Backend Platform Engineer - Hapiko

Spin Master•Toronto, ON

9d•CA$136,700 - CA$182,300•Remote

About The Position

Hapiko, a Spin Master company, makes Stickerbox, a voice-activated sticker printer for children. This hands-on role owns the backend systems behind the product, including its real-time connection layer, API, job pipeline, and cloud infrastructure. The position will harden and scale existing foundations as the product grows globally, while keeping systems fast, safe for children, and affordable. The engineer will work closely with firmware, ML Serving, and Trust & Safety colleagues and share on-call responsibilities.

Requirements

Depth in Python and PostgreSQL.
Experience with Elixir or a genuine interest in learning it.
Experience owning production infrastructure end to end, rather than only writing code that runs on it.
Experience scaling a queue-driven or real-time system through an order of magnitude of traffic growth.
Comfort with being paged for systems you own and a commitment to reducing operational incidents.

Responsibilities

Own the API and job queues used for sticker requests.
Maintain the health and reliability of the real-time connection layer in partnership with the firmware engineer.
Tune and extend autoscaling to support holiday traffic spikes and a growing device fleet, partnering with the ML Serving engineer on GPU inference.
Improve observability through metrics, logs, tracing, and alerts.
Build cost instrumentation to track the costs of requests, models, and services.
Own release engineering for server-side services, including safe deployments, database migrations, and rapid rollback.
Partner with the Trust & Safety engineer on abuse prevention, device security, and privacy for a children's product.
Share on-call responsibilities and work to reduce the frequency of pages over time.