Engineering
Our Tech Stack
A deep dive into the technologies that power SendZen's developer-first WhatsApp infrastructure.
By Milan MotavarSeptember 2025
The SendZen Blog
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Our story, mission, and team updates
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Latest features and roadmap insights
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Technical deep dives and architecture insights
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Security, compliance, and trust initiatives
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Developer hacks, tutorials, and lessons learned while solving real-world engineering problems.
Latest Posts
Engineering
Approach to Software Engineering
At SendZen, we balance speed, reliability, and compliance using YAGNI and DRY principles applied with pragmatism and judgment.
By Milan MotavarSeptember 2025
Trust & Compliance
Security and PII
When you connect your WhatsApp number, you are trusting us with sensitive data. We take that responsibility seriously. From day one, security and privacy have been part of our architecture decisions.
By Milan MotavarSeptember 2025
Engineering
High-Throughput Messaging
WhatsApp APIs are designed for real-time, one-to-one communication. Running large-scale campaigns introduces challenges: queues of thousands of messages, unpredictable spikes in traffic, strict delivery receipts, and webhook storms.
By Milan MotavarSeptember 2025
Company
Philosophy
We're building developer-first WhatsApp infrastructure. That means our product is not a bundle of features; it is the path a developer takes from curiosity to first success. This page is not a list of corporate values. It is how we choose, how we ship, and how we behave when no one is watching.
By Milan MotavarSeptember 2025
Company
Lean Way
At SendZen, how we build the company is as important as what we build. We are not a typical SaaS startup chasing headcount or vanity metrics. Our philosophy is rooted in being lean, staying radically transparent, and cultivating a culture that values ownership and speed.
By Milan MotavarSeptember 2025
Company
Speed Matters
Speed is not just a technical metric for us. It is a philosophy. From reducing developer friction to shipping features quickly, speed compounds trust. A slow product, a slow process, or a slow culture all erode confidence. But speed without quality is meaningless.
By Milan MotavarSeptember 2025
Trust & Compliance
Sub-Processors
At SendZen, we take security and compliance seriously. As part of being transparent with our customers, we maintain a list of the third-party providers that help us deliver, store, and monitor our services.
By Milan MotavarSeptember 2025
Trust & Compliance
GDPR
Compliance with GDPR covers data collection, storage, and processing practices. Users can request access, correction, or deletion of their data at any time.
By Milan MotavarSeptember 2025
Company
Product-Led Growth
At SendZen, we don't believe in forcing demos or sales calls. Developers don't want to be sold to - they want to try, test, and see value quickly. Our go-to-market strategy is Product-Led Growth (PLG).
By Milan MotavarSeptember 2025
Developer Tips
Host APIDog in a Subfolder on Vercel with Next.js
We use APIDog for our API documentation and wanted to host it under subfolder on our next.js website running on Vercel. When we searched for it on internet, we couldn't find anything. APIDog's docs cover Nginx and Caddy, but there was no working guide for Vercel/Next.js.
By Milan MotavarSeptember 2025