Senior Backend Engineer

High Five; Indonesia; On-site; IDR 200.000.000 - 300.000.000; Full time

Job summary

A fast-growing AI marketing platform is seeking a Senior Backend Engineer to lead the backend systems' development. This role involves designing, building, and deploying scalable backend systems, ensuring optimal performance and security. The ideal candidate has proven experience with SQL and NoSQL databases, a strong grasp of modern architecture practices, and enjoys problem-solving in an evolving environment. Join a dynamic team in Indonesia and influence the project's direction significantly.

Qualifications

• Proven experience in building and deploying production-grade applications.
• Strong understanding of system design and architecture principles.
• Experience with RESTful APIs and event-driven patterns.

Responsibilities

• Design, build, and deploy backend systems using modern software architecture.
• Collaborate with data and frontend engineers to design efficient interfaces.
• Ensure scalability, security, and performance in production environments.

Skills

Ownership of projects

Problem-solving

Clean and maintainable code

Tools

PostgreSQL

BigQuery

Firestore

Job description

High Five is hiring on behalf of a fast-growing AI marketing platform. Our Client's product replaces the complexity of 10+ marketing tools, agencies, and freelancers with a single AI-powered system that becomes smarter every week. Brands using the platform achieve 177% growth within a year while reducing marketing costs by 62%.

Our company is scaling rapidly, with 50%+ demo-to-close conversion rates, and has raised $2.4M+ from reputable investors. The team is now expanding its infrastructure to support 10x growth.

*** This role will be the first senior backend hire outside the founding team, offering significant ownership and impact at a critical growth stage.

Who We’re Looking For

A Senior Backend Engineer with proven experience in building and deploying production‑grade applications from start to finish. You will have meaningful ownership of our backend systems, from architecture and design to development, deployment, and monitoring.

You’ll be a great fit if:

• You take full ownership of projects, understanding both the technical and business context while ensuring timely and reliable delivery.
• You are a proactive problem‑solver who thrives in uncertainty, identifies risks early, and takes initiative to move things forward.
• You value clean, testable, and maintainable code and believe good architecture makes teams faster and more effective.

What You’ll Do

• 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.

What We’re Looking For

Core Technical Skills

• Databases: SQL and NoSQL systems such as PostgreSQL, BigQuery, 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

Nice to Have

• 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 BigQuery, Pub/Sub, Redis, or Cloud Run

Who is High Five?

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.