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Added 2 months ago
G
Software Engineer, Full Stack
Gigi
Toronto, ON
- Full-time
…FastAPI, LangGraph and LangChain; TypeScript, Vue and Nuxt; Java and Spring Boot; PostgreSQL, pgvector, Redis and NATS; and…
Added 2 months ago
W
Software Engineer III/Senior Software Engineer (Full Stack)
Workday
Vancouver, BC
- Full-time
Exposure to additional programming languages like Java (backend) and TypeScript (frontend/fullstack) is a plus
Added 2 months ago
S
Backend Engineer – Data Ingestion & APIs, Kitchener, ON
Siemens
Kitchener, ON
- Full-time
Strong experience with backend development in Python, Go, Java, or similar languages.
Added 2 months ago
B
Développeur.euse Java / Java Developer
Bounteous
Montreal, QC
- Full-time
Nous sommes à la recherche de développeur.euse.s Java possédant de 3 à 15 ans d'expérience professionnelle pour se joindre à notre équipe hautement performante. Ce poste exige une solide…
Added 1 month ago
Java Developer
Capgemini
Montreal, QC
We're seeking a Java Engineer to join our Market Risk Technology team. In this role, you will develop and enhance the Market Risk Platform.
Added 1 month ago
IC
Engineering Standards, Lead
Interac Corp.
Toronto, ON · Interac Corp. Head Office
- Full-time
Evaluate and recommend shared Java backend libraries, build tooling, third-party frameworks, and backend platform practices that improve consistency, reliability, and developer productivity.
Added 1 month ago
C
Senior Java Developer – Vice President
Citi
Mississauga, ON
- Full-time
We are seeking a highly skilled and experienced Senior Java Engineer to join our dynamic team. The ideal candidate will be a hands-on developer with leadership quality, proficient in modern…
Added 1 month ago
E
Staff Engineer, API Design & Governance
eBay
Toronto, ON
- Full-time
eBay’s Developer Ecosystem team offers resources that help developers create solutions to make buying and selling on eBay faster and easier. The team builds and manages eBay’s Public APIs…
Added 1 month ago
T
Fullstack Engineer (Java)
TEKsystems
Toronto, ON
- $80 to $90 CAD / hour
- Contract
We are seeking an experienced Senior Full Stack Application Developer to join a dynamic technology team responsible for building and enhancing enterprise-level applications. This role is…
Added 1 month ago
CO
Staff Software Engineer
Capital One
Toronto, ON
- Full-time
Act as a tech lead developer owning technical design and development of cross-functional, multi-platform, fault tolerant application systems
Added 1 month ago
YI
Software Developer - Internal Automation
YuJa Inc.
Toronto, ON · North York, Ontario
- $80,000 to $90,000 CAD / year
- Full-time
We're looking for a Software Developer - Internal Tools who combines strong software engineering fundamentals with hands-on experience managing internal systems and infrastructure. In this…
Added 1 month ago
Senior Core Java Engineer
Capgemini
Montreal, QC
We are seeking a Senior Core Java Engineer to design, develop, and support high-performance, scalable enterprise applications. The ideal candidate will have strong expertise in Core Java,…
Added 1 month ago
DI
Spécialiste de l'intégration de données | Senior Integration Developer
Delmar International Inc.
Montreal, QC
- Full-time
Expérience en matière de développement de bases de données (Oracle), SQL et JavaScript, connaissance approfondie de Java, IIS et des services Web
Added 1 month ago
CN
Developer Student
Canadian Natural
Calgary, AB
- Full-time
As the Developer Student, you will maintain and develop application components to streamline business processes. Replate with “s a Developer Student, you will not only maintain and develop…
Added 1 month ago
GS
Senior Database Migration Engineer
Guidewire Software
Toronto, ON
- Full-time
Programming skills in one or more languages such as Java, Kotlin, C, or Go.
Added 2 months ago
C
Senior Software Developer – Machine Learning Platform
Coveo
Montreal, QC
- Full-time
5+ years of experience in backend development in a cloud environment (Python or Java/Spring preferred, AWS an asset)
Added 2 months ago
HT
Feature Software Developer
High Tech Genesis
Ottawa, ON
- Contract
High Tech Genesis is looking for a talented Software Developer to help develop new features and modernize applications used by organizations around the globe. You will join a large software…
Added 2 months ago
Amazon Connect/AWS Developer
Connex Telecommunications Inc.
Richmond Hill, ON
We are looking for an Amazon Connect / AWS Developer to design, build, and optimize cloud-based contact center solutions. This role focuses on developing Amazon Connect environments,…
Added 2 months ago
MarTech Developer
Konrad
Toronto, ON
As a MarTech Developer, you'll be tasked with working on a variety of client-facing marketing technology initiatives. Working within cross-functional project teams, your responsibilities…
Added 2 months ago
Senior IVR Developer
Connex Telecommunications Inc.
Richmond Hill, ON
We are seeking a Senior IVR Developer to join our Contact Centre and Customer Assistance team. This role will develop, enhance and support DTMF and conversational voice applications as part…
Added 1 month ago
Software Development Engineer, Early Career - 2026
Amazon
Vancouver, BC
- Experience with at least one general-purpose programming language such as Java, Python, C++, C#, Go, Rust, or TypeScript
Added 1 month ago
C
Java Full Stack Developer - Assistant Vice President
Citi
Mississauga, ON
- Full-time
Added 1 month ago
TS
Java Developer
Triunity Software
Quebec, QC
- $100,000 to $110,000 CAD / year
- Full-time
Triunity Software is looking for a talented Java Developer to join our growing team in Quebec, QC! This is an exciting opportunity to work on innovative software solutions in a…
Added 1 month ago
TS
Java Developer
Triunity Software
Toronto, ON
- $100,000 to $110,000 CAD / year
- Full-time
Triunity Software is looking for a talented Java Developer to join our growing team in Toronto, ON. This is an exciting opportunity to work on innovative software solutions in a…
Added 1 month ago
TS
Java Developer
Triunity Software
Ottawa, ON · Ontario, ON
- $100,000 to $110,000 CAD / year
- Full-time
Triunity Software is looking for a talented Java Developer to join our growing team in Toronto, ON. This is an exciting opportunity to work on cutting-edge software solutions in a…

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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