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Added 26 days ago
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Field Service Engineer
Ecolab
Calgary, AB
- Full-time
Join CoolIT, an Ecolab Company, a global leader in Direct Liquid Cooling technology for data centers, supercomputers, and high-performance computing environments.
Added 26 days ago
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Architecte de données / Data Architect
Pratt & Whitney
Longueuil, QC
- Full-time
Added 26 days ago
Lead Software Engineer
Capgemini
Mississauga, ON
4. The software engineer builds skills and expertise of his or her software engineering discipline to reach standard software engineer skills expectations for the applicable role as defined…
Added 26 days ago
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Product Manager
Vasco
Remote, Canada
- Full-time
- Remote
…all the time. We structure CRM, billing, calls, and support data into a semantic layer where every metric is sourced, every definition is locked, and every answer is deterministic, then…
Added 26 days ago
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Professor, Part-Time
Seneca Polytechnic
Toronto, ON · North York, ON
- Part-time
Faculty/School School of Software Design & Data Science
Added 26 days ago
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Senior Aeronautical Structural Engineer
ITPS (Canada) LTD
London, ON
- Full-time
ITPS Canada is seeking an experienced Senior Aeronautical Structural Engineer to support the design, development, modification, and certification of aircraft and airborne systems across a…
Added 26 days ago
SG
Senior Solution Designer
SRA Group
NB · New Brunswick, Canada
- $85 to $90 CAD / hour
- Contract
Microsoft Certified: Azure Data Engineer Associate
Added 26 days ago
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Staff Optical Engineer
Nokia
Ottawa, ON · Kanata, ON
- Full-time
As a Staff Optical Design Verification Test (ODVT) Engineer, you will lead the comprehensive testing, validation, and performance characterization of the next generation of coherent…
Added 26 days ago
WI
Senior Electrical Engineer - Mission Critical & Data Centers
WSP in Canada
Toronto, ON
- Full-time
Join our Mission Critical & Data Centers team and help shape the future of digital infrastructure across Canada. As a Senior Electrical Engineer, you will provide technical leadership on…
Added 26 days ago
WI
Senior Electrical Engineer - Mission Critical & Data Centers
WSP in Canada
Ottawa, ON
- Full-time
Join our Mission Critical & Data Centers team and help shape the future of digital infrastructure across Canada. As a Senior Electrical Engineer, you will provide technical leadership on…
Added 26 days ago
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Full-Stack Software Engineer
Manulife
Toronto, ON · Waterloo, ON
- Full-time
…illustration experience. We are seeking a Full-Stack Software Engineer to join our Calculations Squad and develop capabilities that help advisors and customers make informed life insurance…
Added 26 days ago
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JREQ203081 Staff Software Engineer I (Open)
Thomson Reuters
Toronto, ON
- Full-time
The CoCounsel Agent Context team is seeking a Staff Software Engineer to set the technical direction for Content Tools - the purpose-built APIs that give AI agents precise, governed access…
Added 26 days ago
Senior Software Developer, Mobile (iOS), Platforms and Devices
Google
Waterloo, ON
…distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and mobile; the list goes on and is…
Added 26 days ago
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Staff Eng, API Design & Governance
eBay
Toronto, ON
- Full-time
We are hiring a Staff Engineer, API Design & Governance to help shape the architecture, quality, and long-term evolution of the systems and APIs that power these experiences. This is an…
Added 26 days ago
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Software Engineer II, Core Edge Processing
Marqeta
Remote, Canada
- Full-time
- Remote
As Marqeta's Software Engineer II on the Core Edge Processing team, you will write and ship production code at the heart of our processing systems, learning alongside senior engineers on a…
Added 26 days ago
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Staff Software Engineer - Core Edge Processing
Marqeta
Remote, Canada
- Full-time
- Remote
As Marqeta's Staff Software Engineer on the Core Edge Processing team, you will write and review production code at the heart of our processing systems, drive the initiatives that make them…
Added 26 days ago
FT
Lead Software Engineer
Franklin Templeton
Toronto, ON
- Full-time
Delivers reliable, SLA-driven data pipelines (holdings, transactions, positions)
Added 26 days ago
Software Engineer I
RAM Engineering Ltd.
Vancouver, BC
RAM is looking for a Software Engineer I to join our growing technology team. This is an excellent opportunity for an early-career Software Engineer who already has some professional…
Added 26 days ago
AC
Software Engineer (.NET / C# and AI/IoT)
Artelia Canada
Montreal, QC
- Full-time
As a Software Engineer (.NET / C# and AI/IoT) within the Telecommunications team, you will:
Added 26 days ago
Bilingual Data Engineer
CMHC - SCHL
Ottawa, ON · Montreal, QC
Join CMHC’s Information Technology team, in the Bilingual Data Engineer position. You will design, build and support reliable data pipelines and reusable data assets on Azure and…
Added 26 days ago
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Site Project Manager
Ecolab
Calgary, AB · CAN-Calgary Office Quarry Park
- Full-time
Join CoolIT, an Ecolab Company, a global leader in Direct Liquid Cooling technology for data centers, supercomputers, and high-performance computing environments.
Added 26 days ago
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Senior Full Stack Engineer, Customer & Cardholder Experiences
Marqeta
Remote, Canada
- Full-time
- Remote
We are looking for a Senior Full Stack Software Engineer to join our Customer & Cardholder Experiences team, delivering innovative UIs and embeddable solutions to transform the experience…
Added 26 days ago
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Technical Project Manager
Heidi
Remote, Canada
- $130,000 to $145,000 CAD / year
- Full-time
- Remote
…project plans in collaboration with Engineering and the Solutions Engineer, translating customer requirements and solution briefs into structured, executable delivery…
Added 26 days ago
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Intermediate Software Engineer (Agentic AI Verification)
Trulioo
Vancouver, BC
- Full-time
Reporting to the Senior Director, Engineering, the Intermediate Software Engineer will be responsible for building and hardening Trulioo's Agentic AI Verification capabilities, taking…
Added 26 days ago
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Full Stack Developer (Junior/Intermediate)
Reactiv
Toronto, ON
- Full-time
stack engineer in a collaborative, hybrid environment. You don't need to check every box

Reactiv

Full Stack Developer (Junior/Intermediate)

Toronto, ON, M5A 1M3, Canada

Full-time

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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.

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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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