Senior FE/Full Stack Engineer (JS, React,.NET)

About the Position

Senior FE/Full Stack Engineer (JS, React,.NET)

Svitla Systems Inc. is looking for a Senior Front End Engineer with.NET for a full-time position (40 hours per week) in Costa Rica/Mexico. Our client has multiple online platforms providing spiritual guidance on love, relationships, and life. They offer a vast portfolio of over 20 brands in the spiritual and emotional wellness space.

Responsibilities

• Design, develop, and maintain React and Next.js applications with a focus on performance, scalability, and maintainability.
• Collaborate with UI/UX designers to implement modern, responsive, and accessible interfaces.
• Build reusable front-end components and libraries for consistent design and faster development cycles.
• Work closely with backend engineers to integrate APIs and ensure seamless data flow.
• Apply best practices in state management, code organization, and testing.
• Optimize front-end performance, including load times, rendering efficiency, and accessibility.
• Participate in code reviews, mentoring, and knowledge sharing within the engineering team.
• Contribute to front-end architecture decisions, including tooling, frameworks, and standards.

Requirements

• 6+ years of professional experience in frontend application development.
• Experience with backend development in.NET.
• Strong knowledge of React JS and Next.js (server-side rendering, static site generation).
• Solid understanding of JavaScript/TypeScript, HTML5, and CSS3.
• Experience with state management libraries (Redux, Zustand, Recoil, or similar).
• Familiarity and background in consuming RESTful APIs.
• Knowledge of responsive design, accessibility (a11y), and cross-browser compatibility.
• Experience with agentic AI development, utilizing tools such as Claude, Copilot, and Cursor.
• Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent technical experience.
• Strong problem-solving, communication, and collaboration skills.

We Offer

• US and EU projects based on advanced technologies.
• Competitive compensation based on skills and experience.
• Regular performance appraisals to support your growth.
• Flexibility in workspace, either remote or our welcoming office.
• Bonuses for article writing, public talks, other activities.
• Generous time off, including vacation, national holidays, sick leaves, and family days.
• Personalized learning programs tailored to your interests and skill development.
• Free tech webinars and meetups organized by Svitla.
• Regular corporate online activities.
• Awesome team and a friendly, supportive community!

Why Join Svitla

Svitla Systems is a global digital solutions company headquartered in the U.S. and operating across the Americas, Europe, Asia, and APAC. Since 2003, we have served a wide range of clients - from innovative start-ups to Fortune 500 companies. Our success is built on partnership. By integrating seamlessly with clients' teams, we create lasting collaborations that drive real results. We are strong advocates of workplace flexibility, remote culture, individual approach to professional and personal growth.

Our global mission is to build a business that contributes to wellbeing of our partners, personnel, and their families, improves our communities, and makes a lasting difference in the world. Together, we are coding a brighter tomorrow - and living it.

Join us!

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