Senior UI Developer (React JS)

📍 Job Overview

Job Title: Senior UI Developer (React JS)

Company: Vrinda International (for PhaseZero.ai)

Location: Bangalore, Karnataka, India

Job Type: Full-Time

Category: Software Engineering / Frontend Development

Date Posted: 2026-06-04

Experience Level: Senior (10+ years)

Remote Status: On-site

🚀 Role Summary

• Spearhead the development of cutting-edge user interfaces for a leading product-based client, PhaseZero.ai, utilizing advanced React JS frameworks.

• Architect and implement modern frontend solutions, emphasizing reusable components and robust architectural patterns to ensure scalability and maintainability.

• Drive the creation of high-performance, responsive web applications that meet stringent quality and user experience standards.

• Collaborate with cross-functional teams to translate complex business requirements into intuitive and efficient user experiences.

📝 Enhancement Note: While the primary job title is Senior UI Developer, the context of "product-based client" and the emphasis on scalability and performance suggest a role that bridges pure development with operational efficiency in the frontend space. This role is critical for ensuring the user-facing aspect of the product is robust, scalable, and contributes to overall user adoption and satisfaction, which are key GTM metrics.

📈 Primary Responsibilities

• Design, develop, and implement complex, scalable, and high-performance user interfaces using React JS, adhering to best practices and modern frontend architecture principles.

• Create and maintain a comprehensive library of reusable UI components to ensure consistency, accelerate development, and improve maintainability across the application.

• Collaborate closely with product managers, designers, and backend engineers to define feature requirements, translate wireframes and mockups into functional code, and ensure seamless integration.

• Optimize application performance for maximum speed and scalability, identifying and resolving bottlenecks in the frontend codebase.

• Conduct code reviews, provide constructive feedback to junior developers, and promote knowledge sharing within the frontend engineering team.

• Stay abreast of the latest industry trends, technologies, and best practices in React JS and frontend development, proactively suggesting improvements and innovations.

• Ensure the implementation of responsive design principles, guaranteeing a consistent and optimal user experience across various devices and screen sizes.

📝 Enhancement Note: The responsibilities emphasize not just coding but also architectural design, performance optimization, and collaboration, which are critical for senior roles in product development. For a UI Developer, "performance" and "scalability" directly impact the user experience, which is a key driver of customer acquisition and retention for GTM strategies.

🎓 Skills & Qualifications

Education:

• Bachelor's or Master's degree in Computer Science, Engineering, or a related field, or equivalent practical experience. Experience:

• 10–14 years of hands-on experience in professional UI development, with a significant focus on React JS.

• Proven track record of working within product-based companies, understanding the lifecycle of product development and iteration. Required Skills:

• React JS: Deep expertise in building complex applications with React, including hooks, context API, and state management (e.g., Redux, Zustand, Recoil).

• UI Development Expertise: Strong command over modern JavaScript (ES6+), HTML5, CSS3, and preprocessors like Sass/LESS.

• Frontend Architecture: Solid understanding of modern frontend architectural patterns, component-based design, and best practices for building scalable and maintainable applications.

• Performance Optimization: Experience in identifying and resolving performance bottlenecks, optimizing rendering, and ensuring fast load times for web applications.

• Responsive Design: Proficient in creating responsive UIs that adapt seamlessly to various devices and screen resolutions.

• Version Control: Proficiency with Git and collaborative development workflows.

Preferred Skills:

• Experience with Next.js or other React frameworks.

• Familiarity with UI testing frameworks (e.g., Jest, React Testing Library).

• Knowledge of build tools like Webpack or Vite.

• Understanding of CI/CD pipelines for frontend applications.

• Experience with TypeScript.

📝 Enhancement Note: The explicit requirement for experience in "Product-Based Companies" is a critical differentiator. This implies an understanding of product roadmaps, agile development cycles, and the direct impact of UI/UX on customer acquisition and retention, aligning closely with GTM objectives.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• React JS Project Showcase: A portfolio demonstrating complex, scalable, and high-performance web applications built with React JS. Highlight the architectural approach, component reusability, and state management strategies employed.

• Performance Optimization Case Studies: Examples of how you identified and resolved performance issues, showcasing quantifiable improvements in load times, rendering speed, or resource utilization.

• Responsive Design Examples: Demonstrations of UIs that adapt effectively across a range of devices, from mobile to desktop, highlighting your approach to cross-browser compatibility and accessibility.

• Contribution to Product Development: Evidence of involvement in the full product development lifecycle, from initial concept to deployment and iteration, ideally within a product-based company context.

Process Documentation:

• Component Development Workflow: Documented processes for creating, testing, and deploying reusable UI components, including versioning and documentation standards.

• Performance Analysis Methodology: A clear outline of your systematic approach to diagnosing and resolving frontend performance bottlenecks.

• Cross-Functional Collaboration Protocols: Examples of how you've documented and communicated technical requirements and solutions to non-technical stakeholders (e.g., Product Managers, Designers).

📝 Enhancement Note: For a senior UI Developer role, a portfolio is paramount. It should not just showcase finished products but also the underlying processes, architectural decisions, and optimization strategies. This demonstrates a senior-level understanding of development efficiency and product impact, crucial for GTM success.

💵 Compensation & Benefits

Salary Range:

• The stated CTC is "Up to 33 LPA" (Lakhs Per Annum). For a Senior UI Developer with 10-14 years of experience in Bangalore, India, this is a competitive range for a product-based company. The actual salary will depend on the candidate's specific experience, skill set, and performance during the interview process. A typical range for this profile in Bangalore could be INR 25 LPA to INR 33 LPA. Benefits:

• Competitive Salary: As indicated, up to 33 LPA, reflecting the senior level and specialized skills required.

• Health Insurance: Comprehensive medical coverage for employees and potentially dependents.

• Paid Time Off: Generous vacation, sick leave, and public holidays.

• Professional Development: Opportunities for training, certifications, and attending industry conferences.

• Retirement Savings Plan: Contributions to provident fund or similar retirement schemes.

• Performance Bonuses: Potential for annual bonuses based on individual and company performance.

• Employee Assistance Programs: Support services for personal and professional well-being.

Working Hours:

• Standard full-time working hours are typically 40 hours per week. Given the role is on-site in Bangalore, expect a typical 5-day work week, Monday to Friday. Flexibility may be offered based on team needs and project deadlines.

📝 Enhancement Note: The salary range provided (up to 33 LPA) is significant for a Senior UI Developer in India. This suggests that PhaseZero.ai (the client) is a well-funded or highly successful product company, likely with strong GTM strategies and the financial capacity to attract top talent. The benefits are standard for a senior role in a product company.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Software Development (Product-Based)

Company Size: Vrinda International is acting as a recruitment partner for PhaseZero.ai. PhaseZero.ai is a product-based company, likely with a significant engineering team given the need for a Senior UI Developer with 10-14 years of experience. Product-based companies often foster a culture of innovation, ownership, and direct impact on the end product.

Founded: The founding date of PhaseZero.ai is not provided, but the hiring of a senior role suggests a mature product and established operations.

Team Structure:

• Frontend Engineering Team: The Senior UI Developer will likely be part of a dedicated frontend team, possibly comprising other UI developers, a frontend lead, and potentially UI/UX designers.

• Reporting Structure: Typically, a Senior UI Developer reports to a Frontend Lead, Engineering Manager, or Director of Engineering.

• Cross-Functional Collaboration: Will work closely with Product Managers, Backend Engineers, QA Engineers, and UI/UX Designers to deliver features.

Methodology:

• Agile Development: Product-based companies commonly use Agile methodologies (Scrum, Kanban) for iterative development, rapid feedback, and efficient delivery.

• Data-Driven Design: Emphasis on using user data, A/B testing, and analytics to inform UI/UX decisions and drive product improvements.

• Focus on User Experience: A core tenet of product companies is delivering exceptional user experiences to drive adoption, retention, and customer satisfaction, directly impacting GTM success.

Company Website: www.Vrinda-International.com (recruitment partner); PhaseZero.ai (client, inferred)

📝 Enhancement Note: The emphasis on a "product-based client" is crucial. This implies a focus on long-term product vision, user engagement, and market competitiveness, all of which are core to GTM strategy. The culture is likely to be performance-oriented, with a strong emphasis on innovation and delivering high-quality user-facing features.

📈 Career & Growth Analysis

Operations Career Level: Senior Developer / Technical Lead. This role represents a significant step in a frontend development career, moving beyond individual contribution to influencing architectural decisions, mentoring junior staff, and potentially leading small teams or specific feature areas.

Reporting Structure: The Senior UI Developer will likely report to an Engineering Manager or a Lead Frontend Engineer. They will also mentor and guide junior developers within the frontend team, contributing to their growth and skill development.

Operations Impact: This role's impact is directly tied to the user experience and performance of the product. A well-designed, high-performing UI is critical for customer acquisition, user engagement, conversion rates, and overall customer satisfaction – all key metrics for GTM success. Poor UI can lead to high churn rates and hinder market penetration.

Growth Opportunities:

• Technical Leadership: Opportunity to transition into a Tech Lead or Architect role, taking ownership of larger feature sets or system-wide frontend architecture.

• Mentorship & Management: Potential to move into a management track, leading a team of frontend developers, focusing on people management and strategic direction.

• Specialization: Deepen expertise in specific areas like performance engineering, accessibility, or frontend tooling and infrastructure.

• Cross-Functional Expertise: Gain deeper insights into product management, design thinking, and backend systems through close collaboration.

📝 Enhancement Note: The growth path for a Senior UI Developer in a product company is typically towards technical leadership or management. Their impact on GTM is significant, as they are directly responsible for the product's front-facing appeal and usability, which are primary drivers of customer adoption and satisfaction.

🌐 Work Environment

Office Type: On-site in Bangalore. This suggests a traditional office environment conducive to collaboration, team building, and direct communication.

Office Location(s): Bangalore, Karnataka, India. This is a major tech hub, offering access to a large talent pool and a vibrant tech ecosystem.

Workspace Context:

• Collaborative Environment: Expect an office setup that encourages interaction between developers, designers, and product teams. This could include open-plan areas, meeting rooms, and dedicated collaboration spaces.

• Tools & Technology: Access to modern development hardware, software licenses, and potentially specialized tools for UI/UX design and performance analysis.

• Team Interaction: Regular team meetings, stand-ups, and brainstorming sessions to foster a cohesive and productive working environment.

Work Schedule:

• Typically a 5-day work week (Monday-Friday) with standard office hours (e.g., 9 AM to 6 PM IST). Some flexibility may be available, but the on-site nature implies a commitment to being present in the office.

📝 Enhancement Note: The on-site requirement in Bangalore suggests a company that values in-person collaboration and team cohesion, which can be beneficial for complex UI development projects requiring constant communication and feedback loops.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: HR/Recruiter call to assess basic qualifications, experience, salary expectations, and cultural fit.

• Technical Assessment (Online/Take-home): A coding challenge or a small project designed to evaluate React JS proficiency, problem-solving skills, and coding practices. This might involve building a small component or feature.

• Technical Interview(s) (On-site/Video): In-depth discussions covering React JS concepts, frontend architecture, JavaScript, HTML/CSS, performance optimization, and potentially system design questions related to frontend architecture. Expect whiteboard coding or live coding sessions.

• Portfolio Review: A dedicated session where the candidate presents their portfolio, discusses key projects, architectural decisions, challenges faced, and solutions implemented. This is crucial for demonstrating impact and senior-level thinking.

• Hiring Manager/Team Lead Interview: Focus on behavioral questions, leadership potential, team collaboration, and alignment with company culture and values.

• Final Round: Often with senior leadership or a Director of Engineering, focusing on strategic thinking and overall fit.

Portfolio Review Tips:

• Focus on Impact: For each project, clearly articulate the problem it solved, your specific role, the technologies used, and the quantifiable outcomes (e.g., improved performance by X%, increased user engagement by Y%).

• Showcase React Expertise: Highlight complex React features used, architectural patterns implemented (e.g., component composition, state management strategies), and how you ensured code reusability and maintainability.

• Demonstrate Problem-Solving: Be prepared to discuss challenges encountered during development (technical, team-related, or product-related) and how you overcame them.

• Explain Architectural Decisions: Clearly articulate why you made certain architectural choices, discussing trade-offs and alternatives considered.

• Tailor to the Role: Emphasize projects that align with building scalable, high-performance, responsive web applications.

Challenge Preparation:

• React Fundamentals: Brush up on core React concepts, hooks, state management, lifecycle methods, context API, and performance optimization techniques (e.g., memoization, lazy loading).

• JavaScript: Ensure a strong grasp of modern JavaScript (ES6+), including async/await, promises, closures, and data structures.

• HTML/CSS: Review semantic HTML, CSS specificity, layout techniques (Flexbox, Grid), and responsive design patterns.

• Problem-Solving Scenarios: Practice common coding interview problems, especially those related to algorithms, data structures, and UI manipulation.

• Company Research: Understand PhaseZero.ai's product, target market, and any publicly available information about their technology stack or company culture.

📝 Enhancement Note: The emphasis on a portfolio review and technical assessments highlights the company's focus on practical skills and problem-solving capabilities. For a Senior UI Developer, demonstrating the ability to architect robust solutions and optimize performance is as important as writing clean code.

🛠 Tools & Technology Stack

Primary Tools:

• React JS: The core library for building user interfaces.

• JavaScript (ES6+): The primary programming language.

• HTML5 & CSS3: For structuring and styling web content.

• Version Control (Git): Essential for collaborative development.

• Build Tools: Likely Webpack, Vite, or similar for bundling and optimizing frontend assets.

• Package Managers: npm or Yarn for managing project dependencies.

Analytics & Reporting:

• Browser Developer Tools: For debugging, performance profiling, and network analysis.

• Analytics Platforms: Potentially Google Analytics, Mixpanel, Amplitude, or similar, to understand user behavior and product engagement.

• Performance Monitoring Tools: Tools like Lighthouse, WebPageTest, or internal APM solutions for tracking application performance.

CRM & Automation:

• While not directly managing CRM, understanding how frontend applications integrate with backend systems (which may involve CRM data) is beneficial.

• CI/CD Tools: Familiarity with Jenkins, GitLab CI, GitHub Actions, or similar for automated builds, testing, and deployments.

📝 Enhancement Note: The tools listed are standard for modern frontend development. Proficiency in React JS, JavaScript, HTML, CSS, and Git is non-negotiable. Experience with performance monitoring and analytics tools is highly valued for a senior role focused on product performance and user engagement.

👥 Team Culture & Values

Operations Values:

• Innovation: A drive to explore new technologies and approaches to build cutting-edge user interfaces.

• Quality & Excellence: A commitment to delivering high-quality, robust, and performant code that meets stringent standards.

• Collaboration: A belief in teamwork and open communication to achieve shared goals, working effectively with cross-functional teams.

• User-Centricity: A focus on understanding user needs and delivering intuitive, engaging, and accessible experiences.

• Ownership & Accountability: Taking responsibility for one's work, from development through to deployment and ongoing maintenance.

Collaboration Style:

• Agile & Iterative: Working in sprints, with regular feedback loops and adaptability to changing requirements.

• Transparent Communication: Open sharing of progress, challenges, and ideas within the team and with stakeholders.

• Constructive Feedback: Willingness to give and receive feedback to foster continuous improvement and learning.

• Cross-Functional Integration: Seamless collaboration with Product, Design, and Backend teams to ensure alignment and efficient delivery.

📝 Enhancement Note: The emphasis on user-centricity, quality, and collaboration aligns with the goals of a successful product company that aims to capture and retain market share through superior user experience.

⚡ Challenges & Growth Opportunities

Challenges:

• Scaling Complex UIs: Developing and maintaining large-scale React applications while ensuring performance, maintainability, and a consistent developer experience.

• Keeping Pace with Technology: The frontend landscape evolves rapidly; staying current with new libraries, frameworks, and best practices requires continuous learning.

• Balancing Innovation and Stability: Introducing new features and technologies while ensuring the stability and reliability of the existing product.

• Cross-Team Dependencies: Navigating dependencies with backend teams and ensuring smooth integration of frontend and backend components.

Learning & Development Opportunities:

• Advanced React Techniques: Deep dives into performance optimization, advanced state management, and architectural patterns.

• New Frameworks/Libraries: Opportunities to explore and implement technologies like Next.js, GraphQL, or advanced styling solutions.

• Leadership Training: Development programs focused on technical leadership, mentoring, and project management.

• Industry Conferences: Attending major frontend or tech conferences to gain insights into emerging trends and network with peers.

📝 Enhancement Note: The challenges mentioned are inherent to senior-level development roles in fast-paced product environments. The growth opportunities reflect a commitment to continuous learning and career advancement within a technology-focused organization.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI you've built with React. What were the key architectural decisions, and what challenges did you face in ensuring scalability and performance?" (Focus on your process, trade-offs, and quantifiable results.)

• "How do you approach building reusable components? What are the benefits and potential drawbacks of a component-based architecture for a large application?" (Demonstrate understanding of modularity, maintainability, and potential over-engineering.)

• "Imagine a scenario where user feedback indicates slow loading times for a critical feature. How would you diagnose and resolve this issue?" (Detail your debugging process, tools used, and optimization strategies.) Company & Culture Questions:

• "Why are you interested in working for a product-based company like PhaseZero.ai, and how does your experience align with our focus on innovation and user experience?" (Research PhaseZero.ai's product and market position.)

• "Describe your experience working in an Agile development environment. How do you handle changing requirements or tight deadlines?" (Showcase adaptability and collaboration.)

• "How do you ensure the quality and maintainability of your code, especially in a collaborative team setting?" (Discuss code reviews, testing strategies, and documentation.) Portfolio Presentation Strategy:

• Storytelling: For each project, tell a compelling story: the problem, your solution, your role, the impact, and what you learned.

• Highlight Key Technologies: Explicitly mention your use of React JS, state management, and any other relevant frontend technologies.

• Quantify Achievements: Use numbers and data whenever possible to demonstrate the impact of your work (e.g., "reduced load time by 30%," "increased conversion rate by 5%").

• Technical Depth: Be prepared to dive deep into the technical details of your projects, explaining architectural choices and trade-offs.

• Conciseness: Respect the interviewer's time; present your most impactful projects efficiently.

📝 Enhancement Note: Preparing for these types of questions will require the candidate to connect their technical skills directly to business outcomes and product success, which is central to GTM objectives.

📌 Application Steps

To apply for this operations position:

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

• Tailor Your Resume: Highlight your 10-14 years of experience, specifically emphasizing React JS expertise, UI development, frontend architecture, and experience with product-based companies. Use keywords from the job description.

• Curate Your Portfolio: Select 2-3 of your most impactful React JS projects. Ensure they clearly demonstrate your ability to build scalable, high-performance, and responsive applications. Prepare to walk through the architecture, challenges, and outcomes.

• Prepare for Technical Challenges: Practice React coding exercises and be ready to discuss common frontend concepts and performance optimization strategies.

• Research PhaseZero.ai: Understand their product, target market, and any available information on their technology and culture to articulate your interest and fit.

⚠️ 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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