday incident, I started researching how big tech companies handle this.

Google deploys 50+ times per day. Amazon deploys every 11.6 seconds. Netflix pushes thousands of times daily.

Their secret? Feature flags.

But here's the catch: when I tried existing feature flag tools, I ran into new problems:

LaunchDarkly : specific amount/month for my 5-person team. Setup took 3+ hours reading documentation.

Flagsmith : Free, but required self-hosting, Docker setup, database configuration. Another weekend project.

ConfigCat : Better, but still required config files, environment variables, and complex SDK initialization.

For small teams and indie developers, these felt like bringing a bazooka to a water balloon fight.

I just wanted to:

Deploy safely
Rollback instantly if needed
Not spend $200/month or a weekend setting up infrastructure

So I built something simpler.

Introducing FlagSwift

After that 3AM wake-up call, I spent the next few weeks building what I wish I had that Friday:

The core idea : Feature flags that take 30 seconds to set up and let you rollback in 2 seconds.

Here's How It Works:

Install (10 seconds)

npm install @flagswift/react-client

Wrap your app (15 seconds)

import { FlagProvider, FlagClient } from '@flagswift/react-client'

const client = new FlagClient({
  apiKey: process.env.NEXT_PUBLIC_FLAGSWIFT_API_KEY,
  environment: 'production'
})

function App() {
  return (
    <FlagProvider client={client}>
      <YourApp />
    </FlagProvider>
  )
}

Wrap any feature (5 seconds)

function CheckoutPage() {
  const newCheckoutEnabled = useFlag('new-checkout-flow')

  return newCheckoutEnabled ? <NewCheckout /> : <OldCheckout />
}

That's it. 30 seconds total.

Now when you deploy, the new checkout is hidden behind a flag. You control when it goes live.

The Magic: 2-Second Rollbacks.

Here's what would have saved me that Friday night :

Instead of:

Git revert - 2 minutes
Push to repo - 1 minute
Wait for CI/CD - 15-20 minutes
Pray it works - infinite anxiety

With FlagSwift :

Open dashboard
Click toggle
Feature disabled globally

Total time: 2 seconds.

No deployment. No waiting. No git history pollution.

Real-World Example:

How This Saves You:
Let's say you're shipping a new payment flow (just like I was):

Without Feature Flags:

// Old code
function Checkout() {
  return <OldPaymentFlow />
}

// Deploy new code - GOES LIVE IMMEDIATELY

function Checkout() {
  return <NewPaymentFlow />  // If this breaks, everyone sees it
}

If it breaks: 15-25 minute rollback via deployment.

With FlagSwift:

function Checkout() {
  const useNewPayment = useFlag('new-payment-flow')

  return useNewPayment ? <NewPaymentFlow /> : <OldPaymentFlow />
}

Deploy this code. Nothing changes for users yet.

Then:

Enable for yourself first (test in production with real data)
Enable for your QA team (5 people test it thoroughly)
Enable for 1% of users (50 people, monitor for issues)
Enable for 10% of users (500 people, looks good!)
Enable for everyone (full rollout)

If anything breaks at ANY step:
Click toggle. 2 seconds. Back to old flow.

What Makes FlagSwift Different
I've tried most feature flag tools.

Here's what I built differently:

** Zero Config**

No YAML files.
No environment variables (they're optional).
No complex setup.

One npm install, wrap your app, start using flags.

** It's Free to Start**

Unlimited flags
Unlimited environments
Unlimited team members

You only pay when you scale to high request volumes.

** User Targeting That Makes Sense**.
Want to test with specific users?

const client = new FlagClient({
  apiKey: 'your-key',
  userIdentifier: currentUser.email  // or user ID, whatever you want
})

Add their email to the dashboard. Done.

No complicated segment rules.
No user attribute schemas.
Just identifiers.

** Multi-Environment by Default**

// Development
const client = new FlagClient({ environment: 'development' })

// Staging  
const client = new FlagClient({ environment: 'staging' })

// Production
const client = new FlagClient({ environment: 'production' })

Test features locally while keeping them hidden in production.

Fast (Really Fast)

Your app checks flags instantly with zero network overhead per check.
Flags are fetched once on load and cached.
Dashboard changes propagate in ~2 seconds globally.

Current Status & What's Next

Right now, FlagSwift supports:

React (via @flagswift/react-client)
Node.js (via @flagswift/node-server)
Python (via pip install flagswift)

Coming soon:

Go SDK (for backend services)
Analytics dashboard (see which flags are actually used)
Slack notifications (get alerted when flags change)

Try It Yourself:

If you've ever been afraid to deploy on Friday, FlagSwift is for you.
FlagSwift

Free to start
30-second setup
No credit card required
Rollback any feature in 2 seconds

I built this to solve my own 3AM deployment panic. Hope it helps you avoid yours.

What's your worst deployment story?
Mine was breaking checkout on a Friday afternoon and losing 22 minutes of revenue.

I Built a Feature Flag Tool (Here's What I Learned)

Emmanuella A. — Wed, 15 Oct 2025 14:05:06 +0000

The Problem I Was Solving

As a developer, I was frustrated with existing feature flag tools. For small teams the costs were over the roof, and open-source solutions require self-hosting and complex setup.

I wanted something that:

Takes 30 seconds to set up (literally)
Costs $0 to start
Works with React and Node.js out of the box
Doesn't require reading 50 pages of documentation

So I built FlagSwift.

What Makes FlagSwift Different?

1. 30-Second Setup (Literally)

Most feature flag tools require config files, complex SDKs, and reading docs for hours.

FlagSwift is literally:

npm install @flagswift/react-client

import { FlagProvider, FlagClient, useFlag } from '@flagswift/react-client'

const client = new FlagClient({
  apiKey: process.env.NEXT_PUBLIC_FLAGSWIFT_API_KEY,
  environment: 'production'
})

function App() {
  return (
    <FlagProvider client={client}>
      <YourApp />
    </FlagProvider>
  )
}

function Feature() {
  const enabled = useFlag('my-new-feature')
  return enabled ? <NewUI /> : <OldUI />
}

That's it. Feature flags working in production or any environment you set it to.

2. 2-Second Rollbacks (No Deployment)

When something breaks at 3 AM, you don't want to:

Revert git commits
Wait for CI/CD (10-15 minutes)
Hope the deployment doesn't fail

With FlagSwift:

Open dashboard
Click toggle
Feature disabled globally immediately

No deployment. No waiting. Just instant control.

3. User Targeting That Actually Makes Sense

Want to enable a feature for specific users?

// Client-side
const client = new FlagClient({
  apiKey: 'your-key',
  userIdentifier: currentUser.email
})

// Server-side
const enabled = client.isEnabled('beta-feature', {
  identifier: req.user.email
})

Add the email to your target list in the dashboard. Done.

No complicated segment rules. No user attribute schemas. Just email addresses or whatever you want to track your specific user.

Mistakes I Made Building This

1. Setup Time Is Everything

The #1 question was: "How long does setup take?"

If the answer is more than 5 minutes, developers, teams or orgs won't even try it.

I obsessed over this:

No config files
No environment variables required (optional)
Works out of the box with Next.js, Vite, CRA

Result: FlagSwift's setup became our biggest advantage.

Lesson: Developer tools live or die on time-to-first-value.

2. Pricing Kills Adoption

I made FlagSwift free to start:

Unlimited flags
Unlimited environments

You only pay when you scale to high request volumes.

Result: 10x more signups vs. my initial paid-only model.

Lesson: For developer tools, free tier = trust. Let people try before they buy.

Why FlagSwift Won't Slow Down Your App

Fast by Design

Dashboard changes propagate in ~2 seconds globally
No CDN delays, no cache invalidation issues
Environment isolation built-in

Client Performance

Your app checks flags instantly with zero network overhead per check. Flags are fetched once on load and cached.

Server Performance

Aggressive caching means your server makes ~99% fewer API calls while staying up-to-date.

The result? Your app stays fast even with 50+ feature flags running.

Current Status

React SDK: ✅ Live on npm
Node.js SDK: ✅ Live on npm
Dashboard: ✅ Live at flagswift.com
Pricing: Free to start, scales with usage

What's Next?

I'm actively building other SDK:

Python SDK (for Django/Flask apps)
Go SDK (for backend services)
Analytics dashboard (see which flags are actually used)
Slack notifications for flag changes

Try It Out

If you're tired of complex feature flag tools, give FlagSwift a shot:

🔗 https://flagswift.com

Free to start
30-second setup
Rollback any feature immediately

Questions? Feedback? Drop a comment!.

I Built a Simple Feature Flag Service Because I Was Tired of Being Afraid to Deploy

Emmanuella A. — Mon, 22 Sep 2025 20:36:46 +0000

*The Problem That Kept Me Up at Night
*
You know that feeling when you're about to deploy to production? That pit in your stomach wondering "what if this breaks everything?"
I was there every single time. Even for small features, I'd spend hours second-guessing myself. Sure, I could use other platforms, but for my projects and small apps, they felt like bringing a bazooka to a water balloon fight - powerful but overkill (and expensive).

So I Built FlagSwift
After one too many "please work" moments hitting the deploy button, I decided to build something simpler.

What it does:

✅ Simple dashboard to create and manage feature flags
✅ React client with a clean FlagProvider component
✅ Per-environment targeting (dev, staging, prod)
✅ Per-user targeting (gradually roll out to specific users)
✅ Team collaboration (invite your devs to test together)

What it doesn't do:

❌ Require a PhD to set up

Quick Example

import { FlagProvider, useFlag } from '@flagswift/react-client';

function App() {
  return (
    <FlagProvider apiKey="your-api-key" environment="production" userId="user123">
      <MyComponent />
    </FlagProvider>
  );
}

function MyComponent() {
  const isNewFeatureEnabled = useFlag('new-checkout-flow');

  return (
    <div>
      {isNewFeatureEnabled ? 
        <NewCheckoutFlow /> : 
        <OldCheckoutFlow />
      }
    </div>
  );
}`

Try It Out

Application: FlagSwift
Install: npm install @flagswift/react-client

It's free while in beta

What I'm Looking For:

Honest feedback from real developers:

Would you actually use this? (Please be brutal - I can handle it)
What am I missing? What features would make this a must-have?
What SDKs should I build next? Next.js? Node? Vue? Svelte?

Why I'm Sharing This?

Because I think every developer deserves to deploy without fear. And if this helps even one person sleep better after hitting deploy, it's worth it.

Also, I genuinely want to build something people actually want to use, not just something I think is cool. So please, tear it apart and tell me how to make it better.

Try it out and let me know what you think!