WHAT DOES A JAVASCRIPT DEVELOPER DO?
Published: Nov 19, 2025 - The JavaScript Developer is responsible for delivering project requirements and designing the core architecture of software applications. This role involves developing user-facing features, optimizing performance and scalability, and ensuring UI/UX designs are technically feasible. The developer also collaborates across departments, implements data storage solutions, and evaluates open-source libraries for integration into future projects.
A Review of Professional Skills and Functions for JavaScript Developer
1. JavaScript Developer Overview
- Web Development: Deliver high-quality web front-end and back-end code.
- Performance Analysis: Anticipate potential bottlenecks.
- Server Management: Create servers and databases for functionality.
- Communication Skills: Report to the team or directly to the customer.
- Self-Management: Responsible for being proactive, independent, and solution-oriented.
- Architecture Collaboration: Participate in architectural discussions with clients.
- Estimation Leadership: Responsible for driving the estimation process.
- Technology Awareness: Stay plugged into emerging technologies/industry trends and apply them to the day-to-day activities of the team.
- Process Improvement: Review and enhance team processes and outputs.
- API Development: Responsible for designing and developing APIs.
2. JavaScript Developer Tasks
- Security Management: Responsible for making security the top priority.
- JavaScript Coding: Responsible for code using Vanilla JavaScript (ES6+).
- Library Utilization: Identify and leverage vanilla JavaScript libraries for common problems.
- Cross-Functional Collaboration: Collaborate with cross-functional teams to architect, design, document and implement quality solutions.
- Test Automation: Design and implement automated unit and functional tests.
- System Design: Design and implement solutions for availability, scalability, and performance.
- Issue Resolution: Responsible for troubleshooting and fixing issues.
- Code Review: Perform code reviews and mentor team members.
- Team Collaboration: Collaborate and pair with multiple teams to share knowledge and improve everyone’s skills.
- Process Documentation: Define and document processes and analyses.
3. JavaScript Developer Responsibilities
- React Development: Develop the latest user-facing features using React.js.
- UI Design: Design a modern, highly responsive web-based user interface.
- Component Engineering: Build reusable components and front-end libraries for future use.
- Code Translation: Translate designs and wireframes into high-quality code.
- User Interaction Analysis: Learn and understand user interactions.
- Performance Optimization: Optimize components for maximum performance across a vast array of web-capable devices and browsers.
- Team Coordination: Coordinate with various teams working on distinct layers.
- Project Involvement: Involved from conception to completion with projects that are technologically sound and aesthetically impressive.
4. JavaScript Developer Duties
- React Native Development: Develop React Native applications for both iOS and Android.
- Native Integration: Leverage native APIs for deep integrations with both platforms.
- UI Module Creation: Create UI screens and modules in both iOS and Android and integrate with the React Native application.
- Performance Debugging: Diagnose and fix bugs and performance bottlenecks for performance that feels native.
- Software Development: Create software code, unit tests and assist with encoding, testing, debugging, and documentation.
- Technical Feasibility Review: Review requirements, wireframes, and designs for technical feasibility.
- User Story Translation: Work with the scrum team to translate these into user stories that can be implemented.
- Quality Assurance: Improve product quality through code reviews, writing effective unit tests, and collaborating with QA to implement automation testing.
- Backend Collaboration: Work closely with the backend team for the product’s admin setup.
5. JavaScript Developer Duties and Roles
- Front-End Innovation: Contribute ideas through knowledge of evolving front-end technologies.
- Best Practices Adoption: Use industry best practices of development processes and tools, and adopt and improve them.
- Interface Development: Create and maintain modern interfaces according to unit standards.
- Code Quality: Follow and improve code quality standards.
- Estimation Analysis: Responsible for analyzing and estimating.
- UI Feasibility Assessment: Perform technical assessment of UI mockups/wireframes to ensure the possibility of their implementation within a reasonable time.
- Software Design: Responsible for software design.
- Solution Documentation: Create and review software feature design documents and provide the solution.
6. JavaScript Developer Key Accountabilities
- Architecture Leadership: Responsible for ensuring the development and delivery of requirements, designing the underlying architecture of software projects.
- Feature Development: Develop new user-facing features.
- Code Reusability: Build reusable code and libraries for future use.
- UI/UX Feasibility: Ensure the technical feasibility of UI/UX designs.
- Cross-Department Collaboration: Liaise with other departments and leadership to develop requirements (Data&AI, UI/UX, etc).
- Performance Optimization: Optimize the application for maximum speed and scalability.
- Data Storage Design: Design and implementation of data storage solutions.
- Open-Source Research: Research the use of open-source packages and libraries.
7. JavaScript Developer Role Purpose
- UI Development: Build internal user interfaces for the team as well as clients.
- Automation Engineering: Build Typescript and NodeJS scripts and scheduled tasks that automate 99% of the rest of the team's manual work.
- Deployment Management: Create deployment procedures to support rapid development, continuous improvement and data confidence.
- Performance Engineering: Solve problems around load, efficiency and power when it comes to running complex queries and processing data.
- Database Design: Design MySQL database structures and analyze data to help draw conclusions and make data-driven decisions.
- Team Collaboration: Join a tight-knit development team focused on building products for the Salesforce.com ecosystem.
- Application Enhancement: Work together to improve web and mobile applications using AngularJS, React, and other JavaScript technologies.
- Technical Solutions: Provide mission-critical technical solutions used by Fortune 100 companies.
8. JavaScript Developer Essential Functions
- Agile Development: Participate in agile-based software development life cycle, including technical analysis, documentation, development, testing and code reviews.
- Release Coordination: Collaborate with the production team for the release and maintenance of the components.
- Development Practices: Work closely with the other developers in determining and following best development and architecture practices.
- Requirements Analysis: Actively participate in requirements and design meetings for new functionalities.
- Architecture Feedback: Provide and propose feedback about architecture, design, technology, and the technology direction of the platform.
- UI Engineering: Design and develop rich user interfaces for mission-critical applications using JavaScript, PHP, and other front-end technologies.
- UX Collaboration: Participate in user experience design, architecture initiatives, and code reviews with a major focus on ease of use, reusability, performance, and developmental efficiency.
- Team Support: Work as a member of a team, helping the team respond quickly and effectively to business/project needs.