Member of Technical Staff, Platform - Montreal - Onixai

    Onixai
    Onixai Montreal

    1 day ago

    Full time
    Description

    You will design and build the API that turns Onix into a platform.

    Onix is building Personal Intelligence: AI that belongs to you, protects your data, and connects you with real human expertise. Right now our apps talk to our backend. That works. But the vision is bigger. We need an API surface that our own products consume, that AI agents can interact with programmatically, and that external developers and partners can build on. You will design and own that surface.

    This is platform engineering, not just backend work. You are thinking about developer experience, versioning strategy, rate limiting, authentication patterns, and what the right abstraction layer looks like when your consumers range from a React Native app to an autonomous agent to a third‑party integration. You are building something that other people will build on. That requires a different kind of discipline than building endpoints for a single client.

    The agentic layer is what makes this especially interesting. AI agents need to call your API, chain actions together, handle partial failures, and operate without a human in the loop. Designing for that is a fundamentally different problem than designing for a traditional web client, and most API engineers have never had to do it.

    What You Will Do

    • Design and build the public and internal API surface for the Onix platform
    • Define API contracts, versioning strategy, authentication, and authorization patterns
    • Build endpoints optimized for agentic consumption: structured responses, predictable error handling, composable actions
    • Own API performance, reliability, and observability: latency budgets, monitoring, alerting, and documentation
    • Work with product and partnerships to define what capabilities we expose externally and how

    Who You Are

    You have designed APIs that other teams or companies depend on. Not just internal endpoints for a single frontend. APIs with versioning, deprecation policies, rate limits, and documentation that developers actually read. You understand that an API is a product, and you treat it with the same care you would treat a user interface.

    You think about the developer who will consume your API at 2am trying to ship their integration. You think about the AI agent that will call your endpoint a thousand times without a human checking the output. You build for both. You have opinions about REST versus GraphQL versus RPC, and you know when each is the right answer instead of defaulting to whatever the last company used.

    You have:

    • Experience designing and shipping APIs consumed by external developers or multiple independent clients
    • Strong backend skills in one or more of: , Go, Python, or Rust
    • Deep understanding of API design patterns: REST, GraphQL, gRPC, webhooks, and when each applies
    • Experience with authentication and authorization at the API level: OAuth, API keys, scoped permissions, token management
    • Familiarity with API infrastructure: gateways, rate limiting, caching layers, observability, and documentation tooling

    You are:

    • Obsessed with developer experience. You write APIs that are hard to misuse
    • A systems thinker who designs for the steady state, not just the happy path
    • Opinionated about API design but pragmatic about shipping. You know when perfect is the enemy of good
    • Curious about agentic workflows and how machines consume APIs differently than humans

    This Role is NOT For You If:

    • Your API experience is limited to building internal endpoints for a single frontend app
    • You think of documentation as someone else's job
    • You are not interested in the agentic and AI integration layer
    • You need a product manager to define every endpoint before you can start
    • You want a remote job

    What Success Looks Like

    • A versioned, documented API is live and consumed by our own apps, replacing ad hoc backend calls
    • External partners can integrate with Onix using your API without needing a Slack channel for support
    • AI agents interact with the platform reliably through structured, composable API endpoints
    • API uptime and latency meet the bar for a platform others depend on
    • The developer documentation is something you are proud to share publicly

    How to Apply

    Submit your application and answer:

    • Describe an API you designed that was consumed by external developers or multiple independent teams. What was the hardest design decision?
    • How would you design an API endpoint that needs to serve both a mobile app and an autonomous AI agent? What changes?
    • What is your approach to API versioning? When is breaking change acceptable, and how do you manage the transition?

    Onix announces Guillaume Mercier as Chief Operating Officer, bringing decades of executive leadership experience from BDC, Vention, SSENSE, and Cirque du Soleil.

    Every cycle in tech swings between centralization and decentralization. Cathedrals rise, but the bazaar always returns. Watch David's keynote on why Personal Intelligence is the future.

    Onix has been selected as a Top 100 AI Startup and will be featured at ALL IN Montreal.


    #J-18808-Ljbffr
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