Jatin Singh
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Associate Tech Lead · 8+ years building scalable, production-grade backend systems
About Me
Backend Engineer with 8+ years of experience designing and building scalable, production-grade backend systems. Shipped backends serving 500K+ users, sub-200ms P95 latency, 99.9% uptime, and event pipelines processing 10K+ events/sec. Specialized in Node.js, NestJS, Express, Hapi.js, Koa, event-driven architectures, distributed systems, and multi-database persistence strategies.
Experienced in high-scale applications, payment workflows, multi-tenant systems, and cloud-native deployments. Delivered measurable impact: doubled campaign throughput, reduced DB load and sync-related tickets by 30–50%, and zero payment discrepancies in production. I focus on designing resilient systems, selecting the right databases for the workload, and writing clean, maintainable, testable code.
I care about designing resilient distributed systems, building event-driven and asynchronous workflows, and optimizing for performance and low latency. Ensuring zero-downtime in production and clear APIs—REST and gRPC—is part of how I work.
I have strong debugging and production-troubleshooting skills and a solid understanding of backend scalability challenges. I use Grafana for logs and dashboards and Argo for review workflows. I'm comfortable working with DevOps and cross-functional teams and enjoy turning complex requirements into reliable, well-documented systems.
Domains I've shipped in
Core Expertise
What I specialize in when designing and building backend systems
Node.js / TypeScript
Backend development with type-safe, maintainable code.
NestJS, Express, Hapi, Koa
Structured backends with NestJS; lightweight APIs with Express, Hapi.js, and Koa.
Event-Driven Systems
Kafka, Azure Event Hubs, RabbitMQ for async workflows.
Distributed Systems
Scalability, consistency, and fault tolerance.
Multi-Tenant Architectures
Isolation, dynamic config, and tenant-aware data.
REST & gRPC APIs
Design and implementation of internal and public APIs.
Data Persistence & Modeling
Schema design, migrations, and polyglot persistence.
Cloud (AWS / Azure)
Serverless, storage, messaging, and secrets management.
Performance & Reliability
Optimization, monitoring, and zero-downtime deployments.
Observability & Logging
Argo for review workflows; Grafana for logs, dashboards, and metrics.
Technology Stack
Tools and technologies I use to build scalable systems
Experience by Domain
Hands-on experience across payments, CRM, marketplaces, and super apps
Payments & Fintech
Bill payment, wallets, and government integrations (SADAD, MOI). Delivered zero payment discrepancies, sub-second eligibility checks, and 99.9% uptime on payment APIs.
CRM & Campaigns
Multi-tenant CRM with 50+ tenants, segmentation, and SMS/email pipelines. Doubled campaign throughput via pipeline and cache optimizations; reduced DB load ~30%.
Marketplaces & E‑commerce
Connectors and sync pipelines with 99%+ success rate; wallet addon with 50K+ transactions and zero balance drift. Enabled multi-channel sales for 100+ merchants.
Super Apps & High-Scale
Backends serving 500K+ MAU; real-time data with ScyllaDB and Kafka (10K+ events/sec). P95 latency under 200ms; 3x faster catalog/search after cache and query tuning.
Key Production Projects
High-scale systems across payments, CRM, marketplaces, and super apps
Education
Academic background
Bachelor of Technology (B.Tech) – Computer Science & Engineering
Teerthanker Mahaveer University, Moradabad, UP
2017
Intermediate (Science)
Udaya Public School, Faizabad, UP
2013
High School Diploma
K.T. Public School, Faizabad, UP
2011
Get in Touch
Open to backend & architecture opportunities
Reach me via email or phone below. I'll respond within 24–48 hours.