As an early senior engineer on the project, you'll work on a greenfield product and have the opportunity to contribute across frontend, backend, and AI-powered features. You'll work directly with the client's technical founder and collaborate closely with the engineering team to turn ideas into reliable, production-ready solutions.
This is a hands-on opportunity for a strong Senior Fullstack Engineer who enjoys working independently, solving technical problems, and building modern products from the ground up.
What You'll Do
Build and maintain product features across frontend, backend, APIs, and data using React.js, TypeScript, Node.js, and PostgreSQL.
Develop AI-powered features using LLM APIs, including prompt design, tool/function calling, streaming, structured outputs, and error handling.
Build reliable AI workflows with a focus on quality, performance, scalability, and cost.
Contribute to application design and make practical technical decisions that support maintainability, performance, and scalability.
Work with a flexible AI/LLM integration approach, allowing different models or providers to be introduced as the product evolves.
Take features from technical implementation through production, balancing development speed with code quality and maintainability.
Use Claude Code and modern AI development tools as part of your day-to-day engineering workflow.
Work directly with the client's technical founder to clarify requirements, discuss technical solutions, and deliver high-quality features.
Participate in code reviews, technical discussions, and knowledge sharing, and help mentor junior engineers as the team grows.
Who We're Looking For
5–7+ years of professional software engineering experience, with strong fullstack experience.
Strong hands-on experience with React.js / TypeScript and Node.js / TypeScript.
Solid experience with PostgreSQL, database design, and backend/API development.
Experience building and maintaining production-grade web applications.
Hands-on experience integrating LLM APIs into real applications, beyond using AI tools for coding.
Practical experience with prompt design, tool/function calling, streaming, structured outputs, and LLM error/cost handling.
Understanding of how to integrate different AI models or providers in a maintainable way.
Experience using Claude Code or similar AI coding agents in your development workflow.
Comfortable working independently, breaking down requirements, troubleshooting problems, and taking ownership of assigned features.
Able to communicate technical solutions clearly and collaborate effectively with international stakeholders.
Strong spoken English and confidence participating in technical discussions.
Why Join Us
Greenfield product: Build a new AI product from the ground up instead of maintaining a legacy system.
Hands-on AI experience: Work on real AI-powered features and modern LLM technologies.
Real product ownership: Take ownership of meaningful features from development through production.
Global collaboration: Work directly with international technical leadership in an English-speaking environment.
Growth opportunity: Join early, work closely with experienced technical stakeholders, and grow with the product and engineering team.
What We Offer
Attractive and competitive performance-based compensation package.
Full gross salary during probation.
13th-month salary and dedication bonus.
Comprehensive healthcare insurance and annual health check-ups.
Flexible check-in time before 10:00 AM on weekdays.
2 days of remote work per week.
12 annual leave days, 5 sick leave days, public holidays in accordance with Vietnamese Labor Law, plus an additional Christmas day off.
Opportunity to work on global projects and international teams.
Daily breakfast and Happy Thursday gatherings.
Active sports and interest clubs, including badminton, running, football, and music.
Team-building activities, annual company trips, and year-end celebrations.
Continuous learning through technical and soft-skills training, English classes, and internal communities.
Financial support for important life events, including marriage, childbirth, and bereavement.
