Senior Engineer – Build AI Execution Browser

Only for registered members Canada

5 hours ago

Default job background
$10,000 - $0 (USD) budget
Overview · We're building Pixis Browser — an execution-first AI browser. · This is NOT a chat browser or summarization tool. · It is a structured task execution runtime embedded inside a Chromium wrapper. · Pixis: · Takes a goal (e.g. "Cancel unused subscriptions") · Generates a ...
Job description
Overview

We're building Pixis Browser — an execution-first AI browser.

This is NOT a chat browser or summarization tool.
It is a structured task execution runtime embedded inside a Chromium wrapper.


Pixis:

  • Takes a goal (e.g. "Cancel unused subscriptions")
  • Generates a structured plan
  • Executes actions inside the browser via a controlled extension
  • Enforces approval gates for risky actions
  • Verifies completion deterministically
  • Logs everything for replay and regression testing
We are looking for a senior-level engineer to help build the core runtime and browser architecture.



Architecture (High-Level)

The system has three main components:
Electron Chromium Shell


  • Persistent user profile
  • Sidebar UI
  • Tab management
  • IPC bridge
  • Screenshot/highlight utilities
Chrome MV3 Extension


  • Extracts page perception (DOM + accessibility tree)
  • Generates stable element IDs
  • Executes strict typed actions (click/type/select/scroll)
  • Detects risk signals (captcha, login, checkout, payment)
Local Agent Runtime


  • Orchestrator state machine
  • Planner → PlanGraph
  • Executor loop (Perceive → Decide → Validate → Act → Verify → Recover)
  • Deterministic validators and verifiers
  • Approval system
  • Audit + replay harness
We already have a detailed technical PRD.



Scope of Work (Phase 1–2)


You will help build:

  • Electron browser shell with persistent profile

MV3 extension with:

  • DOM instrumentation
  • Action execution layer
  • Risk detection
  • Strict action schema + validation layer
  • Executor loop wiring
  • Approval gating logic
  • Trace logging system
  • Replay harness foundation
This is not a UI-only role.
This is a systems + architecture role.



Required Skills


  • Strong TypeScript
  • Electron (production experience preferred)
  • Chrome Extensions (MV3)
  • Playwright or browser automation experience
  • State machine / orchestrator experience
  • Experience building structured LLM systems (not just "chat UI")
  • Comfortable designing JSON schemas and strict contracts
  • Strong debugging + systems thinking


Bonus (Nice to Have)


  • Experience building AI agents
  • Deterministic validator/verifier design
  • Replay harness / test harness experience
  • Security-sensitive UI automation
  • Background in browser internals or Chromium
Contract duration of 1 to 3 months. with None hours per week.


Mandatory skills:
Python


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