Senior Frontend Developer

JGT 3; Lisboa; Híbrido; EUR 55 000 - 85 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Health insurance

Meal allowance

Remote work 52 days/year

Relocation support

AI tools access

Team growth opportunities

Resumo da oferta

JoomPro, a cross-border B2B marketplace, is seeking a Senior Frontend Developer with deep frontend expertise and an interest in AI development. You will work with React.js, TypeScript, and a broad tech stack across multiple projects to build feature-rich interfaces.

The role involves creating new features, supporting existing functionality, and refactoring to improve performance. Collaboration across teams in Portugal, Brazil, Latvia, and China is expected.

Qualificações

• Experience in developing large applications using React.js.
• Strong knowledge of native JavaScript and OOP.
• Understanding of browser event models, rendering, and animation.
• Familiar with basic patterns and algorithms; ability to assess complexity.
• Knowledge of networking protocols.

Responsabilidades

• New feature development.
• Current functionality support.
• Refactoring.

Conhecimentos

Frontend development

React.js

JavaScript

OOP concepts

Algorithms basics

Browser understanding

Ferramentas

Next.js

Express

TypeScript

Redux

react-query

Effector

Docker

Nginx

Cursor

Claude Code

Codex

Descrição da oferta de emprego

JoomPro is the first and only end-to-end cross-border B2B marketplace. It serves small, medium, and large businesses, handling orders of any size from start to finish. Today, JoomPro operates in Brazil and Mexico, with plans to expand into other markets.
JoomPro is one of the key businesses of Joom, an international tech-centric group of e-commerce companies founded in 2016 in Latvia. Joom Group also includes other businesses: Joom, a global cross-border marketplace; JoomPulse, an AI analytics tool for Mercado Livre sellers; and Onfy, a pharmaceutical marketplace in Germany. Joom Group has offices in Latvia, China, Portugal, Germany, and Brazil, with its headquarters in Lisbon, Portugal. We work as one international team, sharing knowledge and collaborating across countries, businesses and products.
We continue to grow and now we are looking for a Senior Frontend Developer with deep frontend expertise and interest in AI development and full-stack growth.
Tech stack: React.js, TypeScript, CSS-modules + many other tools on different projects (PostCSS, Sass, Effector, Next.js, Eslint, Stylelint, Express, Webpack, Cursor, Claude etc.)

Responsibilities

• New feature development
• Current functionality support
• Refactoring

Requirements

• Experience in developing large applications using React.js
• Good knowledge of native JavaScript and OOP experience
• Browser understanding: how event models work, browser rendering, animation features
• Knowledge of basic programming patterns, basic algorithms and the ability to assess their complexity
• Knowledge of network protocols

Preferred

• Experience with Effector, Redux, react-query
• Experience with Next.js, Express
• Experience with TypeScript
• Experience with AI tools: Cursor, Claude Code, Codex
• Nginx configuration and Docker experience
• Multilingual application development experience

We offer

• Compensation package: base salary and performance-based bonuses
• Office-first: flexible hours with a possibility to work remotely 52 days per year, and 22 days of paid annual leave
• Care & Wellbeing: health insurance (including dental care) for employees and their children, daily meal allowance, and 100% paid sick leave
• Relocation Support: full assistance for a smooth relocation for the employees and their famil
• AI-first approach: licenses and access to a wide range of AI tools
• Team & Growth: collaboration with colleagues across Portugal, Brazil, Latvia and China, with opportunities for promotions, professional trainings, and English courses
• Community & Engagement: annual team building activities, knowledge-sharing workshops, and a strong sense of team work