Building a Micro SaaS for Email Follow-Ups: My Journey from Idea to Launch

The Problem That Started It All

As a student juggling multiple projects and freelance work, I kept running into the same problem - I was losing track of follow-ups with potential clients. Emails would go unanswered, prospects would fall through the cracks, and I had no centralized way to know who I needed to follow up with.

I tried existing CRM tools but they were either too expensive, too complex, or required me to change my entire workflow. As a solo freelancer, I needed something lightweight that just worked.

So I decided to build it myself.

The Solution: NexusLead

NexusLead is a Micro SaaS I built specifically for freelancers and solo entrepreneurs who need a simple way to manage their email follow-ups without the overhead of enterprise tools.

Tech Stack

Here's what I used to build it:

• Frontend: React for a responsive, component-based UI
• Backend: Node.js with Express for the API layer
• Database: MongoDB for flexible document storage
• Email: Nodemailer with custom SMTP configuration
• Hosting: AWS for reliable deployment
• Authentication: JWT-based auth for secure user sessions

The Biggest Challenges

1. Email Deliverability

Getting emails into the inbox rather than spam was by far the hardest technical challenge. I spent days learning about:

• SPF records to authorize my sending domain
• DKIM signatures for email authentication
• DMARC policies for domain-level protection

Without proper configuration, even well-written follow-up emails were landing in spam folders. This is something every developer building an email-focused SaaS needs to prioritize from day one.

2. The Cold Start Problem

Building the product was actually the easy part. Getting those first users was incredibly hard. I spent weeks:

• Posting on relevant communities
• Reaching out to potential users individually
• Iterating on the product based on early feedback

The lesson: start building your audience before you even finish the product.

3. Feature Creep

My first version had way too many features. I kept thinking "what if users need this?" and adding things that nobody asked for. I learned to ship with the bare minimum and iterate based on actual user feedback.

What I Learned

1. Start small and validate fast - Don't spend months building. Ship something and get feedback.
2. Email infrastructure is harder than you think - Deliverability is a whole discipline on its own.
3. Community matters - The r/micro_saas and dev.to communities have been incredibly supportive.
4. Build in public - Sharing your journey attracts users who resonate with your story.

Current Status

NexusLead is now live and I'm actively working on getting my first paying users. If you're a freelancer struggling with email follow-ups, I'd love for you to check it out at nexuslead.live.

I'm also always open to feedback and collaboration. Feel free to reach out in the comments!

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What challenges have you faced when building your own SaaS? I'd love to hear your stories in the comments.