Junior Full-Stack Developer (TypeScript / React ・ Supabase / Postgres)
KFS GROUP · Budapest, Hungary ·
- Work mode
- Remote
- Seniority
- Junior
- Employment
- Internship
- Category
- Fullstack
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.
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.
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.
Fluent Hungarian (native or C1) and based in Hungary, as our team works in Hungarian.
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 with customers).
We care far more about how you think than about your CV length.
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.