Senior Frontend Developer

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 family 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 Before applying for the above position please review our Candidate Privacy Notice here . By responding to the vacancy, you acknowledge that you have read our Privacy notice.