Senior Backend Engineer

High Five is hiring on behalf of our Client from Singapore - an AI-powered marketing agency alternative designed for Direct-to-Consumer (DTC) e-commerce brands.

As a Senior Backend Developer, you'll architect the backend systems that power our Client's AI marketing engine from the ground up… building intelligent, data-driven systems that help brands create thousands of high-performing campaigns with minimal human effort.

• Design, build, and deploy backend systems using modern software architecture practices and code that can be easily maintained and extended.
• Collaborate with experts to define our domain model and ensure clear separation of concerns through principles inspired by Domain-Driven Design and Onion Architecture.
• Collaborate with data and frontend engineers to design efficient interfaces and data flows.
• Ensure scalability, security, and performance in all production environments.
• Participate in code reviews, technical discussions, and architectural planning.

• Databases: SQL and No
  
  SQL systems such as Postgre
  
  SQL, Big Query, and Firestore
• Architecture:
  Strong understanding of system design, OOP, modular architectures, and clean layering, including DDD and Onion/Clean Architecture principles
• API Design:
  Experience with RESTful APIs, background jobs, durable execution, and event-driven or message-based patterns
• Data Handling:
  Ability to design and optimize complex data models, queries, and pipelines

• Familiarity with third-party API integrations such as Shopify, Facebook Ads, or Google Ads
• Experience with machine learning pipelines or model fine-tuning
• AI Agents:
  Experience with agentic frameworks, agent architectures, graph execution, evaluation, and user interface integration
• Experience working with Google Cloud Platform services such as Big Query, Pub/Sub, Redis, or Cloud Run

Work arrangement: Remote in Indonesia / Vietnam

Employment type: Full-time

We helps companies source, hire and pay tech talent in Southeast Asia - compliantly, without needing to set up a local entity. Our services include Talent sourcing, Employer and Agency of Record, and Global payroll. For job seekers, we open the door to a world of opportunities - connecting individuals with roles in other countries that allow them to maximize their unique skills and fulfill their potential.

We regret to inform that only shortlisted applicants will be notified. All applications will be treated with strictest confidence.