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!

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