Senior Full Stack Developer (Contractor)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Developer (Contractor) based in India.

This is a hands-on engineering role focused primarily on building intuitive, performant, and accessible digital <experiences.You> will take ownership of user-facing features from design handoff through deployment while contributing to backend development when needed.The role combines strong front-end expertise with practical experience across APIs and Ruby on Rails-based <services.You> will work closely with product managers, designers, and engineers to turn ideas into polished, scalable product experiences.Performance, accessibility, maintainability, and usability will be central to the work you <deliver.As> a senior contributor, you will also help establish engineering standards, review code, mentor teammates, and improve technical practices.The environment values ownership, thoughtful collaboration, continuous learning, and a strong user-first mindset.

Accountabilities

• Build, maintain, and improve user-facing features within a modern single-page application, taking ownership from design handoff through production deployment.
• Translate product requirements, user needs, and design mockups into clean, scalable, reusable, and maintainable front-end code.
• Develop primarily with JavaScript, HTML, CSS, and modern front-end frameworks, with the ability to work effectively across the stack when required.
• Collaborate closely with product managers, designers, and backend engineers to deliver high-quality features from concept through implementation.
• Contribute to backend logic and REST APIs within a Ruby on Rails environment when necessary.
• Maintain consistent implementation of design systems, UI patterns, and product standards across the application.
• Optimize applications for performance, responsiveness, reliability, and cross-browser compatibility.
• Write well-tested, maintainable code and participate actively in technical discussions and code reviews.
• Incorporate accessibility best practices and WCAG principles into front-end development to create inclusive user experiences.
• Identify and address technical debt, architectural limitations, and opportunities to improve front-end systems.
• Help establish front-end development standards, tooling practices, and technical guidelines.
• Mentor junior and mid-level engineers through constructive feedback, technical guidance, and code reviews.
• Investigate and resolve technical issues across the front end and, when appropriate, the backend.
• Stay current with emerging front-end technologies and apply relevant improvements to development practices and product capabilities.

Requirements

• 5+ years of professional experience in front-end or full stack software development.
• Strong proficiency in JavaScript, HTML, and CSS, with hands-on experience building single-page applications using a modern front-end framework.
• Experience with Svelte is advantageous, while strong experience with React, Vue, or a comparable framework is also relevant.
• Comfortable working with REST APIs and contributing to backend development when required.
• Experience with Ruby on Rails or another backend framework is a strong advantage.
• Strong understanding of front-end architecture, reusable components, responsive design, and application performance.
• Demonstrated ability to write clean, maintainable, and well-tested production code.
• Strong understanding of accessibility principles and experience incorporating WCAG or inclusive design practices into web applications.
• Strong attention to detail and a user-first approach to product development.
• Excellent communication skills and the ability to collaborate effectively with product, design, and engineering teams.
• Comfortable providing mentorship and constructive technical feedback to less experienced engineers.
• Ability to work independently, take ownership of deliverables, and make sound technical decisions.
• Experience with TypeScript is a plus.
• Familiarity with browser-side analytics tools such as Google Tag Manager or Amplitude is advantageous.
• Experience with testing frameworks such as RSpec and Jest is a plus.
• Experience in healthcare, mental health, regulated environments, startups, or scaling product teams is advantageous.

Benefits

• Contractor opportunity with a mission-driven digital product environment.
• Opportunity to work on user-facing products where usability, accessibility, and performance are highly valued.
• Significant ownership across the full feature development lifecycle, from design through deployment.
• Collaboration with product managers, designers, and experienced engineers across disciplines.
• Opportunity to influence front-end standards, architecture, tooling, and engineering practices.
• Mentorship opportunities and the ability to support the growth of other engineers.
• Exposure to modern front-end technologies, APIs, Ruby on Rails, analytics, testing, and accessibility practices.
• Opportunity to contribute to products focused on making modern mental wellness resources more accessible.
• Continuous learning and exposure to evolving technologies and development practices.