KFS GROUP
Posted 5d ago

Junior Full-Stack Developer (TypeScript / React ・ Supabase / Postgres)

KFS GROUP
Hungary or Budapest or Europe
HybridFull Time, Part Time
Responsibilities
  • building features
  • modeling data
  • reviewing code
Requirements
  • Foundation in TypeScript or JavaScript and React
  • Basic SQL or relational data knowledge
  • Critical AI-tool use
  • Clear English communication, and availability in Hungary or CET hours
Technical tools mentioned
TypeScriptJavaScriptReactNext.jsViteTailwind CSSSupabasePostgresSQLCursorCopilotClaudePythonGitGitHubDebianCloudflareMicrosoft?

Job description

Location: Hungary Type: Full-time or working student / part-time - both welcome Level: Junior ・ Working student ・ Recent graduate

Why this role

We build software that real businesses run on. You'll join a small, senior team where you own real features early ― not tickets that someone pre-chewed for you. You'll learn fast, ship to production within your first weeks, and have a senior engineer in your corner the whole way.

This is a role for someone early in their career who thinks in systems, not just syntax.

Let's be honest about AI (please read this)

We don't expect you to hand-type every line from memory, and we don't want you to. Of course you'll use Cursor, Copilot, Claude, and whatever comes next ― that's not cheating, that's the job in 2026. We want you to vibe-code.

But here's the thing the tools can't do for you: they don't know what the right answer is. We hire for that. Our focus is architecture and judgment ― the ability to decide what should be built, how the data should be shaped, where a responsibility belongs, and whether the code the AI just generated is actually correct, secure, and maintainable, or just plausible-looking.

So the bar isn't "can you write a for-loop without help." The bar is: do you understand the system well enough to steer the tools and recognize a good result when you see one? If you're early in your career but you genuinely _get_how the pieces fit together, you're exactly who we're looking for.

Tasks

What you'll do

Build product features end to end with AI-assisted tooling: database → API → React UI.

Learn to model data properly in Postgres ― schema, relationships, migrations, and Supabase Row-Level Security ― and understand why it's structured that way.

Build clean, usable interfaces in React + TypeScript.

Read, question, and improve the code you and the tools produce ― and learn to tell solid architecture from a shortcut that'll hurt later.

Grow quickly with real mentorship, code reviews, and ownership.

Our stack (what you'll learn on the job)

Languages: TypeScript, Python

Frontend: React, [Next.js / Vite], Tailwind CSS

Backend / Data: Supabase (Postgres, Auth, Storage, Edge Functions), SQL, RLS

Tooling: Git/GitHub, CI/CD, Claudflare, and the AI dev tools you already use

AI-native workflow: Cursor / Copilot / Claude as a normal part of how we build

Sysops: Debian, terminal, etc

You won't know all of this on day one. No junior does. You'll learn it here.

Requirements

What we're looking for

Must-haves

A real foundation in TypeScript / JavaScript and React ― through study, side projects, an internship, or things you've built for fun.

Architectural curiosity: you care why code is structured a certain way, not just whether it runs.

Basic comfort with SQL / relational data ― or the clear ability to pick it up fast.

You use AI dev tools well and critically ― you don't blindly paste whatever they output.

You communicate clearly in English and you're genuinely eager to learn.

Based in Hungary, or able to work reliably within CET hours.

Nice-to-haves

A GitHub or portfolio with something you actually built - however small or messy.

Exposure to Supabase, Firebase, or any Postgres-backed app.

An eye for UI/UX.

Currently studying computer science or similar (working-student arrangement very welcome).

German or another European language (not required ― English is our working language).

We care far more about how you think than about your CV length.

Benefits

How we work

Small team ― you learn directly from people who've shipped a lot, and your work matters from week one.

Hybrid: a real office in HU plus flexibility to work from home most of the week.

Student-friendly: flexible hours; we'll work around your lectures and exams.

Low bureaucracy: clear ownership, short feedback loops, no death-by-process.

What we offer

Fair junior compensation with clear room to grow.

Real mentorship ― not "figure it out alone."

Modern hardware and the AI tooling you need.

A learning budget for courses, books, and conferences.

The chance to grow into a serious engineer on a product that real customers use.

How to apply

Send a short note about yourself plus your GitHub / portfolio / LinkedIn. Built something you're proud of ― or even something broken you learned from? Link it. A CV is welcome, but what you've made and how you think tells us more.

No essay required. We review every application and reply to everyone.

About KFS GROUP

German private consulting firm helping manufacturing companies improve operations, supply chains, digital systems, and AI-powered production.

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