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Randhir Kumar
Randhir Kumar

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From AI/ML Engineer to Solo SaaS Founder: Building TailorMails.dev

🚀 From AI/ML Engineer to Solo SaaS Founder: Building TailorMails.dev

Hi, I’m Randhir Kumar — an AI/ML engineer turned solo founder.

This is the story of how I built my first SaaS product, TailorMails.dev, from scratch, why I decided to build it in public, and what’s coming next as we prepare to launch on Product Hunt.

❌ The Problem: Cold Emails That Don’t Work

Cold emailing has always been a pain point for me. Whether it’s job hunting, reaching out to potential collaborators, or trying to generate leads, the success rate is painfully low.

Why most cold emails fail?

  • They sound robotic
  • Personalization is missing
  • Following up consistently is hard

As an engineer, I thought: “Why not use AI to solve this?”

💡 The Idea: TailorMails.dev

I wanted to create a tool that makes cold emails less cold.

TailorMails helps you:

  • Turn a LinkedIn bio into a personalized, reply-worthy email
  • Generate multiple subject line variations for A/B testing
  • Automate follow-ups while keeping a human tone
  • Use a lightweight CRM to track prospects from new → converted

👉 That became TailorMails.dev.

🛠️ The Build Journey (In Public)

I decided to build this product in public on X (Twitter).

I share openly about:

  • The tech stack I used (React, Firebase, OpenAI API)
  • The mistakes I made
  • The small wins, like the first sign-up

This way, I could stay accountable, get feedback early, and connect with other builders.

⚡ Challenges as a Solo Founder

Building your first SaaS product solo isn’t easy.

Some challenges I faced:

  • Balancing engineering with design + marketing
  • Avoiding feature creep and staying focused
  • Overcoming self-doubt (“Will anyone actually use this?”)

But every challenge taught me something valuable.

🚀 Why Product Hunt?

Launching on Product Hunt feels like the next big step.

It’s not just about getting upvotes — it’s about putting TailorMails in front of early adopters, founders, and sales pros who care about productivity and personalization.

I want to learn from their feedback and make the product better.

🔮 What’s Next?

Upcoming features for TailorMails:

  • Advanced analytics to predict the best email sending times
  • Integrations with Gmail, Outlook, and HubSpot
  • Scaling infrastructure as users grow

And of course, continuing to share the journey in public.

🎯 Final Thoughts

This is my first SaaS product, built by a solo founder who just wanted to solve his own problem.

If you’ve ever sent cold emails that didn’t get replies, I’d love for you to try 👉 TailorMails.dev.

And if you’re building your own project, don’t be afraid to share the process openly.

Building in public might just be your best marketing tool.

✍️ About Me

I’m Randhir Kumar — AI/ML Engineer • Solo Founder of TailorMails.dev

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