We are looking for a Senior Backend Engineer to build and evolve backend services that power the product. This is a hands-on individual contributor role focused on shipping high-quality backend code, improving existing systems and approaches, and taking responsibility for production behaviour.

Responsibilities
Backend feature development

• Design and implement backend features supporting core product experiences
• Take work from ideation through deployment and production support
• Design backend-first architecture used by mobile clients and internal services

AI-backed product functionality

• Integrate backend with LLM-powered and ML-based systems
• Handle latency, failure modes, and operational concerns around AI dependencies

System improvement and scaling

• Improve performance, scalability and reliability of existing backend services
• Work with relational databases: schemas, queries, migrations, and performance issues
• Collaborate closely with mobile, ML, and product managers to deliver features end-to-end

What we expect that you have
Must-have

• Strong backend engineering experience with Python (Django and/or FastAPI)
• Experience building and operating high-load backend systems
• Experience with asynchronous systems
• Good understanding of API design for backend ↔ client communication
• Solid experience with relational databases (PostgreSQL preferred)
• Strong execution and ownership mindset
• Fluent English

Nice to have

• Experience working with cloud infrastructure (AWS or equivalent)
• Experience working on AI- or ML-enabled products
• Experience with other languages (e.g. Go, Ruby)
• Interest in health, fitness, or consumer-facing products