MIDDLE BACK-END ENGINEER (AI Chatbot & CRM Platform)

Your role & responsibilities

• Design and develop scalable RESTful APIs using NestJS for Chatbot, CRM, Automation, Billing, and Analytics modules.
• Architect and optimize MongoDB schemas for high-volume conversation and customer data.
• Build and maintain integrations with social platform APIs (Facebook Graph API, Zalo OA, TikTok, Instagram).
• Develop and optimize message processing pipelines (webhooks, queues, retry logic, rate limiting).
• Integrate AI/LLM services (OpenAI, Claude, Gemini) and manage conversation context handling.
• Implement caching strategies using Redis to improve performance and reduce latency.
• Work with RabbitMQ / queue systems to ensure reliable asynchronous processing.
• Monitor and optimize system performance (query indexing, load handling, memory usage).
• Participate in code reviews, architectural discussions, and technical improvements.
• Collaborate closely with Frontend, Mobile, AI, and Product teams in Agile/Scrum processes.

Your skills & qualifications

REQUIRED QUALIFICATIONS:

• 2–4 years of backend development experience.
• Strong proficiency in TypeScript and NestJS / Node.js.
• Hands-on experience with MongoDB, schema design, indexing, and performance optimization.
• Solid understanding of system design fundamentals (scalability, concurrency, caching, queue processing).
• Experience integrating third-party APIs and handling webhooks.
• Understanding of authentication, authorization (JWT, RBAC), and API security best practices.
• Familiar with Git, Docker, CI/CD workflows.
• Strong debugging skills and ability to work independently.
• Must have a personal laptop.

 

NICE TO HAVE:

• Experience with Redis, RabbitMQ, or event-driven architecture.
• Experience working with AI chatbot systems or LLM APIs.
• Knowledge of vector databases (Qdrant or similar).
• Experience deploying to cloud environments (AWS, GCP, Vultr).
• Exposure to PM2 clustering and production monitoring tools.

 

WHAT YOU’LL WORK ON:

• AI-powered multi-channel chatbot architecture.
• Real-time conversation processing systems.
• Credit-based billing engine and campaign automation.
• High-performance CRM data layer for millions of customer records.
• AI integration pipeline with LLM and vector search systems.

 

CAREER PATH:

• Senior Backend Engineer (12–24 months based on performance)
• Technical Specialist (AI / System Architecture)
• Back-end Team Lead

Benefits for you

WHY YOU’LL LOVE WORKING HERE:

• Competitive salary: 20 - 35M VND/month, based on experience.
• Performance bonuses & project-based incentives.
• Opportunity to work on AI-first SaaS architecture.
• Strong technical growth in scalable systems and AI integration.
• Fast-moving startup environment with real ownership.
• Participate in social insurance according to labor law, 13th month salary, birthday, company trip, annual leave, lunch allowance,...

 

WORKING TIME AND LOCATION:

• Working time: 9am - 6pm, Monday to Friday, lunch break from 12pm - 1pm.
• Location: 183/38 Ben Van Don, Khanh Hoi Ward, Ho Chi Minh City.