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

Budapest, Central Hungary, Hungary · Hybrid

Entry level

<p><strong>Location:</strong> Hungary <strong>Type:</strong> Full-time or working student / part-time - both welcome <strong>Level:</strong> Junior ・ Working student ・ Recent graduate</p> <p><strong>Why this role</strong…

Skills: TypeScript, React, Supabase, Postgres, SQL

KFS GROUP logo

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

KFS GROUP

Budapest, Central Hungary, Hungary • Hybrid

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Entry level

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  • Full-time
  • bachelor degree
  • Hybrid Work, Flexible Hours For Students, Fair Junior Compensation, Mentorship, Modern Hardware, AI Tooling
  • Posted 4d ago
  • ~40 hrs/week

Responsibilities

Build end-to-end product features including database schemas, APIs, and React user interfaces using AI-assisted tooling. Focus on proper data modeling in Postgres and maintaining clean, secure, and maintainable architecture.

Requirements

Requires a strong foundation in TypeScript, JavaScript, and React, along with basic comfort with SQL and relational data. Candidates must be based in Hungary or CET hours and demonstrate the ability to use AI development tools critically.

Full 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 gethow 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.

Related keywords

TypeScriptReactSupabasePostgresSQLPythonNext.jsViteTailwind CSSGitGitHubCI/CDCloudflareCursorCopilotClaude

About KFS GROUP

LinkedInVisit site

digital business excellence

Industry
Business Consulting and Services
Company size
11-50 employees
Founded
2010
Headquarters
Unterhaching, Bavaria
LinkedIn followers
329

Your advantage: - Professional competence by joining methodological skills and technical knowledge in electronics, plastics and metal - Cross-cultural awareness and worldwide consulting expertise, focusing on Asia, Latin America and Eastern Europe - Transparency and efficiency by the use of state of the art information and telecommunication systems - Flexibility by an optimized ratio of permanent employees and freelance service providers (contractors) Technology & Services: Supplier Management Manufacturing & Quality Procurement & Logistics Engineering Services

Offices: Kapellenstraße 22, Unterhaching, Bavaria 82008, DE

New Product IntroductionSupply Chain ManagementQuality Managementand Strategy & OrganizationConsultingAutomotive
View all jobs at KFS GROUP

About KFS GROUP

LinkedInVisit site

digital business excellence

Industry
Business Consulting and Services
Company size
11-50 employees
Founded
2010
Headquarters
Unterhaching, Bavaria
LinkedIn followers
329

Your advantage: - Professional competence by joining methodological skills and technical knowledge in electronics, plastics and metal - Cross-cultural awareness and worldwide consulting expertise, focusing on Asia, Latin America and Eastern Europe - Transparency and efficiency by the use of state of the art information and telecommunication systems - Flexibility by an optimized ratio of permanent employees and freelance service providers (contractors) Technology & Services: Supplier Management Manufacturing & Quality Procurement & Logistics Engineering Services

Offices: Kapellenstraße 22, Unterhaching, Bavaria 82008, DE

New Product IntroductionSupply Chain ManagementQuality Managementand Strategy & OrganizationConsultingAutomotive
View all jobs at KFS GROUP

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