Open to opportunities

Shivam Singh

@shivamsingh19

Senior full-stack engineer building scalable, multi-tenant SaaS and AI/LLM integrations across distributed event-driven systems.

India

Message

What I'm looking for

I want to build production-grade, multi-tenant SaaS with strong AI/LLM and event-driven systems, in cross-functional agile teams where I can own end-to-end delivery, improve reliability, and mentor engineers.

I’m a Senior Full-Stack Engineer with 5+ years of experience designing, shipping, and scaling production-grade SaaS products across AI, ad-tech, healthcare, and IoT. I’m proficient across the full stack—React.js and Next.js on the frontend, and Node.js, NestJS, and TypeScript on the backend.

I focus on multi-tenant architecture, distributed systems, and event-driven pipelines, with deep expertise in serverless infrastructure and AI/LLM integrations. I’ve led technical delivery in cross-functional agile teams, mentoring junior engineers, conducting code reviews, and owning end-to-end feature development from system design to production deployment.

In my recent role, I reduced average API response time by 40% by refactoring N+1 queries, introducing Redis caching, and optimizing PostgreSQL indexes. I enabled zero-downtime multi-tenant deployments for 10+ organizations by implementing domain-based routing and per-tenant Clerk authentication to eliminate cross-tenant data leakage risks.

I also improved reliability and speed for AI experiences by building a unified streaming API layer via LiteLLM and Server-Sent Events (SSE). In parallel, I raised release confidence with 4,800+ Vitest and Jest tests enforced across a TypeScript monorepo using CI/CD gates.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Developer

Current

Zowork Private Limited

Nov 2023 - Present (2 years 8 months)

Optimized a Node.js backend and PostgreSQL for real-time dashboards, cutting average API response time by 40% and improving near-zero regression releases with extensive Vitest/Jest coverage and CI/CD gates. Delivered multi-tenant Next.js authentication and domain-based routing, built serverless ad rendering pipelines, and implemented an SSE streaming API for multi-model LLM reliability.

TypeScript Node PostgreSQL Redis Next.js Clerk Domain Based Routing AWS Lambda BullMQ LiteLLM Server Sent Events (SSE)Vitest Jest CI CD Event Driven Architecture

Software Developer

Antino Labs Private Limited

Mar 2022 - Jul 2023 (1 year 4 months)

Built an IoT monitoring platform with React dashboards and Node.js/Express microservices for 500+ smart streetlight assets, including real-time fault detection and automated alerts. Delivered secure B2B onboarding with JWT/RBAC and AWS SQS/SES notifications, and integrated Razorpay and Gupshup SMS to improve async payment and messaging reliability.

React Node Monitoring Fault Detection JWT SES MongoDB Razorpay Gupshup SMS

Web Developer

DigiVioTech

Sep 2018 - Feb 2022 (3 years 5 months)

Scoped, built, and launched 10+ production websites using WordPress, including custom themes/plugins and PayPal integration, owning delivery from requirements to go-live. Transitioned into full-stack development with Node.js/Express and MongoDB, shipping RESTful APIs and strengthening responsive frontend implementation for later React/Next.js work.

WordPress Responsive Design Asset Optimization Node REST APIs MongoDB