Vansh.kumar
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Available for new opportunities

Vansh Kumar

>

I build scalable systems & delightful products.

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Years exp
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Projects
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Skills

// about

Crafting code with intention

Full-stack engineer with 5+ years crafting web applications, distributed systems, and developer tools. Currently exploring the intersection of AI and developer experience. Previously at early-stage startups where I wore many hats — from architecture to pixel-perfect UI.

⌘
Focus
Scalable distributed systems
▲
Motto
Engineer delightful products
⚡
Style
Developer experience first
∞
Always
Learning & shipping

// skills

Tools of the trade

TypeScriptGoRustPythonReactNext.jsTailwind CSSPostgreSQLRedisClickHouseKubernetesAWSTemporalOpenTelemetryGraphQLtRPC

Languages

04
TypeScriptGoRustPython

Frontend

03
ReactNext.jsTailwind CSS

Backend

03
PostgreSQLRedisClickHouse

Infrastructure

03
KubernetesAWSTemporal

Observability

01
OpenTelemetry

API

02
GraphQLtRPC

// experience

Where I've been, what I built

Senior Software Engineer

Mar 2023 — Present

@ Vercel

  • Led the Next.js App Router migration tooling used by 50k+ projects
  • Designed and shipped Turbopack incremental compilation for local dev
  • Maintained create-next-app and official templates (2M+ monthly downloads)

Software Engineer

Jun 2021 — Feb 2023

@ Linear

  • Built real-time sync engine powering collaborative issue tracking
  • Implemented keyboard-first command palette and navigation system
  • Designed plugin architecture for third-party integrations

Software Engineer

Jul 2019 — May 2021

@ Stripe

  • Worked on Radar ML fraud detection pipeline (50B+ events/day)
  • Built internal experimentation platform for A/B testing
  • Contributed to Stripe.js and React SDK packages

// projects

Things I've shipped

PressFlow

01

Publication workflow management system for editorial teams. Real-time collaboration, automated publishing pipelines, and version control for content.

Next.jsTypeScriptPostgreSQLTemporal
Live demo→Source→

DevKit CLI

02

Opinionated CLI for scaffolding production-ready Next.js projects with auth, database, testing, and deployment configured out of the box.

Node.jsTypeScriptInkVercel
Live demo→Source→

Telemetry

03

Lightweight observability stack for serverless functions. Structured logging, metrics, and distributed tracing without the bloat.

GoOpenTelemetryClickHouseGrafana
Source→

Component Gallery

04

Design system documentation site with interactive component playground, visual regression testing, and Figma sync.

ReactStorybookChromaticTailwind
Live demo→Source→

// writing

Thoughts in public

04

The Hidden Costs of Serverless at Scale

Dec 2022

Serverless promises infinite scale and zero ops. Reality is more nuanced. Cold starts, vendor lock-in, debugging distributed traces, and cost unpredictability at high throughput. After running Stripe's Radar on Lambda for 2 years, here's what I wish I knew...