UI Senior Developer (Full Remote)

📍 Job Overview

Job Title: UI Senior Developer (Full Remote)

Company: Starfinder

Location: Trento, Trentino – Alto Adige, Italy (Full Remote)

Job Type: Full-Time

Category: Software Engineering / UI Development

Date Posted: April 22, 2026

Experience Level: Senior (5-10 years)

Remote Status: Full Remote

🚀 Role Summary

• Spearhead the development of ultra-high-performance, cross-browser compatible User Interfaces for a sophisticated global peer-to-peer exchange platform.

• Architect and implement robust, reusable UI components to support a scalable, multi-brand architecture, ensuring seamless integration across diverse products.

• Maintain and enhance a shared component library distributed via npm, fostering consistency and efficiency across multiple product lines.

• Drive UI innovation by collaborating closely with designers and backend teams to deliver exceptional User Experience (UX) and cutting-edge solutions.

• Optimize application performance across various devices and manage rapid prototyping cycles to accelerate development and validate concepts.

📝 Enhancement Note: This role is positioned as a Senior UI Developer, indicating a need for significant technical expertise, architectural input, and potential mentorship capabilities within the UI development domain. The focus on a peer-to-peer exchange platform suggests a high-stakes environment requiring robust, secure, and performant frontend solutions.

📈 Primary Responsibilities

• Develop and maintain cutting-edge, performant, and responsive user interfaces using React.js, HTML5, and CSS3 (SCSS Modules).

• Implement complex state management solutions leveraging Redux, Redux-Saga, and Immutable.js to ensure predictable application behavior.

• Optimize build processes and code-splitting strategies using Webpack to enhance application load times and performance.

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

• Integrate frontend applications with backend services through REST APIs and WebSocket connections for real-time data exchange.

• Utilize Yarn, Git, ESLint, and Prettier for efficient development workflows, version control, and code standardization.

• Contribute to the ongoing migration to TypeScript and explore the adoption of Vite for enhanced build performance.

• Collaborate with product managers, designers, and backend engineers to translate requirements into effective UI solutions.

• Participate actively in Agile ceremonies, including sprint planning, daily stand-ups, and retrospectives, contributing to continuous process improvement.

• Ensure adherence to design systems and style guides, maintaining visual consistency and brand integrity across all UIs.

📝 Enhancement Note: The responsibilities highlight a strong emphasis on core frontend technologies, advanced state management, build optimization, and robust testing practices, all critical for developing enterprise-grade applications in a high-volume trading environment. The mention of TypeScript migration and Vite suggests an organization that values modern tooling and continuous improvement.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience, is typically expected for a Senior Developer role.

Experience: A minimum of 6 years of professional experience in UI development, with a proven track record of building and deploying complex, scalable web applications.

Required Skills:

• Expert proficiency in React.js, HTML5, and CSS3 (including SCSS Modules).

• Deep understanding of modern JavaScript features (ES6+, async/await, generators).

• Extensive experience with state management libraries such as Redux, Redux-Saga, and Immutable.js.

• Strong knowledge of build tools and optimization techniques, specifically Webpack and code-splitting.

• Proficiency in writing unit and component testing frameworks like Jest and Enzyme.

• Experience connecting frontend applications via REST API and WebSocket.

• Familiarity with development tooling including Yarn, Git, CI/CD pipelines, ESLint, and Prettier.

• Demonstrated ability in problem-solving, autonomy, and effective teamwork.

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

• Flexibility and adaptability to changing requirements.

Preferred Skills:

• Experience with TypeScript and familiarity with migration processes.

• Knowledge of Vite as a build tool.

• Familiarity with React Testing Library.

• Experience with React 18+ features.

• Understanding of internationalization (i18n) concepts and libraries like i18next.

• Exposure to data visualization libraries such as Recharts.

📝 Enhancement Note: The "Required Skills" list is extensive and highly technical, emphasizing a need for candidates with deep, hands-on experience in the specified technologies. The "Preferred Skills" indicate areas where the company is evolving or values additional expertise, offering a potential differentiator for candidates.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase end-to-end UI development projects demonstrating proficiency in React.js, state management, and API integrations.

• Include examples of reusable component libraries or contributions to design systems, highlighting architecture and maintainability.

• Present case studies on performance optimization, detailing methodologies used to improve load times and application responsiveness.

• Demonstrate experience with testing strategies, including unit, integration, and component testing, showcasing the impact on code quality.

Process Documentation:

• Document a complex UI feature implementation from conception to deployment, detailing design decisions, challenges, and solutions.

• Illustrate your approach to maintaining and evolving a shared component library, including version control and distribution strategies.

• Explain your process for collaborating with backend teams on API integration and WebSocket communication, emphasizing error handling and data flow.

• Detail your experience working within an Agile development framework, including participation in ceremonies and contribution to process improvements.

📝 Enhancement Note: For a Senior UI Developer role, a strong portfolio is crucial. It should not only showcase technical skills but also demonstrate architectural thinking, problem-solving capabilities, and an understanding of the full development lifecycle within an Agile context. Emphasis should be placed on projects that highlight performance, scalability, and maintainability.

💵 Compensation & Benefits

Salary Range: €40,000 - €50,000 gross per year.

• Methodology: This range is explicitly provided in the job description. It is considered competitive for a Senior UI Developer role in Italy, especially for a fully remote position within a specialized tech company. The gross annual salary (RAL - Retribuzione Annua Lorda) is standard for Italian compensation structures.

Benefits:

• Work in an international and dynamic environment.

• Excellent opportunities for professional growth and career advancement.

• Competitive salary package.

• Fully remote working arrangement, offering flexibility and work-life balance.

• Opportunity to work on cutting-edge technology within the fintech/exchange sector.

Working Hours: The job description implies a standard full-time work week, likely around 40 hours, aligning with the provided annual salary. Specific working hours may be flexible given the fully remote nature, but adherence to Agile team synchronization needs will be required.

📝 Enhancement Note: The salary range is clearly stated. The benefits, while somewhat general, highlight the international scope and growth potential, which are attractive aspects for senior technical roles. The lack of highly specific benefits like extensive health coverage or stock options might be typical for some European tech companies, but candidates should inquire for further details.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Fintech (specifically, a peer-to-peer exchange platform). This sector is characterized by rapid innovation, high security demands, and a focus on performance and scalability.

Company Size: "Important player technology international" suggests a medium to large-sized organization, likely with established processes and a global presence.

Founded: Not specified, but the description implies a mature company operating at a significant scale (450 million API calls/day).

Team Structure:

• The UI Developer will be part of an Agile team, working collaboratively with designers and backend developers.

• This implies a cross-functional team structure focused on delivering specific product features or components.

Methodology:

• The team operates in an Agile environment, emphasizing iterative development, collaboration, and continuous improvement.

• Focus on developing a robust, scalable architecture for a multi-brand platform.

• Emphasis on maintaining and distributing a shared npm component library, suggesting a component-driven development and a commitment to internal tooling efficiency.

• Data-driven decision-making is implied through the scale of operations (API calls, transaction volumes) and the need for performance optimization.

Company Website: https://www.starfinder.it

📝 Enhancement Note: Starfinder appears to be a recruitment agency. The "company" the candidate will work for is an "important international technology player" in the fintech exchange space. This distinction is important; the culture and environment will be that of the end client, not Starfinder itself. The description emphasizes a fast-paced, innovative, and collaborative environment common in the fintech sector.

📈 Career & Growth Analysis

Operations Career Level: This role is a Senior UI Developer. This level signifies a high degree of technical autonomy, responsibility for complex feature development, architectural input, and potentially mentoring junior developers. The focus is on deep technical expertise in frontend development, particularly within the React ecosystem.

Reporting Structure: The Senior UI Developer will likely report to a Lead UI Developer, Engineering Manager, or potentially a Head of Frontend Engineering. They will work closely with UI/UX designers and backend engineers within an Agile team structure.

Operations Impact: The Senior UI Developer's impact is direct and significant. They are responsible for the user-facing aspects of a high-volume, critical financial platform. Their work directly influences:

• User Experience (UX): Ensuring an intuitive, efficient, and positive user journey for traders and platform users.

• Platform Performance: Optimizing frontend speed and responsiveness, which is critical in a trading environment where milliseconds matter.

• Scalability & Maintainability: Building components and architecture that can support future growth, new features, and multiple brands.

• Development Velocity: Through shared libraries and efficient processes, they enable faster feature delivery across the organization.

Growth Opportunities:

• Technical Specialization: Deepen expertise in React, state management, performance optimization, or explore emerging frontend technologies and frameworks.

• Architectural Leadership: Transition into roles like Principal UI Engineer or Frontend Architect, taking ownership of the overall frontend technical strategy.

• Team Leadership: Move into a Lead Developer or Team Lead position, managing a team of UI developers, overseeing project delivery, and mentoring team members.

• Cross-functional Expansion: Gain broader experience in backend technologies, DevOps, or product management by working closely with these teams.

• Fintech Domain Expertise: Develop specialized knowledge in financial technology, trading systems, and security protocols, becoming an expert in this niche.

📝 Enhancement Note: The "Operations" in the prompt is interpreted here as "Development Operations" or "Engineering Operations" in the context of a Senior Developer role. The growth path is clearly defined within the technical track, with opportunities for leadership and specialization.

🌐 Work Environment

Office Type: Fully Remote. This means the primary work environment is a home office setup managed by the employee.

Office Location(s): While the job is remote and based out of Italy (Trento mentioned), the company is an "international player," suggesting potential for collaboration with teams across different time zones and potentially virtual office spaces or collaboration platforms.

Workspace Context:

• Autonomy: High degree of autonomy in managing one's work environment and schedule, within the constraints of Agile team synchronization.

• Collaboration Tools: Expect heavy reliance on communication and collaboration tools such as Slack, Microsoft Teams, Zoom, Jira, Confluence, and Git-based platforms (GitHub, GitLab, Bitbucket).

• Technology Stack: Access to modern development tools, IDEs, and cloud-based environments for building and testing applications.

• Team Interaction: Regular virtual meetings, code reviews, and pair programming sessions will be key for team interaction and knowledge sharing.

Work Schedule: While the role is fully remote, standard full-time working hours (approximately 40 per week) are expected. Flexibility in daily scheduling might be possible, but synchronous collaboration during core business hours (likely overlapping with European time zones) will be necessary for effective team participation and Agile processes.

📝 Enhancement Note: The fully remote aspect is a significant feature. Candidates should be prepared for a self-managed work environment and strong reliance on digital collaboration tools. Understanding the company's core operating hours and team sync requirements will be crucial.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Likely a brief call with Starfinder (the recruitment agency) to assess basic qualifications, experience, and

English proficiency.

• Technical Interview(s): Several rounds focusing on core UI development skills. This may include:

  • Live coding exercises (e.g., building a small component, solving a JavaScript problem).
  • Deep dives into React.js concepts, state management (Redux), and component architecture.
  • Discussions on build tools (Webpack), testing strategies (Jest/Enzyme), and API integrations.
  • Architectural design questions related to scalability, performance, and maintainability.

• Portfolio Review/Case Study: A dedicated session where the candidate presents 1-2 significant projects from their portfolio, explaining their role, technical challenges, solutions, and impact. This is where the "process documentation" aspects will be evaluated.

• Behavioral/Team Fit Interview: Assessing problem-solving approach, collaboration style, cultural fit, and alignment with Agile principles. This might involve hypothetical scenarios.

• Final Interview: Potentially with a senior engineering leader or hiring manager to discuss the role, growth opportunities, and make a final decision.

Portfolio Review Tips:

• Curate Selectively: Choose 2-3 projects that best showcase your senior-level skills in React, Redux, performance optimization, and complex UI challenges.

• Focus on Impact: For each project, clearly articulate the problem you solved, your specific contributions, the technologies used, and the measurable outcomes (e.g., performance improvements, user engagement metrics).

• Structure Your Presentation: Use a clear narrative: Project Overview -> Your Role & Responsibilities -> Technical Challenges -> Solutions Implemented -> Results & Impact -> Lessons Learned.

• Highlight Reusable Components: If you have examples of component libraries or design system contributions, emphasize their architecture, maintainability, and how they improved development efficiency.

• Be Prepared for Deep Dives: Anticipate detailed questions about your code, architectural decisions, and trade-offs made.

• Showcase Collaboration: If possible, demonstrate how you collaborated with designers and backend teams.

Challenge Preparation:

• Coding Challenges: Practice common JavaScript and React coding problems. Focus on clean code, efficiency, and clear explanations. Tools like LeetCode, HackerRank, and frontend-specific challenges can be useful.

• System Design: Be ready to discuss how you would design a scalable and performant UI architecture for an application like a peer-to-peer exchange. Consider aspects like state management, code splitting, lazy loading, and API communication patterns.

• Redux Deep Dive: Prepare to explain advanced Redux concepts, middleware (like Redux-Saga), immutability, and performance considerations.

• Agile Scenarios: Think about how you would handle common Agile situations, such as changing requirements mid-sprint, estimating tasks, or resolving technical disagreements within a team.

📝 Enhancement Note: The interview process is expected to be rigorous, typical for a senior technical role in a demanding industry. The portfolio review is a critical component, requiring candidates to demonstrate not just technical skills but also their ability to articulate complex technical concepts and project outcomes effectively.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Framework: React.js (core requirement)

• State Management: Redux, Redux-Saga,

Immutable.js

• Styling: CSS3 (SCSS Modules)

• JavaScript: ES6+ (async/await, generators)

• Build Tools: Webpack (optimization, code-splitting), potentially

Vite

• Linters/Formatters: ESLint,

Prettier

• Package Manager:

Yarn

• Version Control:

Git

Analytics & Reporting:

CRM & Automation:

Integration Tools:

• API REST: Essential for data fetching and interaction.

• WebSocket: For real-time communication.

Testing Tools:

• Unit & Component Testing: Jest, Enzyme, React Testing Library (preferred)

📝 Enhancement Note: The technology stack is heavily focused on the modern React ecosystem. Candidates must be proficient in the core libraries and tools mentioned. Experience with TypeScript and newer build tools like Vite are considered valuable additions.

👥 Team Culture & Values

Operations Values:

• Performance & Efficiency: A strong emphasis on building high-performing applications and optimizing development processes, given the scale and nature of the exchange platform.

• Collaboration & Teamwork: Working effectively in an Agile, cross-functional team is paramount. Open communication and mutual support are key.

• Innovation & Continuous Improvement: A culture that encourages exploring new technologies, adopting best practices, and continuously refining workflows (e.g., TypeScript migration, Vite adoption).

• Quality & Reliability: Delivering robust, well-tested, and stable code is critical for a financial platform where errors can have significant consequences.

• User-Centricity: A commitment to delivering the best possible User Experience (UX) for platform users.

Collaboration Style:

• Agile & Iterative: Expect frequent collaboration within a Scrum or Kanban framework, involving daily stand-ups, sprint planning, and regular feedback loops.

• Cross-Functional: Close working relationships with UI/UX Designers, Backend Developers, and potentially Product Managers.

• Open Communication: Encouragement of open dialogue, constructive feedback, and knowledge sharing through code reviews, pair programming, and team discussions.

• Design System Adherence & Influence: Working collaboratively to maintain and evolve a shared design system, ensuring consistency while also providing input for improvements.

📝 Enhancement Note: The culture is likely fast-paced, technically driven, and collaborative, typical of successful tech companies in the fintech space. The emphasis on Agile, performance, and quality is crucial for this type of business.

⚡ Challenges & Growth Opportunities

Challenges:

• High-Performance Demands: Building and maintaining UIs that are ultra-performant under heavy load and high transaction volumes.

• Scalability for Multi-Brand: Designing components and architecture that can effectively support multiple distinct brands or products within a single codebase.

• Complex State Management: Effectively managing intricate application states using Redux and related libraries in a large-scale application.

• Real-time Data Integration: Handling real-time data streams via WebSockets efficiently and reliably.

• Rapid Technological Evolution: Staying current with the fast-paced evolution of frontend technologies and deciding when and how to adopt new tools (e.g., TypeScript, Vite).

• Remote Collaboration: Ensuring effective communication and collaboration within a fully remote team across potentially different time zones.

Learning & Development Opportunities:

• Advanced React & Frontend Techniques: Deepen expertise in React 18+ features, performance profiling, and modern frontend patterns.

• TypeScript Mastery: Become proficient in TypeScript through the ongoing migration, enhancing code quality and maintainability.

• Fintech Domain Expertise: Gain in-depth knowledge of financial exchange platforms, trading mechanisms, security protocols, and regulatory considerations.

• Architectural Design: Develop skills in designing scalable, maintainable, and performant frontend architectures.

• Mentorship: Potential to mentor junior developers and contribute to technical decision-making processes.

• Exposure to Modern Tooling: Work with cutting-edge build tools like Vite and explore advanced CI/CD practices.

📝 Enhancement Note: The challenges are significant and directly tied to the demanding nature of the fintech exchange industry. The growth opportunities offer clear paths for technical advancement and specialization within a high-demand field.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI component you built using React and Redux. What were the main challenges, and how did you overcome them?" (Focus on architecture, state management, and problem-solving).

• "How would you approach optimizing the performance of a large-scale React application, especially one handling real-time data?" (Discuss Webpack, code-splitting, lazy loading, memoization, efficient state updates).

• "Imagine we need to integrate a new feature that requires real-time updates from a WebSocket. How would you design the frontend integration, including state management and error handling?" (Focus on WebSocket API, Redux integration, and resilience).

• "Walk us through your process for building and maintaining a shared component library. What are the key considerations for its adoption across multiple products?" (Discuss npm publishing, versioning, documentation, and design system alignment).

• "How do you ensure code quality and prevent regressions in a large frontend codebase?" (Discuss testing strategies: unit, component, integration; linting, code reviews).

Company & Culture Questions:

• "What interests you about working on a peer-to-peer exchange platform?" (Connect to interest in fintech, high-volume systems, or challenging technical problems).

• "How do you contribute to a positive and collaborative team environment, especially in a remote setting?" (Provide examples of proactive communication, knowledge sharing, and support).

• "How do you stay updated with the latest trends and best practices in frontend development?" (Mention blogs, conferences, online courses, community involvement).

Portfolio Presentation Strategy:

• Tell a Story: Frame each project as a narrative: the problem, your role, the challenges, the solution, and the impact.

• Quantify Success: Use metrics wherever possible (e.g., "Reduced load time by 30%", "Improved conversion rate by X%").

• Focus on Your Contribution: Clearly delineate what you specifically did, especially in team projects.

• Technical Depth: Be ready to explain the 'why' behind your technical decisions and discuss trade-offs.

• Design System Integration: If applicable, show how your work aligns with or contributes to a design system.

• Clean Code & Structure: Ensure any code snippets or demos are well-organized and easy to follow.

Challenge Preparation:

• Practice Live Coding: Use platforms like CoderPad, LeetCode, or HackerRank. Focus on explaining your thought process out loud.

• Redux Saga: Be prepared to explain how Redux-Saga works, its advantages, and common patterns.

• API Design Interaction: Understand how to interact with RESTful APIs and potentially GraphQL.

• Problem-Solving Scenarios: Think through how you would break down a complex problem into smaller, manageable parts.

📝 Enhancement Note: Preparation should focus on showcasing senior-level expertise, architectural thinking, and problem-solving skills, backed by concrete examples from past projects. The ability to articulate technical decisions and their impact is key.

📌 Application Steps

To apply for this operations position:

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

• Tailor Your Resume: Highlight your 6+ years of experience in UI development, specifically emphasizing your proficiency in React.js, Redux, state management, and your experience with the mentioned build tools and testing frameworks. Use keywords from the job description.

• Prepare Your Portfolio: Curate 2-3 of your strongest projects that demonstrate your skills in building high-performance, scalable UIs. Be ready to present them, focusing on your specific contributions, technical challenges, and measurable outcomes. Ensure your portfolio showcases experience with component libraries or design systems.

• Practice Interview Questions: Review the "Interview Preparation" section above and practice answering common technical, behavioral, and scenario-based questions, particularly those related to React, Redux, performance optimization, and remote collaboration.

• Research the Company: While Starfinder is the recruiter, try to understand the nature of the "important international technology player" they represent, particularly their focus on peer-to-peer exchange platforms, to tailor your interest and responses.

⚠️ 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.