UI Senior Developer (Full Remote)

📍 Job Overview

Job Title: Senior UI Developer (Full Remote)

Company: Starfinder (for an international technology player)

Location: Remote

Job Type: Full-time

Category: Software Development / Frontend Engineering

Date Posted: 2026-08-27

Experience Level: Senior (6+ years)

Remote Status: Full Remote

🚀 Role Summary

• Develop and maintain ultra-high-performance, cross-browser compatible user interfaces for a sophisticated global peer-to-peer exchange platform.

• Architect and build robust, reusable UI components within a scalable, multi-brand architecture, contributing to a distributed component library managed via npm.

• Collaborate closely with designers and backend engineers to drive innovative UI solutions and ensure an exceptional user experience (UX).

• Optimize UI performance across various devices and manage rapid prototyping initiatives.

• Participate in an Agile and highly collaborative development environment, ensuring adherence to design systems and style guides.

📝 Enhancement Note: This role is critical for the user-facing aspects of a high-volume, global exchange platform, demanding a strong focus on performance, scalability, and user experience. The "multi-brand" aspect suggests the need for flexible UI architecture that can support diverse product identities.

📈 Primary Responsibilities

• Design, develop, and implement responsive and performant front-end features using React.js, HTML5, CSS3 (SCSS Modules), and modern JavaScript (ES6+, async/await, generators).

• Manage and enhance a shared component library distributed via npm, ensuring reusability and consistency across multiple products.

• Integrate UI components with backend services via REST APIs and WebSockets, ensuring seamless data flow and real-time updates.

• Implement robust state management solutions using Redux, Redux-Saga, and Immutable.js to handle complex application states.

• Optimize build processes using Webpack and implement code-splitting strategies for improved performance and faster load times.

• Write comprehensive unit and component tests using Jest and Enzyme to ensure code quality and maintainability.

• Collaborate with UX/UI designers to translate design mockups and wireframes into high-quality, interactive user interfaces, adhering to design systems and style guides.

• Troubleshoot and debug complex UI issues, ensuring compatibility across all current browsers and devices.

• Participate actively in Agile ceremonies, including sprint planning, daily stand-ups, and retrospectives.

• Contribute to CI/CD pipelines, ensuring smooth and automated deployment of frontend applications.

📝 Enhancement Note: The responsibilities emphasize not just development but also architectural contributions, performance optimization, and cross-functional collaboration, typical of a senior-level engineering role. The mention of "multi-brand" architecture and a shared npm library highlights the importance of scalable design patterns and modularity.

🎓 Skills & Qualifications

Education: While not explicitly stated, a Bachelor's degree in Computer Science, Engineering, or a related field is typically expected for senior development roles. Equivalent practical experience will also be considered.

Experience: Minimum of 6 years of professional experience in UI development.

Required Skills:

• Core Stack: Proficient in React.js, HTML5, CSS3 (SCSS Modules), and modern JavaScript (ES6+, async/await, generators).

• State Management: Deep experience with Redux, Redux-Saga, and Immutable.js.

• Build Tools: Strong understanding of Webpack for build optimization and code-splitting.

• Testing: Experience with unit and component testing frameworks such as Jest and Enzyme.

• API Integration: Proven ability to connect with backend services via REST APIs and WebSocket.

• Tooling: Proficient with Yarn, Git, CI/CD pipelines, ESLint, and Prettier.

• Problem-Solving: Strong analytical and problem-solving skills.

• Teamwork: Excellent collaboration and communication skills, with the ability to work autonomously.

• English Proficiency: Very good command of spoken and written English (at least B2 level).

Preferred Skills:

• TypeScript knowledge (migration in progress).

• Experience with Vite build tool.

• Familiarity with React Testing Library.

• Understanding of React 18+ features.

• Knowledge of internationalization libraries (e.g., i18next).

• Experience with data visualization libraries (e.g., Recharts).

• Ability to follow and influence design systems and style guides.

• Flexibility in adapting to changing requirements.

📝 Enhancement Note: The detailed list of required technologies and preferred skills points to a modern, robust frontend stack. The emphasis on both core development skills and supporting tools like testing, build optimization, and API integration is crucial for a senior role. The "migration in progress" for TypeScript suggests an opportunity for candidates to contribute to this transition.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of complex UI projects demonstrating proficiency in React.js, modern JavaScript, and CSS.

• Examples of reusable component libraries or design system contributions.

• Case studies detailing performance optimization strategies and their impact on user experience.

• Demonstrations of robust state management implementation (e.g., Redux patterns).

• Evidence of unit and integration testing practices applied to frontend code.

• Projects involving API integrations (REST/WebSocket) and asynchronous operations. Process Documentation:

• Examples of how you've contributed to or maintained design systems and style guides.

• Documentation of build optimization processes or contributions to CI/CD pipelines.

• Personal workflow for rapid prototyping and iterative development.

• Examples of how you've managed code quality through linters (ESLint) and formatters (Prettier).

📝 Enhancement Note: A strong portfolio demonstrating practical application of the required technologies, particularly in complex, high-performance UI development, will be essential. The ability to showcase architectural thinking and process improvement will set candidates apart.

💵 Compensation & Benefits

Salary Range: €40,000 - €50,000 gross per year (RAL indicativa).

Benefits:

• International Environment: Opportunity to work within a dynamic, global team.

• Growth Opportunities: Excellent potential for career advancement and professional development.

• Competitive Salary: Attractive compensation package commensurate with experience.

• Full Remote Work: The flexibility to work entirely from home.

• Dynamic Work Environment: Be part of a cutting-edge technology company.

Working Hours: Full-time employment, with an implied standard 40-hour work week. Given the full remote nature, flexibility may be offered, but core collaboration hours will likely apply.

📝 Enhancement Note: The salary range is provided as a gross annual figure, common in Italy. The benefits highlight the international nature and growth potential, which are key attractors for senior tech roles.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Fintech / ICT Services. The company operates a sophisticated global peer-to-peer exchange platform handling significant daily API calls and transaction volumes, placing it at the intersection of technology and finance.

Company Size: Described as an "importante player tecnologico internazionale," suggesting a medium to large enterprise with a global footprint.

Founded: Not specified, but the description implies an established company with significant operational scale.

Team Structure:

• The role is within an "Agile and highly collaborative" environment.

• The UI Developer will work closely with UI Designers and Backend Teams.

• The development team likely operates in cross-functional squads or pods, common in Agile settings.

• The Senior UI Developer is expected to influence design systems and style guides, indicating a degree of autonomy and leadership within the team. Methodology:

• Agile Development: The team operates using Agile methodologies, implying iterative development, frequent feedback loops, and adaptability.

• Component-Based Architecture: Emphasis on reusable components and a shared library points to a modular and scalable approach.

• Performance-Driven: The platform's scale (450M+ API calls/day) necessitates a strong focus on UI performance optimization.

• Collaboration: Close collaboration between frontend, backend, and design teams is a core aspect of the workflow.

Company Website: https://www.starfinder.it (This is the agency's website; the client's website is not directly provided but is described as an international technology player.)

📝 Enhancement Note: The company operates at a significant scale in a demanding sector. The culture is likely fast-paced, innovative, and collaborative, with a strong emphasis on technical excellence and user experience.

📈 Career & Growth Analysis

Operations Career Level: Senior Frontend Developer. This role is positioned as a senior individual contributor, responsible for complex development tasks, architectural input, and mentoring junior developers. The "Senior" title implies a need for leadership in technical decision-making and best practices.

Reporting Structure: Likely reports to a Frontend Lead, Engineering Manager, or Head of Engineering. The role involves close collaboration with designers and backend engineers.

Operations Impact: The UI developer's work directly impacts the user experience and performance of a critical global exchange platform. High-quality UI development is essential for user adoption, transaction efficiency, and maintaining the company's competitive edge in a high-volume market. The ability to influence design systems also contributes to brand consistency and efficiency across products.

Growth Opportunities:

• Technical Specialization: Deepen expertise in React, TypeScript, performance optimization, or specific areas like state management or testing frameworks.

• Architectural Leadership: Contribute to evolving the UI architecture, design systems, and component library strategy.

• Mentorship: Guide and mentor junior developers within the frontend team.

• Cross-functional Exposure: Gain deeper understanding of backend systems and API design.

• Potential for Lead Roles: As experience grows, opportunities to move into Tech Lead or Architect positions may arise.

📝 Enhancement Note: This role offers significant opportunities for technical growth and impact within a high-scale technology environment. The company's global reach and focus on innovation suggest a rewarding career path for skilled frontend engineers.

🌐 Work Environment

Office Type: Fully Remote. This role offers complete flexibility to work from any location.

Office Location(s): While the company is an "international technology player," the specific office locations are not detailed. However, the remote nature means physical office presence is not required.

Workspace Context:

• Remote Collaboration Tools: Expect to utilize a suite of tools for communication, project management, and code collaboration (e.g., Slack, Jira, Confluence, Git platforms).

• Agile Environment: The workspace is described as Agile and highly collaborative, fostering open communication and teamwork despite the remote setup.

• Technology Stack: Access to modern development tools and infrastructure necessary for building and deploying high-performance web applications.

Work Schedule: Full-time (40 hours/week implied), with the inherent flexibility of a remote position. However, candidates should be prepared to align with team synchronization points and potential overlap with global team members.

📝 Enhancement Note: The fully remote nature is a significant benefit, offering autonomy and work-life balance. Candidates should be self-motivated and adept at remote collaboration.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Likely a recruiter screen (Starfinder) to assess basic qualifications, experience, and cultural fit.

• Technical Interview 1 (Coding Challenge/Live Coding): Expect a practical assessment of coding skills, problem-solving abilities, and familiarity with core technologies (e.g., React, JavaScript). This might involve a take-home assignment or a live coding session.

• Technical Interview 2 (System Design/Architecture): A discussion focused on architectural patterns, component design, state management strategies, and performance optimization for complex UIs. You might be asked to discuss how you'd approach building specific features or scaling existing ones.

• Hiring Manager/Team Lead Interview: Focus on team fit, collaboration style, Agile experience, and deeper dive into your career motivations and past projects.

• Final Interview (Potentially with Senior Leadership): To confirm overall fit, discuss strategic alignment, and finalize the offer.

Portfolio Review Tips:

• Curate Select Projects: Choose 2-3 significant projects that best showcase your React.js expertise, architectural thinking, and ability to solve complex UI problems.

• Highlight Key Contributions: For each project, clearly articulate your specific role, the challenges faced, the solutions implemented (especially regarding performance, scalability, and state management), and the outcomes achieved.

• Demonstrate Code Quality: If possible, link to public repositories (e.g., GitHub) or provide code snippets that exemplify clean code, good testing practices, and modern JavaScript/React patterns.

• Explain Design System Impact: If you've worked with or influenced design systems, be ready to explain how you ensured consistency and reusability.

• Showcase Performance Optimization: Detail any performance tuning efforts, code-splitting strategies, or optimizations made for various devices.

Challenge Preparation:

• Practice React Concepts: Thoroughly review React hooks, component lifecycle, context API, performance optimization techniques (memoization, lazy loading), and state management patterns.

• JavaScript Fundamentals: Brush up on modern JavaScript features (ES6+, async/await, Promises, generators) and common algorithms.

• Build Tools & Testing: Understand the principles behind Webpack, code-splitting, and how to effectively use Jest/Enzyme for testing React components.

• API Interaction: Be ready to discuss how to handle API calls, errors, and real-time data updates using REST and WebSockets.

• Agile & Collaboration: Prepare to discuss your experience working in Agile teams, your approach to code reviews, and how you collaborate with designers and backend engineers.

📝 Enhancement Note: The interview process will likely be rigorous, focusing heavily on practical application of skills and architectural understanding. A well-prepared portfolio that directly addresses the job requirements is crucial for success.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Framework: React.js (core competency)

• JavaScript: ES6+, async/await, generators

• Styling: CSS3 (SCSS Modules)

• State Management: Redux, Redux-Saga, Immutable.js

• Build Tools: Webpack, Vite (preferred)

• Testing: Jest, Enzyme, React Testing Library (preferred)

• Package Manager: Yarn

• Version Control: Git

• Linters/Formatters: ESLint, Prettier

• API Communication: REST APIs, WebSocket

Analytics & Reporting: While not explicitly mentioned for UI Dev, understanding how UI performance metrics are tracked and reported would be beneficial. Tools like Lighthouse, WebPageTest, or browser developer tools are essential for performance analysis.

CRM & Automation: Not directly applicable to this role's core responsibilities, but understanding how frontend interacts with backend systems that might use CRMs is helpful context.

📝 Enhancement Note: This stack represents a modern, high-performance frontend development environment. Proficiency across these tools, especially React.js and its ecosystem, is paramount. Familiarity with TypeScript and newer tools like Vite will be advantageous.

👥 Team Culture & Values

Operations Values:

• Technical Excellence: A drive for building high-quality, performant, and maintainable code.

• Collaboration: Strong emphasis on teamwork, open communication, and knowledge sharing across disciplines.

• Innovation: Encouraging the exploration of new technologies and creative solutions to drive UI innovation and UX improvements.

• Agility & Adaptability: Embracing change, iterating quickly, and responding effectively to evolving requirements.

• User-Centricity: A commitment to delivering exceptional user experiences that align with business goals.

Collaboration Style:

• Agile & Iterative: Working in sprints, with continuous feedback and adaptation.

• Cross-functional: Seamless interaction between frontend, backend, and design teams.

• Empowered Teams: Developers are likely empowered to make technical decisions and influence project direction.

• Remote-First Communication: Reliance on digital tools for effective communication and collaboration in a distributed environment.

📝 Enhancement Note: The culture appears to value technical skill, collaboration, and adaptability, essential for a fast-paced, global technology company. The ability to thrive in a remote, Agile setting is key.

⚡ Challenges & Growth Opportunities

Challenges:

• Performance at Scale: Ensuring UI performance remains optimal with increasing data volumes and user traffic on a global exchange platform.

• Maintaining Consistency: Managing a shared component library and design system across multiple products and brands requires rigorous governance.

• Rapid Prototyping & Iteration: Balancing the need for speed with code quality and maintainability in an Agile environment.

• Cross-Browser/Device Compatibility: Ensuring a consistent and high-quality experience across a wide range of user environments.

• Adopting New Technologies: Successfully integrating new tools like TypeScript and Vite into an existing, high-volume production environment.

Learning & Development Opportunities:

• Deep Dive into React Ecosystem: Advanced training in React features, performance tuning, and related libraries.

• TypeScript Mastery: Opportunity to become proficient in TypeScript through an ongoing migration project.

• Architectural Design: Contribute to the evolution of the UI architecture and design systems.

• Performance Engineering: Develop specialized skills in front-end performance optimization and profiling.

• Cross-Disciplinary Learning: Exposure to backend technologies and financial trading platform concepts.

📝 Enhancement Note: This role presents challenging but rewarding opportunities for professional growth, particularly in areas of high-performance computing, large-scale system architecture, and modern frontend development practices.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI component you built. What were the challenges, and how did you ensure its performance and reusability?" (Focus on React.js, state management, performance optimization)

• "How would you approach building a scalable, multi-brand UI architecture? What patterns would you consider?" (Focus on architectural thinking, component design, design systems)

• "Imagine a scenario where backend API response times are high. How would you optimize the UI experience to mitigate this?" (Focus on async handling, loading states, optimistic updates, caching)

• "Discuss your experience with Redux. How have you managed complex state, and what are the trade-offs of different state management approaches?" (Focus on Redux, Redux-Saga, Immutable.js) Company & Culture Questions:

• "What interests you about working on a global peer-to-peer exchange platform?" (Show understanding of the industry and scale)

• "How do you approach collaboration in a fully remote, Agile environment?" (Highlight communication skills, proactivity, and teamwork)

• "What is your experience with design systems and style guides? How do you ensure consistency?" (Demonstrate understanding of design governance)

• "How do you stay updated with the latest trends in frontend development?" (Show commitment to continuous learning) Portfolio Presentation Strategy:

• Storytelling: Frame your projects as narratives: the problem, your solution, the technologies used, and the impact.

• Focus on Impact: Quantify achievements where possible (e.g., "improved load time by X%", "reduced component errors by Y%").

• Technical Depth: Be prepared to explain the why behind your technical choices, not just the what.

• Address Requirements: Explicitly link your portfolio examples to the skills and responsibilities listed in the job description.

• Showcase Code Quality: Be ready to discuss your coding standards, testing strategies, and approach to maintainability.

📝 Enhancement Note: Prepare to discuss your experience with specific technologies in depth, demonstrate architectural thinking, and articulate how your skills align with the company's high-scale, global operations.

📌 Application Steps

To apply for this operations position:

• Submit your application through the provided link on the Starfinder Zoho Recruit portal.

• Tailor Your Resume: Highlight your 6+ years of UI development experience, emphasizing React.js, modern JavaScript, state management (Redux), and performance optimization. Use keywords from the job description.

• Curate Your Portfolio: Select 2-3 of your strongest projects that showcase your skills in React.js, component architecture, and performance. Prepare to walk through them, explaining your contributions and the technical challenges overcome.

• Prepare for Technical Assessments: Practice coding challenges focused on React, JavaScript, and algorithms. Be ready to discuss your approach to UI architecture and state management.

• Research the Company & Industry: Understand the nature of peer-to-peer exchange platforms and the challenges of operating at a global scale. This will help you tailor your answers and demonstrate genuine interest.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.

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