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Added 1 min ago
Principal Cloud & AI Apps Solution Engineer
Microsoft
Toronto, ON
Full-time
…engagements, bringing deep expertise in application architecture, agent development, application modernization, and cloud-native…
Added 1 min ago
Stagiaire développeur IA & automatisation
Ericsson
Montreal, QC
Full-time
Évaluez quand utiliser l'automatisation traditionnelle, un service logiciel, un agent ou une combinaison d'approches.
Added 1 hour ago
Principal Research Scientist
ServiceNow
Montreal, QC
Full-time
Added 1 hour ago
Loss Prevention Store Security Agent
TJX Canada – Winners, Marshalls, HomeSense
Surrey, BC
$37,590 to $52,626 CAD / year
Full-time
We're seeking a Loss Prevention Store Security Agent to help create a safe, secure, and welcoming environment in our stores. In this impactful role, you’ll be instrumental in theft…
Added 2 hours ago
Senior Data Platform Developer - AI Platform
Geotab
Oakville, ON
Full-time
…and deliver results! Geotab is seeking a Senior Data Platform Developer who will be building the Geotab internal machine learning and generative AI platform. This role allows all Geotab…
Added 2 hours ago
Senior Data Platform Developer - AI Platform
Geotab
Toronto, ON
Full-time
…and deliver results! Geotab is seeking a Senior Data Platform Developer who will be building the Geotab internal machine learning and generative AI platform. This role allows all Geotab…
Added 2 hours ago
Senior Data Platform Developer - AI Platform
Geotab
Waterloo, ON
Full-time
…and deliver results! Geotab is seeking a Senior Data Platform Developer who will be building the Geotab internal machine learning and generative AI platform. This role allows all Geotab…
Added 2 hours ago
Sr Associate Machine Learning Engineer
Workday
Vancouver, BC · Canada, BC, Vancouver
Full-time
…that will revolutionize our customers' workday? Join the AI Agent Engineering team, where we're pioneering cutting-edge HR & Finance AI Agents that deeply integrate within the Workday…
Added 2 hours ago
Principal Engineer (API Platform)
Xero
Remote, Canada
Full-time · Remote
…and steward will serve as the trusted foundation for AI- and agent-driven automation across Xero’s accounting workflows; meaning you will be thinking not just about today’s developer…
Added 2 hours ago
Senior Software Engineer, AI Enablement
Xero
Vancouver, BC
Full-time
Developing guidance and best practice for authoring agent skills, including agents for remediation tasks
Added 3 hours ago
Manager, Internal Audit, Regulatory Compliance and Risk Management (Bilingual FR/EN)
PwC
Montreal, QC
Full-time
Added 3 hours ago
Data and Product Analyst (Contract)
PwC
Toronto, ON
Full-time
Added 3 hours ago
Senior ServiceNow Developer
Symbiotic Digital
ON · Cornwall East, Ontario
Contract
The Sr. Software Developer will design, implement, and
Added 3 hours ago
Senior Lifecycle Marketing Manager
VelocityEHS
Canada
Full-time
Lead the use of Marketo and 6sense email solutions, including the AI Email Agent (AIE), overseeing nurture programs, segmentation, personalization, automation, and standards for…
Added 3 hours ago
Senior Software Developer, Build Platform
Wealthsimple Technologies
Remote, Canada
$152,000 to $189,000 CAD / year
Full-time · Remote
As a Developer on our team, you won't just be building tools; you'll be shaping the entire developer journey at Wealthsimple. From their first day onboarding to their thousandth code…
Added 3 hours ago
Group Lead, AI Governance
Kraft Heinz
Toronto, ON
Full-time
Experience with cloud and identity controls, CI/CD, model/agent lifecycle management, observability, incident management, and production support (preferably Microsoft Azure)
Added 3 hours ago
Lead Analytics Solutions Developer
Enercare Inc.
Markham, ON
Full-time
The Lead Analytics Solutions Developer is the senior technical authority for how Enercare’s business data is modelled, defined and delivered for analysis. You will design the data…
Added 3 hours ago
Senior Data Integration Engineer
Connor, Clark & Lunn Financial Group Ltd.
Vancouver, BC
Enable real-time and event-driven data flows to support autonomous agent decision-making.
Added 3 hours ago
Senior Data Integration Engineer
Connor, Clark & Lunn Financial Group Ltd.
Toronto, ON
Enable real-time and event-driven data flows to support autonomous agent decision-making.
Added 4 hours ago
AI Solutions Engineer
Connor, Clark & Lunn Financial Group Ltd.
Vancouver, BC
Experience with agent frameworks (e.g., LangChain, LlamaIndex or equivalents), including tool use, orchestration, and multi-step flows
Added 4 hours ago
AI Solutions Engineer
Connor, Clark & Lunn Financial Group Ltd.
Toronto, ON
Experience with agent frameworks (e.g., LangChain, LlamaIndex or equivalents), including tool use, orchestration, and multi-step flows
Added 4 hours ago
Product Engineer
Insight Global
Toronto, ON
$150,000 to $180,000 CAD / year
Full-time
…including orchestration pipelines, evaluations, and LLM-based agent models - Experience working with agentic AI or orchestration frameworks such as LangChain, LangGraph, Mastra, or similar…
Added 4 hours ago
Allstate Sales Agent
Allstate Canada
Ottawa, ON
Full-time
As an Allstate Sales Agent, you’ll grow your own book of business, build strong relationships in your community, and help people protect what matters most. This is a hybrid role, where…
Added 4 hours ago
Staff Software Engineer (Fullstack, BE-leaning)
Apostra
ON · United Counties of Stormont, ON
Contract
In this role, you’ll be a technical leader responsible for the APIs, protocols, and agent interfaces that power our agentic advertising platform. You’ll design systems where AI agents are…
Added 4 hours ago
Loss Prevention Store Security Agent
The TJX Companies, Inc.
Mississauga, ON · Surrey, BC · CAN Home Office Mississauga ON
$37,590 to $52,626 CAD / year
Full-time
We're seeking a Loss Prevention Store Security Agent to help create a safe, secure, and welcoming environment in our stores. In this impactful role, you’ll be instrumental in theft…

Apostra

Staff Software Engineer (Fullstack, BE-leaning)

ON, Canada
United Counties of Stormont, ON, Canada

Pay: The salary range for this role is $180k-$230k USD / $190k-$245k CAD.
Job type: Contract
Apply by: Oct 29, 2026
Posting language: English
Posted: Sep 29, 2026

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Original job description

About Apostra

Apostra is defining a new future for advertising, for both humans and their agents.

Our founders helped build the technology that shaped advertising as we know it today. Now, we’re reimagining it from the ground up for a world of people and agents, with human intent at its heart.

We’re creating a place where advertisers, media owners and their agents can discover and act on every kind of media, opening up opportunities that have historically been fragmented and hard to access.

About The Role

We’re building the future of programmatic advertising through AI agents. Our technical team is creating the infrastructure that enables AI agents to discover, negotiate, and transact media inventory autonomously.

In this role, you’ll be a technical leader responsible for the APIs, protocols, and agent interfaces that power our agentic advertising platform. You’ll design systems where AI agents are first-class participants, with their own authentication, capabilities, and communication standards.

You’ll work at the intersection of advertising technology, distributed systems, and emerging AI agent frameworks - making architectural decisions that shape how our marketplace evolves.

This is a Fullstack (80/20 backend leaning), hands-on leadership role. You’ll write production code, prototype new agent communication patterns, review system designs, and mentor engineers while setting technical direction.

This isn’t a typical engineering role

We’re operating in a space without a fixed playbook, so this role is best suited for builders who are comfortable creating structure where none exists.
Our approach favors rapid experimentation over upfront perfection - we test, learn, and then formalize what works.
The pace is fast and often pushes beyond what feels comfortable. For the right person, that’s part of the appeal.
We’re also looking for engineers who are already actively exploring AI - this isn’t a “learn it on the job” environment.

Responsibilities

Design and architect scalable APIs for both human and AI agent clients
Lead development of agent interfaces, MCP servers, and A2A communication layers
Build and operate high-throughput systems for real-time advertising transactions
Evaluate and integrate emerging agent frameworks and protocols
Partner with product and design to define clear, agent-friendly API contracts
Drive architectural decisions around authentication, protocols, and transaction flows
Collaborate with external DSPs, SSPs, and agent platform partners
Mentor engineers on API design, distributed systems, and agent architectures
Anticipate and address edge cases in autonomous agent behavior

Qualifications

8+ years building distributed backend systems at scale
4+ years in a technical leadership role
4+ years working professionally within the AdTech ecosystem
Strong expertise in API design and architecture (REST, event-driven systems, auth, versioning)
Experience with AI agent frameworks and communication protocols, or the ability to rapidly learn and evaluate them
Proficiency with TypeScript/Node.js, React, and cloud platforms (GCP or AWS)
Experience designing systems for autonomous or semi-autonomous decision-making
Track record of mentoring engineers and fostering a collaborative team culture
Comfort working in fast-moving, evolving environments

Tech Stack

API Layer: TypeScript/Node.js, REST and event-driven services
Agent Interfaces: MCP servers and A2A protocol handlers
Data: PostgreSQL, BigQuery, Cloud Storage, Redis

As the agent ecosystem evolves, you’ll help evaluate new technologies and ensure our marketplace remains at the forefront.

Compensation

The salary range for this role is $180k-$230k USD / $190k-$245k CAD.

These ranges span multiple location-based salary bands across the US and Canada. Candidates are aligned to a narrower range based on geographic market compensation data specific to where they live, and final offers reflect demonstrated skills, experience, and role expectations.

Benefits & Perks

Details vary by location (USA/Canada), but all employees receive:

Health & wellness: Comprehensive medical, dental, and vision coverage with significant employer contribution; short- and long-term disability coverage; health savings/flexible spending options
Retirement: Employer-matched retirement savings plan (401(k) or RRSP)
Time off: Generous paid time off, statutory holidays, and year-end office closure
Parental leave: 13 weeks fully paid (eligibility requirements apply)
Remote work: Company-provided home office equipment, setup stipend, and access to WeWork spaces
Equity: Stock options

A Note To Applicants

We believe that all people are capable of great things. We encourage you to apply even if you do not meet all of the requirements that are listed within this job description.

Apply About employer

More about this job

Responsibilities

Design and build scalable APIs, agent interfaces, MCP servers, and A2A communication layers for an AI-powered programmatic advertising marketplace. Lead architectural decisions and production development, collaborate with advertising and platform partners, and mentor engineers on APIs, distributed systems, and agent architectures.

Requirements

Requires 8+ years building distributed backend systems at scale, 4+ years in technical leadership, and 4+ years of professional AdTech experience. Candidates should bring strong API architecture expertise, experience with AI agent frameworks or the ability to evaluate them quickly, proficiency in TypeScript/Node.js, React, and GCP or AWS, and a record of mentoring engineers.

Skills

Distributed Systems
Technical Leadership
API Design
TypeScript
Node.js
React
REST
Event-Driven Systems
Authentication
AI Agent Frameworks
MCP Servers
A2A Protocol
AdTech
Cloud Platforms
PostgreSQL
BigQuery

Benefits

Medical Insurance
Dental Insurance
Vision Insurance
Disability Coverage
Health Savings Account
Flexible Spending Account
Paid Time Off
Statutory Holidays
Year-End Office Closure
Paid Parental Leave
Home Office Equipment
Home Office Setup Stipend
WeWork Access
Stock Options

Visa sponsorship

Not detected in the job text

Keywords

Programmatic Advertising
AdTech
AI Agents
Distributed Systems
Scalable APIs
REST
Event-Driven Services
API Authentication
API Versioning
MCP Servers
A2A Protocol
TypeScript
Node.js
React
GCP
AWS
PostgreSQL
BigQuery
Cloud Storage
Redis
Real-Time Transactions
DSPs
SSPs
Agent Frameworks
Agent Communication Protocols
System Architecture
Technical Mentorship

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