Jobs / engineering
Senior Backend Engineer, Toqi (AI Life Assistant)
Prosus · Amsterdam
IND sponsor
What you will do
As a Senior Backend Engineer you own services end to end — design, implementation, deployment, monitoring and the pager. Anything that changes an API contract, a database schema or a cost profile gets a short design note circulated before the code is written. Judgement calls on data modelling, failure modes and where to spend the latency budget sit with you rather than being escalated by default.
Seniority here is measured in what the rest of the team can rely on. You review backend pull requests with the same care you expect on your own, leave the codebase more legible than you found it, and raise trade-offs early — where a product request would cost more in reliability, inference spend or long-term maintenance than it returns, we want that argued rather than absorbed quietly.
Seniority here is measured in what the rest of the team can rely on. You review backend pull requests with the same care you expect on your own, leave the codebase more legible than you found it, and raise trade-offs early — where a product request would cost more in reliability, inference spend or long-term maintenance than it returns, we want that argued rather than absorbed quietly.
What you will do
• Design, build and maintain REST and WebSocket endpoints serving the mobile app and WhatsApp surface
• Own domain models, repository interfaces, and database migrations
• Add new handlers and services as product features require
• Define and version shared API contracts (protobuf) consumed by the client
• Maintain authentication, authorisation and session handling
• Enforce rate limits, quotas and abuse protection
• Instrument services: structured logging, metrics, tracing and useful alerts
• Keep linters, formatting, and tests passing
• Own domain models, repository interfaces, and database migrations
• Add new handlers and services as product features require
• Define and version shared API contracts (protobuf) consumed by the client
• Maintain authentication, authorisation and session handling
• Enforce rate limits, quotas and abuse protection
• Instrument services: structured logging, metrics, tracing and useful alerts
• Keep linters, formatting, and tests passing