Principal Frontend Engineer (ReactJS/AI)

Top 3 reasons to join us

• Hybrid working; Flexible time; Macbook Pro
• L&D programs; 17 days off
• 13.7 million B2C users; 140,000+ business customer

Job description

Job Description

We are looking for a frontend engineer to lead the development of our AI Agent platform/application from the ground up. The ideal candidate has experience building complex web applications, crafting intuitive user experiences, and collaborating effectively with cross-functional teams.

Responsibilities

• Lead frontend development of the AI Agent platform or application from scratch, ensuring high performance, responsiveness, and usability
• Design and implement complex UIs that interact seamlessly with backend APIs, real-time agent outputs, and developer toolchains
• Collaborate with design and product teams to translate user needs and business goals into elegant, scalable interfaces
• Introduce tools, frameworks, and development practices to improve frontend engineering efficiency and maintainability
• Mentor and support the growth of team members by helping them deepen their frontend expertise and best practices
• Take technical leadership across a cross-functional team—including frontend, backend, AI, and SRE engineers—and drive the overall development process

Your skills and experience

Requirements

• Technical
  • Must have
    • 5+ years of experience in web development
    • 3+ years of experience with React.js and TypeScript
    • Solid understanding of:
      • Modern frontend architecture and state management (e.g., Redux, Context API)
      • Component-based UI development and performance optimization
      • Frontend testing frameworks (e.g., Mocha or Jest)
      • Browser rendering behavior and accessibility best practices
    • Experience with:
      • Next.js and Webpack
      • Git-based development workflows
      • Docker and containerized development environments
      • Monitoring and debugging with tools like Datadog, Rollbar
      • Operating and maintaining frontend applications in production environments
      • Agile development processes
  • Nice to have
    • Experience with:
      • Integration with AI APIs (e.g., LLM-based outputs)
      • Reading or navigating Python (FastAPI) backend code
      • MySQL or basic relational database understanding
    • Practical knowledge in:
      • B2B SaaS product development, especially for back office domains
      • Collaborating with backend engineers on API design and integration
      • Performance profiling and web vitals monitoring
      • Infrastructure as Code (IaC) and CI/CD pipeline automation
• Communication
  • Experience leading a project as a team lead (required for Leader position)
  • Experience mentoring or educating team members
  • Strong sense of ownership and accountability
  • Business-level English (reading & writing)

Why you'll love working here

Caring Mental & Physical Recreation: 

• Hybrid working
• Full salary in probation & 13th month salary
• Social insurance on full salary from probation
• Premium Health insurance from probation
• Flexible start 8AM-9AM from Mon-Fri
• 16 days off annually + 1 Birthday Leave 
• Paternity leave extra 5 days 
• Annual company trip; Quarterly team building activities
• Club activities
• Annual health check

Caring Career & Development: 

• Clear Career path
• Foreign language & International technology-related certifications sponsoring
• Well-equipped facility: Macbook pro,  additional monitor,..
• Soft skill workshops
• Tech seminars
• Monthly and biannually Recognition Awards
• Performance review twice/year