Blog
All articles. All pillars. All authors.
#120 -- RAG: Retrieval, Reranking, and Source Attribution
How FLIN implements Retrieval-Augmented Generation -- semantic retrieval from your data, cross-encoder reranking for precision, and source attribution so users know where answers come from.
Cron Jobs and Preview Environments: Two Features, Zero Downtime
How we built cron job scheduling with timeout enforcement and preview environments with PR webhook integration -- developed in parallel using git worktree isolation.
#119 -- FastEmbed Integration for Embeddings
How FLIN integrates FastEmbed for local embedding generation -- no API calls, no network latency, no data leaving the server. Privacy-first semantic search at 10ms per embedding.
#115 -- Custom Guards and Security Middleware
How FLIN developers create custom guards and security middleware for application-specific access control -- verified email guards, subscription checks, IP restrictions, and audit logging.
#124 -- AI-First Language Design
How FLIN was designed from the ground up for AI-assisted development -- minimal syntax for fewer tokens, self-contained files for complete context, and MCP integration for AI agent tooling.
#053 -- Time Arithmetic: Adding Days, Comparing Dates
How we implemented duration literals and time arithmetic in FLIN -- from the elegant N.days syntax to constant folding at compile time, delivering zero-cost abstractions for date operations.
Credits, FCFA, and 6 African Payment Gateways
USD-cent pricing, 13 currencies, Orange Money and M-Pesa, 3 payment gateways, webhook-driven confirmation, and a background poller. Monetizing an African SaaS.
#109 -- Rate Limiting and Security Headers
How FLIN provides built-in rate limiting with sliding windows and automatic security headers on every response -- protecting applications against abuse, XSS, clickjacking, and MIME sniffing by default.
#110 -- Two-Factor Authentication (TOTP)
How FLIN implements TOTP two-factor authentication as a built-in feature -- secret generation, QR codes, verification, and backup codes in four function calls.
#111 -- OAuth2 and Social Authentication
How FLIN provides built-in OAuth2 functions for Google, GitHub, Discord, Apple, LinkedIn, and Telegram -- PKCE flows, state validation, and user creation in a standardized pattern.
#112 -- WhatsApp OTP Authentication for Africa
How FLIN provides built-in WhatsApp OTP authentication -- the phone-first auth method designed for African markets where WhatsApp is the primary communication platform.
#106 -- Security by Design: OWASP Top 10 in the Language
How FLIN addresses all OWASP Top 10 vulnerabilities at the language level -- not through libraries, not through configuration, but through design decisions that make insecure code impossible to write.