Cliff Jansen — Engineering Essays & Production Runbooks https://cliffjansen.com Technical essays, software ventures, and reproducible engineering runbooks covering fintech, M-Pesa rails, WhatsApp Cloud API, and multi-tenant architectures by Cliff Jansen, Founder & Software Engineer at Byte Nuru. en Sat, 19 Sep 2026 04:26:27 GMT Access Window Architecture: An Independently Revocable Context Boundary for API Protection https://cliffjansen.com/blog/access-window-architecture https://cliffjansen.com/blog/access-window-architecture Tue, 01 Sep 2026 00:00:00 GMT Security Architecture / API Protection Designing Resilient M-Pesa Webhooks Under Intermittent Connectivity https://cliffjansen.com/blog/resilient-mpesa-webhooks https://cliffjansen.com/blog/resilient-mpesa-webhooks Sun, 01 Feb 2026 00:00:00 GMT Fintech Rails Production-Grade Paystack Integration: Checkout, Webhooks & Idempotency https://cliffjansen.com/learning/paystack-integration-guide https://cliffjansen.com/learning/paystack-integration-guide Sun, 01 Feb 2026 00:00:00 GMT Fintech & Payments Automated CI/CD Pipeline: Docker, GitHub Actions & DigitalOcean https://cliffjansen.com/learning/docker-github-actions-digitalocean-cicd https://cliffjansen.com/learning/docker-github-actions-digitalocean-cicd Thu, 01 Jan 2026 00:00:00 GMT DevOps & Cloud Building Resilient WhatsApp Cloud API Webhook Ingestion https://cliffjansen.com/learning/whatsapp-cloud-api-webhook-resilience https://cliffjansen.com/learning/whatsapp-cloud-api-webhook-resilience Thu, 01 Jan 2026 00:00:00 GMT Messaging & APIs Zero-Downtime PostgreSQL Schema Migrations with Drizzle ORM https://cliffjansen.com/learning/safe-postgresql-migrations-drizzle https://cliffjansen.com/learning/safe-postgresql-migrations-drizzle Mon, 01 Dec 2025 00:00:00 GMT Database & Storage Why We Built BiasharaChats: The Reality of Conversational Commerce https://cliffjansen.com/blog/conversational-commerce-whatsapp-crm https://cliffjansen.com/blog/conversational-commerce-whatsapp-crm Sat, 01 Nov 2025 00:00:00 GMT Product Engineering Our Modern Multi-Tenant Stack: Next.js, Hono, and Drizzle https://cliffjansen.com/blog/multi-tenant-stack-nextjs-hono https://cliffjansen.com/blog/multi-tenant-stack-nextjs-hono Fri, 01 Aug 2025 00:00:00 GMT SaaS Architecture Offline-Tolerant Architecture for Multi-Branch Retail https://cliffjansen.com/blog/offline-tolerant-retail-erps https://cliffjansen.com/blog/offline-tolerant-retail-erps Thu, 01 May 2025 00:00:00 GMT Distributed Systems