Viprasol Blog
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Articles (1514)
☁️Cloud & DevOpsGraph Queries in PostgreSQL: Recursive Traversal, Shortest Path
Implement graph queries in PostgreSQL without a dedicated graph database. Covers WITH RECURSIVE for tree and graph traversal, shortest path with BFS, cycle detection, social graph queries, and performance patterns.
☁️Cloud & DevOpsAWS Cognito Authentication: User Pools, JWT Verification
Implement AWS Cognito authentication in your app. Covers User Pool setup with Terraform, JWT verification in Node.js, hosted UI, Google and GitHub OAuth federation, custom attributes, and MFA.
🌐Web DevelopmentNext.js Multi-Tenant Subdomains 2026: Middleware + Code
Build SaaS multi-tenant subdomains in Next.js: middleware subdomain routing, per-tenant DB config, dynamic theming and wildcard domains - with working code.
🚀SaaS & StartupsSaaS Multi-Currency Pricing: FX Rates, Stripe Multi-Currency
Implement multi-currency pricing in your SaaS. Covers storing prices in multiple currencies, Stripe multi-currency charges, live FX rate caching, display vs charge currency separation, and tax-inclusive pricing.
🚀SaaS & StartupsSaaS Onboarding Flow: Progress Tracking, Guided Setup
Build a SaaS onboarding flow that activates users. Covers checklist design, progress tracking with PostgreSQL, contextual guidance tooltips, activation event detection, and onboarding analytics.
💰FintechReact Native Payments 2026: Stripe SDK, Apple Pay, Google Pay Guide
Integrate Stripe payments in React Native with Apple Pay and Google Pay. Covers @stripe/stripe-react-native setup, PaymentSheet, card forms, wallet payments, and subscription billing on mobile.
☁️Cloud & DevOpsEvent Sourcing in PostgreSQL 2026: Log + Projections
Implement event sourcing in PostgreSQL: append-only event store, aggregate rebuilds, projections and snapshots - production-ready SQL and patterns.
🌐Web DevelopmentNext.js Draft Mode: CMS Previews, ISR Invalidation
Implement Next.js Draft Mode for CMS content previews. Covers enabling draft mode via API route, bypassing ISR cache, Contentful and Sanity preview integration, and secure preview URL generation.
🤖AI & Machine LearningSaaS AI Assistant: Streaming Chat, Tool Calls
Build a production SaaS AI assistant with Claude claude-sonnet-4-6. Covers streaming responses with the Vercel AI SDK, tool calls for data access, conversation history with PostgreSQL, and context injection.
🌐Web DevelopmentReact Native Maps: Custom Markers, Clustering
Build production React Native map features with react-native-maps. Covers custom markers, marker clustering with supercluster, polyline directions, region tracking, and Google Maps vs Apple Maps configuration.
☁️Cloud & DevOpsPostgreSQL CTEs and Recursive Queries: Tree Traversal
Master PostgreSQL Common Table Expressions (CTEs) and recursive queries. Covers WITH clauses, recursive tree traversal, organizational charts, bill of materials, path enumeration, and query optimization.
☁️Cloud & DevOpsAWS OpenSearch Analytics: Index Mappings, Aggregations, and Dashboards
Build analytics pipelines with AWS OpenSearch Service. Covers cluster setup with Terraform, index mapping design, aggregation queries for metrics, real-time log ingestion, and OpenSearch Dashboards.
🚀SaaS & StartupsSaaS In-App Notification Center: Real-Time SSE, Read/Unread State
Build a production SaaS in-app notification center with Server-Sent Events for real-time delivery, read/unread tracking, notification types, user preferences, and a React notification bell component.
🌐Web DevelopmentReact Native Offline-First Apps: Complete Guide with WatermelonDB
Build React Native apps that work without internet. WatermelonDB setup, sync queues, conflict resolution, network detection, and background sync — with full working code.
☁️Cloud & DevOpsPostgreSQL Performance Tuning: EXPLAIN ANALYZE, Index Types, Vacuum
Deep-dive PostgreSQL performance tuning guide. Read EXPLAIN ANALYZE output, choose the right index type (B-tree, GIN, BRIN, partial), configure autovacuum, and use pg_stat views to find bottlenecks.
🤖AI & Machine LearningAWS SageMaker Real-Time Inference: Endpoints, Autoscaling
Deploy machine learning models with AWS SageMaker real-time endpoints. Covers model packaging, endpoint configuration, autoscaling policies, multi-model endpoints, and inference pipelines with Terraform.
🚀SaaS & StartupsSaaS Team Billing: Per-Seat Pricing, Prorated Seat Changes
Build per-seat SaaS billing with Stripe. Covers seat quantity updates with proration, mid-cycle additions, seat limit enforcement, team billing portal, and invoice management for team plans.
🌐Web DevelopmentNext.js Server Actions and Forms: useActionState, Optimistic UI
Complete guide to Next.js Server Actions for form handling. Covers useActionState, progressive enhancement, optimistic updates with useOptimistic, file uploads to S3, and validation with Zod.
🚀SaaS & StartupsSaaS API Rate Limiting: Token Bucket, Sliding Window, Per-Plan Limits
Build production API rate limiting for SaaS with token bucket and sliding window algorithms, per-plan tier limits, Redis atomic Lua scripts, and Stripe-style rate limit response headers.
🌐Web DevelopmentNext.js Error Monitoring in 2026: Sentry Integration
Set up production error monitoring for Next.js: Sentry SDK integration, App Router error boundaries, source map upload, performance tracing, custom context, and alert configuration.
☁️Cloud & DevOpsPostgreSQL Backup and Restore in 2026: pg_dump, WAL Archiving, PITR
Production PostgreSQL backup strategy: pg_dump for logical backups, WAL archiving with pgBackRest, point-in-time recovery, RDS automated backups, and restore testing automation.
☁️Cloud & DevOpsAWS CloudTrail Audit Logging: Setup, Athena Queries
Complete guide to AWS CloudTrail for security auditing. Set up multi-region trails, query logs with Athena, detect sensitive API calls like root login and IAM changes, and alert via SNS.
☁️Cloud & DevOpsAWS VPC Design in 2026: Subnets, NAT Gateway
Design a production AWS VPC: public/private subnets across AZs, NAT Gateway, security group rules, VPC endpoints for S3 and DynamoDB, and complete Terraform configuration.
🌐Web DevelopmentReact Native Gesture Handler: Swipe-to-Delete, Drag Handles
Master React Native Gesture Handler v2 with Reanimated 3. Build swipe-to-delete list items, draggable reorder handles, and pinch-to-zoom image viewers with production-ready TypeScript code.
🚀SaaS & StartupsSaaS Cron Job Dashboard 2026: Job History, Retry UI, Status Monitoring
Build a SaaS admin dashboard for scheduled jobs: job execution history, real-time status, manual retry, failure alerting, and duration tracking with PostgreSQL and React.
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