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Added 1 month ago
VV
Java Full Stack Developer
Veracity Ventures Inc.
Toronto, ON
- $95,000 to $135,000 CAD / year
- Full-time
We are seeking an experienced and proactive Java Full-Stack Developer to design, build, and maintain scalable, cloud-native enterprise applications. In this role, you will work across the…
Added 1 month ago
E
Staff Engineer - MTS 2 (Integrations)
eBay
Toronto, ON
- Full-time
Familiarity with full-stack or web architecture
Added 2 months ago
C
Java Full Stack Development Lead
CGI
Toronto, ON
- Full-time
…we're still growing! Join Canada's largest IT Company as a "Java Full Stack Development Lead" in our Banking Services…
Added 1 month ago
C
Senior Software Engineering Specialist
CGI
Toronto, ON
- Full-time
Experience delivering backend, frontend, or full-stack software solutions.
Added 1 month ago
JG
Senior AI Engineer Java
J&M Group
Toronto, ON
- Full-time
…transformation initiatives by designing, building, and operating AI systems that enable end-to-end customer experiences, increase straight-through processing, and optimize the overall…
Added 1 month ago
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Software Developer, III
Verily
Waterloo, ON
- Full-time
Work closely with the development team to design, develop, and deliver new software features across the Verily tech stack.
Added 2 months ago
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Principal Quality Architect
Carbon60
Toronto, ON
- Full-time
…production features. The role blends test engineering with full-stack development: you'll help build the systems and the safeguards that prove they work. You'll apply agentic development…
Added 1 month ago
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Staff Software Engineer - Full Stack AI (Bangkok based, Relocation provided)
Agoda
Vancouver, BC
- Full-time
As our Staff Full Stack Engineer, you will design and build AI-driven chat experiences that power Agoda’s AI Assistant, trip planning and discovery, customer support flows, and proactive…
Added 1 month ago
DF
Full-Stack Automation Engineer
DUCA Financial Services Credit Union Ltd.
Toronto, ON
- Full-time
DUCA is looking for a Full-Stack Automation Engineer to join our growing team!
Added 1 month ago
C
Senior Platform Engineering Specialist
CGI
Toronto, ON
- Full-time
As a full-time member of CGI, you will become part of a collaborative team of architects, engineers, and consultants delivering enterprise technology solutions for some of Canada's leading…
Added 1 month ago
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Senior Data Platform Engineering Specialist
CGI
Toronto, ON
- Full-time
As a full-time member of CGI, you will become part of a collaborative team of architects, engineers, and consultants delivering enterprise technology solutions for some of Canada's leading…
Added 1 month ago
C
Senior Full Stack Developer
CGI
Toronto, ON
- Full-time
CGI is seeking an experienced Senior Full Stack Developer to join our growing Software Engineering Practice within the Emerging Technologies team.
Added 2 months ago
IC
Full Stack Developer
Infoya Career Connect
Vancouver, BC · Ottawa, ON · Toronto, ON · Waterloo, ON · Montreal, QC · ON
- $85,000 to $115,000 CAD / year
- Full-time
We are seeking a talented Full Stack Developer to design, develop, and maintain modern web applications. The ideal candidate will have experience building scalable frontend and backend…
Added 2 months ago
C
Senior Software Engineer
Clutch
Toronto, ON
- $160,000 to $200,000 USD / year
- Full-time
Continuously improve the systems, tools, and developer experience that power Clutch.
Added 1 month ago
VA
Member of Technical Staff - ML Operations
Veeda AI
Remote, Canada
- Full-time
- Remote
Full stack development experience with web-based front-end.
Added 2 months ago
PI
Technical Lead, Software
Palitronica Inc.
Waterloo, ON
- $100,000 to $140,000 CAD / year
- Full-time
7+ years of professional software development experience, including substantial backend and full-stack delivery experience, preferably using C++, C#, or Java.
Added 1 month ago
Sr. Manager, Engineering
Dialpad
Vancouver, BC
Full-stack fluency: a modern JavaScript framework (we use Vue 3 + TypeScript) and Python or Java on the backend.
Added 1 month ago
Senior Director, Engineering - Corporates, Financial Institutions & Sovereigns
Fitch Group
Toronto, ON
Full-stack engineering expertise - proven background with modern enterprise technology stacks, including React, Java, and/or Python in production environments, deployed across AWS and/or…
Added 2 months ago
C
Senior Software Engineer
Clutch
Toronto, ON
- $160,000 to $200,000 USD / year
- Full-time
Continuously improve the systems, tools, and developer experience that power Clutch.
Added 2 months ago
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Senior Software Engineer (AI & Full Stack)
Fable
Canada
- Full-time
Fable is looking for a highly motivated Senior Software Engineer with deep backend expertise, strong full-stack development skills, and hands-on experience building AI-powered applications…
Added 1 month ago
C
AI-Augmented Full-Stack Engineer - Vice President
Citi
Mississauga, ON
- Full-time
Full-Stack Design and Delivery: Design, develop, and deliver full-stack applications using Java and Spring Boot on the backend and Angular on the frontend, with meaningful input into…
Added 1 month ago
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Staff Software Engineer
Equifax
Toronto, ON · CAN - Ontario - Toronto
- Full-time
Lead the Architecture design and development of complex , scalable and resilient full-stack applications , with a primary focus on Java , Spring Boot, and modern front-end frameworks.
Added 4 months ago
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Frontend-Focused Full Stack Developer
ZTR
London, ON
- Full-time
As the Frontend-Focused Full Stack Developer, you will be collaborating with our Platform and Product Management teams to create engaging and best in class user experiences for our…
Added 1 month ago
CI
Senior Software Developer - Full Stack Web Application Development
CIeNET International
Markham, ON
- Full-time
Position: Senior Software Developer - Full Stack Web Application Development
Added 2 months ago
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Software Engineer, Full Stack
Gigi
Toronto, ON
- Full-time
You do not need to be an AI researcher or have years of professional LLM experience. Strong full stack engineers who are excited to learn how agentic systems work should apply. You'll use…

Gigi

Software Engineer, Full Stack

Toronto, ON, Canada

Base salary: $110k to $200k depending on experience level · Full-time

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Job details

Pay: Base salary: $110k to $200k depending on experience level
Job type: Full-time
Apply by: Feb 2, 2027
Posting language: English
Posted: Aug 6, 2026

Original job description

Gigi is the agentic operating system of enterprise media buying. Our first product is the AI media manager for Amazon DSP. Since launching it in summer 2025, we've grown to manage hundreds of millions in advertising spend on behalf of the largest agencies in the world.

We're backed by top venture investors Golden Ventures and Aperiam Ventures. Our founding team has spent 15+ years building in Amazon Ads and ecommerce, including a prior $100M+ exit.

We doubled revenue in the past two months. We expect to double again by early Q4.

We're hiring an AI Builder - a full stack software engineer - to join our engineering team in Toronto and own end-to-end feature development for Gigi, our AI agent.

This is still fundamentally a software engineering role. Much of the work will feel familiar: designing APIs, building interfaces, modelling data, integrating services, writing tests, debugging production issues, and making architectural decisions. The main difference is the product we're building: agentic software where LLMs reason, use tools, and take actions on behalf of customers.

You do not need to be an AI researcher or have years of professional LLM experience. Strong full stack engineers who are excited to learn how agentic systems work should apply. You'll use tools such as Codex, Claude Code, and Cursor as a core part of how you work, while building across agent logic, backend services, data, and the customer-facing product.

This is the 12th role at Gigi. As an early employee, you will have a meaningful role in shaping our product, engineering culture, and company.

What you'll do

Ship end to end. You'll own features from the data layer through the agent logic to the interface a media buyer actually touches. Our stack includes Python, FastAPI, LangGraph and LangChain; TypeScript, Vue and Nuxt; Java and Spring Boot; PostgreSQL, pgvector, Redis and NATS; and AWS.
Build with AI as a core part of your development workflow. Use Codex, Claude Code, Cursor, and other coding agents to help plan, implement, test, debug, and review software. You are still responsible for the architecture, quality, and correctness of what gets shipped.
Build the agent's judgment, not just its plumbing. Decide what Gigi should do autonomously and what it must escalate to a human, then score actions on risk and confidence so recommendations read differently when the data is thin.
Draw the line between probabilistic and deterministic work. LLMs for reasoning, structured software for execution. Knowing where that boundary sits on any given feature is a daily call, not a settled architecture.
Build reliable agentic systems. You'll learn to design tools, retrieval, memory, evaluations, guardrails, and human approval flows that make Gigi dependable enough to take action inside real advertising accounts. Prior experience with all of these is not expected.
Work directly with customers. You'll sit in on calls, read transcripts, and take feedback straight from the media buyers using the product. You'll turn ambiguous customer problems into shipped product without waiting for a perfect spec.

What success looks like

First 30 days. Your code is in production. You understand what a media buyer's day actually involves and why the product is shaped the way it is.
Six months. You own a surface area of the product outright. When something breaks in it, or a customer asks for something new, you're the person who decides what happens.
Twelve months. You've shipped something we could not have built without you, and you've thrown out at least one thing you built because the abstraction was wrong.

What you'll bring

A track record of building and shipping production software used by real customers. We care more about what you have built and owned than an exact number of years.
Strong full stack software engineering experience. The fundamentals you already have - system design, APIs, data models, interfaces, testing, debugging, and operating production software - transfer directly to this role.
Comfort across the stack. Real depth somewhere, no allergy to the parts you're weaker in.
Experience using, or a strong desire to become highly effective with, AI coding tools such as Codex, Claude Code, Cursor, or similar tools. You do not need to be an expert on day one, but you should be excited to use them every day - and strong enough technically to review their work, reject weak abstractions, catch missing edge cases, and remain accountable for what ships.
Curiosity about how LLMs change software products and the way software gets built. You should be excited to develop good judgment around where AI belongs - and where conventional software is the better answer.
Judgment over specification. You can make a reasoned call, ship it, and iterate fast when it's wrong.
Speed and ownership. LLMs changed what “fast” means for a small team. You should be comfortable using AI coding agents to move quickly while maintaining a high bar for architecture, correctness, and maintainability.

What you don't need

You do not need an AI research background or experience training foundation models. We build products around existing models, combining them with tools, data, business logic, interfaces, and production infrastructure.
You do not need prior experience with every agent framework or concept we use. We expect strong engineers to learn LangGraph, agent orchestration, evaluations, retrieval, and tool use on the job.
You do not need prior advertising or Amazon DSP experience. Our team will help you learn the domain.

Bonus points if

You've built with LLMs in production: evals, guardrails, tool use, retrieval, agent orchestration, cost and latency work.
You've worked in advertising or ecommerce.
You've built real-time data pipelines at meaningful volume, or been early enough at a startup to know what the first 20 people actually do.
You've operated production systems where correctness, permissions, auditability, or customer trust mattered.

The hard parts

We'd rather you know this before you apply.

We work hard. We are trying to build a generational company, and early employees should expect intensity, ambiguity, and high standards.
Cash compensation is competitive for our stage, but we will not win every late-stage salary comparison. The upside is meaningful ownership and equity in a company growing quickly.
We throw out working code when the underlying abstraction is wrong. Some of what you build will not survive, and you'll be the one who calls it.
Nobody is siloed. You'll write frontend, debug backend, think through product, join customer calls, and solve whatever problem is blocking the customer.

Compensation and Equity

Base salary: $110k to $200k depending on experience level
Meaningful equity. We want to be as generous with equity as possible, and top performers can expect equity top-ups early and often.

Life at Gigi

In-office culture. We work together downtown Toronto, but makers (i.e. engineers) can choose to work where they are most productive on Wednesdays.
Catered lunch every day from Toronto's best spots. Current rotation: Impact Kitchen, iQ Food Co., ChopHop, and Cumbrae's.
Real snacks: Greek yogurt, Mateína yerba mate, Barebells protein bars, Midday Squares. Tell us what you want and we'll add it.
Top-of-the-line Apple equipment.
Comprehensive health and dental coverage.

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More about this job

Responsibilities

Own end-to-end feature development for an AI agent, from the data layer and agent logic to the customer interface. Design reliable agentic systems including retrieval, memory, and guardrails while integrating directly with customer feedback.

Requirements

Requires a strong track record of shipping production software and proficiency in full stack engineering fundamentals. Candidates should be eager to use AI coding tools and possess the judgment to balance probabilistic LLM reasoning with deterministic software execution.

Skills

Full Stack Engineering
Python
FastAPI
TypeScript
Vue
Nuxt
Java
Spring Boot
PostgreSQL
Pgvector
Redis
NATS
AWS
LangGraph
LangChain
System Design

Benefits

Equity
Catered lunch
Health coverage
Dental coverage
Apple equipment

Visa sponsorship

Not detected in the job text

Keywords

LLM
AI Agent
Agentic Systems
Amazon DSP
Codex
Claude Code
Cursor
Python
FastAPI
LangGraph
LangChain
TypeScript
Vue
Nuxt
Java
Spring Boot
PostgreSQL
Pgvector
Redis
NATS
AWS
API Design
Data Modeling
Retrieval
Guardrails
Evals
Enterprise Media Buying
Ecommerce
Real-time Data Pipelines
System Design

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