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Open to senior full-stack and backend roles

Vivek Kumar

Building scalable systems, cloud-native applications, and high-performance digital products.

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1.2M+

Events / Day

Redis Streams backbone I own

99.9%

Checkout Availability

multi-vendor commerce platform

-70%

p95 API Latency

queue-based re-architecture

20+

Systems Shipped

owned design → deploy → on-call

vivek@command-center: ~/prod

github.contribution_graph

last 6 months

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01 · projects

Featured Builds

Production systems with real constraints — select a card to inspect the problem, the architecture, and what it moved.

Multi Vendor E-Commerce Platform

~/projects/multi-vendor-ecommerce

role: Backend owner — designed services, data model, and order pipeline

Problem

Independent vendors needed a single storefront with isolated catalogs, split payments, and per-vendor fulfillment — without the operational overhead of running separate stores.

Solution

Built a multi-tenant commerce platform with vendor onboarding, role-based dashboards, commission-aware checkout, and order routing that fans out a single cart to multiple vendors.

Architecture

Next.js storefront → Node.js/Express API gateway → MongoDB (tenant-scoped collections) with Redis for sessions and hot product cache; order events fan out through a queue to vendor services.

Key decision

Tenant-scoped MongoDB collections over one-database-per-vendor: same isolation guarantees at this scale, one connection pool, one backup story. Revisit at 1k+ vendors.

Next.jsNode.jsExpressMongoDBRedisStripeDocker
vendors onboarded
40+
vendors onboarded
checkout availability
99.9%
checkout availability
p95 catalog reads
<300ms
p95 catalog reads

03 · experience

Engineering Timeline

Commit history of a career — from research internships to owning production commerce systems.

  1. 2023 — Present

    HEAD → main

    Full Stack SDE

    Bytive — multi-vendor commerce platform

    • Own catalog, order, and payment services for a marketplace with 40+ vendors — 99.9% checkout availability, <300ms p95 catalog reads.
    • Re-architected order and inventory flows from synchronous API calls onto Redis Streams + SQS: 1.2M+ events/day, zero events lost across deploys, p95 API latency down 70%.
    • Run the AWS footprint (EC2, SQS, S3, Lambda, CloudFront) and CI/CD; added queue-depth and consumer-lag dashboards with alerts, so stuck consumers page before customers notice.
    • Drive design reviews for service changes; wrote the team's runbooks for stream reprocessing and DLQ drains.

  2. 2022

    Full Stack Developer Intern

    Daulat Ram College, University of Delhi

    • Built and shipped full-stack features across React frontends and Node.js APIs, used daily by college staff.
    • Modeled institutional workflows in MongoDB and integrated them end to end.

  3. 2021

    Full Stack Developer Intern

    Cluster Innovation Centre, University of Delhi

    • Delivered web applications from design to deployment in a research-driven team.
    • Production fundamentals under review discipline: versioning, code review, iterative delivery.

05 · blog

Engineering Notes

Writing up the systems I build — published on Medium. Queues, caches, auth, and the failure modes between them.

Distributed Systems

Designing Scalable Microservices in Node.js

A practical guide to service boundaries, contracts, and observability — designing Node.js microservices for a multi-vendor commerce platform.

4 min readNov 2025
All posts on Medium

06 · contact

Open a Connection

Hiring for a senior full-stack or backend role? Building something that needs to scale? Let's talk.

$ ssh vivek@available

Let's build something that stays up.

Open to senior full-stack and backend roles. Fastest response over email — typically within 24 hours.

India · Remote-friendly

vivekumar2003bsr@gmail.comResume