Push GitHub Leads to MailerLite — Signal-Driven Email Sequences for Developer Tools

Why MailerLite for GitHub Developer Leads

MailerLite is a developer-friendly email marketing platform with a clean API, competitive pricing, and a solid automation builder. If your team already uses MailerLite for newsletters and nurture sequences, adding GitHub signal-based triggers lets you reach developers at the exact moment they show buying intent — not weeks later when a retargeting ad catches them.

GitLeads captures two types of GitHub signals: (1) stargazer signals — developers who star your tracked repositories or competitor repos, and (2) keyword signals — mentions of your product name, competitor names, or problem-space keywords in GitHub issues, pull requests, discussions, or code. Each signal generates an enriched lead profile pushed to MailerLite via webhook.

Setting Up the GitLeads → MailerLite Webhook

GitLeads delivers leads via webhook payloads. Route these to MailerLite using a lightweight Next.js API route or serverless function that calls the MailerLite Subscribers API.

// pages/api/gitleads-to-mailerlite.ts
import type { NextApiRequest, NextApiResponse } from 'next';

const MAILERLITE_API_KEY = process.env.MAILERLITE_API_KEY!;
const MAILERLITE_GROUP_ID = process.env.MAILERLITE_GROUP_ID!;

interface GitLeadsPayload {
  event: string;
  lead: {
    github_username: string;
    name: string | null;
    email: string | null;
    company: string | null;
    location: string | null;
    followers: number;
    top_languages: string[];
    signal_type: 'stargazer' | 'keyword';
    signal_context: string;
  };
}

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== 'POST') return res.status(405).end();

  const { lead } = req.body as GitLeadsPayload;
  if (!lead.email) {
    return res.status(200).json({ skipped: true, reason: 'no email' });
  }

  const subscriber = {
    email: lead.email,
    fields: {
      name: lead.name ?? lead.github_username,
      company: lead.company ?? '',
      city: lead.location ?? '',
      github_username: lead.github_username,
      top_language: lead.top_languages[0] ?? '',
      signal_type: lead.signal_type,
      signal_context: lead.signal_context.slice(0, 200),
    },
    groups: [MAILERLITE_GROUP_ID],
    status: 'active',
  };

  const response = await fetch(
    'https://connect.mailerlite.com/api/subscribers',
    {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Bearer ${MAILERLITE_API_KEY}`,
      },
      body: JSON.stringify(subscriber),
    }
  );

  if (!response.ok) {
    return res.status(500).json({ error: await response.text() });
  }

  const data = await response.json();
  return res.status(200).json({ subscriberId: data.data.id });
}

Segmenting by Signal Type in MailerLite

The signal_type and signal_context fields let you route leads into separate MailerLite groups and trigger different automation sequences. Stargazer leads bookmarked a repo deliberately. Keyword leads stated a specific pain point in their own words.

• Stargazer group: 3-email sequence — repo value, docs/getting started, free trial CTA
• Keyword group: lead with the specific context they mentioned, offer a relevant resource
• Competitor stargazer group: position against that specific tool
• Language-filtered groups: personalize with top_language for language-specific messaging

Using MailerLite Automations with GitHub Signal Data

Once subscribers land in MailerLite with custom fields populated, the automation builder can branch sequences based on field values — trigger a different welcome email if top_language equals "Python" vs "TypeScript", or reference the repository they starred in the subject line.

// Route subscriber to a signal-specific group
async function addToSignalGroup(
  subscriberId: string,
  signalType: string,
  groupIds: Record<string, string>
) {
  const groupId = groupIds[signalType] ?? groupIds.default;
  await fetch(
    `https://connect.mailerlite.com/api/subscribers/${subscriberId}/groups/${groupId}`,
    {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${process.env.MAILERLITE_API_KEY}`,
        'Content-Type': 'application/json',
      },
    }
  );
}

MailerLite vs. Other Email Platforms for GitHub Leads

MailerLite is a strong choice for early-stage developer tool companies that need solid automation at a low price point. Compared to ConvertKit (creator-focused, limited custom fields) and ActiveCampaign (powerful but complex), MailerLite hits a practical middle ground. For transactional + marketing in one platform, Customer.io or Postmark are worth considering. GitLeads supports all of them.