Design systems that stay correct under load.

I'm Jatin Singh — 8+ years shipping Node.js / NestJS platforms for payments, multi-tenant CRM, and high-scale consumer backends.

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About

Tech lead energy.Architect discipline.

I design and lead backend systems where money, tenancy, and latency actually matter — NestJS/Node services, Kafka pipelines, polyglot persistence, and APIs that evolve without breaking clients.

Production craft over slide-deck architecture: clear contracts, observable systems, zero-drama deploys, and incident response that stays calm.

Years shipping

0K+

MAU served

0.0%

Uptime targets

<0ms

P95 critical paths

Selected work

Production systems, measured by outcomes.

Payments, multi-tenant platforms, marketplaces, and high-scale backends. Browse all case studies.

Large-scale super app supporting digital payments and multiple consumer services. Backend served 500K+ MAU with real-time location and notifications.

Impact — P95 API latency under 200ms at peak; 99.9% uptime; zero-downtime deployments and backward-compatible API evolution.

Designed and built Node.js backend services serving 500K+ monthly active users
Zero-downtime deployment strategy; rolled out releases with no service interruption for end users
Backward-compatible API and contract evolution; supported multiple client versions without breaking existing consumers
Event-driven workflows using Kafka; reduced notification delivery time by ~60% vs batch jobs
MongoDB for core application data; ScyllaDB for real-time user location and notification triggers at scale

Node.jsTypeScriptExpressKafkaMongoDBScyllaDBAWSAPI GatewayS3SNSSES

Full case study →

Stack

Tools for reliable throughput.

Runtime

Node.js
TypeScript
JavaScript

Frameworks

NestJS
Express
Hapi.js
Koa

Data

PostgreSQL
MongoDB
MySQL
ScyllaDB
Oracle

Streams

Kafka
Azure Event Hubs
RabbitMQ

Cloud

AWS
Azure
S3
API Gateway

Ops

Docker
CI/CD
Grafana
Argo
Jest

Contact

Building something that needs to hold under pressure?

Available for backend architecture, tech lead, freelance, and contract work.

Emailsingh.jatin321@gmail.com Phone+91 88608 08866

Download resume Hire / engage LinkedIn GitHub

Design systems that stay correct under load.

Tech lead energy.Architect discipline.

Production systems, measured by outcomes.

01TOKIFintechSuper AppMongolian Super App (Payments & Multi-Services)+

02Quivio CRM ServiceCRMSaaSMulti-Tenant CRM & Campaign PlatformCampaign delivery throughput 2x after pipeline and Redis optimizations; multi-tenant isolation with zero cross-tenant data leakage.+

03StyleBetterEcommerceMicroservicesMicroservices-Based Fashion PlatformP99 latency under 300ms across services; 3x faster catalog and search after Redis and query optimization.+

04Sadad-SabbFintechGovt IntegrationSADAD Bill Payment & MOI IntegrationZero payment discrepancies in production; 100% policy and limit enforcement; sub-second response for eligibility checks.+

05CS-Cart Marketplace Connectors & WalletEcommerceMarketplaceWebkul — Marketplace integration and addon developmentSync success rate 99%+ with retry and idempotency; wallet addon processed 50K+ transactions with zero balance drift.+

Tools for reliable throughput.

Building something that needs to hold under pressure?