Principal Backend Engineer (Python)

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

We are looking for a backend engineer to lead the development of our AI Agent platform/application from the ground up. The ideal candidate has experience designing scalable systems, integrating with complex toolchains, and driving cross-functional teams with strong technical leadership.

Responsibilities

• Lead backend development of the AI Agent platform or application from scratch, handling large-scale user data and system logs
• Design and build complex system architectures that integrate with internal/external APIs, vector databases, and various developer toolchains
• Monitor system behavior proactively and respond swiftly to abnormal agent behavior or system failures
• Introduce tools, systems, and development culture to improve engineering efficiency and team collaboration
• Mentor and support the growth of team members by helping them develop strong technical fundamentals
• Take technical leadership across a cross-functional team—including backend, frontend, AI, and SRE engineers—and drive the overall development process

Your skills and experience

Must have

• 5+ years for Web development
• 3+ years of experience with Python (or Golang as an alternative)
• Solid understanding of:
  • Frontend development (e.g., TypeScript, React)
  • Cloud infrastructure (e.g., AWS, Azure, Terraform, serverless architecture)
  • AI system integration (e.g., working with LLM APIs, embedding, vector DBs
• Experience with:
  • Type hinting and static analysis using mypy
  • Unit testing using pytest
  • Code quality tools: black, flake8, isort, bandit
  • Docker and containerized development
  • Operating and maintaining applications in a production environment
  • Application performance tuning
  • Agile development processes

Nice to have

• Experience with:
  • Django (web framework)
  • Celery (asynchronous task processing with Amazon SQS or other brokers)
  • Graphene (GraphQL library with code-first approach)
• Practical knowledge in:
  • Container Orchestration (e.g., Kubernetes, Kustomize)
  • Frontend architecture design or collaboration with frontend engineers
  • Integrating LLMs into production applications (e.g., prompt management, RAG pipeline, evaluation tools)
  • Infrastructure as Code (IaC) and CI/CD pipeline automation
  • Experience in B2B application development
• 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

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