Available for AI & backend roles

Building intelligent systems that solve real problems.

AI Systems & Backend Engineer specializing in production-grade agentic systems, real-time backends, and event-driven infrastructure.

4,000+
AI conversations / mo
1,000+
monthly active users
3
production platforms

About

I turn hard systems problems into reliable products.

AI Systems & Backend Engineer specializing in production agentic systems, multi-agent LLM orchestration, real-time workflows, and event-driven infrastructure. I've architected an AI financial advisory platform, a telephony + billing operations platform, and scalable backend services — owning architecture, observability, reliability, and deployment end to end.

My signature across every system: event-driven backends, strict multi-tenant and session isolation, governance and whitelist patterns, and observability baked in from day one. My deepest work is agentic LLM orchestration; my widest-surface work is a telephony + billing + attribution platform I built solo.

Agentic AI systems

Multi-agent orchestration with Google ADK + Gemini — coordinators, specialists, tool-calling, deterministic grounding, and full LLM observability.

Real-time & event-driven backends

Socket.IO call routing, webhook pipelines, Bull + Redis job systems, and infrastructure that stays correct under concurrency.

Billing & money-movement infra

Multi-tenant Stripe Connect billing, payouts, reconciliation, and server-trusted pricing engines built to be auditable.

End-to-end ownership

From architecture and data modeling to observability, reliability, and deployment — I ship and operate production systems.

Experience

Where I've shipped

Professional roles and engagements. (Personal projects live in the next section.)

  1. AI Systems Engineer · Sure Financial

    Architected a production AI financial advisory platform and the engagement infrastructure around it.

    Jan 2026 — Present

    Full-time
    • Architected a production AI financial advisory platform using Google ADK, Gemini, tool-calling, session memory, and real financial-data grounding.
    • Built a coordinator → specialist multi-agent system (routing, conversational advisor, tool/UI actions, and a loan-negotiation journey) with a parallel 'thinking' agent for fast perceived responses.
    • Eliminated async context leakage across concurrent user sessions using Python ContextVar isolation.
    • Designed structured LLM output schemas (version-gated by client build) enabling dynamic Flutter widget rendering on mobile.
    • Reduced hallucinations via deterministic data grounding — compact context cards plus a post-response check that verifies any institution named actually exists in the user's accounts.
    • Implemented human-in-the-loop flows (ADK long-running tools) and real-time escalation webhooks for expert consultation.
    • Integrated Langfuse observability with per-agent cost attribution and routing-drift detection.
    • Built FastAPI services and orchestration infrastructure supporting 1,000+ monthly active users and 4,000+ AI conversations per month.
    • Built a dedicated Go (Gin/GORM) gateway microservice to MoEngage for user-profile and event sync, with an internal event-governance catalog enforcing a single, consistent event vocabulary.
    Google ADKGemini 2.5 Pro/FlashTool CallingLangfuseDeterministic RAGFastAPIPythonasyncioGoGinGORMPostgreSQLSQLAlchemyFirebase FirestoreCloud SQLGCP / Cloud RunMoEngage

  2. Lead Backend Engineer · inboundSelect (US client)

    Solely architected and built a production inbound-call operations platform — routing, billing, attribution, and marketplace workflows.

    2025

    Contract
    • Solely architected and built a multi-tenant inbound-call operations platform handling routing, billing, payouts, attribution, and marketplace workflows.
    • Engineered low-latency call routing using Twilio, Socket.IO, and an eligibility-based dispatch engine.
    • Developed multi-tenant billing and payout systems using Stripe Connect with financial isolation per agency.
    • Built event-driven webhook pipelines and Bull + Redis job systems for invoicing, reconciliation, and recovery workflows.
    • Built marketing-attribution backends integrating Twilio inbound webhooks with Google Ads to track live campaign ROI.
    • Established inbound/outbound support email infrastructure using AWS SES with suppression-list handling.
    • Designed real-time dashboards for attribution, call funnels, revenue analytics, and live operational tracking.
    Node.jsExpressSocket.IOTwilioStripe ConnectBullRedisPostgreSQLAWS SESGoogle Ads APIRailwayVercel

    Contract engagement. A deeper technical case study appears in Projects.

  3. Backend Engineer Intern · Exploria

    Built scalable REST backends and AWS-integrated workflows.

    Apr 2025 — Jun 2025

    Internship
    • Designed and implemented REST APIs using Node.js and Express.
    • Integrated AWS S3 and Lambda into scalable backend workflows.
    • Built API validation, testing, debugging, and documentation processes.
    Node.jsExpressRESTAWS S3AWS Lambda

Selected Work

Projects I've built end to end

Each is a real, production-grade system. Open one for the full case study — problem, architecture, and decisions.

2025 · In production

InboundSelect

Multi-tenant pay-per-call operations platform

Real-time inbound-call routing, multi-tenant Stripe Connect billing & payouts, marketplace resale, and Google-Ads attribution — built end to end.

Node.jsExpress 5Socket.IOTwilioStripe Connect

2025 · Live

Royal Algae

D2C e-commerce platform for premium sea-moss wellness

A complete D2C storefront — guest phone-OTP checkout, Razorpay payments, server-side pricing, invoicing, and an admin dashboard.

Laravel 12PHP 8.2SanctumSpatie PermissionRazorpay

2025–2026 · In production

BuildFlowCRM

Commercial real-estate CRM with maker-checker governance

A MERN CRM for commercial real estate — five asset classes modeled polymorphically, plus an approval workflow where every employee edit and delete is reviewed before it lands.

Node.jsExpressMongoose 8 (discriminators)JWT (httpOnly cookies)helmet

Toolkit

Skills & technologies

The stack I reach for across AI, backend, data, and cloud.

AI & Agent Systems

Google ADKGeminiMulti-Agent OrchestrationTool CallingRAGLangGraphLangfusePrompt Engineering

Backend & Systems

Node.jsExpressFastAPIGo (Gin)REST APIsWebSockets / Socket.IOBull QueuesEvent-Driven SystemsReal-Time InfrastructureJWT Auth

Languages

JavaScript / TypeScriptPythonGoPHPJavaSQL

Databases & Storage

PostgreSQLMongoDBRedisSupabaseFirebase

Cloud & Infra

AWS (S3, SES, Lambda)GCP / Cloud RunVercelRailwayGitHub ActionsCI/CDCloudflare

Integrations & Tooling

TwilioStripe ConnectRazorpayGoogle Ads APIGoogle Calendar APIMoEngagePostmanGit

Open Source

Published & shared

Tools I've released for other developers to use.

Mongoose–Zod Schema Builder

An npm package that bridges Mongoose and Zod so a single source defines both your database schema and runtime validation — eliminating drift between what the DB stores and what the API validates.

npmTypeScriptMongooseZod

Contact

Let's build something together.

Hiring, a contract build, or just want to talk systems? Drop a message — or ask my AI assistant first.

kumararnav028@gmail.com