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Zoltán Kováč

Zoltán Kováč

Full-Stack JavaScript Developer

Košice, Slovakia, SK
(+421) 948892183
Slovak, English

Background


About

About

I am Full-stack JavaScript developer with 12+ years of experience. I've worked across e-commerce, fintech, SaaS, and most recently aviation software. In several roles I've taken on technical lead responsibilities — architecture decisions, code standards, mentoring.
I work across the stack with TypeScript, Node, React and Next.js.

Work Experience

Work Experience

  • Full-Stack JavaScript Developer, r-sys

    Feb, 2025 - Present

    • Working on a new flight planning and air traffic communication app — flight plan management, messaging, and filtering of live air traffic data.

    • Real-time updates via Socket.io, with NATS as the message broker on the backend.

    • Refactoring of Mamdron app — a desktop platform with live radar, map layers, and a traffic player/recorder used by aviation agencies.

    • Stack: React, Node.js, Material UI, WebSockets, OpenLayers, MongoDB

  • Full-Stack JavaScript Developer, cod8

    Nov, 2024 - Feb, 20253 months

    • Worked on a SaaS platform for stone material management — procurement, transport, cutting through to installation. Fixed bugs and built features including sortable/filterable data tables.

    • Stack: Next.js, tRPC, Prisma, PostgreSQL

  • Full-Stack JavaScript Developer, EmbedIT

    May, 2024 - Sep, 20244 months

    • Built customer portal and e-commerce features for a telecoms provider — Next.js, React, TypeScript, Material UI.

    • Contributed to a Flutter mobile app alongside the web work.

    • Handled CI/CD with Nx monorepos.

    • Large multi-team international project that was discontinued after a change in ownership.

  • Javascript Developer · Technical LeadGWI

    Jan, 2023 - Mar, 20241 year 2 months

    • Migrated a dashboards app from Elm to React — made it a lot easier to onboard new developers and move faster.

    • Set up the full frontend architecture from scratch: TypeScript, Vite, Vitest, TanStack Query, Cypress, Zod, Single SPA, Material UI.

    • Built a data visualisation layer with 8+ chart types (bar, line, pie, donut, radar, radial) using D3.js, plus data tables with filtering and sorting.

    • Maintained CI/CD with GitHub Actions and GCP

  • Javascript Developer · Technical LeadProsight

    Aug, 2021 - Aug, 20221 year

    • Technical lead for a small dev team — code reviews, setting standards, keeping things moving.

    • Built a client management platform for financial agents in React, TypeScript, and Material UI.

    • Introduced Redux Toolkit for state management and set up a reusable form validation approach that reduced bugs on form-heavy parts of the app.

      • Built product comparison tables so agents could quickly present to the clients.
  • Software Engineer · Technical LeadEleveo a.s.

    Jun, 2018 - Jun, 20213 years

    • Frontend technical lead in the core engineering group. Owned the frontend stack — TypeScript, React, GraphQL — across call recording, quality management, and WFM products.

    • Built an internal design system used across multiple product teams.

    • Integrated Keycloak SSO on the client side — built an internal provider to integrate SSO across multiple apps

    • Replaced old chart code with Recharts.js and built Gantt charts with Highcharts Gantt for the WFM scheduling module.

    • Managed CI/CD on Bitbucket and Bamboo, kept test standards in shape with Jest and Testing Library.

  • Front-end DeveloperActum Digital

    Nov, 2015 - Apr, 20182 years 5 months

    • Developed websites and e-commerce platforms for clients including Conrad Electronics, Metro Cash & Carry, Innogy/NPower, KB, and VUB. Regularly visited client sites in Essen, Hirschau, and Birmingham.

    • Regular 1-on-1s with devs, participated in hiring process, and handled project estimates.

    • Maintained and improved the team's tooling — Webpack, Azure, Jenkins, Gulp.

    • Stack: Webpack, TypeScript, React, Next.js, React Native, Node.js

  • Web Developer, Wunderman

    Jun, 2013 - Nov, 20152 years 5 months

    • Built responsive websites for brands like Novartis, Voltaren, Ford, and Nestlé.

    • Introduced front-end standards

    • Developed cross-platform email templates

    • Stack: JavaScript, jQuery, Bootstrap, SASS, WordPress

  • Web Developer, Parallaq

    Sep, 2012 - May, 20138 months

    • Built responsive websites and back-office templates in HTML, CSS (SASS/LESS), JavaScript, jQuery. Also handled cross-platform email templates.

Skills

Skills

  • Frontend

    React.js

    Next.js

    TypeScript

    JavaScript

    Angular.js

    Redux

    TanStack Query

    D3.js

    Recharts

    Highcharts

    OpenLayers

    Material UI

    Bootstrap

    jQuery

  • Backend

    Node.js

    Express.js

    tRPC

    PostgreSQL

    MySQL

    Prisma

    REST API

    GraphQL

    Python

    PHP

    SQL

    XML

  • Mobile

    Flutter

    React Native

  • Tooling & DevOps

    Git

    GitHub Actions

    Bitbucket

    Bamboo

    Jenkins

    Docker

    AWS

    Azure

    GCP

    Nx

    Webpack

    Vite

    Gulp.js

    Yarn PnP

    Linux

  • Testing

    Cypress

    Jest

    Vitest

    Testing Library

  • Other

    Single SPA

    Zod

    React Hook Form

    Keycloak SSO

Education

Education

  • Mathematics, Leaving Exam (Matura), Math Grammar School Alejova

    Jan, 1998 - Jan, 2006