Javid

5. The Lambda layers improve cold start. No, it does not. It may improve your development/testing time, but the performance will not be better.

Be cautious with memory usage. For example, most of the time, 512 MB is preferable to 256 MB or 128 MB, which results in more CPU credits, faster execution, and potentially lower costs. Increasing memory alone will not always be the most cost-effective solution.

4. The Lambda function is only meant for small tasks. No. The lambda function can run for up to 15 minutes. The max function memory is 10GB. The memory is not just a number but a controller for the performance of a lambda function. When you increase the memory, it also increases the CPU credits.

And in every 10 seconds, Lambda will scale up to another 1000 instances. Note that the first instant 1000 instances are more than enough for most use cases.

3. The Lambda function scaling is instant. No. Lambda has a limit on how fast your functions can scale. Your instant execution environment instance is 1000.

2. The Lambda function scaling is infinite. No. Check your account limits. If you open a new account, you will get 10 concurrent executions by default. You need to request more concurrent executions.

Common Misconceptions about AWS Lambda

1. The Lambda function cold start is free. Soon, Not anymore. Effective August 1, 2025, cold start will be charged (surprised it took this long)

Most AI-powered apps:

> It's different from ChatGPT because it's specially trained on the X dataset

Meanwhile, in the backend

"You're an expert on X..."

Whether you use it or not, seriously stop pasting sensitive data into random websites.

Try it now:

selfdevkit.com

• HTML & Markdown Editor
• ID Generator & Analyzer
• Regex Validator
• URL Parser & DNS Lookup
• Dark & Light mode support
• And many more...

**Some** Features:
• JSON Tools (format, minify, validate)
• File Generator
• JWT Tools (decode, verify, create)
• Cronjob generator
• JSON to types (TypeScript, Go, Python, Rust, etc.)
• Secret Generators (API keys, key pairs)

- 50+ essential developer tools in one place
- Near-native speed (The functionality is written in Rust 🦀)
- Lightweight (under 40MB)
- Completely offline, secure, and privacy-focused
- No ads, no tracking, no data collection

The existing web solutions weren't really solving this issue. You never know where your sensitive data ends up, and those annoying ads keep popping up everywhere. Not to mention the browser tab chaos!

So, I built a desktop app that solves these pain points. Meet SelfDevKit

🚀 Excited to announce the launch of selfdevkit.com - Your All-in-One Developer Toolkit!

As a software engineer, I often need to verify/debug JWT tokens, decompress data, debug timestamps, or test various file formats. Sound familiar?

Just landed two big features. SelfMailKit.com is now a complete email dashboard!

1. Native Inbox - Send, receive, and reply to emails directly from the dashboard.

2. Managed version of SelfMailKit. If you don't prefer the self-hosted version, use the managed version with Inbox

selfmailkit.com Save up to 98% on Email Costs

Upon request, another big feature is launching this week (tomorrow?)

Managed SelfMailKit. Bring your SES, and let us handle everything

selfmailkit.com/managed/

not if you follow best practices

bsky.app/profile/javi...

the price difference is insane

thank you! Let me know if there’s any feature that you’d like to see :)

Issues · self-mail-kit/roadmap SelfMailKit public roadmap. Contribute to self-mail-kit/roadmap development by creating an account on GitHub.

This is just the beginning. Many more features are coming.

If you want to request a feature, please use this link

github.com/self-mail-ki...

#10. Of course, dark and light themes are also part of this launch

#9. Battle-tested, secure, scalable and cost-efficient.

It's designed to send from tens of emails to millions of emails. SelfMailKit follows best practices.

It's heavily optimized for cost, and sending millions of emails just costs a few dollars

#8. Smart warm-up

Let SelfMailKit automatically manage email sending for brand-new domains.

The sending number will gradually increase over the upcoming days until it's warmed up.

#7. Analytics

We all love analytics. SelfMailKit provides detailed metrics like open and click tracking, bounce reports, complaints, etc. More is also coming

#6. Team collaboration.

Invite team members with different roles. Create API keys, templates, and more with granular permissions.

#5. Unlimited domains

Add unlimited domains. Seriously. Manage all your projects in one dashboard

#4. Contact management

Import any size of contacts from CSV. It will validate and only upload valid contacts.

You can also use APIs to manage the contacts automatically

#3. Easily build email templates.

Enjoy a Notion-like editor meant for building email templates.

You can also use the code-based editor to import any existing template or use HTML/CSS to code your own editor.

#2. Transactional and Marketing Emails

Get real-time delivery stats and send automated transactional emails

Manage marketing campaigns, schedule newsletters, and track performance

Plus, auto-suppressing bounces and complaints will help keep your domain reputation strong/health

#1. Self-hosted (soon it will also support "bring your own key"). You truly own everything. Customize as you wish, and just pay $10$ to send 100,000 emails.

With one command, you deploy to your AWS account. No AWS knowledge is required. You don't even need to open your AWS acc