React UI Senior Software Development Engineer

📍 Job Overview

Job Title: React UI Senior Software Development Engineer

Company: CSG

Location: Brazil Remote

Job Type: FULL_TIME

Category: Software Engineering / Front-End Development

Date Posted: May 20, 2026

Experience Level: 5-10 years

Remote Status: Fully Remote

🚀 Role Summary

• Design, develop, and implement scalable and high-performance front-end user interfaces using React and modern JavaScript frameworks.

• Collaborate with cross-functional teams, including product managers, designers, and back-end engineers, to deliver robust software solutions for CSG’s cloud-based digital BSS Ascendon Platform.

• Drive the adoption of industry best practices in Agile methodologies, test automation, Continuous Integration (CI), and Continuous Deployment (CD).

• Contribute to the entire software development lifecycle, from requirements gathering and technical design to implementation, testing, and deployment, with a strong emphasis on code quality and reusability.

📝 Enhancement Note: Although the title is "React UI Senior Software Development Engineer," the responsibilities and required skills indicate a strong focus on front-end development within a broader software engineering context. The role involves developing features for specific platforms (Ascendon or Singleview) and requires deep expertise in JavaScript, modern web frameworks, and comprehensive testing strategies. The mention of "Ascendon R&D" and "cloud based digital BSS Ascendon Platform" suggests this role is critical for the company's core product offerings.

📈 Primary Responsibilities

• Develop and maintain responsive, user-friendly, and performant UI components and applications using React, JavaScript (ES6+), HTML5, and CSS3.

• Collaborate with product owners and UX/UI designers to translate complex requirements and mockups into high-quality, production-ready code.

• Implement and champion automated testing strategies, including unit, integration, and end-to-end tests, to ensure application stability and facilitate continuous delivery.

• Participate actively in Agile ceremonies (Scrum/Kanban/SAFe) such as sprint planning, daily stand-ups, sprint reviews, and retrospectives, contributing to team velocity and product quality.

• Write clean, maintainable, and well-documented code, adhering to established coding standards and best practices for large-scale web UI applications.

• Troubleshoot, debug, and upgrade existing software components, identifying and resolving performance bottlenecks and technical debt.

• Contribute to the design and architecture of new features, ensuring scalability, security, and maintainability of the front-end codebase.

• Proactively identify opportunities for process and technology improvements within the development lifecycle, focusing on efficiency and automation.

• Engage in code reviews, providing constructive feedback to peers and incorporating feedback received to enhance code quality and team knowledge.

• Stay current with emerging front-end technologies and industry trends, evaluating their potential application to improve CSG's product offerings.

📝 Enhancement Note: The raw description emphasizes automation of manual tests and identifying automatable test cases. This suggests a strong need for a candidate who not only writes tests but also actively looks for opportunities to expand test coverage and efficiency, a key trait for senior engineers in modern development environments.

🎓 Skills & Qualifications

Education: Bachelor’s Degree in Computer Science, Computer Engineering, or a related technical field.

Experience: 5+ years of professional programming experience with a strong focus on front-end development and modern web technologies.

Required Skills:

• Advanced proficiency in JavaScript (ES6+), HTML5, and CSS3, with a deep understanding of cross-browser compatibility and web standards.

• 3+ years of hands-on experience with modern JavaScript frameworks, with a strong preference for React. Experience with Angular, Angular JS, Vue.js, or Ember is also valued.

• Proven experience in structuring and developing large-scale, complex web UI applications.

• 3+ years of experience with unit testing frameworks such as Mocha, Karma, and Jasmine.

• Familiarity with modern JavaScript build environments and package managers, including Webpack, Yarn, and NPM.

• Experience implementing high-performance, reusable code for UI components.

• Demonstrated experience in test automation, including unit and integration tests.

• Proficiency with automated end-to-end testing frameworks like Cypress, Protractor, or TestCafe.

• Strong analytical and problem-solving skills, with the ability to gather and analyze information to develop effective solutions.

• Excellent communication skills, both verbal and written, for effective collaboration within a global development team.

• Self-motivated and able to work effectively in a global, distributed team environment.

Preferred Skills:

• Exposure to Behavior Driven Development (BDD) or Acceptance Test Driven Development (ATDD) methodologies.

• Experience with SAFe, Scrum, or Kanban methodologies.

• Familiarity with CI/CD pipelines and practices.

• Experience with cloud-based platforms and digital BSS systems.

📝 Enhancement Note: The requirement for "5+ years programming in JavaScript/ES6, HTML, CSS and cross-browser development" and "3+ year of experience with modern web frameworks" clearly positions this as a senior-level role. The breadth of frameworks listed (React, Angular, Vue.js, Ember) indicates a need for adaptability and a strong understanding of front-end architecture principles, not just proficiency in one specific framework. The explicit mention of "Advanced experience with Chrome Developer Tools" is a key indicator of the expected depth of debugging and performance tuning skills.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of complex React UI applications demonstrating proficiency in component-based architecture, state management, and performance optimization.

• Examples of reusable UI components and libraries developed for large-scale projects.

• Case studies highlighting contributions to test automation strategies, including unit, integration, and end-to-end test implementation.

• Documentation or examples of experience with JavaScript build tools (Webpack, NPM, Yarn) and their role in optimizing front-end workflows.

Process Documentation:

• Evidence of developing and maintaining automated test suites for web applications, illustrating the process from test case identification to automation and reporting.

• Examples of contribution to CI/CD pipelines, demonstrating understanding of automated build, test, and deployment processes.

• Documentation of problem-solving approaches for complex UI challenges, including debugging, performance tuning, and cross-browser compatibility issues.

• Records of participating in code reviews, contributing to architectural discussions, and adhering to coding standards.

📝 Enhancement Note: For a senior role focused on UI development and automation, a portfolio should emphasize not just the final product but the process and impact. This includes showcasing how they’ve improved development workflows, test coverage, and component reusability. Demonstrating experience with tools like Webpack and testing frameworks like Cypress is crucial.

💵 Compensation & Benefits

Salary Range: Estimated R$ 10,000 - R$ 18,000 per month (CLT Model).

Explanation of Estimate: Based on market research for Senior Software Development Engineers with 5-10 years of experience specializing in React and front-end development in Brazil, particularly for remote positions. This range accounts for the CLT (Consolidação das Leis do Trabalho) model, which includes standard employee benefits and contributions. The upper end reflects extensive experience, strong proficiency in all listed technologies, and proven leadership/mentorship capabilities.

Benefits:

• Sulamerica Health Insurance: Comprehensive medical coverage.

• Sulamerica Dental Insurance: Dental care benefits.

• Vidalink: Potentially an Employee Assistance Program (EAP) or health support service.

• Food/Meal Voucher: Financial assistance for meals.

• Child Care Assistance: Support for employees with children.

• Day off on Birthday: A personal day to celebrate birthdays.

• Gympass: Access to a wide network of fitness facilities.

• Language Assistance: Support for language learning or professional development.

• Digital Course Platform: Access to online learning resources for continuous skill development.

• Volunteer Time Off: 2 days per year dedicated to volunteer work.

Working Hours: Standard 40 hours per week, aligning with typical full-time employment in Brazil. Flexibility may be offered within the CLT framework, subject to team and project needs, particularly given the remote nature of the role.

📝 Enhancement Note: The job explicitly mentions a "CLT contract Model." This is crucial for candidates in Brazil as it dictates employment terms, benefits, and legal standing. The salary estimate is based on common ranges for senior developers in Brazil, factoring in remote work and the CLT structure. The benefits listed are typical for mid-to-large-sized tech companies operating in Brazil.

🎯 Team & Company Context

🏢 Company Culture

Industry: Software & Technology, specifically Business Support Systems (BSS) and Digital Transformation solutions for telecommunications, media, and entertainment sectors.

Company Size: CSG is a large enterprise, indicated by the range of employees and global presence, suggesting established processes but also opportunities for impact within specific R&D teams.

Founded: CSG has a long history, founded over 40 years ago, implying stability, deep industry knowledge, and a mature approach to business and technology.

Team Structure:

• The role is part of the Ascendon R&D team, focused on developing new features for CSG’s cloud-based digital BSS Ascendon Platform or core Singleview.

• This team operates within a global structure, collaborating with CSG delivery teams in locations such as Chicago, Denver, Omaha, Bangalore, and Brisbane.

Methodology:

• Agile Development: The team utilizes Agile methodologies like SAFe, Scrum, or Kanban, emphasizing iterative development, collaboration, and continuous feedback.

• DevOps Practices: A strong focus on Continuous Integration (CI) and Continuous Deployment (CD) is expected, leveraging automation for builds, testing, and deployments.

• Test-Driven Development (TDD) / Behavior-Driven Development (BDD): Exposure to or experience with these methodologies is beneficial, indicating a commitment to quality and robust testing.

• Data-Driven Improvement: While not explicitly stated for this role, CSG's overall culture emphasizes using data to empower others and make informed decisions, which likely extends to development processes.

Company Website: https://www.csgonline.org/

📝 Enhancement Note: CSG's description highlights "Impact," "Integrity," and "Inspiration" as guiding principles. For an operations-focused role, this translates to a culture that values proactive problem-solving, ethical conduct, and innovative thinking. The emphasis on empowering others suggests a collaborative and supportive environment. The company's long history indicates a stable employer with a deep understanding of its market.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior Software Development Engineer role, indicating a mid-to-senior career stage. It requires not only strong technical skills but also the ability to mentor junior developers, contribute to technical strategy, and drive best practices within the team. The focus on automation and complex problem-solving suggests an expectation of independent work and significant contributions.

Reporting Structure: The role reports into the Ascendon R&D team, likely under an Engineering Manager or Lead Architect. Collaboration will be with a global team, requiring strong remote communication skills.

Operations Impact: The engineer will directly impact the functionality, performance, and user experience of CSG’s core Ascendon Platform and Singleview solutions. This means their work has a direct bearing on CSG's ability to deliver value to its clients in the telecommunications, media, and entertainment industries. High-quality UI development and robust testing contribute to customer satisfaction, platform stability, and the company's competitive edge.

Growth Opportunities:

• Technical Specialization: Deepen expertise in React, front-end architecture, performance optimization, and advanced testing techniques.

• Leadership Development: Opportunities to mentor junior engineers, lead feature development initiatives, and influence technical direction within the R&D team.

• Cross-functional Exposure: Gain exposure to different aspects of the BSS platform and collaborate with teams across various global locations, broadening understanding of the business and technology landscape.

• Learning & Development: Access to CSG's digital course platform and potential for industry certifications or conference attendance to stay current with emerging technologies.

• Career Progression: Potential paths into Lead Engineer, Architect, or Engineering Management roles within CSG's R&D organization.

📝 Enhancement Note: As a "Senior" role, the expectation is for the candidate to be a self-starter, capable of problem-solving independently and potentially guiding others. The global nature of the teams means opportunities for exposure to diverse technical challenges and cross-cultural collaboration.

🌐 Work Environment

Office Type: This is a fully remote position within Brazil, offering flexibility and the ability to work from home.

Office Location(s): While the role is remote, CSG has offices in various locations globally, including Brazil (implied by the remote location being Brazil). Candidates are expected to be based in Brazil.

Workspace Context:

• Remote Collaboration: The work environment is heavily reliant on digital collaboration tools (e.g., Slack, Teams, Jira, Confluence) for communication, task management, and knowledge sharing.

• Agile Team Dynamics: Expect a fast-paced, agile environment where teamwork, open communication, and adaptability are key.

• Technology Stack: Access to modern development tools, cloud infrastructure, and internal systems necessary for developing and deploying software.

Work Schedule: The standard working hours are 40 hours per week. Given the global team distribution, there might be a need for some flexibility to accommodate meetings or collaboration across different time zones, though core working hours are likely aligned with Brazilian business hours.

📝 Enhancement Note: The remote nature of the role requires strong self-discipline and excellent digital communication skills. The company's global presence means opportunities to interact with diverse teams, but also potential for asynchronous communication challenges.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A recruiter (like Arison Ferreira) will likely conduct an initial call to assess basic qualifications, experience, and cultural fit.

• Technical Assessment: Expect a technical interview, which may include coding challenges (live coding, take-home assignment), discussions about JavaScript, React, testing methodologies, and problem-solving scenarios. This is where your portfolio will be reviewed.

• System Design/Architecture Discussion: For a senior role, there might be a session focused on architectural design, discussing how to build scalable, maintainable UI applications, and tackle complex technical problems.

• Team/Manager Interview: An interview with the hiring manager and potential team members to further assess technical depth, collaboration style, and alignment with team values.

• Final Interview: Potentially a final round with senior leadership or stakeholders.

Portfolio Review Tips:

• Highlight React Expertise: Showcase complex, well-structured React applications. Emphasize state management solutions (e.g., Redux, Context API), component design patterns, and performance optimization techniques.

• Demonstrate Testing Proficiency: Include examples of comprehensive unit, integration, and end-to-end tests. Detail your approach to test automation, showing how you've improved code quality and reduced bugs. Use frameworks like Mocha, Karma, Jasmine, Cypress, or Protractor.

• Showcase Reusable Components: Present examples of UI components you've built that are reusable, maintainable, and follow best practices for large-scale applications.

• Explain Your Process: For each portfolio item, explain your role, the problem you solved, the technologies used, and the impact of your work (e.g., improved performance, reduced development time, increased test coverage).

• Highlight Automation Contributions: If possible, document instances where you automated manual tests or contributed to CI/CD pipelines.

• Tailor to CSG: Briefly research CSG's products (Ascendon, Singleview) and try to relate your experience or showcase projects that demonstrate similar complexities if applicable.

Challenge Preparation:

• Coding Challenges: Practice common JavaScript and React coding problems. Focus on algorithmic thinking, data structures, and efficient code writing. Be prepared for questions on asynchronous JavaScript.

• Testing Scenarios: Think about how you would test different UI components and features. Be ready to discuss trade-offs between different types of tests and automation strategies.

• Problem-Solving: Prepare to discuss how you approach complex technical problems, break them down, and arrive at solutions. Use the STAR method (Situation, Task, Action, Result) to structure your answers.

• Agile & Collaboration: Be ready to discuss your experience with Agile methodologies and how you collaborate effectively in a global team environment.

📝 Enhancement Note: The emphasis on "test automation" and "automating manual test cases" suggests that candidates should be prepared to discuss their practical experience in this area, not just theoretical knowledge. Demonstrating initiative in improving testing processes will be highly valued.

🛠 Tools & Technology Stack

Primary Tools:

• Core Framework: React.js

• Programming Languages: JavaScript (ES6+), HTML5, CSS3

• Build Tools: Webpack, Gulp, Grunt, Yarn, NPM

• Testing Frameworks (Unit): Mocha, Karma, Jasmine

• Testing Frameworks (E2E): Cypress, Protractor, TestCafe

• Cross-Browser Development Tools: Chrome Developer Tools (advanced usage)

Analytics & Reporting:

CRM & Automation:

• Not directly applicable to this front-end role, but understanding how UI integrates with back-end systems (potentially CRM-like functionalities within BSS) is beneficial.

📝 Enhancement Note: The extensive list of required testing and build tools indicates that proficiency in these areas is not just a plus but a core requirement for this role. Candidates should be prepared to discuss their experience and comfort level with each.

👥 Team Culture & Values

Operations Values:

• Impact: A commitment to empowering colleagues and customers through effective software solutions. This translates to building reliable, user-friendly interfaces that solve real business problems.

• Integrity: Performing work ethically and authentically, treating colleagues and customers with trust and respect. This means writing honest code, admitting mistakes, and collaborating transparently.

• Inspiration: Encouraging bold thinking, passionate work, and innovation without fear of failure. This suggests an environment where engineers are encouraged to propose new ideas and experiment with solutions.

• Collaboration: Working effectively within a global team, sharing knowledge, and contributing to a supportive environment.

• Efficiency & Automation: A strong emphasis on streamlining processes, automating repetitive tasks (especially testing), and optimizing development workflows.

Collaboration Style:

• Agile & Iterative: Collaboration will happen within an Agile framework, involving regular communication, feedback loops, and iterative development.

• Global Teamwork: Expect to collaborate with team members across different time zones and cultures, requiring clear, concise communication and mutual respect.

• Cross-functional: Working closely with product managers, designers, and back-end engineers to ensure seamless integration and a cohesive product experience.

• Code Review Culture: Active participation in code reviews, both giving and receiving feedback, to maintain high code quality and share knowledge.

📝 Enhancement Note: CSG's guiding principles ("Impact," "Integrity," "Inspiration") are directly applicable to a senior engineering role. Candidates should be prepared to articulate how their work and approach align with these values, particularly in how they contribute to team success and product excellence.

⚡ Challenges & Growth Opportunities

Challenges:

• Complex UI Development: Building and maintaining sophisticated user interfaces for enterprise-level BSS platforms, requiring careful attention to detail, performance, and scalability.

• Global Team Collaboration: Effectively communicating and collaborating with team members across different time zones and cultural backgrounds.

• Keeping Pace with Technology: The front-end landscape evolves rapidly; staying current with best practices, new libraries, and tools while maintaining existing systems is a continuous challenge.

• Driving Automation Adoption: Championing and expanding test automation efforts within the team to improve efficiency and reliability.

• Legacy System Integration: Potentially working with or integrating with older systems while developing new features for modern platforms.

Learning & Development Opportunities:

• Advanced React & Front-end Architecture: Opportunities to deepen expertise in complex React patterns, state management, performance tuning, and modern front-end architectural principles.

• CI/CD & DevOps: Gaining practical experience and potentially certifications in Continuous Integration and Continuous Deployment pipelines.

• Mentorship & Leadership: Developing leadership skills by mentoring junior engineers and potentially leading specific development initiatives.

• Industry Knowledge: Learning about the BSS domain (telecommunications, media, entertainment) and how CSG's platforms serve these industries.

• Cross-Team Collaboration: Broadening understanding of software development lifecycles and challenges by working with diverse global teams.

📝 Enhancement Note: The challenges presented are typical for senior engineers in established tech companies. The growth opportunities are geared towards both technical deepening and career progression into leadership roles, aligning with a senior position.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex UI challenge you faced in a large-scale React application and how you solved it. What was the impact?" (Focus on problem-solving, technical depth, and quantifiable results).

• "How do you approach test automation for a new feature? What types of tests do you prioritize and why?" (Assess understanding of testing strategies, frameworks, and automation benefits).

• "Walk us through your experience with build tools like Webpack. How have you used them to optimize front-end performance?" (Evaluate practical knowledge of the toolchain).

• "How do you ensure code quality and reusability in a team environment? Discuss your experience with code reviews and component libraries." (Assess adherence to best practices and collaboration).

Company & Culture Questions:

• "How do CSG's guiding principles of Impact, Integrity, and Inspiration resonate with your own work ethic?" (Prepare examples demonstrating these values).

• "How do you contribute to a positive and collaborative team environment, especially in a remote, global setting?" (Focus on communication, proactivity, and teamwork).

Portfolio Presentation Strategy:

• Structure Your Narrative: For each project, clearly state the problem, your specific role/contribution, the technologies used, the challenges overcome, and the measurable outcomes (e.g., performance improvements, bug reduction, increased test coverage).

• Demo Key Features: If possible, have live demos or interactive prototypes ready for your most impactful projects.

• Highlight Automation: Specifically point out instances where you implemented or improved test automation, build processes, or CI/CD integration. Show the code or test results if feasible.

• Be Ready for Deep Dives: Expect interviewers to ask detailed questions about your code, architectural decisions, and problem-solving approaches within your portfolio projects.

• Quantify Your Impact: Use metrics whenever possible (e.g., "reduced load time by 30%", "increased test coverage from 60% to 90%", "streamlined deployment process").

📝 Enhancement Note: The emphasis on "automating manual test cases" and "identifying test cases that are automatable" means interviewers will likely probe deeply into your proactive approach to testing and efficiency. Be prepared to discuss specific examples of how you've identified such opportunities and implemented solutions.

📌 Application Steps

To apply for this React UI Senior Software Development Engineer position:

• Submit your resume and any relevant portfolio links through the CSG Careers portal.

• Tailor your Resume: Highlight your extensive experience with JavaScript, React, HTML, CSS, and modern web frameworks. Emphasize your proficiency in unit testing, integration testing, and end-to-end test automation using frameworks like Mocha, Karma, Jasmine, Cypress, or Protractor. Quantify achievements wherever possible.

• Prepare Your Portfolio: Curate a selection of your strongest projects that showcase complex React UI development, reusable component design, and robust test automation strategies. Ensure you can articulate your contributions and the impact of your work clearly.

• Research CSG: Familiarize yourself with CSG's history, its guiding principles (Impact, Integrity, Inspiration), and its primary product offerings like the Ascendon Platform and Singleview. Understand the industries they serve.

• Practice Interview Questions: Prepare answers for common technical questions related to JavaScript, React, testing, and problem-solving. Practice discussing your portfolio projects and how they align with CSG's values and the role's requirements.

⚠️ 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.

---