Frontend Developer (Typescript, React.js)

Group-IB; Madrid; Presencial; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading cybersecurity firm in Madrid is seeking a Frontend Developer to work with an advanced fraud protection platform. You'll develop the GUI using TypeScript and React while implementing APIs and supporting team collaboration. Strong technical skills and a collaborative mindset are essential. The company offers a flexible work schedule, health coverage, and opportunities for professional growth.

Servicios

Flexible Work Schedule

Comprehensive Health Coverage

Certifications & Continuous Learning

Formación

• Strong proficiency in TypeScript and React.
• Good command of JavaScript across browsers.
• Hands-on experience in frontend development.

Responsabilidades

• Develop and maintain the GUI frontend.
• Design and implement Protobuf gRPC APIs.
• Write and maintain automated tests.

Conocimientos

TypeScript

React

JavaScript

Web Workers

API design

Herramientas

Docker

Kubernetes

Golang

Descripción del empleo

ABOUT GROUP-IB :

Founded in 2003 and headquartered in Singapore, Group-IB is a leading creator of cybersecurity technologies to investigate, prevent, and fight digital crime. Combating cybercrime is in the company’s DNA, shaping its technological capabilities to defend businesses, and citizens, and support law enforcement operations.

Group-IB’s Digital Crime Resistance Centers (DCRCs) are located in the Middle East, Europe, Central Asia, and Asia-Pacific to help critically analyze and promptly mitigate regional and country-specific threats. These mission‑critical units help Group-IB strengthen its contribution to global cybercrime prevention and continually expand its threat‑hunting capabilities.

ABOUT THE ROLE :

Work with Group-IB Fraud Protection — an advanced platform built to uncover and stop sophisticated online fraud. You’ll think like an adversary, analyze real-world tactics, and counter threats ranging from social engineering and account misuse to malicious bots, web injections, mobile trojans, and complex malware-driven fraud schemes.

Main responsibilities :

• Develop and maintain the GUI frontend written in TypeScript and React
• Design and implement Protobuf gRPC APIs
• Write and maintain automated tests, review code from teammates
• Develop a monitoring system for anonymized transactions
• Design and implement complex client-side scenarios
• Build a graph visualization tool for analytical exploration of relationships between various data structures

We are looking for someone who :

• Has strong proficiency in TypeScript and React, with a solid understanding of static typing and reactive programming principles
• Has a good command of JavaScript and understands how it behaves across different browsers
• Has hands‑on experience in frontend development and can review and support other developers’ code
• Knows how to work with Web Workers and various Web APIs
• Approaches architecture and coding in a structured and methodical way
• Can solve complex problems with clear, understandable solutions
• Has good technical awareness, enthusiasm, and a collaborative mindset

What else we appreciate in our team :

• Experience with MobX, Vite, and Biome JS
• Experience in designing Protobuf and gRPC APIsFamiliarity with Tanstack Query and Tanstack Router
• Experience with Golang, Docker, and Kubernetes (our backend is written in Go)
• Experience working with micro-frontends and monorepositories

Project infrastructure :

The system operates on dozens of instances worldwide, both on physical servers and in AWS. Everything runs in Kubernetes (including database operators), with CI / CD pipelines on GitLab and cluster version control via Flux CD. Monitoring and observability are handled through Zabbix, Prometheus, Alertmanager, and Grafana. This context is important to understand the scale and complexity of the project that the frontend integrates with.

OUR WORK ENVIRONMENT & CULTURE :

At Group-IB, we believe that employee happiness is fundamental to success. We foster a supportive, inclusive, and dynamic workplace where every team member is empowered to grow. Whether you’re aiming to deepen your expertise, step into leadership, explore new departments, or take your career abroad, we provide diverse opportunities for professional development.

Our team is made up of specialists from around the world who bring deep international expertise and thrive on solving complex challenges. You’ll be working with cutting‑edge technologies recognized globally by Gartner, IDC, and Forrester, and contributing to projects that span across 60 countries alongside 450+ partners and 500+ clients.

We take pride in our multicultural, values‑driven culture—where mutual respect, collaboration, and shared goals unite us across borders. And with Group-IB’s continued global growth and financial stability, your career trajectory here can accelerate faster than in most traditional environments.

WHAT DO WE OFFER

Flexible Work Schedule

We don’t believe in fixed hours—what matters is impact, not time spent. You have the freedom to design your own workday in a way that drives results and balance.

Comprehensive Health Coverage

Your well‑being comes first. We offer health insurance to support you when it matters most.

Certifications & Continuous Learning

Our team holds over 1,000 globally recognized certifications, including CEH, CISSP, OSCP, and more. Through our incentive program, we cover the cost of professional development—because your growth fuels our innovation.

Meaningful Challenges & Growth Paths

From soft skills development to advanced technical training, a wide range of internal programs help you expand your skill set—and earn recognition and rewards along the way.

Entrepreneurial spirit is encouraged

We value initiative. Whether it’s launching a tech blog, organizing events, building communities, or starting a sports team—Group-IB is a place where bold ideas are supported and celebrated.