Senior/Principal JavaScript Engineer (Node.js & React)

Principal JavaScript Engineer

Location: Vietnam

Workplace Type: Remote

About the Role

As a Principal JavaScript Engineer, you will work closely with Product, Design, and Engineering leadership to set technical direction, architect robust AI-first solutions, and deliver reliable, maintainable software. You will also play an important role in integrating AI in a thoughtful and pragmatic way across our products and internal workflows. This role offers a unique opportunity to shape the future of our technology and contribute to a dynamic and innovative team. You will be responsible for leading the development of high-quality, secure, and scalable engineering solutions, applying AI in practical and impactful ways to automate and enhance customer workflows, and building and operating systems capable of supporting advanced AI workloads at scale. Your expertise will be crucial in upholding strong engineering standards, including testing, code quality, and long-term maintainability.

Key Responsibilities

• Design and deliver high-quality, secure, and scalable engineering solutions.
• Apply AI in practical and impactful ways to automate and enhance customer workflows.
• Build and operate systems capable of supporting advanced AI workloads at scale.
• Uphold strong engineering standards, including testing, code quality, and long-term maintainability.
• Communicate clearly and collaborate across teams to ensure alignment and predictable delivery.
• Provide mentorship and technical leadership, helping elevate the broader engineering organization.
• Contribute to the architectural design and implementation of new features and services.
• Participate in code reviews and ensure adherence to coding standards.
• Troubleshoot and resolve complex technical issues.
• Stay up-to-date with the latest trends and technologies in JavaScript, AI, and cloud computing.

Required Skills & Qualifications

• 9+ years of full-stack engineering experience, including leading the delivery of complex systems.
• Be fluent in English communication skills (at least C1 level).
• Demonstrated success building and shipping production-grade applications in SaaS, B2B, FinTech, or similar environments.
• Hands-on experience developing and integrating AI-powered features such as LLM-based automation, classification, document processing, or workflow enhancements.
• Working knowledge of AI development and evaluation tools, including vector search, embeddings, prompt frameworks, or AI-assisted development tools.
• Strong proficiency in JavaScript and TypeScript.
• Solid experience with modern backend technologies (Node.js; NestJS is a plus) and frontend frameworks (React or Vue).
• Strong experience with relational databases (Postgres or MySQL), NoSQL databases (MongoDB), and ORMs such as TypeORM and Mongoose.
• Experience designing scalable architectures, APIs, and services with strong testing and observability practices.
• Good understanding of cloud platforms (AWS preferred), CI/CD pipelines, and DevOps fundamentals.
• Excellent communication skills and experience working closely with Product, Design, and QA teams.
• A proven history of mentoring engineers and improving engineering quality across teams.