High Five is hiring for a fast-growing AI marketing platform on a mission to help lean teams achieve outsized growth with less effort. The 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%.
The 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
We are 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
- Languages: Python and JavaScript (Node.js)
- 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
