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Senior Frontend Engineer

Jappreet Singh

Turning complex, data-heavy workflows into fast, intuitive interfaces.

  • 9+ years
  • Micro-frontends
  • Auth & rendering engines

About

Engineering interfaces that hold up over time.

I've spent 9+ years building frontends for insurance, e-commerce, utilities and cruise products — usually the data-heavy, workflow-heavy parts that need to feel simple.

I care about code the next engineer can work in: clear architecture, honest code reviews, and shared standards across the team.

Education
B.Tech, Computer Science

Selected work

Things I've built.

Underwriter Document Platform

A micro-frontend document platform that helps specialty insurance underwriters review submissions.

Processing time cut from hours to under 2.5 minutes, at 85–95% accuracy.

  • Vue.js
  • TypeScript
  • Micro-frontends

Keycloak Setup Wizard

A wizard that automates auth provisioning for single-page apps — realm, PKCE client, roles, SSO and branded login.

Provisioning cut from days to ~30 minutes.

  • Keycloak
  • OIDC
  • PKCE

High-volume Risk Map

An interactive Leaflet map for insurance risk data, built on marker clustering and canvas rendering.

Stays fluid with 250k+ markers across 4 map views.

  • Leaflet
  • Canvas
  • Vue.js

Micro-frontend Platform

A Module Federation platform with a JSON-schema rendering engine for multi-tenant insurance products.

Tenant customisation with zero deploys and zero UI code changes.

  • Module Federation
  • Vite
  • JSON Schema

Experience

Where I've done the work.

  1. Sep 2023 — Sep 2026

    Concirrus

    Principal Web Development Engineer

    Led frontend architecture for specialty insurance platforms — document processing, Political Violence & Terrorism, and Marine & Aviation risk.

    • Architected end-to-end authentication on Keycloak, with SSO and role-based access control across user roles and routes.
    • Built the document platform, Keycloak wizard, risk map and micro-frontend platform featured in Selected work.
  2. Aug 2021 — Sep 2023

    CoreValue Technologies

    Senior Frontend Engineer

    Led frontend on Prodport, an e-commerce personalisation platform — built its audience-targeting engine and cut API payloads by ~40% with a GraphQL migration.

  3. Sep 2020 — Aug 2021

    Smart Energy Water

    Product Engineer

    Built self-service portal features for utility customers, including stateless JWT auth and three production modules in a single quarter.

  4. Mar 2019 — Mar 2020

    Studio Graphene

    Software Engineer

    Delivered frontend for two startup products — HiNanny's onboarding and dashboards, and GoLearn's teacher portal.

  5. Feb 2017 — Mar 2019

    DeCurtis Corporation

    Associate Software Engineer

    Built search, filtering and the multi-step booking flow for Virgin Voyages, a cruise booking platform for the US and UK.

Stack

Stack & tools.

  • TypeScript
  • JavaScript (ES6+)
  • React.js
  • Next.js
  • Vue.js
  • Redux
  • Redux Saga
  • Vuex
  • React Query
  • HTML5
  • CSS3
  • Sass/SCSS
  • Tailwind CSS
  • Micro-frontends
  • Module Federation
  • JSON-schema rendering
  • GraphQL
  • REST APIs
  • Keycloak (SSO/RBAC)
  • JWT
  • OAuth 2.0
  • Vite
  • Webpack
  • Git
  • GitHub
  • Cursor
  • Google Antigravity

Frontend

  • TypeScript
  • JavaScript (ES6+)
  • React.js
  • Next.js
  • Vue.js
  • Redux
  • Redux Saga
  • Vuex
  • React Query
  • HTML5
  • CSS3
  • Sass/SCSS
  • Tailwind CSS

Architecture & auth

  • Micro-frontends
  • Module Federation
  • JSON-schema rendering
  • GraphQL
  • REST APIs
  • Keycloak (SSO/RBAC)
  • JWT
  • OAuth 2.0

Tools

  • Vite
  • Webpack
  • Git
  • GitHub
  • Cursor
  • Google Antigravity

Contact

Building something that needs a strong frontend? Let's talk.

Open to senior and principal frontend roles, and conversations about frontend architecture and AI-powered products.

Email me