Full-Stack Engineer · SDE II @ Traya Health
v26

VivekKumar

I build things that scale. Reliable backend systems, thoughtful products, and experiences that solve real problems.

Explore my work GitHub
01 SELECTED WORK
A few things I've built ↘
NextLink
01 / PRODUCT

NextLink

A link management platform to shorten, organize and track links with analytics, custom expiration rules, and edge redirects.

Next.jsBun.jsMongoDBPrismaTypeScript
Edge CachedP50 < 10msVercel EdgeJUL 2025 — PRESENT
02 / PRODUCT

SettleUp

A group expense-sharing and debt-simplification platform featuring an immutable double-entry ledger, graph minimization algorithms, and direct UPI settlements.

Next.jsPrismaMongoDBNextAuthTailwindCSSTypeScript
Graph SimplifiedDouble-Entry LedgerRazorpay / UPIOCT 2025 — PRESENT
RenderPDF
03 / DEVELOPER TOOL

RenderPDF

An API to render HTML into PDFs, with support for templates, headers, footers and custom styling.

Next.jsNode.jsPuppeteerTypeScriptTailwindCSS
Worker PoolRender < 250msVercel CloudFEB 2026 — PRESENT
04 / ENGINEERING

Recommendations

Multi-tenant recommendation infrastructure powering personalized product experiences across mobile apps and web.

NestJSNode.jsExpress.jsRedisPostgreSQL
02 THE JOURNEY · EXPERIENCE
Building, learning, improving

Traya Health Bengaluru, Karnataka

Software Development Engineer II · Recommendations Platform · APR 2026 — PRESENT

  • Own and scale the core recommendations microservice in Node.js, Express.js, and NestJS, powering personalized healthcare experiences across mobile app, web, and Shopify.
  • Improve database query performance, asynchronous workflows, and service resource utilization to maintain sub-100ms response times.
  • Work across API design, CMS integration, observability, and production reliability under high concurrency.

Software Development Engineer I · Full-stack Development · JUN 2025 — APR 2026

  • Architected a rules engine, intelligent Redis caching layer, and payload optimization, reducing result page response latency from ~500ms to < 100ms.
  • Engineered the diagnostic recommendation pipeline processing user input data to automatically generate personalized treatment plans.
  • Built responsive NestJS admin services and database schemas with robust input validation and audit logging.
Node.jsNestJSExpress.jsPostgreSQLRedisMicroservicesREST APIs
JUN 2025 — PRESENT

PayBolt Technologies Bengaluru, Karnataka

Software Development Engineer I · Payment Microservices · JUL 2024 — JUN 2025

  • Architected high-throughput payment microservices for core checkout workflows, including UPI, QR payments, payment links, and connected banking.
  • Designed PostgreSQL transaction persistence layers with ACID guarantees, collaborating with DevOps for high availability on AWS.
  • Built merchant reconciliation dashboards and real-time transaction monitoring tools in Next.js/TypeScript.
PostgreSQLAWSPayment APIsNext.jsTypeScriptACID
JUL 2024 — JUN 2025

Webelight Solutions Ahmedabad, Gujarat

Jr. React.js Developer · Frontend Systems · SEP 2023 — JUL 2024

  • Shipped 3+ production web applications using Next.js, React Hooks, SASS, and Webpack, mentoring 3 junior developers.
  • Established reusable component libraries, Sentry error monitoring, and Git workflow standards.
  • Optimized client-side rendering performance, state management, and asset delivery.
ReactNext.jsTypeScriptSASSWebpackSentry
SEP 2023 — JUL 2024
03 A bit about me
Engineer by craft. Curious by nature.
Vivek Kumar · Software Engineer

I enjoy turning complex problems into simple, reliable systems.

I start from the backend: NestJS microservices, service boundaries, and the AWS infrastructure (EC2, RDS, Nginx, CI/CD) that keeps them running, then build the React/Next.js interfaces on top.

I tend to own the parts of a system where correctness matters: payment reconciliation, recommendation ranking, and SSO — the details where a bug has real consequences. I enjoy understanding database query plans, distributed systems, clear abstractions, pragmatic engineering, and software that holds up in production.

More about my work
Let's
talk.
05 At a glance
How I approach engineering
3+ yearsBuilding and shipping software
Backend firstAPIs, data and distributed systems
Full-stackFrom product UI to infrastructure
ProductionOwnership beyond the code
06 Toolkit
Tools I use to make things work

Backend & Data

NestJS · Node.js · Express.js · Python · Go · REST APIs · Microservices · PostgreSQL · MongoDB · Redis

Frontend

React · Next.js · TypeScript · TailwindCSS · Redux Toolkit · React Query

Cloud & DevOps

AWS (EC2, RDS, Route 53, S3, CloudFront) · Docker · Nginx · Git · CI/CD · Sentry

07 Education
Learning is ongoing

Indira Gandhi National Open University

Master of Computer Applications (MCA) · New Delhi

JAN 2025 — PRESENT

Newton School

Full Stack Web Development · Bengaluru

AUG 2022 — AUG 2023

Nalanda Open University

Bachelor's Degree · Bihar

JUL 2018 — JUN 2021
04 Get in touch
Have a good one in mind?

Let's make
it work.

Open to interesting engineering conversations and opportunities.
singhvivek1999@yahoo.com