SENIOR FRONTEND DEVELOPER / QA (HYBRID)

Description

Summary: This role involves building modern analytics platforms to process and visualize real-time financial data using cutting-edge frontend technologies. Highlights: 1. Work on highly scalable applications with focus on performance and UX 2. Collaborate with diverse teams to deliver innovative frontend solutions 3. Build sophisticated web applications handling large volumes of real-time data #### **SENIOR FRONTEND DEVELOPER / QA (HYBRID LISBON)** Portuguese company hires for hybrid position Location: Lisbon, Portugal * ️ Only candidates already based in Portugal will be considered Work Model: Hybrid ️ Language Requirements: Proficient English (Mandatory) Seniority: Senior (5\+ years) Sector: Banking Rate Between €4900 \- 5200 RV / €2900 \- 3200 CTI * ️ Instructions: Please send your CV in English and make sure to include all skills and experience that match the requirements of the opportunity. This will significantly increase your chances of success #### **Build High\-Performance Financial Analytics Applications** We are looking for a **Senior Frontend Developer** to join an international engineering team responsible for building a modern analytics platform used to process and visualize real\-time financial data. This is an opportunity to work on highly scalable applications where performance, reliability, and user experience are essential. You'll collaborate with engineers, business stakeholders, and production support teams to deliver innovative frontend solutions using the latest JavaScript technologies and modern testing practices. If you're passionate about creating fast, scalable, and maintainable web applications while working with cutting\-edge frontend technologies, we'd love to hear from you. #### **Your Responsibilities** * Develop and maintain high\-performance, real\-time frontend applications. * Design scalable and maintainable UI architectures. * Build responsive and intuitive user interfaces using React and Next.js. * Participate in the complete Software Development Life Cycle (SDLC), including analysis, development, testing, documentation, and code reviews. * Collaborate with Agile teams to deliver high\-quality software. * Work closely with production support teams during releases and maintenance. * Communicate directly with business stakeholders to understand requirements. * Provide third\-level (L3\) application support when necessary. * Ensure applications meet the highest standards for performance, scalability, security, and reliability. * Continuously improve frontend architecture and development practices. #### **Required Technical Skills** * 5\+ years of professional frontend software development experience. * Strong experience with JavaScript and TypeScript. * Advanced experience with React 18\+. * Experience developing applications using Next.js. * Strong HTML5 and CSS skills. * Experience designing scalable frontend architectures. * Knowledge of modern frontend build tools and development workflows. * Understanding of bundlers, module systems (ESM/CJS), tree shaking, and code splitting. * Basic knowledge of CI/CD pipelines. * Experience with automated testing, including: * Unit Testing * Integration Testing * End\-to\-End Testing * Experience with Jest. * Experience with Playwright. * Experience working with high\-performance data grids such as AgGrid, DevExtreme, or Finos Perspective. #### **Nice to Have** * Experience working in Banking, Financial Services, or Capital Markets. * Knowledge of Cash Equities or Electronic Trading platforms. * Experience developing real\-time financial applications. * Familiarity with performance optimization for large\-scale frontend applications. #### **Soft Skills** * Strong analytical and problem\-solving skills. * Excellent attention to detail. * Curious and proactive mindset. * Ability to thrive in fast\-changing environments. * Strong communication skills. * Comfortable collaborating within globally distributed teams. * Ownership mentality and commitment to software quality. #### **What You'll Find** * An international engineering environment. * Large\-scale enterprise applications with real business impact. * Modern frontend technology stack. * Opportunity to work on high\-performance, data\-intensive applications. * Collaborative Agile culture. * Exposure to complex business domains and advanced UI engineering challenges. * Career growth through technically challenging projects. #### **Ideal Candidate Profile** You are an experienced Frontend Engineer who enjoys building sophisticated web applications that handle large volumes of real\-time data. You combine strong technical expertise with a passion for clean architecture, testing, and performance optimization. You are comfortable collaborating with cross\-functional teams, communicating with business stakeholders, and taking ownership of mission\-critical applications. You value code quality, continuous learning, and enjoy solving complex technical challenges in an Agile environment. #### **Before You Apply, Ask Yourself** * Do I have at least 5 years of frontend development experience? * Am I highly proficient with JavaScript and TypeScript? * Have I built production applications using React 18\+ and Next.js? * Do I have experience designing scalable frontend architectures? * Have I worked with Jest and Playwright for automated testing? * Am I familiar with modern frontend tooling such as bundlers, ESM/CJS, tree shaking, and code splitting? * Have I worked with high\-performance data grids like AgGrid or DevExtreme? * Can I communicate effectively in English within an international team? * Have I supported production systems and collaborated with business stakeholders? * Am I currently based in Portugal and available to work in a hybrid model? #### **Keywords for your CV:** Senior Frontend Developer, Frontend Engineer, React, React 18, Next.js, NextJS, JavaScript, TypeScript, HTML5, CSS3, Redux, UI Architecture, Frontend Architecture, Scalable Applications, Real\-Time Applications, High Performance UI, Jest, Playwright, Unit Testing, Integration Testing, End\-to\-End Testing, QA, Test Automation, CI/CD, Bundlers, ESM, CJS, Tree Shaking, Code Splitting, AgGrid, DevExtreme, Finos Perspective, Performance Optimization, Agile, SDLC, Code Review, Production Support, L3 Support, Financial Services, Banking, Capital Markets, Cash Equities, Hybrid, Lisbon, Portugal \#CI \- PROC26394