0%
HomeServicesBackend Systems & API Development

Backend Systems & API Development

I build secure, scalable, and production-ready backend systems that power modern web applications. From designing robust APIs and database architectures to authentication, AI workflows, payments, and third-party integrations, I create backends built for reliability, performance, and long-term growth.

Real-World Expertise

  • Architected the complete backend for WidgIq, powering AI chat workflows, embeddable widgets, user management, analytics, and production-ready APIs within a scalable SaaS platform.
  • Engineered a production-grade RAG pipeline with concurrent crawling, domain filtering, pgvector-powered semantic search, and asynchronous background processing using Inngest.
  • Built secure backend services across multiple projects, implementing authentication, authorization, webhook verification, API protection, Redis-based rate limiting, and origin validation for production environments.
  • Integrated third-party services including Dodo Payments, AI providers, file uploads, and cloud infrastructure, enabling automated payment synchronization, AI processing, and seamless backend workflows.
  • Designed scalable database architectures and type-safe APIs for WidgIq, BeBetter.ai, GroundUp Pulse, and NexFlow, ensuring reliable communication between frontend, backend, and external services.

Tech Stack

Node.jsNext.js API RoutestRPCTypeScriptPostgreSQLDrizzle ORMPrisma ORMBetter AuthKinde AuthRedis (Upstash)InngestpgvectorSocket.IODockerGoogle CloudCloudflare Workers

What You Get

Scalable Backend ArchitectureSecure APIs & AuthenticationSeamless Third-Party Integrations for payments and DatabasesReliable & Production-Ready InfrastructureHigh-Performance APIs

Featured Projects

WidgIq

Built an embeddable AI chatbot platform that integrates into any website with a single <script> tag. It delivers context-aware support using website content, with conversation history, request analytics, and AI-powered weekly insights.

Next.jsBetter AuthRAG PipelineTypeScripttRPCReactTailwind CSSPreactpgvectorInngestDrizzle ORMPorkbunDodo PaymentsRedisUpstash
BeBetter.ai

BeBetter.ai is an AI-powered career platform that offers AI mock interviews, resume analysis, mock tests, personalized feedback, and job listings to help users prepare for and secure better career opportunities.

Next.jsBetter AuthTypeScripttRPCReactTailwind CSSNode.jsGemini APIUploadthingDrizzle ORMPolarImageKitInngestvercel

Got something you want built?

I'll build it properly, start to finish, a polished, production-ready product — and if my experience can improve the idea along the way, I'll speak up.

Related Services

Full-Stack Web Development

End-to-end products, from database to deployed UI.

AI Integration & LLM Features

Add AI that actually fits into your product, not bolted on.

Performance Optimization

Faster load times, smaller bundles, fewer wasted requests.

Frontend Development

Interfaces that are fast, accessible, and easy to update.

Maintenance & Support

Keep your product running without a full-time hire.

Cloud Deployment & DevOps

Get your app live, secure, and easy to redeploy.

© 2026 Gaurav. All rights reserved.