Vilmos Zoltan Kiss

Frontend / Fullstack (React, Node.js)

Stable systems are built for change.

I help teams turn slow, complex applications into fast, reliable products. → Interfaces handling 50K+ records, multi-criteria filtering → Event-driven systems (RabbitMQ, WebSockets) → Config-driven UIs without frontend deploys Worked on systems in enterprise SaaS, healthcare, legal, and energy — often dealing with messy, legacy codebases and turning them into stable, scalable products.

📄 View Resume (PDF)

👋 Open to remote roles — contract or full-time. Let’s connect →

What I work on

Real-Time & Event-Driven Systems — live interfaces, async processing, distributed data consistency
Data Interfaces — fast filtering and queries across large datasets, multi-step workflow states
Legacy Systems & Performance — modernising enterprise codebases, rendering optimization, API reduction

Core Stack:

React

Next.js

TypeScript

Node.js

PostgreSQL

MongoDB

Tailwind CSS

shadcn/ui

Work Highlights

Eliminated UI freezes on real-time interfaces handling 1K+ items — introduced lazy loading and reduced initial data volume, unblocking rendering under sustained load.

Architected a configuration-driven UI engine rendering dashboard layouts, filters, and forms from JSON schema — enabling non-engineering teams to ship new feature surfaces without frontend deployments.

Investigated RabbitMQ backlog failures in a memory-capped Node.js consumer handling 100k+ messages — coordinated with DevOps through broker telemetry to characterize failure modes across a distributed system.

Optimized multi-criteria search over 50K+ records using MongoDB aggregation and indexing, reducing query times from 5–10s to under 2s.

Projects

Flow Theory Visuals - Video Platform

Self-hosted platform for distributing and monetizing video content from international dance events — replacing a third-party service, saving $540/year, and generating $800+ in first-year revenue.

Designed async video processing and delivery pipeline (FFmpeg, Mux webhooks)
Built secure delivery flow with JWT-protected links, progress tracking, and blob cleanup for large file mobile delivery
Replaced third-party platform with self-hosted solution no native app infrastructure required

Tech: React, Next.js, MongoDB, Mailgun, Mux API

Library - Flow Theory Visuals →

Flow Studio - Live Event Management

Mobile-first PWA built for a 4-day social dance festival, replacing Excel-based scheduling with real-time personal planning. Deployed and used live at VLX 2024 →

Personal schedule creation with fast mobile navigation, replacing Excel/Google Sheets-based workflows
Serverless data layer using PostgreSQL (Neon, Drizzle ORM) with scheduled jobs via Vercel Cron for push notifications
Handled edge and runtime constraints in a serverless environment

Tech: React, Next.js, PostgreSQL, Drizzle ORM, PayloadCMS, PostHog, Sentry

Install Page →Main App →

VI-klinikken

Landing page and reusable React component system for a Norway-based mental health clinic.

Scalable React component system design and implementation
Translated Figma designs into production-ready UI with with structured content (Sanity CMS) integration
Improved landing page UX, increasing conversion from 1.19% → 1.74%

Tech: Next.js, React, Tailwind CSS, shadcn/ui

VI-klinikken →

@hello@vzkiss.com

• LinkedIn → • GitHub →

Remote • CET (flexible overlap)

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