WHO WE ARE:
We are looking for an AI Fullstack Engineer who specializes in integrating LLMs into production systems
You will work on product engineering, leveraging existing AI platforms (OpenAI, Azure OpenAI, Microsoft AI services…) to deliver scalable, production-ready solutions.
WHAT WE DO
At Sun Asterisk, we build cutting-edge AI solutions that leverage the power of LLMs and modern AI platforms to drive innovation, transform industries, and empower businesses worldwide.
As an AI Fullstack Engineer, you will:
Design, develop, and maintain backend systems (preferably using TypeScript or other popular programming languages) and frontend applications using React, Next.js, or equivalent frameworks
Build and maintain backend services and APIs (tRPC, REST, GraphQL or similar)
Integrate LLM-based features using OpenAI / Azure OpenAI / MS AI APIs
Apply Prompt Engineering techniques to optimize response quality, consistency, and cost
Design and implement RAG systems by connecting internal data sources to LLMs
Work with vector databases and embeddings to support semantic search and AI-powered workflows
Collaborate closely with Design, AI stakeholders to deliver end-to-end features
Optimize database schemas and queries using PostgreSQL and modern ORM/query builders
Ensure code quality through code reviews, testing, logging, and monitoring
Continuously learn and experiment with new AI capabilities and apply them to product improvements
WHO YOU ARE
#Experience Requirements
Mandatory Skills:
3+ years of experience as a Fullstack, Backend, or Frontend Engineer
Strong proficiency in TypeScript or experience with Node.js / Python / Golang
Experience building production applications with React and/or Next.js
Solid experience designing and consuming backend APIs (REST, GraphQL, tRPC, etc.)
Hands-on experience integrating LLMs into applications (OpenAI, Azure OpenAI, or similar)
Good understanding of:
How LLMs work at a conceptual level
Prompt Engineering in real use cases
Practical experience with RAG or similar LLM-data integration patterns
Familiarity with vector databases / embeddings
Experience working with PostgreSQL and performance optimization
Collaborative mindset, product thinking, and strong ownership.
Desired Skills:
Experience with AI agents or multi-step AI workflows..
Familiarity with Tailwind CSS, Zod, Vercel, serverless or edge architectures
Experience building AI-powered SaaS or internal platforms
Awareness of cost, latency, and reliability considerations in AI integration.
#Skill requirements
Excellent English communication skills
Outstanding teamwork abilities
Proven ability to prioritize and allocate work
Sharp critical thinking and logical reasoning
Effective problem-solving skills
#Attitude Requirements
Customer-centric mindset
Adaptability to change
Commitment to continuous learning and growth
BENEFITS AND PERKS
Professional, open-minded, and creative environment:
Work with colleagues who embrace ideas to change the society
Respect different perspectives within a team
Strong learning culture that promotes individual development
The culture of taking risks to experience and thrive
Focus on individual development:
Be consulted, accompanied, and supported in career development with the career path system (developing in expertise or management direction) that has been studied and tested for many years.
Be oriented for individual, group, and organizational goals
Be empowered
Be supported to define a 3-month or 6-month goal (Goal Define Support)
Get access to company Learning Hub online library with various courses provided by Udemy, LinkedIn,…
Special care for employees:
Salary: Negotiable + competitive allowance (lunch, living allowance, beauty care, Japanese and IT certificates, etc.)
13th-month salary bonus
Performance review: Twice/a year
Hybrid working policy; flexible check-in, check-out
Comprehensive health insurance Sun* Care
Seniority Allowance
Women care allowance: Women’s physiological leave: 2.5 hours/month; Postpartum leave for female employees with under 1-year-old children: 1 hour/day
Policies supporting learning activities, knowledge sharing, and cultural exchange (Technology Seminar – Tech Expert, Club: Reading, Japanese, Music Club, …)
Annual company trip and quarterly team-building activities
Note: By applying for this position, you consent to Sun* collecting, storing, and processing your personal data for current and future recruitment purposes. Your data may be shared with relevant parties involved in the recruitment process and will be retained indefinitely until you submit an official written request for its deletion.