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Added 11 mins ago
J
Manager of Projects (MOP)
Jacobs
Calgary, AB
- $168,600 to $221,325 USD / year
- Full-time
Added 11 mins ago
Dev. Machine Learning Engineering II
Bell
Toronto, ON
Design, implement, and maintain infrastructure-as-code (IaC) for ML applications, ensuring scalability, reliability, and maintainability.
Added 11 mins ago
MG
Principal Engineer / Architect
Matrix Global
Toronto, ON
- Full-time
We are seeking a highly skilled and hands-on Principal Engineer / Architect to lead the architecture, design, and delivery of next-generation cloud-native data and application platforms.…
Added 11 mins ago
MG
Java Engineer
Matrix Global
Toronto, ON
- Full-time
We are seeking a talented and motivated Java Engineer with strong experience in the Microsoft Azure ecosystem to join our growing engineering team. In this role, you will be responsible for…
Added 26 mins ago
JT
Product Development Engineer
jeans test
Engineer, BC
- Full-time
Provide technological and commercial contribution in activities relating to developing new applications and solutions to customers requirements. Conduct thorough technical feasibility…
Added 26 mins ago
L
Security Engineer
LiveKit
Canada
- Full-time
…production. Founded in 2021, LiveKit powers voice and agentic AI applications for OpenAI, Salesforce, Spotify, Meta, and tens of thousands of other developers, collectively facilitating…
Added 26 mins ago
B
Dev. Machine Learning Engineering II
Bell
Toronto, ON
- Full-time
Design, implement, and maintain infrastructure-as-code (IaC) for ML applications, ensuring scalability, reliability, and maintainability.
Added 26 mins ago
AW
Software Development Engineer II, AWS Identity - IAM Identity Center
Amazon Web Services (AWS)
Toronto, ON
- Full-time
…workforce and individual identities and manage their access to AWS applications and SaaS…
Added 40 mins ago
K
Senior Engineer, Software Design
Kinectrics
Toronto, ON
- Full-time
Professional Engineer (P.Eng.) designation in Ontario
Added 42 mins ago
UO
IUOE Millwright
University of British Columbia
Vancouver, BC · UBCV | University Services Building (USB)
- Full-time
Note: Applications will be accepted until 11:59 PM on the Posting End Date.
Added 56 mins ago
OC
Metallurgy Supervisor
Orano Canada
SK · Saskatchewan, Canada
- $134,550 to $158,300 CAD / year
- Full-time
A Bachelor’s degree in Chemical or Metallurgical Engineering and eligible for registration as a Professional Engineer with APEGS
Added 57 mins ago
Metallurgy Supervisor
Orano
SK · McClean Lake, Saskatchewan
A Bachelor’s degree in Chemical or Metallurgical Engineering and eligible for registration as a Professional Engineer with APEGS
Added 1 hour ago
C
Senior Software Engineer, Elixir
Clarity
Remote, Canada
- $150,000 to $275,000 CAD / year
- Full-time
- Remote
As a Senior Engineer at Hiive, you will be a hands-on contributor to the backed system powering our platform, while building a user friendly interface. You will collaborate with technical…
Added 1 hour ago
C
Senior Software Engineer
Clarity
Remote, Canada
- Full-time
- Remote
As a Senior Full Stack Engineer, you will be a hands-on contributor to the frontend and backend apps powering our platform. You will learn Elixir on the job from your colleagues and…
Added 1 hour ago
SI
Staff Cloud Security Engineer
Scribd, Inc.
Toronto, ON · Vancouver, BC
- Full-time
As a Staff Cloud Security Engineer, you'll help shape the technical direction of Cloud Security and drive complex architectural investments across our AWS and GCP environments. You'll work…
Added 1 hour ago
AI Engineer Intern (Masters)
Electronic Arts
Vancouver, BC
As a Software Engineer with expertise in AI/ML systems and platform development, you will help create a scalable AI Platform.
Added 1 hour ago
RB
Senior AI/ML Engineer
Royal Bank of Canada
Toronto, ON
- Full-time
Note: Applications will be accepted until 11:59 PM on the day prior to the application deadline date above
Added 1 hour ago
J
Manager of Projects (MOP)
Jacobs
Toronto, ON
- $168,600 to $221,325 USD / year
- Full-time
Added 1 hour ago
J
Manager of Projects (MOP)
Jacobs
Winnipeg, MB
- $168,600 to $221,325 USD / year
- Full-time
Added 1 hour ago
AC
Mechanical Engineer
Amaris Consulting | Part of Mantu
ON · Ontario, Canada
- Full-time
As a Mechanical Designer / Mechanical Engineer, you will contribute to the design, development, and improvement of mechanical systems and components. You will work closely with…
Added 1 hour ago
SF
Senior Consultant, Digital Analytics - Simplii Financial
Simplii Financial
Toronto, ON
- Full-time
Added 1 hour ago
S
Senior Mechanical Engineer
SYSTRA
Montreal, QC
- Full-time
SYSTRA Canada is looking for a mechanical engineer in systems integration to lead the integration and validation of mechanical systems for refurbished passenger cars. They will translate…
Added 1 hour ago
VM
QA Engineer
Vivid Machines
Toronto, ON
- Full-time
As an Intermediate QA Engineer, you will own the end-to-end Software Testing Life Cycle across our whole product: web applications, mobile apps, backend services, and the camera hardware…
Added 1 hour ago
J
Manager of Projects (MOP)
Jacobs
AB · Edmonton, AB
- $168,600 to $221,325 USD / year
- Full-time
Added 1 hour ago
UK
Utilities Engineer
Utilities Kingston
Kingston, ON
- Full-time
The Utilities Engineer leads the delivery of multi‑disciplinary capital projects within the water and wastewater utilities, including planning, design, and contract administration. The role…

Reactiv

Full Stack Developer (Junior/Intermediate)

Toronto, ON, M5A 1M3, Canada

Full-time

Apply About employer

Applications open in a new tab.

Job details

Job type: Full-time
Experience: ● Roughly 2 to 4 years of experience building web applications, or equivalent project
Posting language: English
Posted: Oct 6, 2026

Original job description

Full Stack Developer Junior / Intermediate

About Reactiv

Reactiv is an AI-powered platform that helps Shopify merchants build beautifully branded, high-converting mobile apps without the usual complexity. At the core of what we do is Reactiv Clips, a feature that removes the need for app downloads so brands can deliver fully customized app experiences instantly and without friction. By lowering the barrier to great mobile experiences, we're building the future of mobile commerce, and we're growing our engineering team to help shape what comes next.

About the Role

We're looking for a Junior to Intermediate Full Stack Developer to help build and improve the platform our merchants rely on every day, from the dashboard they use to design and manage their apps to the e-commerce APIs that power them. You'll ship real features from early on, with support and mentorship from our engineering team to help you grow. Most of your work will be in TypeScript across React on the frontend and Node.js on the backend, with the chance to go deeper on whichever side excites you most. This is a hands-on role for someone earlier in their career who wants to develop into a strong full stack engineer in a collaborative, hybrid environment. You don't need to check every box below; if you're solid on the fundamentals and eager to learn the rest, we want to hear from you.

What You'll Do

Build and maintain features across our merchant dashboard React and TypeScript) and our backend services and e-commerce APIs Node.js and TypeScript).
Write and consume RESTful and GraphQL APIs that connect our frontend experiences to server-side functionality.
Work with relational databases such as Postgres: designing simple schemas, writing queries, and learning optimization along the way.
Contribute to our Shopify integrations that keep merchant data in sync.
Collaborate with product, design, and other engineers to define, design, and ship new features.
Help keep the platform fast and reliable by improving performance and responsiveness on both sides of the stack.
Take part in code reviews, both giving and receiving feedback, as part of how we maintain quality.
Troubleshoot and fix issues across the stack to improve the experience for merchants.

What We're Looking For

Required

Working knowledge of React and a solid grasp of its core concepts.
Some experience building backend services or APIs with Node.js.
Comfortable writing TypeScript, or strong JavaScript with a willingness to pick up TypeScript quickly.
An understanding of how frontend and backend talk to each other: RESTful APIs, requests, responses, and error handling.
Familiarity with relational databases such as Postgres or MySQL.
Strong problem-solving instincts and eagerness to learn in a fast-moving, collaborative team.
Roughly 2 to 4 years of experience building web applications, or equivalent project and portfolio work.

Nice to Have

Experience with GraphQL.
Familiarity with the Shopify ecosystem, or an interest in ecommerce.
Exposure to AWS services Lambda, S3, RDS, DynamoDB or other cloud infrastructure.
Experience with a React framework such as Next.js or React Router (formerly Remix).
Experience writing automated tests Jest, React Testing Library, or integration tests).
Understanding of authorization concepts such as OAuth and JSON Web Tokens.
Familiarity with CI/CD practices.
Exposure to React Native, or interest in contributing to mobile.

Why Join Us

Mentorship and growth: You'll have regular code review, pairing, and support from experienced engineers, with a clear path from junior to intermediate and beyond.
Level up with AI We're constantly exploring how AI can make us better engineers, and you'll have real freedom to experiment with cutting-edge tools rather than wait for permission. It's a fast way to grow.
Real impact: The features you build are used by merchants running their businesses around the world.
Hybrid work environment: We believe in a hybrid model to create opportunities for intentional in-person collaboration (and mentorship) while balancing that with the deep focus time that comes from working remotely. You'll join the team in our Toronto office 2 to 3 days a week with the flexibility to work remotely the rest of the time.
You're an owner: Every engineer at Reactiv gets equity, so you share in the upside you help create. You're not just building the product, you own a piece of it.
Benefits from day one: Extended health and dental coverage that kicks in the day you start, no waiting period.
Unlimited PTO We take time off seriously here. Most of our engineers take around three weeks a year, and more when they need it, and we actively encourage stepping away to rest and protect against burnout.

How to Apply

Send your resume and any project links, portfolio, or GitHub profile to careers@reactiv.ai. A cover letter is optional, but we'd welcome a short note on why this role interests you.

Apply About employer

More about this job

Responsibilities

You will build and maintain features across the merchant dashboard and backend services using TypeScript, React, and Node.js. Additionally, you will collaborate with product and design teams to ship new features while ensuring platform performance and reliability.

Requirements

The role requires 2 to 4 years of experience with React, Node.js, and TypeScript, along with a solid understanding of RESTful APIs and relational databases. Strong problem-solving skills and an eagerness to learn in a collaborative, fast-moving environment are essential.

Skills

TypeScript
React
Node.js
Postgres
RESTful APIs
GraphQL
Shopify
JavaScript
AWS
Next.js
React Router
Jest
React Testing Library
OAuth
CI/CD

Benefits

Equity
Extended health coverage
Dental coverage
Unlimited PTO

Visa sponsorship

Not detected in the job text

Keywords

Full Stack Developer
TypeScript
React
Node.js
Shopify
RESTful APIs
GraphQL
Postgres
MySQL
AWS
Lambda
S3
RDS
DynamoDB
Next.js
React Router
Jest
React Testing Library
OAuth
JSON Web Tokens
CI/CD
React Native
Mobile Commerce
Engineering
Hybrid Work
Equity
Mentorship
AI
Web Applications
Software Development

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